Alert archive / Wyoming / Special Weather Statements in 2021
Special Weather Statement, NWS Cheyenne, WY
NWS Cheyenne, WY issued this special weather statement at Jun 13, 2021, 11:27 PM MDT for Laramie County, Wyoming. It was in force for 48 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
- Jun 13, 2021, 11:27 PM MDT (05:27 UTC)
- Expired
- Jun 14, 2021, 12:15 AM MDT
- In force
- 48 min
- Issued by
- NWS Cheyenne, WY
County Laramie County, WY
The radar
The Cheyenne radar (KCYS), 46 km from the middle of the area, began a volume at 05:27 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 00:00Z, 5.5 hours before the alert went out and 187 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
- 1095 J/kg
- Mixed-layer CIN
- -143 J/kg
- Mixed-layer LCL
- 2628 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 22 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 Jun 13, 10:59 PM MDT, 28 minutes earlier.
Area forecast discussion, Jun 13, 10:59 PM MDT, 28 minutes before
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</html>Hazardous weather outlook, Jun 13, 4:25 AM MDT, 19 hours 2 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 425 AM MDT Sun Jun 13 2021 WYZ104-105-109>115-141030- 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- 425 AM MDT Sun Jun 13 2021 This hazardous weather outlook is for portions of south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Very warm temperatures and dry conditions will maintain elevated fire weather concerns. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY Very warm temperatures and dry conditions will maintain elevated fire weather concerns. .Spotter information statement... Spotter activation will not be needed. NEZ002-003-019>021-054-055-095-096-WYZ101>103-106>108-116>119- 141030- 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-South Laramie Range- South Laramie Range Foothills-Central Laramie County- East Laramie County- 425 AM MDT Sun Jun 13 2021 This hazardous weather outlook is for portions of panhandle Nebraska...east central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Chances of showers and strong to briefly severe thunderstorm Sunday afternoon through late Sunday night. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY The probability for widespread hazardous weather is low. .Spotter information statement... Spotter activation will not be needed.
In the hours before
Local storm report, Jun 13, 9:30 PM MDT, 1 hour 57 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
930 PM MDT SUN JUN 13 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0925 PM HEAVY RAIN 1 SE CRAWFORD 42.68N 103.40W
06/13/2021 M2.50 INCH DAWES NE PUBLIC
&&
AWSpecial weather statement, Jun 13, 9:43 PM MDT, 1 hour 44 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
943 PM MDT Sun Jun 13 2021
NEZ021-140430-
Morrill NE-
943 PM MDT Sun Jun 13 2021
...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL MORRILL COUNTY UNTIL
1030 PM MDT...
At 943 PM MDT, Doppler radar was tracking a strong thunderstorm 13
miles northeast of The Intersection Of Highway 385 And 92, or 25
miles south of Alliance, moving east at 10 mph.
Nickel size hail will be possible with this storm.
This storm will remain over mainly rural areas of east central
Morrill County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Cheyenne.
&&
A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
the Panhandle of Nebraska.
LAT...LON 4162 10284 4179 10291 4188 10268 4176 10267
4174 10264 4164 10264
TIME...MOT...LOC 0343Z 252DEG 8KT 4173 10279
HammerSpecial weather statement, Jun 13, 9:47 PM MDT, 1 hour 40 minutes before
Special Weather Statement National Weather Service Cheyenne WY 947 PM MDT Sun Jun 13 2021 WYZ118-119-140430- Central Laramie County WY-East Laramie County WY- 947 PM MDT Sun Jun 13 2021 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN LARAMIE COUNTY UNTIL 1030 PM MDT... At 947 PM MDT, Doppler radar was tracking a strong thunderstorm 8 miles west of Gun Barrel, or 25 miles northeast of Cheyenne, moving east at 10 mph. Penny size hail will be possible with this storm. Locations impacted include... Gun Barrel and Meriden Rest Area. PRECAUTIONARY/PREPAREDNESS ACTIONS... To report severe weather, contact your nearest law enforcement agency. They will relay your report to the National Weather Service office in Cheyenne. && A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for southeastern Wyoming. LAT...LON 4140 10460 4153 10458 4155 10424 4133 10423 TIME...MOT...LOC 0347Z 271DEG 10KT 4144 10451 Hammer
Special weather statement, Jun 13, 10:10 PM MDT, 1 hour 17 minutes before
Special Weather Statement National Weather Service Cheyenne WY 1010 PM MDT Sun Jun 13 2021 WYZ118-140500- Central Laramie County WY- 1010 PM MDT Sun Jun 13 2021 ...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL LARAMIE COUNTY UNTIL 1100 PM MDT... At 1010 PM MDT, Doppler radar was tracking a strong thunderstorm near Whitaker, or 20 miles north of Cheyenne, moving east at 5 mph. Penny size hail will be possible with this storm. This storm will remain over mainly rural areas of north central Laramie County. PRECAUTIONARY/PREPAREDNESS ACTIONS... To report severe weather, contact your nearest law enforcement agency. They will relay your report to the National Weather Service office in Cheyenne. && LAT...LON 4139 10484 4154 10483 4151 10456 4135 10459 TIME...MOT...LOC 0410Z 291DEG 6KT 4144 10474 Hammer
Special weather statement, Jun 13, 10:51 PM MDT, 36 minutes before
Special Weather Statement National Weather Service Cheyenne WY 1051 PM MDT Sun Jun 13 2021 WYZ118-119-140515- Central Laramie County WY-East Laramie County WY- 1051 PM MDT Sun Jun 13 2021 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN LARAMIE COUNTY UNTIL 1115 PM MDT... At 1051 PM MDT, Doppler radar was tracking a strong thunderstorm 7 miles west of Gun Barrel, or 26 miles northeast of Cheyenne, moving southeast at 10 mph. Nickel size hail will be possible with this storm. Locations impacted include... Gun Barrel. PRECAUTIONARY/PREPAREDNESS ACTIONS... Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. To report severe weather, contact your nearest law enforcement agency. They will relay your report to the National Weather Service office in Cheyenne. && LAT...LON 4142 10460 4154 10453 4148 10423 4130 10438 TIME...MOT...LOC 0451Z 295DEG 10KT 4145 10449 Hammer
Special weather statement, Jun 13, 11:27 PM MDT, 0 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 |
|---|---|---|---|---|
| Jun 13, 9:47 PM MDT | Special Weather Statement | CYS | Laramie | 43 min |
| Jun 13, 10:10 PM MDT | Special Weather Statement | CYS | Laramie | 50 min |
| Jun 13, 10:51 PM MDT | Special Weather Statement | CYS | Laramie | 24 min |
| Jun 13, 6:42 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Dawes, Sioux | 48 min |
| Jun 13, 7:27 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Dawes, Sioux | 48 min |
| Jun 13, 7:32 PM MDT | Severe Thunderstorm Warning | CYS | Dawes | 43 min |
| Jun 13, 7:38 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Cheyenne, Morrill | 52 min |
| Jun 13, 8:52 PM MDT | Severe Thunderstorm Warning | CYS | Morrill | 53 min |
| Jun 13, 9:43 PM MDT | Special Weather Statement | CYS | Morrill | 47 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.