Alert archive / Nebraska / Flash Flood Warnings in 2011
Flash Flood Warning 25, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Aug 29, 2011, 4:12 PM MDT for Banner County, Cheyenne County, Kimball County, Nebraska. It was in force for 3 hr. 2 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
- Aug 29, 2011, 4:12 PM MDT (22:12 UTC)
- Expired
- Aug 29, 2011, 7:00 PM MDT
- In force
- 3 hr
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Flood severity
- None
Counties Banner County, NE, Cheyenne County, NE, Kimball County, NE
The radar
The Cheyenne radar (KCYS), 135 km from the middle of the area, began a volume at 22:13 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 |
|---|---|---|---|
| Aug 29, 5:00 PM MDT | HEAVY RAIN 2.5 | 2 Se Dalton, NE | STILL RAINING HARD |
| Aug 29, 5:50 PM MDT | FLASH FLOOD | 7 Se Sidney, NE | CHEYENNE COUNTY DISPATCH REPORTS MOST COUNTY ROADS SOUTHEAST OF SIDNEY TO THE DEUEL COUNTY LINE REMAIN FLOODED. TRAVEL IN SOUTHEASTERN CHEYENNE COUNTY CONTINUES TO BE DISCOURAGED EARLY THIS EVENING. |
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, 10.2 hours before the alert went out and 141 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
- 157 J/kg
- Mixed-layer CIN
- -137 J/kg
- Mixed-layer LCL
- 1100 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 76 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
672
WGUS55 KCYS 292212
FFWCYS
NEC007-033-105-300100-
/O.NEW.KCYS.FF.W.0025.110829T2212Z-110830T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
412 PM MDT MON AUG 29 2011
THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CHEYENNE COUNTY IN THE PANHANDLE OF NEBRASKA...
EXTREME SOUTHEASTERN BANNER COUNTY IN THE PANHANDLE OF NEBRASKA...
KIMBALL COUNTY IN THE PANHANDLE OF NEBRASKA...
* UNTIL 700 PM MDT
* AT 408 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
WARNED AREA. RADAR ESTIMATED RAINFALL UP TO 3 INCHES HAS FALLEN
OVER SOUTHEASTERN CHEYENNE COUNTY. A LINE OF THUNDERSTORMS WITH
THUNDERSTORMS CAPABLE OF PRODUCING TORRENTIAL RAINFALL IS MOVING
INTO KIMBALL COUNTY AND WILL FURTHER IMPACT MOST OF CHEYENNE
COUNTY THROUGH 7 PM.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
KIMBALL...SIDNEY...BENNETT RESERVOIR...BROWNSON...COLTON...
DALTON...DIX...GURLEY...LODGEPOLE...LORENZO...OLIVER RESERVOIR...
PANORAMA POINT...POTTER...SIDNEY AIRPORT AND SUNOL.
AT 358 PM...CHEYENNE COUNTY DISPATCH REPORTS MOST COUNTY ROADS
SOUTHEAST OF SIDNEY FLOODED AND CLOSED. TRAVEL IS NOT RECOMMENDED
ACROSS SOUTHEAST CHEYENNE COUNTY THIS AFTERNOON.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
CHEYENNE.
&&
LAT...LON 4099 10263 4100 10406 4106 10405 4141 10374
4143 10262 4110 10259
$$
CLAYCOMB2 follow-up statements
013 WGUS75 KCYS 292355 FFSCYS FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 555 PM MDT MON AUG 29 2011 NEC007-105-300006- /O.CAN.KCYS.FF.W.0025.000000T0000Z-110830T0100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BANNER NE-KIMBALL NE- 555 PM MDT MON AUG 29 2011 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR KIMBALL AND EXTREME SOUTHEASTERN BANNER COUNTIES IS CANCELLED... EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED... PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY. LAT...LON 4099 10263 4100 10292 4122 10260 4110 10259 $$ NEC033-300100- /O.CON.KCYS.FF.W.0025.000000T0000Z-110830T0100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CHEYENNE NE- 555 PM MDT MON AUG 29 2011 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHEASTERN CHEYENNE COUNTY UNTIL 700 PM MDT... AT 551 PM MDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. RADAR ESTIMATED STORM TOTAL RAINFALL OF THREE TO THREE AND A HALF INCHES HAS FALLEN OVER PORTIONS OF SOUTHEASTERN CHEYENNE COUNTY THIS AFTERNOON. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... LODGEPOLE. CHEYENNE COUNTY LAW ENFORCEMENT CONTINUES TO REPORT MOST COUNTY ROADS FLOODED SOUTHEAST OF SIDNEY. TRAVEL ACROSS SOUTHEASTERN CHEYENNE COUNTY SOUTHEAST OF SIDNEY CONTINUES TO BE DISCOURAGED. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...LODGEPOLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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 4099 10263 4100 10292 4122 10260 4110 10259 $$ CLAYCOMB
702 WGUS75 KCYS 300050 FFSCYS FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 650 PM MDT MON AUG 29 2011 NEC033-300106- /O.EXP.KCYS.FF.W.0025.000000T0000Z-110830T0100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CHEYENNE NE- 650 PM MDT MON AUG 29 2011 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHEASTERN CHEYENNE COUNTY WILL BE ALLOWED TO EXPIRE AT 700 PM MDT... EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED... PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY. LAT...LON 4099 10263 4100 10292 4122 10260 4110 10259 $$ CLAYCOMB
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 6:49 PM MDT | Special Weather Statement | CYS | Kimball | 56 min |
| Aug 28, 8:20 PM MDT | Special Weather Statement | CYS | Banner | 55 min |
| Aug 29, 1:34 PM MDT | Flash Flood Warning | CYS | Cheyenne | 3 hr |
| Aug 29, 1:43 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 49 min |
| Aug 29, 2:42 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 63 min |
| Aug 29, 3:20 PM MDT | Special Weather Statement | CYS | Cheyenne | 55 min |
| Aug 29, 3:25 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Kimball, Scotts Bluff | 65 min |
| Aug 29, 3:41 PM MDT | Severe Thunderstorm Warning | CYS | Dawes, Sioux | 64 min |
| Aug 29, 4:21 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Cheyenne, Kimball, Morrill, Scotts Bluff | 54 min |
| Aug 29, 4:49 PM MDT | Special Weather Statement | CYS | Dawes | 56 min |
| Aug 29, 4:53 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Dawes | 25 min |
| Aug 29, 5:13 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 29 min |
| Aug 29, 5:17 PM MDT | Tornado Warning | CYS | Dawes | 15 min |
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.