Alert archive / Wyoming / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 21, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at May 11, 2007, 6:23 PM MDT for Laramie County, Wyoming. It was in force for 37 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
- May 11, 2007, 6:23 PM MDT (00:23 UTC)
- Expired
- May 11, 2007, 7:00 PM MDT
- In force
- 37 min
- Issued by
- NWS Cheyenne, WY
- Area
- Counties, with a storm outline in the text
County Laramie County, WY
The radar
The Cheyenne radar (KCYS), 5 km from the middle of the area, began a volume at 00:30 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 |
|---|---|---|---|
| May 11, 6:28 PM MDT | TSTM WND GST 60 | 2 Se Cheyenne, WY | |
| May 11, 6:45 PM MDT | TSTM WND GST 60 | 10 E Cheyenne, WY | TWO WEIGHTED CONSTRUCTION BARRELS BLOWN OVER NEAR I-80 PORT OF ENTRY |
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, 0.4 hours before the alert went out and 199 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3892 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KCYS 120023 SVRCYS WYC021-120100- /O.NEW.KCYS.SV.W.0021.070512T0023Z-070512T0100Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 623 PM MDT FRI MAY 11 2007 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL LARAMIE COUNTY IN SOUTHEAST WYOMING... THIS INCLUDES THE CITY OF CHEYENNE... * UNTIL 700 PM MDT * AT 609 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR CHEYENNE...AND MOVING NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... HWY 85 AT LODGEPOLE CREEK BY 630 PM MDT... HWY 85 AT COUNTY ROAD 222 BY 640 PM MDT... IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR DAMAGING WINDS...LARGE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. TAKE COVER IN A STURDY STRUCTURE UNTIL THE STORM PASSES. REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN CHEYENNE AT 1-800-269-6220. LAT...LON 4125 10501 4105 10493 4108 10448 4136 10459 $$ KMD
2 follow-up statements
000 WWUS55 KCYS 120049 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 647 PM MDT FRI MAY 11 2007 WYC021-120100- /O.CON.KCYS.SV.W.0021.000000T0000Z-070512T0100Z/ LARAMIE WY- 647 PM MDT FRI MAY 11 2007 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM MDT FOR CENTRAL LARAMIE COUNTY... AT 630 PM MDT...A SEVERE THUNDERSTORM WAS REPORTED PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR I-80 MM 370...OR ABOUT 9 MILES EAST OF CHEYENNE...MOVING EAST AT 20 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... I-80 MM 377 BY 655 PM MDT... REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN CHEYENNE AT 1-800-269-6220. LAT...LON 4127 10470 4102 10467 4103 10436 4127 10437 $$ KMD
000 WWUS55 KCYS 120103 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 659 PM MDT FRI MAY 11 2007 WYC021-120109- /O.EXP.KCYS.SV.W.0021.000000T0000Z-070512T0100Z/ LARAMIE WY- 659 PM MDT FRI MAY 11 2007 ...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL LARAMIE COUNTY EXPIRES AT 700 PM MDT... THE SEVERE THUNDERSTORM WARNING FOR CENTRAL LARAMIE COUNTY HAS BEEN ALLOWED TO EXPIRE. THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING FOR CENTRAL LARAMIE COUNTY HAS WEAKENED AND NO LONGER POSES A SEVERE WEATHER THREAT FOR CENTRAL LARAMIE COUNTY. WIND GUSTS ACROSS EASTERN LARAMIE COUNTY WILL BE UP TO 40 TO 50 MPH THROUGH 730 PM AS THE STORM CONTINUES TO WEAKEN. IF SEVERE WEATHER WAS OBSERVED...PLEASE CONTACT YOUR LOCAL LAW ENFORCEMENT AGENCY AND ASK THEM TO RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN CHEYENNE. LAT...LON 4127 10470 4102 10467 4103 10436 4127 10437 $$ KMD
Nearby
Severe Thunderstorm Warnings in Wyoming, 2007Every severe thunderstorm warning in 2007
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.