Alert archive / Wyoming / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 5, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Apr 26, 2012, 8:20 PM MDT for Converse County, Niobrara County, Platte County, Wyoming. It was in force for 25 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
- Apr 26, 2012, 8:20 PM MDT (02:20 UTC)
- Expired
- Apr 26, 2012, 8:45 PM MDT
- In force
- 25 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Converse County, WY, Niobrara County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 164 km from the middle of the area, began a volume at 02:21 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 00:00Z, 2.3 hours before the alert went out and 229 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
- 35 J/kg
- Mixed-layer CIN
- -110 J/kg
- Mixed-layer LCL
- 1002 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 184 m²/s²
- 0-3 km storm-relative helicity
- 516 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted, in the capitals the NWS used until 2016.
465 WUUS55 KCYS 270220 SVRCYS WYC009-027-031-270245- /O.NEW.KCYS.SV.W.0005.120427T0220Z-120427T0245Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 820 PM MDT THU APR 26 2012 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEASTERN CONVERSE COUNTY IN EAST CENTRAL WYOMING... SOUTHWESTERN NIOBRARA COUNTY IN EAST CENTRAL WYOMING... NORTHEASTERN PLATTE COUNTY IN SOUTHEAST WYOMING... * UNTIL 845 PM MDT * AT 817 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR TWO MOON CAMPGROUND...OR 29 MILES NORTH OF WHEATLAND...AND MOVING NORTHEAST AT 25 MPH. * LOCATIONS IMPACTED INCLUDE... LOST SPRINGS. THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 108 AND 113. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS. && LAT...LON 4280 10496 4267 10459 4240 10491 4245 10505 TIME...MOT...LOC 0220Z 204DEG 20KT 4249 10492 WIND...HAIL 60MPH 1.00IN $$ HAMMER/RUBIN
1 follow-up statement
049 WWUS55 KCYS 270239 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 839 PM MDT THU APR 26 2012 WYC009-027-031-270249- /O.EXP.KCYS.SV.W.0005.000000T0000Z-120427T0245Z/ NIOBRARA WY-CONVERSE WY-PLATTE WY- 839 PM MDT THU APR 26 2012 ...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PLATTE... SOUTHEASTERN CONVERSE AND SOUTHWESTERN NIOBRARA COUNTIES WILL EXPIRE AT 845 PM MDT... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY. HOWEVER...GUSTY WINDS ARE STILL POSSIBLE WITH THIS THUNDERSTORM. LAT...LON 4280 10496 4267 10459 4240 10491 4245 10505 TIME...MOT...LOC 0239Z 204DEG 20KT 4259 10486 $$ HAMMER/RUBIN
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 6:40 PM MDT | Special Weather Statement | CYS | Albany | 65 min |
| Apr 26, 7:43 PM MDT | Special Weather Statement | CYS | Platte | 47 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2012Every severe thunderstorm warning in 2012
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.