Alert archive / Wyoming / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 49, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 27, 2017, 5:40 PM MDT for Albany County, Laramie County, Platte County, Wyoming. It was in force for 42 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 27, 2017, 5:40 PM MDT (23:40 UTC)
- Expired
- Jun 27, 2017, 6:22 PM MDT
- In force
- 42 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Albany County, WY, Laramie County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 66 km from the middle of the area, began a volume at 23:41 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 (KDEN), launched 12:00Z, 11.7 hours before the alert went out and 258 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
- 34 J/kg
- Mixed-layer CIN
- -526 J/kg
- Mixed-layer LCL
- 2742 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 95 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
861
WUUS55 KCYS 272340
SVRCYS
WYC001-021-031-280045-
/O.NEW.KCYS.SV.W.0049.170627T2340Z-170628T0045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
540 PM MDT TUE JUN 27 2017
The National Weather Service in Cheyenne has issued a
* Severe Thunderstorm Warning for...
Southeastern Albany County in southeastern Wyoming...
Northwestern Laramie County in southeastern Wyoming...
Southwestern Platte County in southeastern Wyoming...
* Until 645 PM MDT
* At 539 PM MDT, a severe thunderstorm was located near Horse Creek,
or 15 miles east of Laramie, moving east at 40 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated. At 522 pm MDT...A peak wind gust to 90
mph was reported at the Laramie Airport.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* This severe thunderstorm will be near,
Horse Creek around 550 PM MDT.
This includes Interstate 80 in Wyoming between mile markers 299 and
326.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4111 10583 4178 10579 4182 10505 4126 10505
TIME...MOT...LOC 2339Z 261DEG 34KT 4138 10530
HAIL...<.75IN
WIND...70MPH
$$
Rubin2 follow-up statements
364
WWUS55 KCYS 272356
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
556 PM MDT TUE JUN 27 2017
WYC001-021-031-280045-
/O.CON.KCYS.SV.W.0049.000000T0000Z-170628T0045Z/
Albany WY-Laramie WY-Platte WY-
556 PM MDT TUE JUN 27 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM MDT
FOR SOUTHEASTERN ALBANY...NORTHWESTERN LARAMIE AND SOUTHWESTERN
PLATTE COUNTIES...
At 556 PM MDT, a severe thunderstorm was located near Horse Creek, or
23 miles northwest of Cheyenne, moving east at 40 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
this severe thunderstorm will remain over mainly rural areas of
southeastern Albany...northwestern Laramie and southwestern Platte
Counties.
This includes Interstate 80 in Wyoming between mile markers 315 and
326.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4116 10559 4179 10551 4182 10505 4126 10505
TIME...MOT...LOC 2356Z 261DEG 34KT 4141 10508
HAIL...<.75IN
WIND...70MPH
$$
Rubin261
WWUS55 KCYS 280022
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
622 PM MDT TUE JUN 27 2017
WYC001-021-031-280032-
/O.CAN.KCYS.SV.W.0049.000000T0000Z-170628T0045Z/
Albany WY-Laramie WY-Platte WY-
622 PM MDT TUE JUN 27 2017
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ALBANY...
NORTHWESTERN LARAMIE AND SOUTHWESTERN PLATTE COUNTIES IS CANCELLED...
The storm which prompted the warning has moved out of the area.
Therefore the warning has been cancelled.
LAT...LON 4116 10559 4179 10551 4182 10505 4126 10505
TIME...MOT...LOC 0020Z 261DEG 34KT 4145 10476
$$
RubinThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 27, 12:47 PM MDT | Red Flag Warning | CYS | 6 hr | |
| Jun 27, 1:13 PM MDT | Special Weather Statement | CYS | Laramie | 47 min |
| Jun 27, 2:40 PM MDT | Special Weather Statement | CYS | Converse | 50 min |
| Jun 27, 3:14 PM MDT | Special Weather Statement | CYS | Niobrara | 46 min |
| Jun 27, 3:35 PM MDT | Special Weather Statement | CYS | Niobrara | 40 min |
| Jun 27, 3:57 PM MDT | Special Weather Statement | CYS | Niobrara | 48 min |
| Jun 27, 4:54 PM MDT | Special Weather Statement | CYS | Converse | 51 min |
| Jun 27, 5:24 PM MDT | Special Weather Statement | CYS | Albany | 51 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2017Every severe thunderstorm warning in 2017
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.