Alert archive / Wyoming / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 73, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 20, 2023, 10:06 PM MDT for Converse County, Niobrara County, Wyoming. It was in force for 39 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 20, 2023, 10:06 PM MDT (04:06 UTC)
- Expired
- Jun 20, 2023, 10:45 PM MDT
- In force
- 39 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 60.0 mph
Counties Converse County, WY, Niobrara County, WY
The radar
The Cheyenne radar (KCYS), 208 km from the middle of the area, began a volume at 04:09 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
N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 4.1 hours before the alert went out and 419 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
- 2113 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 1242 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 54 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 Cheyenne, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 20, 8:56 PM MDT, 1 hour 10 minutes earlier.
Area forecast discussion, Jun 20, 8:56 PM MDT, 1 hour 10 minutes before
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</html>Hazardous weather outlook, Jun 20, 3:04 PM MDT, 7 hours 2 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 304 PM MDT Tue Jun 20 2023 WYZ101>103-106>108-116>119-212115- Converse County Lower Elevations-Niobrara County- North Laramie Range- Central Laramie Range and Southwest Platte County- East Platte County-Goshen County-South Laramie Range- South Laramie Range Foothills-Central Laramie County- East Laramie County- 304 PM MDT Tue Jun 20 2023 This hazardous weather outlook is for portions of east central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT Widely scattered late afternoon and early evening thunderstorms will develop over east central Wyoming. A few strong storms producing small hail and gusty winds are possible. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Strong to severe thunderstorms possible Wednesday afternoon with large hail and damaging winds possible. Daily chances for afternoon and evening showers and thunderstorms will continue through Friday. .Spotter information statement... Spotter activation will not be required. NEZ002-003-019>021-054-055-095-096-212115- Dawes County-Box Butte County-Scotts Bluff County-Banner County- Morrill County-Kimball County-Cheyenne County- Northern Sioux County-Southern Sioux County- 304 PM MDT Tue Jun 20 2023 This hazardous weather outlook is for western portions of the Nebraska Panhandle. .DAY ONE...THIS AFTERNOON AND TONIGHT Widely scattered thunderstorms will develop late this afternoon and early evening. Isolated severe thunderstorms producing large hail and damaging winds are possible. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Strong to severe thunderstorms possible Wednesday afternoon with large hail and damaging winds possible. Daily chances for afternoon and evening showers and thunderstorms will continue through Friday. .Spotter information statement... Spotter activation may be required late this afternoon and early evening. WYZ104-105-109>115-212115- Ferris/Seminoe/Shirley Mountains-Shirley Basin- Central Carbon County-North Snowy Range Foothills- Southwest Carbon County-Sierra Madre Range- Upper North Platte River Basin-Snowy Range-Laramie Valley- 304 PM MDT Tue Jun 20 2023 This hazardous weather outlook is for portions of south central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY The probability for widespread hazardous weather is low. .Spotter information statement... Spotter activation will not be required. MAJ
In the hours before
Special weather statement, Jun 20, 6:30 PM MDT, 3 hours 36 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
630 PM MDT Tue Jun 20 2023
NEZ002-095-096-210115-
Dawes NE-North Sioux NE-South Sioux NE-
630 PM MDT Tue Jun 20 2023
...A strong thunderstorm will impact portions of southwestern Dawes
and east central Sioux Counties through 715 PM MDT...
At 630 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles northeast of Agate Bed National Monument, or 38 miles northeast
of Torrington, moving north-northeast at 20 mph.
HAZARD...Winds in excess of 30 mph and penny size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Fort Robinson.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
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.
A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
the Panhandle of Nebraska.
&&
LAT...LON 4235 10352 4239 10375 4269 10379 4267 10339
TIME...MOT...LOC 0030Z 198DEG 17KT 4250 10371
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...30 MPH
WillsSpecial weather statement, Jun 20, 6:39 PM MDT, 3 hours 27 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
639 PM MDT Tue Jun 20 2023
WYZ101-210215-
Converse County Lower Elevations WY-
639 PM MDT Tue Jun 20 2023
...A strong thunderstorm will impact portions of northwestern
Converse County through 815 PM MDT...
At 639 PM MDT, Doppler radar was tracking a strong thunderstorm near
Antelope Hills, or 13 miles north of Casper, moving northeast at 30
mph.
HAZARD...Wind gusts up to 50 mph and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
This storm will remain over mainly rural areas of northwestern
Converse County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
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 4301 10573 4299 10607 4350 10607 4350 10522
TIME...MOT...LOC 0039Z 246DEG 25KT 4302 10623
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH
WillsLocal storm report, Jun 20, 7:32 PM MDT, 2 hours 34 minutes before
Preliminary Local Storm Report
National Weather Service Cheyenne WY
732 PM MDT Tue Jun 20 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0650 PM Hail 10.5 SE Harrison 42.58N 103.74W
06/20/2023 M1.75 inch Sioux NE Trained Spotter
&&Special weather statement, Jun 20, 7:51 PM MDT, 2 hours 15 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
751 PM MDT Tue Jun 20 2023
NEZ002-095-210245-
Dawes NE-North Sioux NE-
751 PM MDT Tue Jun 20 2023
...A strong thunderstorm will impact portions of northwestern Dawes
and northeastern Sioux Counties through 845 PM MDT...
At 751 PM MDT, Doppler radar was tracking a strong thunderstorm 9
miles southeast of Montrose, or 30 miles west of Chadron, moving
north at 15 mph.
HAZARD...Winds in excess of 30 mph and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
This storm will remain over mainly rural areas of northwestern Dawes
and northeastern Sioux Counties.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
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.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Cheyenne.
A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
the Panhandle of Nebraska.
&&
LAT...LON 4276 10352 4280 10366 4300 10362 4300 10325
TIME...MOT...LOC 0151Z 196DEG 12KT 4281 10361
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...30 MPH
WillsSpecial weather statement, Jun 20, 7:55 PM MDT, 2 hours 11 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
755 PM MDT Tue Jun 20 2023
WYZ101-102-210300-
Converse County Lower Elevations WY-Niobrara County WY-
755 PM MDT Tue Jun 20 2023
...A strong thunderstorm will impact portions of northwestern
Niobrara and northeastern Converse Counties through 900 PM MDT...
At 755 PM MDT, Doppler radar was tracking a strong thunderstorm 15
miles west of Bill, or 33 miles north of Douglas, moving northeast at
20 mph.
HAZARD...Winds in excess of 40 mph and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Bill and Dull Center.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
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 4329 10469 4320 10529 4320 10568 4350 10568
4350 10441
TIME...MOT...LOC 0155Z 246DEG 18KT 4323 10557
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH
WillsLocal storm report, Jun 20, 8:29 PM MDT, 1 hour 37 minutes before
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</html>The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 6:39 PM MDT | Special Weather Statement | CYS | Converse | 96 min |
| Jun 20, 7:55 PM MDT | Special Weather Statement | CYS | 65 min | |
| Jun 20, 8:04 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 41 min |
| Jun 20, 11:13 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Goshen, Niobrara, Platte | 47 min |
| Jun 20, 11:52 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Niobrara, Platte | 38 min |
| Jun 21, 2:02 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Carbon | 43 min |
| Jun 21, 2:11 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 49 min |
| Jun 21, 2:23 PM MDT | Special Weather Statement | CYS | 37 min | |
| Jun 21, 2:40 PM MDT | Severe Thunderstorm Warning | CYS | Carbon | 35 min |
| Jun 21, 2:45 PM MDT | Severe Thunderstorm Warning | CYS | Albany | 45 min |
| Jun 21, 2:54 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 51 min |
| Jun 21, 2:59 PM MDT | Tornado Warning | CYS | Albany | 31 min |
| Jun 21, 3:29 PM MDT | Tornado Warning | CYS | Albany | 15 min |
| Jun 21, 3:39 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 51 min |
| Jun 21, 3:46 PM MDT | Special Weather Statement | CYS | Platte | 44 min |
| Jun 21, 4:14 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Platte | 46 min |
| Jun 21, 4:39 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 51 min |
| Jun 21, 4:54 PM MDT | Flash Flood Warning | CYS | Laramie | 3 hr |
| Jun 21, 5:00 PM MDT | Special Weather Statement | CYS | Platte | 45 min |
| Jun 21, 5:10 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Niobrara | 50 min |
| Jun 21, 5:17 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Platte | 43 min |
| Jun 21, 5:27 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Niobrara | 28 min |
| Jun 21, 5:29 PM MDT | Severe Thunderstorm Warning | CYS | Laramie, Platte | 19 min |
| Jun 21, 5:36 PM MDT | Severe Thunderstorm Warning | CYS | Platte | 39 min |
| Jun 21, 5:41 PM MDT | Special Weather Statement | CYS | Niobrara | 34 min |
| Jun 21, 5:52 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Niobrara | 20 min |
| Jun 20, 6:30 PM MDT | Special Weather Statement | CYS | Sioux | 45 min |
| Jun 20, 6:37 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 38 min |
| Jun 20, 7:05 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 16 min |
| Jun 20, 7:15 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 45 min |
| Jun 20, 7:51 PM MDT | Special Weather Statement | CYS | Dawes | 54 min |
| Jun 21, 1:29 AM MDT | Special Weather Statement | CYS | Sioux | 46 min |
| Jun 21, 12:49 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 41 min |
| Jun 21, 1:08 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 52 min |
| Jun 21, 1:11 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 49 min |
| Jun 21, 1:24 PM MDT | Tornado Warning | CYS | Cheyenne | 36 min |
| Jun 21, 2:00 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 30 min |
| Jun 21, 2:22 PM MDT | Special Weather Statement | CYS | Morrill | 23 min |
| Jun 21, 2:27 PM MDT | Special Weather Statement | CYS | Kimball | 33 min |
| Jun 21, 2:48 PM MDT | Severe Thunderstorm Warning | CYS | Kimball | 42 min |
| Jun 21, 3:09 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Scotts Bluff | 51 min |
| Jun 21, 3:19 PM MDT | Special Weather Statement | CYS | Banner | 41 min |
| Jun 21, 3:57 PM MDT | Special Weather Statement | CYS | Scotts Bluff | 33 min |
| Jun 21, 4:22 PM MDT | Special Weather Statement | CYS | Sioux | 23 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2023Every severe thunderstorm warning in 2023
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.