Alert archive / Wyoming / Flash Flood Warnings in 2011
Flash Flood Warning 13, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Jul 12, 2011, 7:09 PM MDT for Goshen County, Laramie County, Wyoming. It was in force for 8 hr. 3 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
- Jul 12, 2011, 7:09 PM MDT (01:09 UTC)
- Expired
- Jul 13, 2011, 3:05 AM MDT
- In force
- 8 hr
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Flood severity
- None
Counties Goshen County, WY, Laramie County, WY
The radar
The Cheyenne radar (KCYS), 41 km from the middle of the area, began a volume at 01:09 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 |
|---|---|---|---|
| Jul 12, 7:16 PM MDT | FLASH FLOOD | 3 Sw Burns, WY | FLOODING OVER ACCESS ROAD BETWEEN MILE MARKER 380 AND 381 ON INTERSTATE 80. FLOODING OF ROAD 142 NEAR MILE MARKER 380 AND 381 FLOODED AS WELL |
| Jul 12, 8:25 PM MDT | FLASH FLOOD | 20 W Pine Bluffs, WY | AT MILE MARKER 380 ON INTERSTATE 80...APPROXIMATELY 2 INCHES OF WATER IS COVERING THE ROAD. WATER IS RECEDING AT TIME OF REPORT. |
| Jul 12, 9:39 PM MDT | FLASH FLOOD | 10 S Burns, WY | 4 INCHES OF WATER OVER ROADWAY FLOWING FROM FLOODING IN NEARBY FARM FIELDS. |
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, 1.2 hours before the alert went out and 181 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
- 596 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 1449 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 256 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.2
The text
As transmitted, in the capitals the NWS used until 2016.
333 WGUS55 KCYS 130109 FFWCYS WYC015-021-130400- /O.NEW.KCYS.FF.W.0013.110713T0109Z-110713T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 709 PM MDT TUE JUL 12 2011 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * FLASH FLOOD WARNING FOR... EASTERN LARAMIE COUNTY IN SOUTHEAST WYOMING... SOUTH CENTRAL GOSHEN COUNTY IN SOUTHEAST WYOMING... * UNTIL 1000 PM MDT * AT 708 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. RADAR ESTIMATED RAINFALL OF 2 TO 3 INCHES HAS FALLEN IN THE WARNED AREA. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... ALBIN...BURNS...CARPENTER...GUN BARREL...MERIDEN REST AREA AND PINE BLUFFS. PRECAUTIONARY/PREPAREDNESS ACTIONS... ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE WARNED AREA. TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN CHEYENNE. && LAT...LON 4102 10451 4170 10456 4155 10405 4102 10405 $$ CLAYCOMB
2 follow-up statements
734 WGUS55 KCYS 130354 FFWCYS WYC015-021-131000- /O.EXT.KCYS.FF.W.0013.000000T0000Z-110713T1000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 954 PM MDT TUE JUL 12 2011 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS EXTENDED THE * FLASH FLOOD WARNING FOR... EASTERN LARAMIE COUNTY IN SOUTHEAST WYOMING... SOUTH CENTRAL GOSHEN COUNTY IN SOUTHEAST WYOMING... * UNTIL 400 AM MDT WEDNESDAY * AT 948 PM MDT...SPOTTERS AND DEPARTMENT OF TRANSPORTATION PERSONNEL REPORTED SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA...CREATING CONTINUED FLOODING CONDITIONS. RADAR ESTIMATED RAINFALL OF 3.0 TO 3.5 INCHES HAS FALLEN IN THE WARNED AREAS. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... ALBIN...BURNS...CARPENTER...GUN BARREL...MERIDEN REST AREA AND PINE BLUFFS. PRECAUTIONARY/PREPAREDNESS ACTIONS... ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE WARNED AREA. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN CHEYENNE. && LAT...LON 4102 10451 4170 10456 4155 10405 4102 10405 $$ CLAYCOMB
730 WGUS75 KCYS 130905 FFSCYS FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 305 AM MDT WED JUL 13 2011 WYC015-021-130920- /O.CAN.KCYS.FF.W.0013.000000T0000Z-110713T1000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ GOSHEN WY-LARAMIE WY- 305 AM MDT WED JUL 13 2011 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR EASTERN LARAMIE AND SOUTH CENTRAL GOSHEN COUNTIES IS CANCELLED... EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS AND CREEKS IN THE WARNED AREA WERE BEGINNING TO RECEDE...BUT WILL LIKELY REMAIN BANKFULL THROUGH EARLY THIS MORNING. IF FLOODING HAS BEEN OBSERVED...PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY. LAT...LON 4102 10451 4170 10456 4155 10405 4102 10405 $$ TJT
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 6:03 PM MDT | Tornado Warning | CYS | Goshen, Laramie, Platte | 30 min |
| Jul 12, 6:03 PM MDT | Tornado Warning | CYS | Laramie | 27 min |
| Jul 12, 6:56 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 45 min |
| Jul 12, 7:46 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 32 min |
| Jul 12, 10:26 PM MDT | Flash Flood Warning | CYS | Goshen, Laramie, Platte | 4 hr |
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.