Alert archive / Wyoming / Flash Flood Warnings in 2013
Flash Flood Warning 13, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Sep 12, 2013, 9:58 PM MDT for Albany County, Laramie County, Wyoming. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 12, 2013, 9:58 PM MDT (03:58 UTC)
- Expired
- Sep 13, 2013, 4:00 AM MDT
- In force
- 6 hr
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Flood severity
- None
Counties Albany County, WY, Laramie County, WY
The radar
The Cheyenne radar (KCYS), 62 km from the middle of the area, began a volume at 04:02 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 (KDEN), launched 00:00Z, 4.0 hours before the alert went out and 240 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
- 175 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 680 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -116 m²/s²
- 0-3 km storm-relative helicity
- -58 m²/s²
- Significant tornado parameter
- -0.1
- Supercell composite
- -1.1
The text
As transmitted, in the capitals the NWS used until 2016.
023 WGUS55 KCYS 130358 FFWCYS WYC001-021-131000- /O.NEW.KCYS.FF.W.0013.130913T0358Z-130913T1000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 958 PM MDT THU SEP 12 2013 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTHEASTERN ALBANY COUNTY IN SOUTHEAST WYOMING... SOUTHWESTERN LARAMIE COUNTY IN SOUTHEAST WYOMING... * UNTIL 400 AM MDT FRIDAY * AT 957 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN AREA OF VERY HEAVY RAINFALL ACROSS THE WARNED AREA. RADAR ESTIMATED RAIN FALL OF 2 TO 3 INCHES HAS FALLEN OVER THE WARNED AREA. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... BUFORD...CRYSTAL LAKE CAMPGROUND...CRYSTAL LAKE RESERVOIR...GRANITE SPRINGS CAMPGROUND...GRANITE SPRINGS RESERVOIR...HUTTON LAKE... PUMPKIN VINE...TIE SIDING...VEDAUWOO AND VEDAUWOO CAMPGROUND. PRECAUTIONARY/PREPAREDNESS ACTIONS... ADDITIONAL RAINFALL AMOUNTS OF ONE TO ONE AND A HALF INCHES ARE POSSIBLE IN THE WARNED AREA. 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. && LAT...LON 4120 10573 4121 10521 4100 10518 4099 10587 $$ CLAYCOMB
1 follow-up statement
287 WGUS75 KCYS 130720 FFSCYS FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 120 AM MDT FRI SEP 13 2013 WYC001-021-130733- /O.CAN.KCYS.FF.W.0013.000000T0000Z-130913T1000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ALBANY WY-LARAMIE WY- 120 AM MDT FRI SEP 13 2013 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHWESTERN LARAMIE AND SOUTHEASTERN ALBANY COUNTIES IS CANCELLED... THE ALBANY COUNTY SHERIFFS OFFICE HAD NO REPORTS OF FLOODING FROM THE FLASH FLOOD WARNING AREA. DOPPLER RADAR REFLECTIVITY INDICATES THAT ONLY SCATTERED AREAS OF LIGHT RAIN WILL CONTINUE FOR THE NEXT SEVERAL HOURS...THUS THE THREAT OF FLASH FLOODING HAS DIMINISHED. EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED... PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY. LAT...LON 4120 10573 4121 10521 4100 10518 4099 10587 $$ RUBIN
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 2:43 PM MDT | Areal Flood Advisory | CYS | Platte | 4 hr |
| Sep 13, 5:22 PM MDT | Areal Flood Advisory | CYS | Albany, Laramie | 6 hr |
Nearby
Flash Flood Warnings in Wyoming, 2013Every flash flood warning in 2013
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.