Alert archive / Wyoming / Severe Thunderstorm Warnings in 2008
Severe Thunderstorm Warning 72, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Jul 6, 2008, 4:11 PM MDT for Fremont County, Wyoming. It was in force for 49 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
- Jul 6, 2008, 4:11 PM MDT (22:11 UTC)
- Expired
- Jul 6, 2008, 5:00 PM MDT
- In force
- 49 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
County Fremont County, WY
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 6, 1:32 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 10.2 hours before the alert went out and 19 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
- 544 J/kg
- Mixed-layer CIN
- -173 J/kg
- Mixed-layer LCL
- 1453 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 117 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
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 Jul 6, 3:13 PM MDT, 58 minutes earlier.
Area forecast discussion, Jul 6, 3:13 PM MDT, 58 minutes before
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</html>Hazardous weather outlook, Jul 6, 2:43 PM MDT, 1 hour 28 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 243 PM MDT SUN JUL 6 2008 WYZ001>020-022>030-071101- 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- 243 PM MDT SUN JUL 6 2008 ...SEVERE THUNDERSTORM WATCH 660 IN EFFECT UNTIL 9 PM FOR BIG HORN... FREMONT...HOT SPRINGS...JOHNSON...NATRONA...PARK AND WASHAKIE COUNTIES... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT SEVERE THUNDERSTORM WATCH 660 IN EFFECT UNTIL 9 PM FOR BIG HORN... FREMONT...HOT SPRINGS...JOHNSON...NATRONA...PARK AND WASHAKIE COUNTIES. ISOLATED SEVERE THUNDERSTORMS WITH LARGE HAIL....HEAVY DOWNPOURS ALONG WITH LOCAL FLASH FLOODING...AND DAMAGING WIND WILL BE LIKELY ACROSS MUCH OF CENTRAL WYOMING THIS AFTERNOON AND EVENING. PEOPLE LIVING IN THE COUNTIES AFFECTED BY THE SEVERE THUNDERSTORM WATCH SHOULD MONITOR THEIR LOCAL MEDIA OR NOAA ALL HAZARDS RADIO FOR THE POSSIBLE ISSUANCE OF WARNINGS. ISOLATED TO SCATTERED THUNDERSTORMS WILL ALSO AFFECT WESTERN WYOMING THROUGH THIS EVENING WITH THE MAIN HAZARDS OF SMALL PEA TO DIME-SIZED HAIL... OCCASIONAL CLOUD TO GROUND LIGHTNING AND STRONG WIND GUSTS NEAR 50 MPH. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THUNDERSTORMS MAY BE ON THE INCREASE ACROSS THE AREA NEXT WEEKEND BUT SIGNIFICANT UNCERTAINTY STILL EXISTS ON THE EVENTUAL EVOLUTION OF THIS WEATHER PATTERN. STAY TUNED EACH DAY AS WE FINE TUNE THIS POTENTIAL THUNDERSTORM THREAT NEXT WEEKEND. SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS REQUESTED ACROSS BIG HORN...FREMONT...HOT SPRINGS...JOHNSON....NATRONA...PARK AND WASHAKIE COUNTIES. PLEASE REPORT ANY SEVERE WEATHER...ALONG WITH INTENSE RAINFALL TO THE NATIONAL WEATHER SERVICE IMMEDIATELY. TEAM RIVERTON
In the hours before
Special weather statement, Jul 6, 2:01 PM MDT, 2 hours 10 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 201 PM MDT SUN JUL 6 2008 WYZ014-015-025-026-062100- UPPER GREEN RIVER BASIN-UPPER GREEN RIVER BASIN FOOTHILLS-WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST- 201 PM MDT SUN JUL 6 2008 ...SIGNIFICANT WEATHER ADVISORY FOR FREMONT AND SUBLETTE COUNTIES... AT 154 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM NEAR U.S. HWY 191 MILE MARKER 80...OR 20 MILES SOUTH OF PINEDALE...MOVING EAST AT 22 MPH. HALF INCH HAIL...AND WINDS AROUND 50 MPH ARE POSSIBLE WITH THIS STORM. RESIDENTS IN CENTRAL FREMONT AND EASTERN SUBLETTE COUNTIES... INCLUDING THE LOCATIONS OF U.S. HWY 191 MILE MARKER 80...HWY JCT 191 AND 351...BIG SANDY AND BIG SANDY OPENING...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT SUNDAY EVENING FOR NORTHWESTERN WYOMING. REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4283 10909 4256 10902 4250 10977 4268 10981 TIME...MOT...LOC 2001Z 259DEG 19KT 4261 10967 T. BAKER
Special weather statement, Jul 6, 2:09 PM MDT, 2 hours 2 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 209 PM MDT SUN JUL 6 2008 WYZ026-028-062115- ROCK SPRINGS AND GREEN RIVER-UPPER GREEN RIVER BASIN- 209 PM MDT SUN JUL 6 2008 ...SIGNIFICANT WEATHER ADVISORY FOR SWEETWATER COUNTY... AT 200 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM NEAR JCT I80 AND HWY 30...OR 23 MILES NORTHEAST OF LYMAN...MOVING NORTHEAST AT 26 MPH. PEA SIZE HAIL...AND WINDS AROUND 50 MPH ARE POSSIBLE WITH THIS STORM. RAINFALL AMOUNTS AROUND ONE-HALF INCH ARE POSSIBLE WITH THIS STORM. RESIDENTS IN WESTERN SWEETWATER COUNTY...INCLUDING THE LOCATIONS OF JCT I80 AND HWY 30...I80 EXIT 68 AND STATE HWY 372 MILE MARKER 10... SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN. REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4144 10989 4157 11006 4195 10962 4177 10939 TIME...MOT...LOC 2009Z 225DEG 23KT 4157 10989 T. BAKER
Special weather statement, Jul 6, 2:19 PM MDT, 1 hour 52 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 219 PM MDT SUN JUL 6 2008 WYZ001-062200- YELLOWSTONE NATIONAL PARK- 219 PM MDT SUN JUL 6 2008 THUNDERSTORMS WILL INCREASE FROM THE WEST ENTRANCE ACROSS THE NORTHERN HALF OF THE PARK THROUGH 4 PM. THESE STORMS WILL MAINLY TRACK ALONG AND NORTH OF MADISON...NORRIS AND CANYON JUNCTIONS AFFECTING THE MAMMOTH HOT SPRINGS AREA. THE MAIN HAZARDS WITH THESE STORMS THIS AFTERNOON WILL BE OCCASIONAL CLOUD TO GROUND LIGHTNING...PEA TO DIME-SIZED HAIL AND HEAVY DOWNPOURS. PEOPLE IN YELLOWSTONE PARK SHOULD BE PREPARED TO SEEK NEARBY SHELTER THIS AFTERNOON. IF YOU CAN HEAR THUNDER...IT IS TIME TO SEEK SHELTER. AEM
Special weather statement, Jul 6, 2:37 PM MDT, 1 hour 34 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 237 PM MDT SUN JUL 6 2008 WYZ030-062300- EAST SWEETWATER COUNTY- 237 PM MDT SUN JUL 6 2008 NUMEROUS THUNDERSTORMS WILL CONTINUE OVER SOUTHERN SWEETWATER COUNTY...MAINLY SOUTH OF I 80. HOWEVER...SOME OF THESE STORMS WILL CROSS THE INTERSTATE IN THE VICINITY OF WAMSUTTER THROUGH 5 PM. EXPECT GUTSY WINDS TO 45 MPH...HEAVY RAIN AND FREQUENT LIGHTNING. TWB
Special weather statement, Jul 6, 3:29 PM MDT, 42 minutes before
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</html>Special weather statement, Jul 6, 3:59 PM MDT, 12 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 |
|---|---|---|---|---|
| Jul 5, 6:33 PM MDT | Special Weather Statement | RIW | Johnson | 42 min |
| Jul 6, 12:04 PM MDT | Special Weather Statement | RIW | Johnson | 56 min |
| Jul 6, 1:19 PM MDT | Flash Flood Warning | RIW | Johnson, Natrona, Washakie | 86 min |
| Jul 6, 1:23 PM MDT | Severe Thunderstorm Warning | RIW | Hot Springs | 67 min |
| Jul 6, 1:27 PM MDT | Severe Thunderstorm Warning | RIW | Hot Springs, Park, Washakie | 36 min |
| Jul 6, 1:38 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 23 min |
| Jul 6, 1:51 PM MDT | Severe Thunderstorm Warning | RIW | Sweetwater | 39 min |
| Jul 6, 2:01 PM MDT | Special Weather Statement | RIW | Sublette | 59 min |
| Jul 6, 2:08 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 52 min |
| Jul 6, 2:09 PM MDT | Special Weather Statement | RIW | 66 min | |
| Jul 6, 2:30 PM MDT | Severe Thunderstorm Warning | RIW | Fremont, Hot Springs | 45 min |
| Jul 6, 2:44 PM MDT | Severe Thunderstorm Warning | RIW | Johnson, Natrona | 46 min |
| Jul 6, 2:47 PM MDT | Flash Flood Warning | RIW | Johnson, Natrona | 118 min |
| Jul 6, 2:59 PM MDT | Severe Thunderstorm Warning | RIW | Fremont, Hot Springs, Washakie | 46 min |
| Jul 6, 2:59 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 46 min |
| Jul 6, 3:06 PM MDT | Severe Thunderstorm Warning | RIW | Hot Springs | 39 min |
| Jul 6, 3:19 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 26 min |
| Jul 6, 3:41 PM MDT | Severe Thunderstorm Warning | RIW | Fremont, Natrona | 27 min |
| Jul 6, 3:47 PM MDT | Severe Thunderstorm Warning | RIW | Washakie | 43 min |
| Jul 6, 3:49 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 56 min |
| Jul 6, 3:56 PM MDT | Severe Thunderstorm Warning | RIW | Johnson, Natrona | 64 min |
| Jul 6, 4:21 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 54 min |
| Jul 6, 4:47 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 43 min |
| Jul 6, 4:59 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 46 min |
| Jul 6, 5:04 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 41 min |
| Jul 6, 5:13 PM MDT | Severe Thunderstorm Warning | RIW | Fremont, Natrona | 47 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2008Every severe thunderstorm warning in 2008
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.