Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 42, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 8, 2021, 9:08 PM MDT for Laramie County, Wyoming. It was in force for 52 min. 2 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
- Jun 8, 2021, 9:08 PM MDT (03:08 UTC)
- Expired
- Jun 8, 2021, 10:00 PM MDT
- In force
- 52 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Laramie County, WY
The radar
The Cheyenne radar (KCYS), 8 km from the middle of the area, began a volume at 03:08 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 |
|---|---|---|---|
| Jun 8, 9:29 PM MDT | HAIL 0.7 | 1 N Fox Farm-College, WY | |
| Jun 8, 9:30 PM MDT | HAIL 0.7 | 1 N Fox Farm-College, WY |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 3.1 hours before the alert went out and 189 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
- 424 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 3769 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 155 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
The text
As transmitted.
295
WUUS55 KCYS 090308
SVRCYS
WYC021-090400-
/O.NEW.KCYS.SV.W.0042.210609T0308Z-210609T0400Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
908 PM MDT Tue Jun 8 2021
The National Weather Service in Cheyenne has issued a
* Severe Thunderstorm Warning for...
South central Laramie County in southeastern Wyoming...
* Until 1000 PM MDT.
* At 908 PM MDT, a severe thunderstorm was located near South
Greeley, or near Cheyenne, moving east at 10 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
South Cheyenne, South Greeley, Warren AFB, Frontier Park, Warren
Af Base, Ranchettes, Fox Farm-College and South Greeley High.
This includes the following highways...
Interstate 25 in Wyoming between mile markers 1 and 12.
Interstate 80 in Wyoming between mile markers 355 and 372.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4113 10494 4122 10464 4101 10458 4100 10468
4100 10496
TIME...MOT...LOC 0308Z 262DEG 10KT 4108 10489
HAIL...1.00IN
WIND...60MPH
$$
Hammer2 follow-up statements
843
WWUS55 KCYS 090347
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
947 PM MDT Tue Jun 8 2021
WYC021-090400-
/O.CON.KCYS.SV.W.0042.000000T0000Z-210609T0400Z/
Laramie WY-
947 PM MDT Tue Jun 8 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM MDT
FOR SOUTH CENTRAL LARAMIE COUNTY...
At 947 PM MDT, a severe thunderstorm was located near South Greeley,
or near Cheyenne, moving east at 10 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Cheyenne.
This includes Interstate 80 in Wyoming between mile markers 366 and
372.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4122 10464 4101 10458 4100 10468 4100 10480
4116 10473
TIME...MOT...LOC 0347Z 262DEG 10KT 4110 10475
HAIL...1.00IN
WIND...60MPH
$$
Hammer573
WWUS55 KCYS 090357
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
957 PM MDT Tue Jun 8 2021
WYC021-090406-
/O.EXP.KCYS.SV.W.0042.000000T0000Z-210609T0400Z/
Laramie WY-
957 PM MDT Tue Jun 8 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL LARAMIE COUNTY
WILL EXPIRE AT 1000 PM MDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However small hail
and heavy rain are still possible with this thunderstorm.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Cheyenne.
LAT...LON 4122 10464 4101 10458 4100 10468 4100 10480
4116 10473
TIME...MOT...LOC 0356Z 262DEG 10KT 4110 10472
$$
HammerThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 6:14 PM MDT | Special Weather Statement | CYS | Laramie | 31 min |
| Jun 8, 6:45 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 45 min |
| Jun 8, 7:27 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 48 min |
| Jun 8, 7:30 PM MDT | Flash Flood Warning | CYS | Laramie | 3 hr |
| Jun 8, 8:21 PM MDT | Special Weather Statement | CYS | Niobrara | 54 min |
| Jun 8, 8:29 PM MDT | Special Weather Statement | CYS | Laramie | 46 min |
| Jun 8, 8:35 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 55 min |
| Jun 8, 8:36 PM MDT | Special Weather Statement | CYS | Laramie | 39 min |
| Jun 8, 9:03 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie | 42 min |
| Jun 8, 9:33 PM MDT | Special Weather Statement | CYS | Niobrara | 57 min |
| Jun 8, 10:20 PM MDT | Areal Flood Advisory | CYS | Laramie | 3 hr |
| Jun 8, 10:26 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 49 min |
| Jun 8, 11:15 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 45 min |
| Jun 9, 2:11 PM MDT | High Wind Watch | CYS | Albany, Converse, Goshen, Laramie, Niobrara, Platte | 12 hr |
| Jun 9, 2:11 PM MDT | High Wind Warning | CYS | Albany, Carbon, Converse, Goshen, Laramie, Niobrara and 1 more | 39 hr |
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.