Alert archive / Wyoming / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 62, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Aug 22, 2007, 2:53 PM MDT for Fremont County, Lincoln 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 22, 2007, 2:53 PM MDT (20:53 UTC)
- Expired
- Aug 22, 2007, 3:45 PM MDT
- In force
- 52 min
- Issued by
- NWS Riverton, WY
- Area
- Counties, with a storm outline in the text
Counties Fremont County, WY, Lincoln County, WY
The radar
The Riverton/Lander radar (KRIW), 106 km from the middle of the area, began a volume at 20:55 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 nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 8.9 hours before the alert went out and 111 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
- 1955 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 212 m²/s²
- 0-3 km storm-relative helicity
- 283 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 22, 2:41 AM MDT, 12 hours 12 minutes earlier.
Area forecast discussion, Aug 22, 2:41 AM MDT, 12 hours 12 minutes before
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</html>Hazardous weather outlook, Aug 22, 12:30 PM MDT, 2 hours 23 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 1230 PM MDT WED AUG 22 2007 WYZ001>020-022>030-231100- 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- 1230 PM MDT WED AUG 22 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO CONTINUE DEVELOPING OVER WESTERN WYOMING THIS AFTERNOON AND SPREAD INTO CENTRAL WYOMING THIS EVENING. SOME OF THESE STORMS WILL BE CAPABLE OF PRODUCING SMALL HAIL...GUSTY WINDS NEAR 45 MPH...BRIEF HEAVY RAINFALL AND FREQUENT LIGHTNING. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY ANOTHER ROUND OF SHOWERS AND ISOLATED THUNDERSTORMS WILL AFFECT MAINLY CENTRAL WYOMING THURSDAY AFTERNOON AND EVENING. BREEZY...WARM AND DRY CONDITIONS MAY BRING A RETURN TO CRITICAL FIRE WEATHER CONDITIONS ACROSS MUCH OF WEST AND CENTRAL WYOMING SATURDAY AND SUNDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. TEAM RIVERTON
In the hours before
Special weather statement, Aug 22, 1:42 PM MDT, 1 hour 11 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 142 PM MDT WED AUG 22 2007 WYZ002-012-013-222100- ABSAROKA MOUNTAINS-JACKSON HOLE-TETON AND GROS VENTRE MOUNTAINS- 142 PM MDT WED AUG 22 2007 STRONG THUNDERSTORMS WILL MOVE NORTHEAST AT 30 MPH AND IMPACT PORTIONS OF NORTHWEST WYOMING THROUGH 300 PM MDT. THESE STORMS ARE CAPABLE OF PRODUCING A QUICK ONE-QUARTER TO ONE-HALF INCH OF RAIN AS THEY QUICKLY TRACK ACROSS THE REGION. ALSO...PEA-SIZED HAIL MAY QUICKLY ACCUMULATE TO A DEPTH OF AN INCH OR TWO WITH THE STRONGEST STORMS. THE LARGEST SIZED HAIL ANTICIPATED IS ONE-HALF INCH DIAMETER. FREQUENT LIGHTNING WILL ACCOMPANY THESE STORMS. MOTORISTS FROM MORAN JUNCTION TO TOGWOTEE PASS ON HIGHWAY 26 SHOULD PREPARE FOR SMALL HAIL TO ACCUMULATE ON THE ROAD ALONG WITH PONDING OF WATER. IF YOU ARE OUTDOORS BE SURE TO MOVE INSIDE A STURDY SHELTER OR AT A MINIMUM INSIDE A VEHICLE AS THE STORMS APPROACH TO PROTECT YOURSELF FROM LIGHTNING.
Special weather statement, Aug 22, 2:37 PM MDT, 16 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 237 PM MDT WED AUG 22 2007 WYZ027-222115- SOUTH LINCOLN COUNTY- 237 PM MDT WED AUG 22 2007 AN AREA OF STRONG THUNDERSTORMS WILL MOVE NORTHEAST ACROSS SOUTHERN LINCOLN COUNTY THROUGH AT LEAST 315 PM. THESE STORMS WILL AFFECT THE AREA FROM JUST WEST OF KEMMERER TO THE SWEETWATER COUNTY LINE ALONG HIGHWAY 30. HIGHWAY 189 SOUTH OF KEMMERER WILL ALSO BE IMPACTED. THESE STORMS WILL BE CAPABLE OF PRODUCING BRIEF HEAVY RAIN...UP TO HALF INCH HAIL...DANGEROUS LIGHTNING AND WIND GUSTS UP TO 55 MPH. PLEASE TAKE SHELTER INDOORS AS THESE STORMS MOVE THROUGH YOUR AREA. IF DRIVING...SLOW DOWN AND AVOID HYDROPLANING. SKRBAC
Special weather statement, Aug 22, 2:42 PM MDT, 11 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 242 PM MDT WED AUG 22 2007 WYZ005-007-017-222130- OWL CREEK AND BRIDGER MOUNTAINS-SOUTHWEST BIG HORN BASIN- WIND RIVER BASIN- 242 PM MDT WED AUG 22 2007 AN AREA OF STRONG THUNDERSTORMS WILL MOVE NORTHEAST AT 30 MPH ACROSS HOT SPRINGS COUNTY AND NORTHERN FREMONT COUNTY THROUGH 330 PM MDT. THESE STORMS WILL BE CAPABLE OF PRODUCING PEA-SIZED HAIL...GUSTY WIND TO AROUND 50 MPH...AND BRIEF HEAVY RAINFALL OF ONE-QUARTER TO ONE- HALF INCH. IMPACTED AREAS INCLUDE BOYSEN STATE PARK AND THERMOPOLIS. MOTORISTS ON HIGHWAY 789 BETWEEN THERMOPOLIS AND SHOSHONI THROUGH THE WIND RIVER CANYON SHOULD BE PREPARED FOR REDUCED VISIBILITY AND WATER AND HAIL ON THE ROAD SURFACE. PLEASE TAKE SHELTER INDOORS AS THESE STORMS MOVE THROUGH YOUR AREA. IF DRIVING...SLOW DOWN AND AVOID HYDROPLANING.
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 3:02 PM MDT | Severe Thunderstorm Warning | RIW | Lincoln | 43 min |
| Aug 22, 4:02 PM MDT | Severe Thunderstorm Warning | RIW | Sweetwater | 13 min |
| Aug 22, 4:13 PM MDT | Severe Thunderstorm Warning | RIW | Sweetwater | 47 min |
| Aug 22, 4:31 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 29 min |
| Aug 22, 4:45 PM MDT | Severe Thunderstorm Warning | RIW | Johnson, Natrona | 60 min |
| Aug 22, 5:05 PM MDT | Severe Thunderstorm Warning | RIW | Sweetwater | 40 min |
| Aug 22, 5:11 PM MDT | Severe Thunderstorm Warning | RIW | Fremont, Hot Springs | 49 min |
| Aug 22, 5:30 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 45 min |
| Aug 22, 5:42 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 33 min |
| Aug 22, 5:46 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 44 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.