Alert archive / Wyoming / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 187, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 29, 2023, 12:56 PM MDT for Converse County, Wyoming. It was in force for 52 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 29, 2023, 12:56 PM MDT (18:56 UTC)
- Expired
- Jun 29, 2023, 1:48 PM MDT
- In force
- 52 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Hail
- 1.75 in
- Wind
- 60.0 mph
County Converse County, WY
The radar
The Cheyenne radar (KCYS), 210 km from the middle of the area, began a volume at 18:56 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
Riverton, WY (KRIW), launched 12:00Z, 6.9 hours before the alert went out and 235 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
- 51 J/kg
- Mixed-layer CIN
- -125 J/kg
- Mixed-layer LCL
- 1483 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -33 m²/s²
- 0-3 km storm-relative helicity
- 89 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 29, 11:33 AM MDT, 1 hour 23 minutes earlier.
Area forecast discussion, Jun 29, 11:33 AM MDT, 1 hour 23 minutes before
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</html>Hazardous weather outlook, Jun 29, 4:49 AM MDT, 8 hours 7 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 449 AM MDT Thu Jun 29 2023 NEZ002-003-019>021-054-055-095-096-WYZ101>103-106>108-115>119- 301100- 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- Central Laramie Range and Southwest Platte County- East Platte County-Goshen County-Laramie Valley- South Laramie Range-South Laramie Range Foothills- Central Laramie County-East Laramie County- 449 AM MDT Thu Jun 29 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 thunderstorms are expected across southeast Wyoming and the western Nebraska Panhandle this afternoon through late tonight. A few storms are likely to become severe, with very large and destructive hail larger than golf balls possible with the most intense storms. Localized flash flooding, damaging wind gusts, and isolated tornadoes are also possible. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY An unsettled weather pattern will contribute to daily chances for showers and thunderstorms across the region. Occasional chances for strong to severe thunderstorms are expected. .Spotter information statement... Spotters are encouraged to report significant weather to the National Weather Service in Cheyenne. WYZ104-105-109>114-301100- 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- 449 AM MDT Thu Jun 29 2023 This hazardous weather outlook is for portions of south central Wyoming. .DAY ONE...TODAY AND TONIGHT Scattered to numerous showers and thunderstorms are expected across southeast Wyoming and the western Nebraska Panhandle this afternoon through late tonight. A few stronger storms may produce small hail, gusty winds, and locally heavy rainfall. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY The probability for widespread hazardous weather is low. .Spotter information statement... Spotter activation is not anticipated.
In the hours before
Special weather statement, Jun 29, 12:16 PM MDT, 40 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
1216 PM MDT Thu Jun 29 2023
WYZ103-291900-
North Laramie Range WY-
1216 PM MDT Thu Jun 29 2023
...A strong thunderstorm will impact portions of southwestern
Converse County through 100 PM MDT...
At 1216 PM MDT, Doppler radar was tracking a strong thunderstorm near
Boxelder, or 24 miles southwest of Douglas, moving southwest at 15
mph.
HAZARD...Wind gusts of 50 to 55 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 strong thunderstorm will be near...
Campbell Creek Campground around 1250 PM MDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4272 10577 4264 10558 4244 10573 4245 10603
TIME...MOT...LOC 1816Z 032DEG 11KT 4256 10580
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...55 MPH
RubinThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 28, 6:20 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 40 min |
| Jun 28, 6:46 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 59 min |
| Jun 28, 7:17 PM MDT | Special Weather Statement | CYS | Laramie | 43 min |
| Jun 28, 7:47 PM MDT | Special Weather Statement | CYS | Converse | 58 min |
| Jun 28, 8:15 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 45 min |
| Jun 28, 8:18 PM MDT | Special Weather Statement | CYS | Albany | 42 min |
| Jun 29, 12:16 PM MDT | Special Weather Statement | CYS | Converse | 44 min |
| Jun 29, 1:35 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Platte | 40 min |
| Jun 29, 1:59 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 46 min |
| Jun 29, 2:02 PM MDT | Special Weather Statement | CYS | Platte | 43 min |
| Jun 29, 2:12 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Laramie, Platte | 63 min |
| Jun 29, 2:13 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Platte | 47 min |
| Jun 29, 2:27 PM MDT | Special Weather Statement | CYS | Albany | 48 min |
| Jun 29, 2:41 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 49 min |
| Jun 29, 2:55 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Goshen, Niobrara, Platte | 50 min |
| Jun 29, 2:56 PM MDT | Flash Flood Warning | CYS | Converse | 3 hr |
| Jun 29, 3:11 PM MDT | Severe Thunderstorm Warning | CYS | Laramie, Platte | 64 min |
| Jun 29, 3:16 PM MDT | Special Weather Statement | CYS | Albany | 44 min |
| Jun 29, 3:16 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 29 min |
| Jun 29, 3:21 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 24 min |
| Jun 29, 3:22 PM MDT | Tornado Warning | CYS | Laramie, Platte | 23 min |
| Jun 29, 3:44 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Niobrara, Platte | 46 min |
| Jun 29, 3:54 PM MDT | Special Weather Statement | CYS | Carbon | 51 min |
| Jun 29, 4:01 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie, Platte | 74 min |
| Jun 29, 4:04 PM MDT | Flash Flood Warning | CYS | Niobrara | 91 min |
| Jun 29, 4:28 PM MDT | Special Weather Statement | CYS | Goshen | 32 min |
| Jun 29, 4:44 PM MDT | Special Weather Statement | CYS | Goshen | 31 min |
| Jun 29, 5:04 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie | 71 min |
| Jun 29, 5:30 PM MDT | Areal Flood Advisory | CYS | Goshen, Laramie | 3 hr |
| Jun 29, 5:52 PM MDT | Special Weather Statement | CYS | Laramie | 38 min |
| Jun 29, 5:57 PM MDT | Special Weather Statement | CYS | Albany | 48 min |
| Jun 28, 6:09 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne, Kimball | 81 min |
| Jun 28, 6:14 PM MDT | Tornado Warning | CYS | Kimball | 31 min |
| Jun 28, 6:18 PM MDT | Special Weather Statement | CYS | Dawes | 42 min |
| Jun 28, 6:43 PM MDT | Tornado Warning | CYS | Kimball | 32 min |
| Jun 28, 6:58 PM MDT | Special Weather Statement | CYS | Cheyenne | 47 min |
| Jun 28, 6:58 PM MDT | Tornado Warning | CYS | Cheyenne, Kimball | 32 min |
| Jun 28, 7:10 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 65 min |
| Jun 28, 7:40 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne, Kimball | 45 min |
| Jun 28, 7:43 PM MDT | Flash Flood Warning | CYS | Kimball | 63 min |
| Jun 28, 7:53 PM MDT | Special Weather Statement | CYS | Banner | 52 min |
| Jun 28, 10:46 PM MDT | Special Weather Statement | CYS | Kimball | 29 min |
| Jun 29, 4:12 PM MDT | Special Weather Statement | CYS | Sioux | 33 min |
| Jun 29, 4:50 PM MDT | Special Weather Statement | CYS | Sioux | 25 min |
| Jun 29, 5:13 PM MDT | Special Weather Statement | CYS | Dawes | 32 min |
| Jun 29, 5:46 PM MDT | Special Weather Statement | CYS | Box Butte, Dawes | 59 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.