Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 132, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 26, 2021, 4:08 PM MDT for Albany County, Carbon County, Wyoming. It was in force for 37 min. 4 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 26, 2021, 4:08 PM MDT (22:08 UTC)
- Expired
- Aug 26, 2021, 4:45 PM MDT
- In force
- 37 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Albany County, WY, Carbon County, WY
The radar
The Cheyenne radar (KCYS), 136 km from the middle of the area, began a volume at 22:08 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 26, 4:22 PM MDT | TSTM WND GST 59 | 10 Ssw Hanna, WY | MESONET STATION WY16 10.5 SW HANNA (WYDOT). |
| Aug 26, 4:26 PM MDT | TSTM WND GST 63 | 7 Nw Elk Mountain, WY | MESONET STATION WY18 HALLECK RIDGE (WYDOT). |
| Aug 26, 4:36 PM MDT | TSTM WND GST 65 | 7 Nw Elk Mountain, WY | MESONET STATION WY18 HALLECK RIDGE (WYDOT). |
| Aug 26, 4:46 PM MDT | TSTM WND GST 60 | 7 Nw Elk Mountain, WY | MESONET STATION WY18 HALLECK RIDGE (WYDOT). |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 10.1 hours before the alert went out and 232 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
- 22 J/kg
- Mixed-layer CIN
- -272 J/kg
- Mixed-layer LCL
- 2403 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 147 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
686 WUUS55 KCYS 262208 SVRCYS WYC001-007-262245- /O.NEW.KCYS.SV.W.0132.210826T2208Z-210826T2245Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Cheyenne WY 408 PM MDT Thu Aug 26 2021 The National Weather Service in Cheyenne has issued a * Severe Thunderstorm Warning for... East central Carbon County in south central Wyoming... Central Albany County in southeastern Wyoming... * Until 445 PM MDT. * At 408 PM MDT, a severe thunderstorm was located over Elk Mountain, or 43 miles east of Rawlins, moving northeast at 35 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Medicine Bow, Rock River, Elk Mountain and Arlington. This includes Interstate 80 in Wyoming between mile markers 241 and 277. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4152 10617 4169 10681 4196 10633 4180 10585 TIME...MOT...LOC 2208Z 231DEG 29KT 4169 10640 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Mokry
1 follow-up statement
952 WWUS55 KCYS 262236 SVSCYS Severe Weather Statement National Weather Service Cheyenne WY 436 PM MDT Thu Aug 26 2021 WYC001-007-262245- /O.CON.KCYS.SV.W.0132.000000T0000Z-210826T2245Z/ Carbon WY-Albany WY- 436 PM MDT Thu Aug 26 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM MDT FOR EAST CENTRAL CARBON AND CENTRAL ALBANY COUNTIES... At 435 PM MDT, a severe thunderstorm was located near Medicine Bow, or 46 miles northwest of Laramie, moving northeast at 35 mph. Halleck Ridge sensor along I-80 measured 63 mph gust at 4:26 PM MDT. HAZARD...60 mph wind gusts. SOURCE...Wyoming Department of Transportation Sensor. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Medicine Bow, Rock River, Elk Mountain and Arlington. This includes Interstate 80 in Wyoming between mile markers 241 and 277. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4152 10617 4169 10681 4196 10633 4180 10585 TIME...MOT...LOC 2235Z 231DEG 29KT 4183 10617 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Mokry
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 1:56 AM MDT | Fire Weather Watch | CYS | 12 hr | |
| Aug 26, 1:27 PM MDT | Red Flag Warning | CYS | 31 hr | |
| Aug 26, 2:39 PM MDT | Special Weather Statement | CYS | Carbon | 36 min |
| Aug 26, 3:26 PM MDT | Special Weather Statement | CYS | Carbon | 34 min |
| Aug 26, 3:39 PM MDT | Special Weather Statement | CYS | Platte | 36 min |
| Aug 26, 4:23 PM MDT | Special Weather Statement | CYS | Platte | 37 min |
| Aug 26, 4:44 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Carbon | 31 min |
| Aug 26, 5:27 PM MDT | Special Weather Statement | CYS | Albany | 33 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.