Alert archive / Wyoming / Severe Thunderstorm Warnings in 2024
Severe Thunderstorm Warning 165, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 12, 2024, 1:12 PM MDT for Laramie County, Wyoming. It was in force for 33 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 12, 2024, 1:12 PM MDT (19:12 UTC)
- Expired
- Aug 12, 2024, 1:45 PM MDT
- In force
- 33 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Laramie County, WY
The radar
The Cheyenne radar (KCYS), 20 km from the middle of the area, began a volume at 19:11 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 nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 7.2 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
- 1 J/kg
- Mixed-layer CIN
- -368 J/kg
- Mixed-layer LCL
- 989 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 74 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 Aug 12, 11:39 AM MDT, 1 hour 33 minutes earlier.
Area forecast discussion, Aug 12, 11:39 AM MDT, 1 hour 33 minutes before
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</html>Hazardous weather outlook, Aug 12, 3:24 AM MDT, 9 hours 48 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 324 AM MDT Mon Aug 12 2024 NEZ002-003-019>021-054-055-095-096-WYZ101>119-130930- Dawes County-Box Butte County-Scotts Bluff County-Banner County- Morrill County-Kimball County-Cheyenne County- Northern Sioux County-Southern Sioux County- Converse County Lower Elevations-Niobrara County- North Laramie Range-Ferris/Seminoe/Shirley Mountains- Shirley Basin-Central Laramie Range and Southwest Platte County- East Platte County-Goshen 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-East Laramie County- 324 AM MDT Mon Aug 12 2024 This hazardous weather outlook is for portions of panhandle Nebraska...east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT - Areas of dense fog will reduce visibility along portions of the Interstate 80 corridor through mid morning. - Scattered to numerous showers and thunderstorms are expected to develop this afternoon. Storms will have the potential to produce torrential rainfall, gusty winds, and isolated large hail. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY - An active pattern continues through the week ahead with near normal temperatures and daily chances for afternoon and evening showers and thunderstorms. .Spotter information statement... Spotter activation will not be needed.
In the hours before
Special weather statement, Aug 12, 12:53 PM MDT, 19 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
1253 PM MDT Mon Aug 12 2024
WYZ106-107-117-118-121930-
East Platte County WY-
Central Laramie Range and Southwest Platte County WY-
Central Laramie County WY-South Laramie Range Foothills WY-
1253 PM MDT Mon Aug 12 2024
...A STRONG THUNDERSTORM WILL IMPACT NORTH CENTRAL LARAMIE AND SOUTH
CENTRAL PLATTE COUNTIES THROUGH 130 PM MDT...
At 1252 PM MDT, Doppler radar was tracking a strong thunderstorm 10
miles southwest of Chugwater, or 28 miles south of Wheatland, moving
east at 25 mph.
HAZARD...Wind gusts up to 50 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Chugwater and Slater.
This includes Interstate 25 in Wyoming between mile markers 41 and
62.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4156 10502 4168 10508 4187 10480 4155 10467
TIME...MOT...LOC 1852Z 254DEG 21KT 4164 10495
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH
DeweyThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 2:16 AM MDT | Dense Fog Advisory | CYS | Laramie | 7 hr |
| Aug 12, 12:53 PM MDT | Special Weather Statement | CYS | Platte | 37 min |
| Aug 12, 1:55 PM MDT | Special Weather Statement | CYS | Laramie | 35 min |
| Aug 12, 2:22 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie | 23 min |
| Aug 12, 2:43 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie | 32 min |
| Aug 12, 3:08 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie | 37 min |
| Aug 12, 3:38 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 37 min |
| Aug 12, 3:56 PM MDT | Flash Flood Warning | CYS | Laramie | 93 min |
| Aug 12, 4:16 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 29 min |
| Aug 12, 4:54 PM MDT | Special Weather Statement | CYS | 51 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2024Every severe thunderstorm warning in 2024
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.