Alert archive / Wyoming / Tornado Warnings in 2007
Tornado Warning 4, NWS Cheyenne, WY
NWS Cheyenne, WY issued this tornado warning at May 20, 2007, 11:27 AM MDT for Laramie County, Wyoming. It was in force for 24 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
- May 20, 2007, 11:27 AM MDT (17:27 UTC)
- Expired
- May 20, 2007, 11:51 AM MDT
- In force
- 24 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), 0 km from the middle of the area, began a volume at 17:28 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 12:00Z, 5.5 hours before the alert went out and 195 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
- 2 J/kg
- Mixed-layer CIN
- -394 J/kg
- Mixed-layer LCL
- 1955 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- -11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WFUS55 KCYS 201728 TORCYS WYC021-201800- /O.NEW.KCYS.TO.W.0004.070520T1727Z-070520T1800Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 1127 AM MDT SUN MAY 20 2007 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * TORNADO WARNING FOR... SOUTH CENTRAL LARAMIE COUNTY IN SOUTHEAST WYOMING... THIS INCLUDES THE CITY OF CHEYENNE... * UNTIL NOON MDT * AT 1119 AM MDT...LOCAL LAW ENFORCEMENT REPORTED A TORNADO NEAR CHEYENNE...MOVING EAST AT 10 MPH. * THE TORNADO WILL BE NEAR... CHEYENNE BY 1145 AM MDT... NORTH CHEYENNE BY 1155 AM MDT... MOVE INTO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. ABANDON MOBILE HOMES AND VEHICLES. REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN CHEYENNE AT 1-800-269-6220. LAT...LON 4121 10495 4103 10492 4104 10460 4127 10464 $$ SOWKO
2 follow-up statements
000 WWUS55 KCYS 201737 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 1134 AM MDT SUN MAY 20 2007 WYC021-201800- /O.CON.KCYS.TO.W.0004.000000T0000Z-070520T1800Z/ LARAMIE WY- 1134 AM MDT SUN MAY 20 2007 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL NOON MDT FOR SOUTH CENTRAL LARAMIE COUNTY... AT 1128 AM MDT...LOCAL LAW ENFORCEMENT REPORTED A FUNNEL CLOUD AND POSSIBLE SMALL TORNADO. THIS POSSIBLE TORNADO WAS LOCATED NEAR CHEYENNE AND WAS MOVING SLOWLY EAST AT LESS THAN 10 MPH. THE POSSIBLE TORNADO WILL BE NEAR... I-80 MM 370 BY NOON MDT... REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN CHEYENNE AT 1-800-269-6220. LAT...LON 4121 10495 4103 10492 4104 10460 4127 10464 $$ SOWKO
000 WWUS55 KCYS 201751 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 1150 AM MDT SUN MAY 20 2007 WYC021-201800- /O.CAN.KCYS.TO.W.0004.000000T0000Z-070520T1800Z/ LARAMIE WY- 1150 AM MDT SUN MAY 20 2007 ...THE TORNADO WARNING FOR SOUTH CENTRAL LARAMIE COUNTY IS CANCELLED... LAW ENFORCEMENT AND NUMEROUS STORM SPOTTERS HAVE CONFIRMED THAT THE FUNNEL CLOUD HAS DISSIPATED...THUS THE WARNING HAS BEEN CANCELLED. LAT...LON 4121 10495 4103 10492 4104 10460 4127 10464 $$ SOWKO
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 1:36 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 54 min |
| May 20, 2:28 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 62 min |
Nearby
Tornado Warnings in Wyoming, 2007Every tornado warning in 2007Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.