Alert archive / Wyoming / Flash Flood Warnings in 2011
Flash Flood Warning 6, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Jun 19, 2011, 3:11 PM MDT for Laramie County, Wyoming. It was in force for 5 hr. 4 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
- Jun 19, 2011, 3:11 PM MDT (21:11 UTC)
- Expired
- Jun 19, 2011, 8:40 PM MDT
- In force
- 5 hr
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Flood severity
- None
County Laramie County, WY
The radar
The Cheyenne radar (KCYS), 12 km from the middle of the area, began a volume at 21:13 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 |
|---|---|---|---|
| Jun 19, 3:28 PM MDT | FLASH FLOOD | Cheyenne, WY | FLOODING WAS REPORTED AT THE AMES AVE UNDERPASS, ALSO AT THE 2200 BLOCK OF E 16TH ST, AND AT HINES AND 2ND AVE. THE MURDOCH PARKING LOT ALONG EAST LINCOLN WAY ALSO FLOODED. |
| Jun 19, 3:30 PM MDT | FLASH FLOOD | 3 E Cheyenne, WY | INTERSECTION FLOODED. |
| Jun 19, 3:38 PM MDT | HEAVY RAIN 1.48 | Cheyenne, WY | RAIN FELL IN 50 MIN. MARBLE SIZE HAIL ALSO. THIS WAS IN THE SOUTHEAST PART OF TOWN...SUN VALLEY |
| Jun 19, 3:46 PM MDT | FLASH FLOOD | 3 Nw Cheyenne, WY | BASEMENT FLOODING. |
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 12:00Z, 9.2 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
- 330 J/kg
- Mixed-layer CIN
- -236 J/kg
- Mixed-layer LCL
- 1573 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 100 m²/s²
- 0-3 km storm-relative helicity
- 108 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
694 WGUS55 KCYS 192111 FFWCYS WYC021-200300- /O.NEW.KCYS.FF.W.0006.110619T2111Z-110620T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 311 PM MDT SUN JUN 19 2011 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * FLASH FLOOD WARNING FOR... LARAMIE COUNTY IN SOUTHEAST WYOMING... * UNTIL 900 PM MDT * AT 309 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. RADAR ESTIMATED RAINFALL FROM WEATHER SERVICE RADAR IS SHOWING THAT HOURLY RAINFALL AMOUNTS UP TO AN INCH AND A HALF ARE POSSIBLE. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... CHEYENNE...ALBIN...BURNS...CARPENTER...FEDERAL...GUN BARREL... MERIDEN REST AREA...NORTH CHEYENNE...PINE BLUFFS...WARREN AF BASE AND WHITAKER. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN CHEYENNE. && LAT...LON 4101 10509 4155 10517 4156 10408 4100 10406 $$ CLAYCOMB
2 follow-up statements
093 WGUS75 KCYS 192306 FFSCYS FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 506 PM MDT SUN JUN 19 2011 WYC021-200300- /O.CON.KCYS.FF.W.0006.000000T0000Z-110620T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LARAMIE WY- 506 PM MDT SUN JUN 19 2011 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR EASTERN LARAMIE COUNTY UNTIL 900 PM MDT... AT 504 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. HOURLY ESTIMATED RAINFALL OBSERVED ON WEATHER SERVICE RADR AROUND AN INCH PER HOUR IS BEING OBSERVED ACROSS EASTERN PORTIONS OF LARAMIE COUNTY. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... ALBIN...BURNS...CARPENTER...GUN BARREL AND MERIDEN REST AREA. PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY SO THAT THEY MAY TAKE APPROPRIATE ACTION TO CLOSE FLOODED ROADWAYS. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN CHEYENNE. && LAT...LON 4101 10458 4155 10467 4156 10408 4100 10406 $$ CLAYCOMB
881 WGUS75 KCYS 200240 FFSCYS FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 840 PM MDT SUN JUN 19 2011 WYC021-200255- /O.CAN.KCYS.FF.W.0006.000000T0000Z-110620T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LARAMIE WY- 840 PM MDT SUN JUN 19 2011 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR EASTERN LARAMIE COUNTY IS CANCELLED... EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED... PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY. LAT...LON 4101 10458 4155 10467 4156 10408 4100 10406 $$ CLAYCOMB
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 3:03 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 42 min |
| Jun 19, 3:43 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 33 min |
Nearby
Flash Flood Warnings in Wyoming, 2011Every flash flood warning in 2011
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.