Alert archive / Wyoming / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 56, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Aug 19, 2007, 2:23 PM MDT for Fremont County, Sublette County, Wyoming. It was in force for 52 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 19, 2007, 2:23 PM MDT (20:23 UTC)
- Expired
- Aug 19, 2007, 3:15 PM MDT
- In force
- 52 min
- Issued by
- NWS Riverton, WY
- Area
- Counties, with a storm outline in the text
Counties Fremont County, WY, Sublette County, WY
The radar
The Riverton/Lander radar (KRIW), 67 km from the middle of the area, began a volume at 20:24 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 19, 1:36 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 8.4 hours before the alert went out and 73 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2424 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 133 m²/s²
- 0-3 km storm-relative helicity
- 108 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Riverton, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 19, 11:53 AM MDT, 2 hours 30 minutes earlier.
Area forecast discussion, Aug 19, 11:53 AM MDT, 2 hours 30 minutes before
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</html>Hazardous weather outlook, Aug 19, 1:35 PM MDT, 48 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 135 PM MDT SUN AUG 19 2007 WYZ001>020-022>030-201300- ABSAROKA MOUNTAINS-BIGHORN MOUNTAINS SOUTHEAST- BIGHORN MOUNTAINS WEST-CASPER MOUNTAIN-CODY FOOTHILLS- EAST SWEETWATER COUNTY-FLAMING GORGE- GREEN MOUNTAINS AND RATTLESNAKE RANGE-JACKSON HOLE-LANDER FOOTHILLS- NATRONA COUNTY LOWER ELEVATIONS-NORTH BIG HORN BASIN- NORTHEAST JOHNSON COUNTY-OWL CREEK AND BRIDGER MOUNTAINS- ROCK SPRINGS AND GREEN RIVER-SALT RIVER AND WYOMING RANGES- SOUTH LINCOLN COUNTY-SOUTHEAST BIG HORN BASIN- SOUTHEAST JOHNSON COUNTY-SOUTHWEST BIG HORN BASIN-STAR VALLEY- TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN- UPPER GREEN RIVER BASIN FOOTHILLS-UPPER WIND RIVER BASIN- WIND RIVER BASIN-WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST- YELLOWSTONE NATIONAL PARK- 135 PM MDT SUN AUG 19 2007 ...RED FLAG WARNING IN EFFECT SUNDAY 2 PM THROUGH 9 PM FOR PORTIONS OF CENTRAL AND SOUTHERN WYOMING... ...SEVERE THUNDERSTORM WATCH 617 IS IN EFFECT UNTIL 8 PM FOR MUCH OF WESTERN AND CENTRAL WYOMING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON AND TONIGHT...MAINLY BETWEEN 3 PM AND 9 PM. THE MOST LIKELY AREAS TO HAVE SEVERE THUNDERSTORMS WILL BE ACROSS WESTERN AND NORTHERN WYOMING. THE MAIN HAZARDS WILL BE LARGE HAIL AND DAMAGING WINDS. THE ONLY AREAS NOT INCLUDED IN SEVERE THUNDERSTORM WATCH 617 ARE NATRONA AND JOHNSON COUNTIES. SOUTHWEST WIND WILL CONTINUE TO INCREASE THIS MORNING AND BECOME STRONG LATER THIS AFTERNOON...AHEAD OF AN APPROACHING STORM SYSTEM. THIS SOUTHWEST WIND WILL BEGIN TO USHER IN DRIER AIR INTO THE REGION. THESE STRONG WINDS COMBINED WITH LOW HUMIDITIES WILL CREATE RED FLAG CONDITIONS IN PORTIONS OF CENTRAL AND SOUTHERN WYOMING THIS AFTERNOON AND EVENING. A STRONG COLD FRONT WILL MOVE ACROSS WEST AND CENTRAL WYOMING THIS EVENING. WEST WIND AT 20 TO 30 MPH WITH GUSTS TO 40 MPH WILL ACCOMPANY THE FRONT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTERS...PLEASE REPORT ANY WIND GUSTS OVER 40 MPH AND HAIL SIZES THIS AFTERNOON AND TONIGHT. TEAM RIVERTON
In the hours before
Special weather statement, Aug 19, 12:58 PM MDT, 1 hour 25 minutes before
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</html>Special weather statement, Aug 19, 1:24 PM MDT, 59 minutes before
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</html>Special weather statement, Aug 19, 1:29 PM MDT, 54 minutes before
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</html>Special weather statement, Aug 19, 1:40 PM MDT, 43 minutes before
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</html>Special weather statement, Aug 19, 1:54 PM MDT, 29 minutes before
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</html>Special weather statement, Aug 19, 2:10 PM MDT, 13 minutes before
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</html>The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 2:54 AM MDT | Red Flag Warning | RIW | Fremont, Lincoln, Natrona, Sublette, Sweetwater, Uinta | 17 hr |
| Aug 19, 2:31 PM MDT | Severe Thunderstorm Warning | RIW | Teton | 59 min |
| Aug 19, 2:58 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 62 min |
| Aug 19, 3:44 PM MDT | Severe Thunderstorm Warning | RIW | Fremont, Sublette | 61 min |
| Aug 19, 4:19 PM MDT | Red Flag Warning | RIW | Fremont, Lincoln, Natrona, Sublette, Sweetwater, Uinta | 28 hr |
| Aug 19, 4:45 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 60 min |
| Aug 19, 5:15 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 37 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2007Every severe thunderstorm warning in 2007
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.