Alert archive / Wyoming / Flash Flood Warnings in 2007
Flash Flood Warning 21, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Aug 22, 2007, 10:04 PM MDT for Laramie County, Wyoming. It was in force for 116 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 22, 2007, 10:04 PM MDT (04:04 UTC)
- Expired
- Aug 23, 2007, 12:00 AM MDT
- In force
- 116 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Laramie County, WY
The radar
The Cheyenne radar (KCYS), 20 km from the middle of the area, began a volume at 04:06 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 |
|---|---|---|---|
| Aug 22, 10:45 PM MDT | FLASH FLOOD | Cheyenne, WY | WATER REPORTED OVER ROADWAY...ONTO SIDEWALKS AND LAWNS ON 17TH STREET AT LOGAN AVE...ON THE NORTH SIDE OF ALTA VISTA SCHOOL. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Denver, CO (KDEN), launched 00:00Z, 4.1 hours before the alert went out and 202 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
- 95 J/kg
- Mixed-layer CIN
- -128 J/kg
- Mixed-layer LCL
- 2736 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS55 KCYS 230406 FFWCYS WYC021-230600- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 1004 PM MDT WED AUG 22 2007 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTH CENTRAL LARAMIE COUNTY IN SOUTHEAST WYOMING... * UNTIL MIDNIGHT MDT * AT 1001 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SOUTH GREELEY HIGHWAY AND FOX FARM-COLLEGE ADDITIONAL RAINFALL AMOUNTS OF ONE INCH PER HOUR ARE POSSIBLE IN THE WARNED AREA. TOTAL RAINFALL AMOUNTS OF TWO TO THREE INCHES ARE POSSIBLE IN THE FLASH FLOOD WARNING AREA. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. REPORT FLOODING TO THE NATIONAL WEATHER SERVICE OFFICE IN CHEYENNE AT 1-800-269-6220. LAT...LON 4100 10496 4100 10461 4114 10461 4112 10495 $$ RUBIN
2 follow-up statements
000 WGUS75 KCYS 230449 FFSCYS FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 1046 PM MDT WED AUG 22 2007 WYC021-230600- LARAMIE WY- 1046 PM MDT WED AUG 22 2007 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT FOR SOUTH CENTRAL LARAMIE COUNTY... AT 1044 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A THUNDERSTORM PRODUCING MODERATE TO HEAVY RAIN OVER THE WARNED AREA. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SOUTH GREELEY HIGHWAY AND FOX FARM-COLLEGE ROAD OF SOUTH CHEYENNE. THE FLASH FLOOD WARNING AREA EXTENDS FROM SOUTH CHEYENNE TO THE COLORADO STATE LINE. ADDITIONAL RAINFALL AMOUNTS OF UP TO ONE INCH ARE POSSIBLE IN THE WARNED AREA. NATIONAL WEATHER SERVICE DOPPLER INDICATED THAT 3 TO 4 INCHES OF RAIN HAD FALLEN IN AN AREA FROM 5 MILES SOUTHWEST OF CHEYENNE TO 5 MILES SOUTHEAST OF CHEYENNE. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO HIGHER GROUND. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. LAT...LON 4100 10496 4100 10461 4114 10461 4112 10495 $$ RUBIN
000 WGUS75 KCYS 230531 FFSCYS FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 1130 PM MDT WED AUG 22 2007 WYC021-230540- LARAMIE WY- 1130 PM MDT WED AUG 22 2007 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTH CENTRAL LARAMIE COUNTY... THUNDERSTORMS PRODUCING HEAVY RAIN HAVE MOVED SOUTH OF LARAMIE COUNTY...THEREFORE THE FLASH FLOOD WARNING HAS BEEN CANCELLED. LAT...LON 4100 10496 4100 10461 4114 10461 4112 10495 $$ RUBIN
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 6:56 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 64 min |
| Aug 22, 7:58 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 33 min |
| Aug 22, 8:49 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 56 min |
| Aug 22, 9:42 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 63 min |
| Aug 22, 9:57 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 63 min |
Nearby
Flash Flood Warnings in Wyoming, 2007Every flash flood 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.