Alert archive / Wyoming / Special Weather Statements in 2021
Special Weather Statement, NWS Cheyenne, WY
NWS Cheyenne, WY issued this special weather statement at May 17, 2021, 1:34 PM MDT for Laramie County, Wyoming. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 17, 2021, 1:34 PM MDT (19:34 UTC)
- Expired
- May 17, 2021, 2:00 PM MDT
- In force
- 26 min
- Issued by
- NWS Cheyenne, WY
County Laramie County, WY
The radar
The Cheyenne radar (KCYS), 15 km from the middle of the area, began a volume at 19:35 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
Denver, CO (KDNR), launched 12:00Z, 7.6 hours before the alert went out and 208 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
- 44 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 779 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- 12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at May 17, 11:10 AM MDT, 2 hours 24 minutes earlier.
Area forecast discussion, May 17, 11:10 AM MDT, 2 hours 24 minutes before
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</html>Hazardous weather outlook, May 17, 5:42 AM MDT, 7 hours 52 minutes before
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<div class="status" id="status">Temporary Notice</div>
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</html>In the hours before
Special weather statement, May 17, 1:34 PM MDT, 0 minutes before
Special Weather Statement National Weather Service Cheyenne WY 134 PM MDT Mon May 17 2021 WYZ117-172000- South Laramie Range Foothills- 134 PM MDT Mon May 17 2021 ...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN LARAMIE COUNTY... At 133 PM MDT, a strong thunderstorm was located 7 miles west of Warren AFB, or 10 miles west of Cheyenne, moving northwest at 10 mph. Winds in excess of 30 mph and pea size hail are likely with this storm. This storm will remain over mainly rural areas of southwestern Laramie County. If outdoors, consider seeking shelter inside a building. LAT...LON 4115 10490 4112 10502 4122 10511 4127 10495 TIME...MOT...LOC 1933Z 153DEG 7KT 4117 10499 Jamski
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 17, 5:36 AM MDT | Dense Fog Advisory | CYS | Albany, Laramie | 5 hr |
| May 17, 1:48 PM MDT | Areal Flood Advisory | CYS | Albany, Carbon | 3 hr |
| May 17, 2:05 PM MDT | Flash Flood Warning | CYS | Albany, Carbon | 2 hr |
| May 17, 4:47 PM MDT | Special Weather Statement | CYS | Laramie | 28 min |
| May 17, 5:22 PM MDT | Special Weather Statement | CYS | 38 min |
Nearby
Special Weather Statements in Wyoming, 2021Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.