Alert archive / Wyoming / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 385, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Sep 9, 2023, 11:32 PM MDT for Goshen County, Wyoming. It was in force for 58 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
- Sep 9, 2023, 11:32 PM MDT (05:32 UTC)
- Expired
- Sep 10, 2023, 12:30 AM MDT
- In force
- 58 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Hail
- 2.5 in
- Wind
- 60.0 mph
County Goshen County, WY
The radar
The Cheyenne radar (KCYS), 111 km from the middle of the area, began a volume at 05:34 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 |
|---|---|---|---|
| Sep 9, 6:00 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 5.5 hours before the alert went out and 330 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
- 877 J/kg
- Mixed-layer CIN
- -197 J/kg
- Mixed-layer LCL
- 1461 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- -17 m²/s²
- 0-3 km storm-relative helicity
- 0 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -3.0
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 Sep 9, 10:53 PM MDT, 39 minutes earlier.
Area forecast discussion, Sep 9, 10:53 PM MDT, 39 minutes before
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</html>Hazardous weather outlook, Sep 9, 4:49 AM MDT, 18 hours 43 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 449 AM MDT Sat Sep 9 2023 WYZ101-103>107-109>119-101100- 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-East Laramie County- 449 AM MDT Sat Sep 9 2023 This hazardous weather outlook is for portions of east central Wyoming and most of southeast Wyoming. .DAY ONE...TODAY AND TONIGHT There is a slight chance of showers and thunderstorms this afternoon as a surface cold front slides south towards the Interstate 80 corridor this afternoon. Showers and thunderstorms will increase in coverage this evening and tonight. A few thunderstorms may contain hail and strong gusty winds. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY Periods of light to moderate rainfall with occasional thunderstorms expected for Sunday and Monday. A few thunderstorms may contain small hail and gusty winds Sunday. .Spotter information statement... Spotter activation is not expected at this time. NEZ002-003-019>021-054-055-095-096-WYZ102-108-101100- 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- 449 AM MDT Sat Sep 9 2023 This hazardous weather outlook is for portions of the western Nebraska panhandle and east central Wyoming near the Nebraska border. .DAY ONE...TODAY AND TONIGHT Showers and thunderstorms will increase in coverage late this afternoon and this evening. A few of these storms may become severe with brief heavy rainfall, strong gusty winds, and hail possible as they move southeast. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY Periods of light rainfall with occasional thunderstorms expected for Sunday and Monday. .Spotter information statement... Spotter activation is not expected at this time.
In the hours before
Local storm report, Sep 9, 9:28 PM MDT, 2 hours 4 minutes before
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</html>Local storm report, Sep 9, 9:30 PM MDT, 2 hours 2 minutes before
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</html>Local storm report, Sep 9, 9:41 PM MDT, 1 hour 51 minutes before
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</html>Local storm report, Sep 9, 9:44 PM MDT, 1 hour 48 minutes before
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</html>Local storm report, Sep 9, 9:58 PM MDT, 1 hour 34 minutes before
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</html>Local storm report, Sep 9, 11:06 PM MDT, 26 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 |
|---|---|---|---|---|
| Sep 9, 6:21 PM MDT | Special Weather Statement | CYS | Converse | 39 min |
| Sep 9, 6:54 PM MDT | Special Weather Statement | CYS | Platte | 51 min |
| Sep 9, 6:59 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Niobrara, Platte | 61 min |
| Sep 9, 7:47 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 43 min |
| Sep 9, 7:57 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 63 min |
| Sep 9, 8:28 PM MDT | Special Weather Statement | CYS | Converse | 47 min |
| Sep 9, 8:39 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Niobrara, Platte | 66 min |
| Sep 9, 9:05 PM MDT | Special Weather Statement | CYS | Goshen | 40 min |
| Sep 9, 9:12 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 50 min |
| Sep 9, 9:43 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Converse, Goshen, Niobrara, Platte | 62 min |
| Sep 9, 10:40 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 65 min |
| Sep 10, 12:24 AM MDT | Severe Thunderstorm Warning | CYS | Goshen | 22 min |
| Sep 10, 7:23 AM MDT | Special Weather Statement | CYS | Goshen | 37 min |
| Sep 10, 3:46 PM MDT | Special Weather Statement | CYS | Converse | 59 min |
| Sep 10, 5:13 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Converse | 30 min |
| Sep 10, 9:53 AM MDT | Special Weather Statement | CYS | Cheyenne | 37 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.