Alert archive / Wyoming / Severe Thunderstorm Warnings in 2019
Severe Thunderstorm Warning 59, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Jul 8, 2019, 5:09 PM MDT for Johnson County, Wyoming. It was in force for 51 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 8, 2019, 5:09 PM MDT (23:09 UTC)
- Expired
- Jul 8, 2019, 6:00 PM MDT
- In force
- 51 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
County Johnson County, WY
The radar
The Riverton/Lander radar (KRIW), 187 km from the middle of the area, began a volume at 23:11 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 |
|---|---|---|---|
| Jul 8, 1:25 PM MDT | Severe Thunderstorm Watch | SPC | 10 hr |
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 11.2 hours before the alert went out and 182 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
- 3185 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 56 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 Jul 8, 5:01 PM MDT, 8 minutes earlier.
Area forecast discussion, Jul 8, 5:01 PM MDT, 8 minutes before
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</html>Hazardous weather outlook, Jul 8, 2:05 PM MDT, 3 hours 4 minutes before
Hazardous Weather Outlook National Weather Service Riverton WY 205 PM MDT Mon Jul 8 2019 WYZ001>020-022>030-092015- Yellowstone National Park-Absaroka Mountains-Cody Foothills- North Big Horn Basin-Southwest Big Horn Basin- Southeast Big Horn Basin-Owl Creek and Bridger Mountains- Bighorn Mountains West-Bighorn Mountains Southeast- Northeast Johnson County-Southeast Johnson County- Teton and Gros Ventre Mountains-Jackson Hole- Wind River Mountains West-Wind River Mountains East- Upper Wind River Basin-Wind River Basin-Lander Foothills- Green Mountains and Rattlesnake Range- Natrona County Lower Elevations-Casper Mountain-Star Valley- Salt River and Wyoming Ranges-Upper Green River Basin Foothills- Upper Green River Basin-South Lincoln County- Rock Springs and Green River-Flaming Gorge-East Sweetwater County- 205 PM MDT Mon Jul 8 2019 This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...This afternoon and Tonight. Scattered thunderstorms through this evening. Some storms could be severe, especially across the Bighorn Basin to Johnson County and the surrounding mountains. Large hail, damaging winds and locally heavy rain will be the primary hazards, but an isolated tornado could occur. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Tuesday...Isolated thunderstorms possible in northern Wyoming. Friday through Sunday...Isolated to locally scattered thunderstorms. The best chance will be across the north. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. TEAM RIVERTON
In the hours before
Special weather statement, Jul 8, 3:58 PM MDT, 1 hour 11 minutes before
Special Weather Statement National Weather Service Riverton WY 358 PM MDT Mon Jul 8 2019 WYZ005-007-017>019-082230- Owl Creek and Bridger Mountains-Wind River Basin-Green Mountains and Rattlesnake Range-Southwest Big Horn Basin-Lander Foothills- 358 PM MDT Mon Jul 8 2019 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN HOT SPRINGS AND EAST CENTRAL FREMONT COUNTIES UNTIL 430 PM MDT... At 357 PM MDT, Doppler radar was tracking strong thunderstorms along a line extending from 12 miles west of Boysen State Park to 10 miles southeast of Hudson. Movement was east at 35 mph. Wind gusts up to 50 mph will be possible with these storms. Strong thunderstorms will be near... Sand Draw around 415 PM MDT. Other locations impacted by these storms include Arapahoe Elementary School, Midvale, St Stephens, Bonneville, Riverton Landfill, Fremont County Fairgrounds and Riverton Regional Airport. PRECAUTIONARY/PREPAREDNESS ACTIONS... If on or near Boysen Reservoir, get out of the water and move indoors or inside a vehicle. Remember, lightning can strike out to 10 miles from the parent thunderstorm. If you can hear thunder, you are close enough to be struck by lightning. Move to safe shelter now! Do not be caught on the water in a thunderstorm. && A Severe Thunderstorm Watch remains in effect until 900 PM MDT for central Wyoming. LAT...LON 4362 10783 4276 10781 4272 10861 4347 10863 TIME...MOT...LOC 2157Z 259DEG 29KT 4340 10843 4283 10841 TL
Special weather statement, Jul 8, 4:02 PM MDT, 1 hour 7 minutes before
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</html>Special weather statement, Jul 8, 4:31 PM MDT, 38 minutes before
Special Weather Statement National Weather Service Riverton WY 431 PM MDT Mon Jul 8 2019 WYZ005>007-082300- Owl Creek and Bridger Mountains-Southeast Big Horn Basin-Southwest Big Horn Basin- 431 PM MDT Mon Jul 8 2019 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN HOT SPRINGS AND CENTRAL WASHAKIE COUNTIES UNTIL 500 PM MDT... At 430 PM MDT, Doppler radar was tracking a strong thunderstorm over Lucerne, which is near Thermopolis, moving east at 30 mph. Half inch hail and wind gusts up to 50 mph will be possible with this storm. This storm will remain over mainly rural areas of southeastern Hot Springs and central Washakie Counties, including the following locations... Hot Springs County Fairgrounds and Hot Springs County Airport. A Severe Thunderstorm Watch remains in effect until 900 PM MDT for central Wyoming. LAT...LON 4354 10824 4373 10848 4393 10764 4365 10753 TIME...MOT...LOC 2230Z 256DEG 28KT 4371 10820 Hulme
Special weather statement, Jul 8, 4:33 PM MDT, 36 minutes before
Special Weather Statement National Weather Service Riverton WY 433 PM MDT Mon Jul 8 2019 WYZ019-020-082300- Green Mountains and Rattlesnake Range-Natrona County Lower Elevations- 433 PM MDT Mon Jul 8 2019 ...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL NATRONA COUNTY UNTIL 500 PM MDT... At 432 PM MDT, Doppler radar was tracking a strong thunderstorm near Ervay, which is 39 miles northeast of Jeffrey City, moving northeast at 30 mph. Half inch hail and winds in excess of 40 mph will be possible with this storm. This strong thunderstorm will be near... Waltman and Waltman Rest Area around 455 PM MDT. Powder River around 500 PM MDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... Heavy rainfall is also occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. && LAT...LON 4277 10728 4290 10745 4317 10717 4296 10689 TIME...MOT...LOC 2232Z 223DEG 28KT 4288 10729 McDonald
Special weather statement, Jul 8, 4:54 PM MDT, 15 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 7, 6:19 PM MDT | Special Weather Statement | RIW | Sweetwater | 26 min |
| Jul 7, 7:08 PM MDT | Special Weather Statement | RIW | Sweetwater | 22 min |
| Jul 8, 12:46 PM MDT | Special Weather Statement | RIW | 29 min | |
| Jul 8, 1:08 PM MDT | Tornado Warning | RIW | Hot Springs, Park | 37 min |
| Jul 8, 1:44 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn, Hot Springs, Park | 46 min |
| Jul 8, 1:49 PM MDT | Special Weather Statement | RIW | Teton | 26 min |
| Jul 8, 2:22 PM MDT | Special Weather Statement | RIW | Park | 23 min |
| Jul 8, 2:27 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn, Park | 16 min |
| Jul 8, 2:45 PM MDT | Special Weather Statement | RIW | Big Horn | 30 min |
| Jul 8, 2:47 PM MDT | Special Weather Statement | RIW | Park | 28 min |
| Jul 8, 2:56 PM MDT | Special Weather Statement | RIW | Fremont | 49 min |
| Jul 8, 2:57 PM MDT | Special Weather Statement | RIW | Hot Springs | 33 min |
| Jul 8, 3:13 PM MDT | Severe Thunderstorm Warning | RIW | Hot Springs, Washakie | 47 min |
| Jul 8, 3:28 PM MDT | Special Weather Statement | RIW | 32 min | |
| Jul 8, 3:29 PM MDT | Tornado Warning | RIW | Hot Springs, Washakie | 31 min |
| Jul 8, 3:32 PM MDT | Special Weather Statement | RIW | Lincoln | 28 min |
| Jul 8, 3:47 PM MDT | Special Weather Statement | RIW | Hot Springs | 28 min |
| Jul 8, 3:48 PM MDT | Special Weather Statement | RIW | Johnson | 27 min |
| Jul 8, 3:53 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn, Hot Springs, Washakie | 52 min |
| Jul 8, 3:58 PM MDT | Special Weather Statement | RIW | 32 min | |
| Jul 8, 4:02 PM MDT | Special Weather Statement | RIW | Natrona | 28 min |
| Jul 8, 4:12 PM MDT | Special Weather Statement | RIW | Hot Springs | 33 min |
| Jul 8, 4:26 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn, Hot Springs, Washakie | 49 min |
| Jul 8, 4:31 PM MDT | Special Weather Statement | RIW | Hot Springs, Washakie | 29 min |
| Jul 8, 4:33 PM MDT | Special Weather Statement | RIW | Natrona | 27 min |
| Jul 8, 4:39 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn, Washakie | 51 min |
| Jul 8, 4:54 PM MDT | Special Weather Statement | RIW | Johnson | 36 min |
| Jul 8, 5:16 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn, Johnson | 44 min |
| Jul 8, 5:24 PM MDT | Special Weather Statement | RIW | Big Horn | 36 min |
| Jul 8, 5:33 PM MDT | Special Weather Statement | RIW | Johnson | 27 min |
| Jul 8, 5:56 PM MDT | Special Weather Statement | RIW | 34 min | |
| Jul 8, 5:59 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 31 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2019Every severe thunderstorm warning in 2019
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.