Oklahoma AgWeather Overview
The weather data and products on Oklahoma AgWeather are a product of the Oklahoma Mesonet. All weather data are updated every 15 minutes, except for a few specialized agricultural products and forecasts. There is a 20-40 minute lag time between when the data are recorded at the tower and time when it is reported via the Internet. The lag time varies based on when the Web pages are accessed.
Weather data collected at the tower locations is transmitted via a radio network to nearby law enforcement offices. From these offices, it is sent by wired network connections to computers located at the Oklahoma Climatological Survey office on the University of Oklahoma campus. data are reviewed for quality assurance, converted from metric to English units, and then updated on the Oklahoma Mesonet Web servers.
Every effort is made to provide Oklahoma Mesonet weather data and products 24 hours a day, 365 days a year. Data flow may be interrupted due to power outages, unique weather events, or solar activity that disrupts radio communications. Data not currently displayed over the Web is collected at a later time and included in Oklahoma Mesonet archive and summary products.
Quick links
Product Information
Cattle Stress Index Info sheet (pdf)
Degree Day Calculator
Evapotranspiration Product Description (pdf)
Evapotranspiration
Agronomic Crop Info Sheet (pdf)
Evapotranspiration Info Sheet for Homeowners (pdf)
Evapotranspiration Info
Sheet for Commercial Horticulture Crops (pdf)
Frozen Precipitation Events
Heat Index
Mesonet and Weather Fronts Info Sheet (pdf)
Microsoft Internet Explorer Compatibility
Netscape Browser Compatibility
Operating System Compatibility
OSU Cooperative Extension Service
Printing Graphics or Chart
Radar
Radar Use Info Sheet (pdf)
Saving Graphs or Charts
Solar Radiation or Sunlight
Station Locations
Support
Variables Measured
Wheat - Number of Days GDD>0
Wheat First Hollow Stem
Wind Barbs
Wind Chill Index
WxScope Plugin Downloading and Installation
WxScope Plugin Downloading and Use Info Sheet (pdf)
The weather data and products on Oklahoma AgWeather are a product of the Oklahoma Mesonet. All weather data are updated every 15 minutes, except for a few specialized agricultural products and forecasts. There is a 20-40 minute lag time between when the data are recorded at the tower and time when it is reported via the Internet. The lag time varies based on when the Web pages are accessed.
Weather data collected at the tower locations is transmitted via a radio network to nearby law enforcement offices. From these offices, it is sent by wired network connections to computers located at the Oklahoma Climatological Survey office on the University of Oklahoma campus. data are reviewed for quality assurance, converted from metric to English units, and then updated on the Oklahoma Mesonet Web servers.
Every effort is made to provide Oklahoma Mesonet weather data and products 24 hours a day, 365 days a year. Data flow may be interrupted due to power outages, unique weather events, or solar activity that disrupts radio communications. Data not currently displayed over the Web is collected at a later time and included in Oklahoma Mesonet archive and summary products.
Degree-day units were developed as a tool to measure the heat units that drive plant growth and insect development. Degree-day models provide agricultural producers and crop consultants a way to estimate the variation in crop growth and pest development, based on recent weather conditions.
Each crop or insect has a unique lower and upper air temperature threshold. It is assumed that no growth occurs outside of this range. The temperature range will be lower for crops or insects that grow best in cool air temperatures and higher for those needing more heat for growth. For example, wheat has a lower temperature threshold of 32°F and an upper temperature threshold of 86°F. Cotton, a crop that needs much warmer weather for plant growth, has a lower temperature threshold of 60°F and an upper temperature threshold of 100°F.
Degree-day units are calculated for each day and the daily units added together to give a degree-day accumulation from a Start Date. For most crops, the Start Date will be the planting date.
The Oklahoma Mesonet Degree-day Calculator defaults to the current date for both the Start and End Dates. The calculated degree-day units for each station are shown on a zoomable, color-contoured Oklahoma map. The number shown is the accumulated degree-day units from the user selected Start Date. The legend to the right of the map shows the range of accumulative degree-day units from high to low for the Start and End Dates selected and the corresponding color.
Calculation and display of degree-day data is slower than other Oklahoma Mesonet data products. If no data appears, be sure that the most current WxScope Plugin version has been loaded.
The Oklahoma Mesonet uses the "Cutoff Method" to calculate degree-day values, based on the following formula:
Degree-days = (Maximum Daily Air Temp + Minimum Daily Air Temp)/2 - Base Temp
where, the Base Temp is equal to the crop's lower temperature threshold.
When the maximum daily air temperature is above a crop's upper temperature threshold, the maximum daily air temperature is set to the upper temperature threshold. When the degree-day value is negative, the degree-day value is set to zero.
The following are the lower and upper temperature thresholds for agronomic crops listed on the Oklahoma Mesonet AgWeather web site.
| Crop | Lower Temperature Threshold | Upper Temperature Threshold |
| Alfalfa | 41°F (5°C) | 86°F (30°C) |
| Corn | 50°F (10°C) | 86°F (30°C) |
| Cotton | 60°F (15.6°C) | 100°F (37.8°C) |
| Peanut | 55°F (12.8°C) | 95°F (35°C) |
| Sorghum | 55°F (12.8°C) | 95°F (35°C) |
| Soybean | 50°F (10°C) | 95°F (35°C) |
| Wheat | 32°F (0°C) | 86°F (30°C) |
References:
Degree-days and Phenology Models, University of California, Statewide Integrated Pest Management Program, http://www.ipm.ucdavis.edu/WEATHER/ddconcepts.html.
During precipitation events involving sleet, ice, or snow the rain gauges used by the Oklahoma Mesonet may freeze over and show no rainfall. Once air temperatures rise enough to allow thawing, accumulated frozen precipitation in the rain gauge will melt. The rain gauge will then show rainfall occurring, during a time when none has fallen. All Oklahoma Mesonet towers use unheated rain gauges since they are located in rural areas without nearby electricity. The solar panels and backup battery used to power data collection, storage, and radio transmission are not sufficient to allow the use of heated rain gauges.
A frozen precipitation event may also cause the wind speed sensors to freeze. When this happens stations will indicate no wind or wind direction. Weatherman have used freezing of the wind sensors to locate areas of severe icing.
The heat index is calculated from the air temperature and relative humidity. It is a measure of how hot humans really feel. It is important to note that the heat index values were devised for shady, light wind conditions. Exposure to full sunshine can increase the heat index values by up to 15°F. Strong hot, dry winds can also increase the heat hazard.
| Heat Index | Affects on the human body |
| 130 or above | Heat stroke highly likely with continued exposure. |
| 105 to 130 | Heat stoke likely with prolonged exposure. |
| 90 to 105 | Heat stroke possible with prolonged exposure. |
| 80 to 90 | Fatigue possible with prolonged exposure. |
Elderly persons, small children, chronic invalids, those on certain medications or drugs (especially tranquilizers and anticholinergics), persons who are obese, and those with alcohol problems are more susceptible to heat disorders.
HEAT DISORDER SYMPTOMS
| Heat Disorder | Symptoms | First Aid |
| Sunburn | Skin redness and pain. In severe cases, swelling of skin, blisters, fever, headaches. | Ointment for mild cases, if blisters appear. If breaking occurs, apply dry sterile dressing. Serious, extensive cases should be seen by a physician. |
| Heat Cramps | Painful spasms usually in muscles of legs and abdomen possible. Heavy sweating. | Apply firm pressure on cramping muscles, or gently massage to relieve spasm. Give sips of water. If nausea occurs, discontinue water. |
| Heat Exhaustion | Heavy sweating, weakness, skin cold, pale and clammy. Pulse thready. Normal temperature possible. Fainting and vomiting. | Get victim out of sun. Lay down and loosen clothing. Apply cool wet cloths. Fan or move victim to air conditioned room. Sips of water. If nausea occurs, discontinue water. If vomiting continues, seek immediate medical attention. |
| Heat Stroke or Sunstroke | High body temperature (106°F or higher). Hot dry skin. Rapid and strong pulse. Possible unconsciousness. | Heat stroke is a severe medical emergency. Summon medical assistance or get the victim to a hospital immediately. Delay can be fatal. Move the victim to a cooler environment. Reduce body temperature with cold bath or sponging. Use extreme caution. Remove clothing, use fans and air conditioners. If temperature rises again, repeat process. Do not give fluids. |
HEAT WAVE SAFETY TIPS
- Slow down. Strenuous activities should be reduced, eliminated, or rescheduled to the coolest time of the day. Individuals at risk should stay in the coolest available place, not necessarily indoors.
- Dress for summer. Lightweight, light-colored clothing reflects heat and sunlight, and helps the body maintain normal temperatures.
- Eat less protein. Protein increases metabolic heat production and increases water loss.
- Drink plenty of water or other nonalcoholic fluids, even when not thirsty. Water helps keep the body cool. Persons who have epilepsy, heart disease, kidney disease, liver disease, are on a fluid restrictive diet, or suffer from fluid retention should consult a physician before increasing fluid consumption.
- Avoid alcoholic beverages.
- Do not take salt tablets unless specified by a physician.
- Spend more time in air-conditioned places. Air conditioning in homes and other buildings markedly reduces heat danger.
- Reduce time in the sun. Sunburn reduces the body's ability to dissipate heat. When out in the sun, use sunscreen and where a shade hat.
- For more information, go to http://www.nws.noaa.gov/om/brochures/heat_wave.shtml.
Microsoft Internet Explorer Compatibility
The Mesonet WxScope Plugin is compatible with Microsoft Internet Explorer 6.0 and higher versions.
Netscape Browser Compatibility
The Mesonet WxScope Plugin is compatible with Netscape browsers versions 4.0, 7, and above.
Operating System Compatibility
The Mesonet WxScope Plugin is compatible with Windows 95/98/NT/2000/XP.
The Mesonet WxScope Plugin for Macintosh is compatible with OS 9.0/X.
OSU Cooperative Extension Service
The Oklahoma Cooperative Extension Service is your local contact to Oklahoma State University. An OSU County Extension office is located in the county seat of every Oklahoma county. They provide educational programs and resources in the areas of youth development, food preparation, home finances, horticulture, agriculture, and rural development. To locate the office in your county, click on the link under “Contacts” on the Oklahoma AgWeather home page.
Move the mouse over the graph you wish to print. Depress and hold down the “Ctrl” key while at the same time clicking the left mouse button. Continue to hold down the “Ctrl” key, scroll down to print, and click on print. Follow normal print selection and print procedures.
The color key and menu to the right of the radar display will allow you to adjust the radar display and map preferences. Click on the individual color boxes on the vertical bar to turn off and on any single or combination of colors. For example, when the radar is in Precipitation Mode (0-75 Dbz), it is often useful to turn off the 5, 10, and 15 Dbz colors. The rainfall from these lower units is very light and at times does not reach the ground.
The small arrows below the vertical colorized radar key allow you to select map preferences for state and county boundaries, US and state highways, and city and site names. To see the entire menu selection, click the box in between the two arrows. To cycle through individual menu items click either the left or right arrow. To make a change, click on the middle box. Move the mouse over the individual menu item that appears above and “right click” to turn off and on display items. To return to the colorized vertical radar key, “left click” the mouse on the radar at the bottom of the list.
Base Reflectivity is one of the basic quantities that a Doppler radar (like NEXRAD) measures. Other quantities produced by NEXRAD are not available on this web site. The radar operates by sending out a pulse of radiation through the radar beam and listening for an echo of radiation returned from a set of targets in the beam. These targets can be hydrometeors (snow, rain drops, hail, clouds drops or ice particles) or other targets (dust, smoke, birds, airplanes, insects).
Because the radar measures radiation, it uses a complex equation to convert the radiation (measured in Watts) to a quantity called reflectivity. This equation makes several assumptions, including that the target is liquid water (which, of course, is violated during hail and snowfall). Meteorologists plot reflectivity values on a map using a scale called dBZ.
In general, reflectivity values are related to the rainfall rate, with higher reflectivity values corresponding with heavier rainfall. The following table gives general rule-of-thumb interpretations for dBZ values:
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RADAR PRECIPITATION MODE AND CLEAR-AIR-MODE
The radar can operate in one of two scanning modes. The usual mode we are accustomed to viewing is "Precipitation Mode". The dBZ scale in precipitation mode is 0 to 75 dBZ. When the radar operates in precipitation mode, it will produce a new image for every product every 5 or 6 minutes.
The radar also has a more-sensitive "clear-air" mode in which the radar antenna rotates much more slowly. This allows more processing of the reflectivity information so features not seen in precipitation mode appear. The scale in clear-air mode runs from -32 to +32 dBZ, which is on the very bottom of the precipitation mode scale. When the radar detects precipitation echoes when it is in clear-air mode, it will automatically switch to precipitation mode. Clear-air mode is useful in tracking atmospheric boundaries like cold fronts and dry lines because their "thin-line" signatures in clear-air mode appear more distinct than in precipitation mode.
The radar maps use a custom “plugin” to allow you to zoom, hide/show overlays, and interact with the data. Mac/Windows customers must install OCS’s free WxScope® Plugin to display these maps, graphs, and animations. The latest version of the plugin can be downloaded from http://sdg.mesonet.org/.
WxScope Plugin was developed to provide hundreds of customized products to Mesonet customers while only having to maintain a minimal number of data files on the Mesonet web servers. All products are created “on the fly” on the client machine using a standardized set of data files from the web server. Maps are customized using the WeatherObjects Markup Language (WxML).
Move the mouse over the graph you wish to save. Depress and hold down the “Ctrl” key while at the same time clicking the left mouse button. Continue to hold down the “Ctrl” key, scroll down to save, and click on save. Follow normal procedures to save a file.
Oklahoma Mesonet sunlight or solar radiation values are reported as watts per meter squared. The maximum potential in the summer near noon is close to 1,000 watts per meter squared. In the winter the maximum potential is lower due to a shift in the earths axis.
GENERAL SOLAR RADIATION CONDITIONS
| Solar Radiation (watts/m2) | Sky Conditions |
| 800-1000 | Full Sun |
| 400-600 | Light Clouds |
| 200-400 | Overcast |
| 50-200 | Heavy Clouds |
| Name | Code | County | Location | Soil Type (5 cm) | Soil Type (25 cm) |
| Acme | ACME | Grady | 4.0 WNW of Rush Springs | Sandy loam | Sandy clay loam |
| Ada | ADAX | Pontotoc | 2.0 NNE of Ada | N/A | N/A |
| Altus | ALTU | Jackson | 3.0 S of Altus | Clay loam | Clay loam |
| Alva | ALV2 | Woods | 7.2 SSW of Alva | N/A | N/A |
| Antlers | ANTL | Pushmataha | 5.0 W of Antlers | Loamy sand | Loamy sand |
| Apache | APAC | Caddo | 4.0 ENE of Apache | Loamy sand | Sandy loam |
| Ardmore | ARDM | Ardmore | 3.0 ENE of Ardmore | Loam | Clay |
| Arnett | ARNE | Ellis | 8.0 WSW of Arnett | Sandy loam | Loam |
| Beaver | BEAV | Beaver | 1.0 SSW of Beaver | Loam | Clay loam |
| Bee | BEEX | Johnston | 3.8 SE of Tishmingo | N/A | N/A |
| Bessie | BESS | Washita | 4.0 WNW of Bessie | N/A | N/A |
| Bixby | BIXB | Tulsa | 2.0 NE of Bixby | Sandy loam | Silt loam |
| Blackwell | BLAC | Kay | 4.0 SSE of Blackwell | Silt loam | Clay loam |
| Boise City | BOIS | Cimarron | 3.0 SSE of Boise City | Clay loam | Clay loam |
| Bowlegs | BOWL | Seminole | 3.0 NE of Bowlegs | Sandy loam | Sandy loam |
| Breckinridge | BREC | Garfield | 3.0 SE of Breckinridge | N/A | N/A |
| Briston | BRIS | Creek | 4.0 SE of Bristow | N/A | N/A |
| Buffalo | BUFF | Harper | 0.5 SW of Buffalo | Loam | Silt loam |
| Burbank | BURB | Osage | 7.0 SW of Burbank | N/A | N/A |
| Burneyville | BURN | Love | 2.0 SE of Burneyville | Loamy sand | Sandy loam |
| Butler | BUTL | Custer | 5.0 SW of Butler | Silt loam | Silty clay loam |
| Byars | BYAR | Garvin | 3.0 ESE of Byars | Loamy sand | Sandy clay loam |
| Calvin | CALV | Hughes | 5.0 WNW of Calvin | N/A | N/A |
| Camargo | CAMA | Dewey | 4.0 WNW of Camargo | N/A | N/A |
| Centralhoma | CENT | Coal | 1.0 E of Centrahoma | Sandy loam | Loam |
| Chandler | CHAN | Lincoln | 3.0 NNE of Sparks | Sandy clay loam | Clay |
| Cherokee | CHER | Alfalfa | 0.5 SSW of Cherokee | Loam | Loam |
| Cheyenne | CHEY | Roger Mills | 6.0 SW of Cheyenne | Sandy loam | Sandy loam |
| Chickasha | CHIC | Grady | 2.0 SSE of Chickasha | N/A | N/A |
| Claremore | CLRM | Rogers | 1.8 WNW of Claremore | N/A | N/A |
| Clayton | CLAY | Pushmataha | 3.0 NNE of Clayton | N/A | N/A |
| Cloudy | CLOU | Pushmataha | 5.0 SSE of Cloudy | N/A | N/A |
| Cookson | COOK | Cherokee | 7.0 NNW of Marble City | N/A | N/A |
| Copan | COPA | Washington | 2.0 ENE of Copan | N/A | N/A |
| Durant | DURA | Bryan | 6.0 SSE of Durant | Sandy loam | Sandy clay loam |
| El Reno | ELRE | Canadian | 5.0 WNW of El Reno | Silt loam | Silt loam |
| Erick | ERIC | Beckham | 4.0 ESE of Erick | Loamy sand | Loamy sand |
| Eufala | EUFA | McIntosh | 4.0 WNW of Eufaula | Loam | Loam |
| Fairview | FAIR | Major | 1.0 W of Fairview | Silt loam | Silt loam |
| Foraker | FORA | Osage | 8.0 ESE of Foraker | Sandy loam | Sandy loam |
| Fort Cobb | FTCB | Caddo | 4.0 NNW of Fort Cobb | Loamy sand | Sandy clay loam |
| Freedom | FREE | Woodward | 3.0 SSW of Freedom | N/A | N/A |
| Goodwell | GOOD | Texas | 2.0 E of Goodwell | Loam | Loam |
| Grandfield | GRA2 | Tillman | 3.3 W of Grandfield | N/A | N/A |
| Gutherie | GUTH | Logan | 4.0 WSW of Guthrie | N/A | N/A |
| Haskell | HASK | Muskogee | 5.0 SSE of Haskell | Silt loam | Silt loam |
| Hectorville | HECT | Okmulgee | 4.1 W of Hectorville | Loam | Sandy loam |
| Hinton | HINT | Caddo | 7.0 W of Hinton | Sandy loam | Loamy sand |
| Hobart | HOBA | Kiowa | 4.0 SE of Hobart | Silty clay loam | Silty clay |
| Hollis | HOLL | Harmon | 3.0 W of Gould | Silty clay | Clay |
| Hooker | HOOK | Texas | 1.0 W of Hooker | N/A | N/A |
| Hugo | HUGO | Choctaw | 2.0 NW of Hugo | N/A | N/A |
| Idabel | IDAB | McCurtain | 5.0 SW of Idabel | N/A | N/A |
| Inola | INOL | Rogers | 3.1 SSE of Inola | N/A | N/A |
| Jay | JAYX | Delaware | 4.0 N of Jay | N/A | N/A |
| Kenton | KENT | Cimarron | 5.0 SE of Kenton | N/A | N/A |
| Ketchum Ranch | KETC | Stephens | 7.0 NW of Velma | Loam | Clay loam |
| Kingfisher | KING | Kingfisher | 2.0 NE of Kingfisher | Loam | Silt loam |
| Lahoma | LAHO | Major | 1.0 WSW of Lahoma | Silt loam | Clay loam |
| Lane | LANE | Atoka | 1.0 WNW of Lane | Sandy loam | Sandy loam |
| Madill | MADI | Marshall | 4.5 SSE of Lebanon | N/A | N/A |
| Mangum | MANG | Greer | 5.0 SE of Mangum | Sand | Sand |
| Marena | MARE | Payne | 7.0 N of Coyle | Sandy clay loam | Loam |
| Marshall | MARS | Logan | 3.0 SSE of Marshall | Silt loam | Silty clay loam |
| May Ranch | MAYR | Woods | 16.0 NNE of Freedom |
Sandy loam | Loam |
| McAlester | MCAL | Pittsburg | 4.0 S of McAlester | N/A | N/A |
| Medford | MEDF | Grant | 1.0 SW of Medford | N/A | N/A |
| Medicine Park | MEDI | Comanche | 3.0 W of Medicine Park | N/A | N/A |
| Miami | MIAM | Ottawa | 2.0 NE of Miami | Silt loam | Silt loam |
| Minco | MINC | Grady | 2.0 SSW of Minco | N/A | N/A |
| Mt. Herman | MTHE | McCurtain | 16.0 SW of Smithville | N/A | N/A |
| Newkirk | NEWK | Kay | 8.0 E of Newkirk | N/A | N/A |
| Newport | NEWP | Carter | 7.0 WNW of Ardmore | N/A | N/A |
| Ninnekah | NINN | Grady | 2.0 NNW Ninnnekah | N/A | N/A |
| Norman | NRMN | Cleveland | 2.1 NW of Norman | N/A | N/A |
| Nowata | NOWA | Nowata | 3.0 SE of Delaware | Silt loam | Silt loam |
| Oilton | OILT | Creek | 6.0 ESE of Oilton | N/A | N/A |
| Okemah | OKEM | Okfuskee | 3.0 E of Okemah | N/A | N/A |
| Okmulgee | OKMU | Okmulgee | 3.0 SW of Morris | N/A | N/A |
| Pauls Valley | PAUL | Garvin | 1.0 SSW of Pauls Valley | N/A | N/A |
| Pawnee | PAWN | Pawnee | 3.0 ENE of Pawnee | Silty clay loam | Silty clay loam |
| Perkins | PERK | Payne | 2.0 NNW of Perkins | Loam | Loam |
| Porter | PORT | Wagoner | 2.5 W of Clarksville | N/A | N/A |
| Pryor | PRYO | Mayes | 5.0 S of Adair | N/A | N/A |
| Putnam | PUTN | Dewey | 3.0 N of Putnam | Loam | Silt loam |
| Red Rock | REDR | Noble | 7.0 SSE of Red Rock | N/A | N/A |
| Retrop | RETR | Washita | 10.0 ENE of Willow | N/A | N/A |
| Ringling | RING | Jefferson | 1/0 N of Ringling | N/A | N/A |
| Sallisaw | SALL | Seguoyah | 2.0 SSW of Sallisaw | N/A | N/A |
| Seiling | SEIL | Woodward | 7.0 WNW of Seiling | Loam | Loam |
| Shawnee | SHAW | Pottawatomie | 3.0 NNW of Shawnee | N/A | N/A |
| Skiatook | SKIA | Osage | 4.0 NW of Skiatook | Sandy loam | Sandy loam |
| Slapout | SLAP | Beaver | 8.0 W of Slapout | N/A | N/A |
| Spencer | SPEN | Oklahoma | 2.0 ENE of Spencer | N/A | N/A |
| Stigler | STIG | Haskell | 3.0 WNW of Stigler | N/A | N/A |
| Stillwater | STIL | Payne | 2.0 W of Stillwater | Silty clay loam | Loam |
| Stuart | STUA | Pittsburg | 3.0 SE of Stuart | Loamy Sand | Sandy loam |
| Sulphur | SULP | Murray | 4.0 NNE of Sulphur | N/A | N/A |
| Tahlequah | TAHL | Cherokee | 4.0 N of Tahlequah | N/A | N/A |
| Talihina | TALI | LeFlore | 4.0 SE of Talihina | N/A | N/A |
| Tipton | TIPT | Tillman | 4.0 S of Tipton | Sandy loam | Sandy loam |
| Tishmingo | TISH | Johnston | 6.0 N of Tishomingo | N/A | N/A |
| Vanoss | VANO | Pontotoc | 2.4 NE of Vanoss | N/A | N/A |
| Vinita | VINI | Craig | 7.0 E of Centralia | N/A | N/A |
| Walters | WALT | Cotton | 1.0 NW of Walters | Silty loam | Silty clay loam |
| Washington | WASH | McClain | 6.0 SSW of Washington | N/A | N/A |
| Watonga | WATO | Blain | 7.0 W of Watonga | Loam | Loam |
| Waurika | WAUR | Jefferson | 0.5 ENE of Waurika | Sandy loam | Sandy loam |
| Weatherford | WEAT | Custer | 4.0 WSW of Weatherford | N/A | N/A |
| Webbers Falls | WEBB | Muskogee | 3.0 S of Webbers Falls | N/A | N/A |
| Westville | WEST | Adair | 5.0 WNW of Westville | Silt loam | Silty clay loam |
| Wilburton | WILB | Latimer | 2.0 SW of Wilberton | N/A | N/A |
| Wister | WIST | LeFlore | 3.0 ENE of Wister | Silt loam | Silt loam |
| Woodward | WOOD | Woodward | 2.0 WSW of Woodward | Sandy loam | Loam |
| Wynona | WYNO | Osage | 2.0 S of Wynona | N/A | N/A |
Technical support for Oklahoma Mesonet Plugins software installation and use is available on weekdays by calling a Mesonet Operator at 405-325-3231.
CHIL = wind chill
HEAT = heat index
PALT = sea level pressure
PRES = station pressure
RAIN = rainfall since 0000 GMT (Greenwich Mean Time/ 6:00 PM CSTD)
RELH = relative humidity (1.5 meters/5 feet)
SRAD = solar radiation
TAIR = air temperature (1.5 meters/5 feet)
TA9M = air temperature (9 meters/30 feet)
TDEW = dewpoint temperature
TB05 = bare soil temperature (5 centimeters/2 inches)
TB10 = bare soil temperature (10 centimeters/4 inches)
TR05 = soil moisture (5 centimeters/2 inches)
TR25 = soil moisture (25 centimeters/10 inches)
TR60 = soil moisture (60 centimeters/24 inches)
TR75 = soil moisture (75 centimeters/30 inches)
TS05 = soil temperature under sod (5 centimeters/2 inches)
TS10 = soil temperature under sod (10 centimeters/4 inches)
TS30 = soil temperature under sod (30 centimeters/12 inches)
WDIR = average vector wind direction (360° circle where north is
0°)
WMAX = maximum wind speed (10 meters/33 feet)
WS2M = average wind speed (2 meters/7 feet)
WSPD = average wind speed (10 meters/33 feet)
WVEC = average vector wind speed (10 meters/33 feet)
In order to assist the data needs of the Oklahoma State University Nitrogen Use Efficiency program for winter wheat the Oklahoma Mesonet has implemented two products that count the number of days with positive degree-day units. Technology developed from the OSU Nitrogen Use Efficiency research is marketed by NTech Industries under the Greenseekerâ label.
The Oklahoma Mesonet Number of Days GDD>0 Map and Table products use a lower air temperature threshold of 40°F (4.4°C) and an upper air temperature threshold of 86°F (30°C). The Oklahoma Mesonet uses the "Cutoff Method" to calculate degree-day values, based on the following formula:
Degree-days = (Maximum Daily Air Temp + Minimum Daily Air Temp)/2 - 40°F (4.4°C)
When the maximum daily air temperature is above wheat's upper temperature threshold, the maximum daily air temperature is set to 86°F (30°C). When the degree-day value is negative, the degree-day value is set to zero.
Degree-day units are calculated for each day. When the degree-day units are greater than zero (GDD>0), the day is added to the number of days GDD>0 from the selected Start or Planting Date. The Oklahoma Mesonet Number of Days GDD>0 Map and Table default to the current date for both the Start and End Dates. The user needs to select the Start Date (planting date), being careful to select the correct year.
The Number of Days GDD>0 Map is a zoomable, color-contoured Oklahoma map that shows the count of days with positive degree-day units from the user selected Start Date for all Oklahoma Mesonet sites. The legend to the right of the map shows the range in number of days GDD>0 for the Start and End Dates selected and the corresponding color.
The Number of Days GDD>0 Table shows the count of days with positive degree-day units back to the entered Planting Date for a single Mesonet site. The fourth column shows the number of days GDD>0 for the Mesonet site selected for any corresponding Date in the first column.
Calculation and display of data for the degree-day products is slower than other Oklahoma Mesonet data products. If no data appears, be sure that the most current WxScope Plugin version has been loaded.
There are two ways to print the table. One way is to use the Print command in your browser toolbar. The other method is to place the mouse anywhere over the table and click the right mouse button. A menu will pop up that has a Print option on it. Using this latter method will let you print the table without the browser shell and menu items.
For additional information on the OSU Nitrogen Use Efficiency, click on the OSU Greenseeker menu tab under Wheat or contact Bill Raun, Oklahoma State University, Plant and Soil Science Department, email: wrr@mail.pss.okstate.edu. Another resource person is Jeff Edwards, Wheat Extension Specialist, Oklahoma State University, Plant and Soil Science Department, email: edwarjt@okstate.edu.
The "Wheat First Hollow Stem" map shows the first reported date of first hollow stem in the wheat variety Jagger, the earliest variety to reach first hollow stem. The dates on the map are located over the Mesonet tower location closest to the wheat field reported. The dates are displayed as Julian days. When the Julian date is entered in the Date Converter at the top of the map, the corresponding month and day will appear to the right of the "Convert>" box. The dates shown on the map have been reported by the OSU Cooperative Extension Service agriculture/4-H county educators.
Wind barbs are the standard meteorological symbol to show both wind speed and direction. The wind barbs used on Oklahoma Mesonet products are centered on Mesonet tower locations. The dot end of the wind barb shows the direction the wind is blowing to. The end of the wind barb with one or more side barbs shows the direction the wind is coming from.
The length and number of side barbs indicates the current 15-minute average wind speed to the nearest 5 miles per hour. A single short side barb represents a 5 mile per hour wind. A single long side barb is displayed when the wind reaches 10 miles per hour. Multiple side barbs values are added together to indicate wind speed, until the winds reach 50 miles per hour. A pennant, along with side barbs as needed, are displayed when the wind speed is 50 miles per hour or higher.
The wind chill index is calculated from the temperature and wind speed to estimate how cold the air appears to be when the wind is blowing. Oklahoma Mesonet wind chill products are based on the new wind chill formula listed below. It was adopted by the National Weather Service on November 1, 2001. The new formula was developed to more accurately reflect the human danger to frostbite and cold exposure. Frostbite occurs in 15 minutes or less at wind chill index values of -18°F or lower. For more information, go to www.nws.noaa.gov/om/windchill/index.shtml.
Wind Chill (°F) = 35.74 + 0.6215T - 35.75(V0.16) + 0.4275(V0.16)
Where, T = air temperature (°F) and V = Wind speed (mph)
WxScope Plugin Downloading and Installation
1. Click on WxScope Plugin box on Oklahoma AgWeather home page.
2. Select WxScope for Windows or Macintosh.
3. Click on “Open”. The Oklahoma Mesonet download site is
a secure site and protected against viruses and virus transfer.
4. The files will begin automatic download and installation.
5. Click on “Next” buttons and “Yes” to accept
the software agreement.
6. Click on “Finish” and WxScope Plugin is now loaded on your
computer.