Alert archive / Wyoming / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 33, NWS Riverton, WY

July 4, 2019Fremont County, Natrona County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jul 4, 2019, 3:37 AM MDT for Fremont County, Natrona County, Wyoming. It was in force for 38 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 4, 2019, 3:37 AM MDT (09:37 UTC)
Expired
Jul 4, 2019, 4:15 AM MDT
In force
38 min
Issued by
NWS Riverton, WY
Area
Storm-based polygon
Hail
1.5 in
Wind
60.0 mph

Counties Fremont County, WY, Natrona County, WY

The radar

The Riverton/Lander radar (KRIW), 62 km from the middle of the area, began a volume at 09:38 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.

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 3, 11:10 PM MDT, 4 hours 27 minutes earlier.

Area forecast discussion, Jul 3, 11:10 PM MDT, 4 hours 27 minutes before
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Hazardous weather outlook, Jul 3, 4:19 AM MDT, 23 hours 18 minutes before
Hazardous Weather Outlook
National Weather Service Riverton WY
419 AM MDT Wed Jul 3 2019

WYZ001>020-022>030-041200-
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-
419 AM MDT Wed Jul 3 2019

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight.

Isolated to scattered thunderstorms through this evening. A few
storms could be strong to possibly severe especially east of the
Continental Divide.

Elevated fire weather conditions across the extreme south this
afternoon.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Independence Day...Scattered afternoon and evening thunderstorms
across mainly northern and northwestern Wyoming. It will be driest
across southwest Wyoming.

.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 3, 11:58 PM MDT, 3 hours 39 minutes before
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Special weather statement, Jul 4, 12:35 AM MDT, 3 hours 2 minutes before
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Special weather statement, Jul 4, 12:37 AM MDT, 3 hours before
Special Weather Statement
National Weather Service Riverton WY
1237 AM MDT Thu Jul 4 2019

WYZ011-020-040715-
Southeast Johnson County-Natrona County Lower Elevations-
1237 AM MDT Thu Jul 4 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN JOHNSON AND
NORTHEASTERN NATRONA COUNTIES UNTIL 115 AM MDT...

At 1237 AM MDT, Doppler radar was tracking a strong thunderstorm near
Midwest, which is 23 miles southeast of Kaycee, moving northeast at
35 mph.

Penny size hail will be possible with this storm.

This strong thunderstorm will be near...
  Linch around 1255 AM MDT.

This includes Interstate 25 between mile markers 230 and 233.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4349 10604 4349 10608 4347 10608 4336 10627
      4349 10644 4383 10601 4373 10602 4351 10602
TIME...MOT...LOC 0637Z 226DEG 30KT 4348 10629

21
Special weather statement, Jul 4, 1:18 AM MDT, 2 hours 19 minutes before
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Special weather statement, Jul 4, 2:46 AM MDT, 51 minutes before
Special Weather Statement
National Weather Service Riverton WY
246 AM MDT Thu Jul 4 2019

WYZ017-040915-
Wind River Basin-
246 AM MDT Thu Jul 4 2019

...SPECIAL WEATHER STATEMENT...

At 243 AM MDT, Doppler radar was tracking a thunderstorm pushing
across Riverton, moving northeast at 40 mph.

The main hazard will be torrential rainfall. A quarter to half an
inch of rainfall could occur in less than 30 minutes. This will
cause ponding on area roads, and possibly minor flooding in low-
lying or poor drainage areas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4295 10829 4306 10849 4320 10830 4311 10807
TIME...MOT...LOC 0846Z 218DEG 49KT 4307 10833

21
Special weather statement, Jul 4, 2:59 AM MDT, 38 minutes before
Special Weather Statement
National Weather Service Riverton WY
259 AM MDT Thu Jul 4 2019

WYZ017-040930-
Wind River Basin-
259 AM MDT Thu Jul 4 2019

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL FREMONT COUNTY UNTIL
330 AM MDT...

At 258 AM MDT, Doppler radar was tracking a strong thunderstorm 13
miles north of Sand Draw, which is 14 miles southeast of Riverton,
moving northeast at 35 mph.

Nickel size hail and winds in excess of 30 mph will be possible with
this storm.

This strong thunderstorm will be near...
  Moneta around 330 AM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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 4283 10811 4296 10828 4314 10819 4329 10789
      4315 10766
TIME...MOT...LOC 0858Z 226DEG 31KT 4295 10812

21

The office that day

Everything else NWS Riverton, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 3, 6:15 PM MDTSpecial Weather StatementRIWJohnson30 min
Jul 3, 6:20 PM MDTSpecial Weather StatementRIWWashakie40 min
Jul 3, 6:42 PM MDTSpecial Weather StatementRIWJohnson33 min
Jul 3, 6:48 PM MDTSpecial Weather StatementRIWJohnson27 min
Jul 3, 7:04 PM MDTSevere Thunderstorm WarningRIWJohnson26 min
Jul 3, 7:06 PM MDTSevere Thunderstorm WarningRIWJohnson24 min
Jul 3, 7:24 PM MDTSpecial Weather StatementRIWJohnson21 min
Jul 3, 7:34 PM MDTSpecial Weather StatementRIWNatrona26 min
Jul 3, 7:46 PM MDTSevere Thunderstorm WarningRIWJohnson29 min
Jul 3, 8:13 PM MDTSevere Thunderstorm WarningRIWJohnson32 min
Jul 3, 8:17 PM MDTSevere Thunderstorm WarningRIWNatrona43 min
Jul 3, 9:22 PM MDTSevere Thunderstorm WarningRIWNatrona38 min
Jul 3, 11:58 PM MDTSpecial Weather StatementRIWNatrona47 min
Jul 4, 12:35 AM MDTSpecial Weather StatementRIW40 min
Jul 4, 12:37 AM MDTSpecial Weather StatementRIW38 min
Jul 4, 1:18 AM MDTSpecial Weather StatementRIWHot Springs27 min
Jul 4, 2:46 AM MDTSpecial Weather StatementRIWFremont29 min
Jul 4, 2:59 AM MDTSpecial Weather StatementRIWFremont31 min
Jul 4, 4:09 AM MDTSpecial Weather StatementRIW51 min
Jul 4, 4:14 AM MDTSevere Thunderstorm WarningRIWNatrona61 min
Jul 4, 4:54 AM MDTSpecial Weather StatementRIWJohnson66 min
Jul 4, 5:05 AM MDTSevere Thunderstorm WarningRIWNatrona55 min
Jul 4, 5:53 AM MDTSevere Thunderstorm WarningRIWNatrona37 min
Jul 4, 1:41 PM MDTSpecial Weather StatementRIWFremont34 min
Jul 4, 2:07 PM MDTSpecial Weather StatementRIW23 min
Jul 4, 2:26 PM MDTSpecial Weather StatementRIWFremont34 min
Jul 4, 2:36 PM MDTSpecial Weather StatementRIW24 min
Jul 4, 2:55 PM MDTSpecial Weather StatementRIWHot Springs35 min
Jul 4, 3:07 PM MDTSpecial Weather StatementRIWHot Springs23 min
Jul 4, 3:19 PM MDTSpecial Weather StatementRIWJohnson26 min
Jul 4, 3:20 PM MDTSpecial Weather StatementRIWFremont25 min
Jul 4, 3:22 PM MDTSpecial Weather StatementRIWJohnson23 min
Jul 4, 3:27 PM MDTSpecial Weather StatementRIWHot Springs33 min
Jul 4, 3:30 PM MDTSpecial Weather StatementRIWHot Springs30 min
Jul 4, 3:33 PM MDTSevere Thunderstorm WarningRIWJohnson42 min
Jul 4, 3:38 PM MDTSevere Thunderstorm WarningRIWHot Springs41 min
Jul 4, 3:47 PM MDTSevere Thunderstorm WarningRIWFremont, Hot Springs43 min
Jul 4, 3:51 PM MDTSpecial Weather StatementRIWNatrona24 min
Jul 4, 4:03 PM MDTSevere Thunderstorm WarningRIWNatrona42 min
Jul 4, 4:12 PM MDTSpecial Weather StatementRIWFremont33 min
Jul 4, 4:15 PM MDTSpecial Weather StatementRIW45 min
Jul 4, 4:15 PM MDTSevere Thunderstorm WarningRIWJohnson31 min
Jul 4, 4:20 PM MDTSpecial Weather StatementRIWWashakie25 min
Jul 4, 4:24 PM MDTSpecial Weather StatementRIWWashakie36 min
Jul 4, 4:31 PM MDTSpecial Weather StatementRIWHot Springs44 min
Jul 4, 4:38 PM MDTSevere Thunderstorm WarningRIWBig Horn, Washakie52 min
Jul 4, 4:45 PM MDTSpecial Weather StatementRIWNatrona30 min
Jul 4, 4:46 PM MDTSpecial Weather StatementRIWFremont29 min
Jul 4, 4:50 PM MDTSevere Thunderstorm WarningRIWHot Springs, Washakie40 min
Jul 4, 4:55 PM MDTSevere Thunderstorm WarningRIWFremont50 min
Jul 4, 5:05 PM MDTSevere Thunderstorm WarningRIWNatrona40 min
Jul 4, 5:25 PM MDTSpecial Weather StatementRIWHot Springs35 min
Jul 4, 5:25 PM MDTSevere Thunderstorm WarningRIWJohnson, Washakie50 min
Jul 4, 5:35 PM MDTTornado WarningRIWNatrona25 min
Jul 4, 5:52 PM MDTAreal Flood AdvisoryRIWHot Springs, Washakie3 hr
Jul 4, 5:53 PM MDTTornado WarningRIWJohnson, Washakie14 min
Jul 4, 5:59 PM MDTSpecial Weather StatementRIWNatrona31 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; radar from the NEXRAD Level II archive.