Alert archive / Wyoming / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 336, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 3, 2023, 3:39 PM MDT for Laramie 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
- Aug 3, 2023, 3:39 PM MDT (21:39 UTC)
- Expired
- Aug 3, 2023, 4:30 PM MDT
- In force
- 51 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
County Laramie County, WY
The radar
The Cheyenne radar (KCYS), 20 km from the middle of the area, began a volume at 21:42 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 |
|---|---|---|---|
| Aug 3, 2:57 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 9.7 hours before the alert went out and 343 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
- 156 J/kg
- Mixed-layer CIN
- -148 J/kg
- Mixed-layer LCL
- 944 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 Aug 3, 3:39 PM MDT, 0 minutes earlier.
Area forecast discussion, Aug 3, 3:39 PM MDT, 0 minutes before
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</html>Hazardous weather outlook, Aug 3, 2:39 AM MDT, 13 hours before
Hazardous Weather Outlook National Weather Service Cheyenne WY 239 AM MDT Thu Aug 3 2023 WYZ101-103>107-109>118-040845- Converse County Lower Elevations-North Laramie Range- Ferris/Seminoe/Shirley Mountains-Shirley Basin- Central Laramie Range and Southwest Platte County- East Platte County-Central Carbon County- North Snowy Range Foothills-Southwest Carbon County- Sierra Madre Range-Upper North Platte River Basin-Snowy Range- Laramie Valley-South Laramie Range-South Laramie Range Foothills- Central Laramie County- 239 AM MDT Thu Aug 3 2023 This hazardous weather outlook is for portions of east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Scattered to numerous showers, and scattered thunderstorms will occur this afternoon and evening. A few of the storms along and east of Interstate 25 will likely produce small hail and gusty winds. Brief heavy rainfall may occur from some thunderstorms north of a Wheatland to Torrington line. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY There is a chance of afternoon and evening thunderstorms Friday through Monday, with lesser chances for Tuesday and Wednesday. .Spotter information statement... Spotter activation will not be needed. NEZ002-003-019>021-054-055-095-096-WYZ102-108-119-040845- Dawes County-Box Butte County-Scotts Bluff County-Banner County- Morrill County-Kimball County-Cheyenne County- Northern Sioux County-Southern Sioux County-Niobrara County- Goshen County-East Laramie County- 239 AM MDT Thu Aug 3 2023 This hazardous weather outlook is for portions of panhandle Nebraska...east central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Scattered to numerous showers, and scattered thunderstorms will occur this afternoon and evening, when there is a slight chance for severe storms. Some storms this afternoon and evening may become severe, producing quarter size hail or larger, or winds in excess of 60 mph. A few storms north of a Torrington to Alliance line may produce locally heavy rainfall. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY There is a chance of afternoon and evening thunderstorms Friday through Monday, with lesser chances for Tuesday and Wednesday. .Spotter information statement... Spotter activation will not be needed. Rubin
In the hours before
Special weather statement, Aug 3, 12:42 PM MDT, 2 hours 57 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
1242 PM MDT Thu Aug 3 2023
WYZ116-117-031915-
South Laramie Range WY-South Laramie Range Foothills WY-
1242 PM MDT Thu Aug 3 2023
...A strong thunderstorm will impact portions of southwestern Laramie
County through 115 PM MDT...
At 1242 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles southeast of Crystal Lake Campground, or 15 miles west of
Cheyenne, moving northeast at 5 mph.
HAZARD...Winds in excess of 40 mph and half inch 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...
Crystal Lake Campground and Crystal Lake Reservoir.
This includes Interstate 80 in Wyoming between mile markers 342 and
353.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
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.
&&
LAT...LON 4101 10515 4116 10521 4121 10499 4105 10494
TIME...MOT...LOC 1842Z 244DEG 4KT 4110 10508
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
HammerSpecial weather statement, Aug 3, 1:14 PM MDT, 2 hours 25 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
114 PM MDT Thu Aug 3 2023
WYZ117-118-032000-
Central Laramie County WY-South Laramie Range Foothills WY-
114 PM MDT Thu Aug 3 2023
...A strong thunderstorm will impact portions of southwestern Laramie
County through 200 PM MDT...
At 114 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles west of Warren AFB, or 10 miles west of Cheyenne, moving
northeast at 10 mph.
HAZARD...Winds in excess of 40 mph and half inch 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...
Cheyenne, South Greeley, Ranchettes, Warren AFB, Frontier Park, North
Cheyenne, Warren Af Base, Fox Farm-College and South Greeley High.
This includes the following highways...
Interstate 25 in Wyoming between mile markers 7 and 21.
Interstate 80 in Wyoming between mile markers 347 and 367.
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.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Cheyenne.
&&
LAT...LON 4105 10506 4119 10514 4135 10494 4121 10471
4111 10470
TIME...MOT...LOC 1914Z 242DEG 10KT 4115 10500
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
HammerLocal storm report, Aug 3, 2:38 PM MDT, 1 hour 1 minute before
Preliminary Local Storm Report
National Weather Service Cheyenne WY
238 PM MDT Thu Aug 3 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0500 PM Flood 10 SSW Muddy Gap 42.25N 107.51W
08/02/2023 Carbon WY Emergency Mngr
Late Report from Carbon County emergency
management. Bairoil Gas Plant flooded and is
suspending operations until the water is
pumped out. Flooded nearby roadways reported
as well.
&&
TTLocal storm report, Aug 3, 3:32 PM MDT, 7 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 |
|---|---|---|---|---|
| Aug 2, 6:23 PM MDT | Special Weather Statement | CYS | Albany | 67 min |
| Aug 2, 10:11 PM MDT | Special Weather Statement | CYS | Carbon | 34 min |
| Aug 2, 11:01 PM MDT | Special Weather Statement | CYS | Carbon | 44 min |
| Aug 2, 11:29 PM MDT | Special Weather Statement | CYS | 46 min | |
| Aug 3, 12:17 AM MDT | Special Weather Statement | CYS | Albany | 43 min |
| Aug 3, 1:01 AM MDT | Special Weather Statement | CYS | Albany | 44 min |
| Aug 3, 12:42 PM MDT | Special Weather Statement | CYS | Laramie | 33 min |
| Aug 3, 1:14 PM MDT | Special Weather Statement | CYS | Laramie | 46 min |
| Aug 3, 3:00 PM MDT | Flash Flood Warning | CYS | Laramie | 3 hr |
| Aug 3, 4:02 PM MDT | Special Weather Statement | CYS | Niobrara | 28 min |
| Aug 3, 4:07 PM MDT | Special Weather Statement | CYS | Laramie | 53 min |
| Aug 3, 5:09 PM MDT | Special Weather Statement | CYS | Niobrara | 36 min |
| Aug 2, 6:01 PM MDT | Special Weather Statement | CYS | Box Butte, Morrill | 44 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.