Alert archive / Wyoming / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 23, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Jun 30, 2009, 5:12 PM MDT for Teton County, Wyoming. It was in force for 63 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
- Jun 30, 2009, 5:12 PM MDT (23:12 UTC)
- Expired
- Jun 30, 2009, 6:15 PM MDT
- In force
- 63 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
County Teton County, WY
The radar
The Pocatello radar (KSFX), 193 km from the middle of the area, began a volume at 23:13 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, 11.2 hours before the alert went out and 201 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
- 2371 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 152 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 Jun 30, 3:34 PM MDT, 1 hour 38 minutes earlier.
Area forecast discussion, Jun 30, 3:34 PM MDT, 1 hour 38 minutes before
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</html>Hazardous weather outlook, Jun 30, 5:00 AM MDT, 12 hours 12 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 500 AM MDT TUE JUN 30 2009 WYZ001>020-022>030-011100- 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- 500 AM MDT TUE JUN 30 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS ARE EXPECTED AGAIN OVER MUCH OF THE THIS AFTERNOON AND EVENING. THEY WILL BE MOST NUMEROUS OVER THE NORTHWEST. THE MAIN HAZARDS WILL BE LIGHTNING AND GUSTY WINDS TO 50 MPH...THOUGH SOME HEAVY RAIN AND SMALL HAIL ARE POSSIBLE OVER THE NORTHWEST. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY A DISTURBANCE WILL MOVE ACROSS SOUTHERN WYOMING WEDNESDAY BRINGING WITH IT SOME THUNDERSTORMS. A COLD FRONT WILL MOVE THROUGH BEHIND THE DISTURBANCE BRINGING COOLER TEMPERATURES AND INCREASED HUMIDITY. THIS WILL RAISE THE POTENTIAL FOR HEAVY RAINFALL WITH THUNDERSTORMS WEDNESDAY AND THURSDAY AFTERNOONS AND EVENINGS. AT LEAST ISOLATED THUNDERSTORMS ARE EXPECTED FRIDAY AS MONSOONAL MOISTURE ROTATES NORTHEAST ACROSS THE AREA. LATER FRIDAY INTO FRIDAY NIGHT...A COLD FRONT MAY DROP SOUTH AND SET THE STAGE FOR SOME STRONGER THUNDERSTORM OVER THE WEEKEND EAST OF THE CONTINENTAL DIVIDE. THUNDERSTORM COVERAGE WILL LIKELY DECREASE MONDAY. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ASKED TO REPORT ANY WIND GUSTS IN EXCESS OF 40 MPH OR HAIL WITH THUNDERSTORMS. THANK YOU. TEAM RIVERTON
In the hours before
Special weather statement, Jun 30, 1:08 PM MDT, 4 hours 4 minutes before
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</html>Special weather statement, Jun 30, 4:54 PM MDT, 18 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
454 PM MDT TUE JUN 30 2009
WYZ012-013-302345-
JACKSON HOLE-TETON AND GROS VENTRE MOUNTAINS-
454 PM MDT TUE JUN 30 2009
...SIGNIFICANT WEATHER ADVISORY FOR TETON COUNTY AND GRAND TETON
NATIONAL PARK UNTIL 545 PM MDT...
AT 449 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM ABOUT 10 MILES WEST
OF COLTER BAY VILLAGE...SOUTHWEST THROUGH THE GRAND TARGHEE SKI AREA
TO ABOUT 10 MILES WEST OF JACKSON...MOVING NORTHEAST AT 20 MPH.
ONE HALF INCH DIAMETER HAIL...AND WINDS AROUND 45 MPH ARE POSSIBLE
WITH THESE STORMS. DANGEROUS CLOUD-TO-GROUND LIGHTNING IS POSSIBLE
WITH THESE STORMS.
RESIDENTS AND VISITORS IN TETON COUNTY AS WELL AS GRAND TETON
NATIONAL PARK...INCLUDING THE LOCATIONS OF GRAND TARGHEE SKI
AREA...FONDA POINT CAMPGROUND...MOUNT MORAN...TETON PASS...MOOSE
...MORAN BAY...GRAND TETON...JACKSON AND LEIGH LAKE...SHOULD
MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS
AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER
THREATEN.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOVE INDOORS IMMEDIATELY AS THIS STORM APPROACHES YOUR LOCATION. THIS
IS A POTENTIALLY DANGEROUS STORM. IF YOU ARE IN ITS PATH...YOU SHOULD
BE PREPARED FOR GUSTY WINDS...HAIL...AND DEADLY CLOUD TO GROUND
LIGHTNING. IF A STURDY STRUCTURE IS NOT AVAILABLE...SEEK SHELTER IN A
VEHICLE WITH THE WINDOWS UP.
&&
REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.
LAT...LON 4371 11106 4409 11082 4413 11024 4362 11057
4331 11069 4329 11105
TIME...MOT...LOC 2250Z 265DEG 16KT 4402 11074 4361 11100
4337 11110
MURRELLThe office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 29, 7:47 PM MDT | Special Weather Statement | RIW | Teton | 58 min |
| Jun 29, 8:07 PM MDT | Special Weather Statement | RIW | 38 min | |
| Jun 29, 8:27 PM MDT | Special Weather Statement | RIW | 48 min | |
| Jun 29, 8:37 PM MDT | Special Weather Statement | RIW | Teton | 38 min |
| Jun 29, 9:16 PM MDT | Special Weather Statement | RIW | Teton | 29 min |
| Jun 30, 10:15 AM MDT | Special Weather Statement | RIW | Hot Springs | 45 min |
| Jun 30, 11:09 AM MDT | Special Weather Statement | RIW | Washakie | 36 min |
| Jun 30, 1:08 PM MDT | Special Weather Statement | RIW | Johnson | 22 min |
| Jun 30, 4:54 PM MDT | Special Weather Statement | RIW | Teton | 51 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2009Every severe thunderstorm warning in 2009
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.