Alert archive / Nebraska / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 140, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 11, 2020, 3:52 PM MDT for Dawes County, Nebraska. It was in force for 38 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 11, 2020, 3:52 PM MDT (21:52 UTC)
- Expired
- Aug 11, 2020, 4:30 PM MDT
- In force
- 38 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Dawes County, NE
The radar
The Rapid City radar (KUDX), 158 km from the middle of the area, began a volume at 21:53 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
Rapid City, SD (KUNR), launched 12:00Z, 9.9 hours before the alert went out and 152 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
- 619 J/kg
- Mixed-layer CIN
- -348 J/kg
- Mixed-layer LCL
- 2036 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -10 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
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 11, 2:22 PM MDT, 1 hour 30 minutes earlier.
Area forecast discussion, Aug 11, 2:22 PM MDT, 1 hour 30 minutes before
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</html>Hazardous weather outlook, Aug 11, 11:00 AM MDT, 4 hours 52 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 1100 AM MDT Tue Aug 11 2020 WYZ101>105-109>115-121700- Converse County Lower Elevations-Niobrara County- North Laramie Range-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-Laramie Valley- 1100 AM MDT Tue Aug 11 2020 This hazardous weather outlook is for portions of east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Warm, dry and breezy conditions will develop across western Niobrara, Converse, Albany and Carbon Counties today. A Red Flag Warning is in effect until 8 PM this evening. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Warm, dry and windy weather will continue each day for areas along and west of the Laramie Range. A Fire Weather Watch is in effect Wednesday. .Spotter information statement... Spotter activation will not be required. NEZ002-003-019>021-054-055-095-096-WYZ106>108-116>119-121700- Dawes-Box Butte-Scotts Bluff County-Banner County-Morrill- Kimball County-Cheyenne-North Sioux-South Sioux- Central Laramie Range and Southwest Platte County- East Platte County-Goshen County-South Laramie Range- South Laramie Range Foothills-Central Laramie County- East Laramie County- 1100 AM MDT Tue Aug 11 2020 This hazardous weather outlook is for the western Nebraska Panhandle and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Isolated to widely scattered thunderstorms will develop along the Laramie Range early this afternoon and move east into the western Nebraska Panhandle through early evening. A few of the storms are expected to become severe with damaging downburst winds and large hail across the Panhandle. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Warm, dry and windy conditions are expected Thursday across the southeast Wyoming plains and western Nebraska Panhandle. Critical fire weather conditions will be possible late Thursday morning through the afternoon. .Spotter information statement... Spotter activation may be required across the western Nebraska Panhandle from 4 PM through 8 PM this evening.
In the hours before
Special weather statement, Aug 11, 2:58 PM MDT, 54 minutes before
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</html>Special weather statement, Aug 11, 3:34 PM MDT, 18 minutes before
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</html>Special weather statement, Aug 11, 3:35 PM MDT, 17 minutes before
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</html>Special weather statement, Aug 11, 3:44 PM MDT, 8 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 |
|---|---|---|---|---|
| Aug 11, 2:08 AM MDT | Fire Weather Watch | CYS | 11 hr | |
| Aug 11, 1:16 PM MDT | Special Weather Statement | CYS | Laramie | 44 min |
| Aug 11, 1:20 PM MDT | Red Flag Warning | CYS | 31 hr | |
| Aug 11, 5:11 PM MDT | Special Weather Statement | CYS | 49 min | |
| Aug 11, 2:21 PM MDT | Special Weather Statement | CYS | Sioux | 39 min |
| Aug 11, 2:58 PM MDT | Special Weather Statement | CYS | Dawes | 47 min |
| Aug 11, 3:11 PM MDT | Special Weather Statement | CYS | Kimball | 34 min |
| Aug 11, 3:17 PM MDT | Special Weather Statement | CYS | Morrill | 43 min |
| Aug 11, 3:34 PM MDT | Special Weather Statement | CYS | Dawes | 41 min |
| Aug 11, 3:35 PM MDT | Special Weather Statement | CYS | Box Butte | 40 min |
| Aug 11, 4:12 PM MDT | Special Weather Statement | CYS | Box Butte | 48 min |
| Aug 11, 4:20 PM MDT | Special Weather Statement | CYS | Deuel | 40 min |
| Aug 11, 4:23 PM MDT | Special Weather Statement | CYS | Box Butte | 52 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 2020Every severe thunderstorm warning in 2020
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.