Alert archive / Wyoming / Severe Thunderstorm Warnings in 2014
Severe Thunderstorm Warning 61, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Aug 18, 2014, 4:01 PM MDT for Big Horn County, Hot Springs County, Park County, Wyoming. It was in force for 29 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 18, 2014, 4:01 PM MDT (22:01 UTC)
- Expired
- Aug 18, 2014, 4:30 PM MDT
- In force
- 29 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Big Horn County, WY, Hot Springs County, WY, Park County, WY
The radar
The Riverton/Lander radar (KRIW), 133 km from the middle of the area, began a volume at 22:03 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, 10.0 hours before the alert went out and 134 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
- 28 J/kg
- Mixed-layer CIN
- -221 J/kg
- Mixed-layer LCL
- 1966 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- -22 m²/s²
- 0-3 km storm-relative helicity
- 98 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 18, 3:17 PM MDT, 44 minutes earlier.
Area forecast discussion, Aug 18, 3:17 PM MDT, 44 minutes before
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</html>Hazardous weather outlook, Aug 18, 5:00 AM MDT, 11 hours 1 minute before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 500 AM MDT MON AUG 18 2014 WYZ001>020-022>030-191200- 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 MON AUG 18 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...ISOLATED TO WIDELY SCATTERED THUNDERSTORMS IN THE AFTERNOON AND EVENING...SOME WITH GUSTY WINDS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY TUESDAY AND WEDNESDAY...SCATTERED THUNDERSTORMS INCREASING THROUGH THE AFTERNOON AND INTO THE EVENING. SOME OF THE STORMS IN JOHNSON AND NATRONA COUNTY COULD BECOME STRONG WITH GUSTY WINDS AND SMALL HAIL. HEAVY RAIN POSSIBLE BY TUESDAY NIGHT. THURSDAY THROUGH SATURDAY...SCATTERED MOUNTAIN THUNDERSTORMS EACH AFTERNOON AND EVENING WITH MORE ISOLATED THUNDERSTORMS ELSEWHERE. SUNDAY...ISOLATED MAINLY MOUNTAIN THUNDERSTORMS. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT ANY WIND GUSTS OVER 50 MPH. TEAM RIVERTON
In the hours before
Special weather statement, Aug 18, 2:21 PM MDT, 1 hour 40 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 221 PM MDT MON AUG 18 2014 WYZ005>007-182100- OWL CREEK AND BRIDGER MOUNTAINS WY-SOUTHEAST BIG HORN BASIN WY-SOUTHWEST BIG HORN BASIN WY- 221 PM MDT MON AUG 18 2014 ...SIGNIFICANT WEATHER ADVISORY FOR WESTERN WASHAKIE AND CENTRAL HOT SPRINGS COUNTIES UNTIL 300 PM MDT... AT 218 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR HWY JCT 170 AND 174...OR 20 MILES WEST OF THERMOPOLIS...MOVING EAST AT 25 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 45 MPH ARE EXPECTED WITH THIS STORM. THIS STORM WILL BE NEAR... MISSOURI FLAT RD AROUND 235 PM MDT. STATE HWY 120 MILE MARKER 10 AND HWY JCT 170 AND 120 AROUND 245 PM MDT. U.S. HWY 20/789 MILE MARKER 140...LUCERNE AND KIRBY AROUND 300 PM MDT. REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4388 10805 4355 10802 4360 10868 4378 10872 TIME...MOT...LOC 2021Z 261DEG 22KT 4370 10857 BRANHAM
Special weather statement, Aug 18, 2:46 PM MDT, 1 hour 15 minutes before
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</html>Special weather statement, Aug 18, 2:59 PM MDT, 1 hour 2 minutes before
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</html>Special weather statement, Aug 18, 3:33 PM MDT, 28 minutes before
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</html>Special weather statement, Aug 18, 3:37 PM MDT, 24 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 18, 2:21 PM MDT | Special Weather Statement | RIW | Hot Springs | 39 min |
| Aug 18, 2:59 PM MDT | Special Weather Statement | RIW | Hot Springs | 31 min |
| Aug 18, 3:33 PM MDT | Special Weather Statement | RIW | 42 min | |
| Aug 18, 4:27 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn, Hot Springs, Park, Washakie | 33 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2014Every severe thunderstorm warning in 2014
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.