Alert archive / Nebraska / Flash Flood Warnings in 2011
Flash Flood Warning 18, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Jul 14, 2011, 8:44 PM MDT for Cheyenne County, Morrill County, Nebraska. It was in force for 4 hr. 1 report 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 14, 2011, 8:44 PM MDT (02:44 UTC)
- Expired
- Jul 15, 2011, 1:12 AM MDT
- In force
- 4 hr
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Flood severity
- None
Counties Cheyenne County, NE, Morrill County, NE
The radar
The Cheyenne radar (KCYS), 164 km from the middle of the area, began a volume at 02:45 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 14, 9:14 PM MDT | HEAVY RAIN 3 | Dalton, NE |
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, 2.7 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
- 12 J/kg
- Mixed-layer CIN
- -140 J/kg
- Mixed-layer LCL
- 1824 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 74 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
207 WGUS55 KCYS 150244 FFWCYS NEC033-123-150830- /O.NEW.KCYS.FF.W.0018.110715T0244Z-110715T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 844 PM MDT THU JUL 14 2011 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTH CENTRAL CHEYENNE COUNTY IN THE PANHANDLE OF NEBRASKA... SOUTH CENTRAL MORRILL COUNTY IN THE PANHANDLE OF NEBRASKA... * UNTIL 230 AM MDT * AT 842 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. DOPPLER RADAR ESTIMATES INDICATED ABOUT 2 INCHES OF RAIN HAD OCCURRED DURING THE LAST COUPLE OF HOURS. ADDITIONAL AMOUNTS UP TO 1 INCH CAN BE EXPECTED DURING THE NEXT HOUR OR SO. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... DALTON AND MUD SPRINGS. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. 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 4157 10275 4134 10275 4134 10311 4156 10311 $$ COX
2 follow-up statements
185 WGUS75 KCYS 150354 FFSCYS FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 954 PM MDT THU JUL 14 2011 NEC033-123-150830- /O.CON.KCYS.FF.W.0018.000000T0000Z-110715T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CHEYENNE NE-MORRILL NE- 954 PM MDT THU JUL 14 2011 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL MORRILL AND NORTH CENTRAL CHEYENNE COUNTIES UNTIL 230 AM MDT... AT 950 PM MDT...CHEYENNE COUNTY DISPATCH REPORTED THAT A SPOTTER IN DALTON REPORTED 3 INCHES OF RAINFALL DURING THE PAST 3 HOURS. THE RAINFALL WAS CONTINUING TO DIMINISH ACROSS THIS REGION AND MAY PRODUCE ANOTHER ONE HALF INCH OF RAIN. HOWEVER...THE POTENTIAL FOR FLOODING WILL CONTINUE ACROSS THIS AREA. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...DALTON AND MUD SPRINGS. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES... AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. && LAT...LON 4157 10275 4134 10275 4134 10311 4156 10311 $$ COX
131 WGUS75 KCYS 150712 FFSCYS FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 112 AM MDT FRI JUL 15 2011 NEC033-123-150727- /O.CAN.KCYS.FF.W.0018.000000T0000Z-110715T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CHEYENNE NE-MORRILL NE- 112 AM MDT FRI JUL 15 2011 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTH CENTRAL MORRILL AND NORTH CENTRAL CHEYENNE COUNTIES 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 OR THE NATIONAL WEATHER SERVICE OFFICE IN CHEYENNE. && LAT...LON 4157 10275 4134 10275 4134 10311 4156 10311 $$ HAHN
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 6:10 PM MDT | Areal Flood Advisory | CYS | Banner, Morrill, Scotts Bluff | 6 hr |
| Jul 14, 6:28 PM MDT | Areal Flood Advisory | CYS | Banner, Kimball | 4 hr |
| Jul 14, 7:30 PM MDT | Areal Flood Advisory | CYS | Cheyenne, Morrill | 3 hr |
Nearby
Flash Flood Warnings in Nebraska, 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.