Alert archive / Nebraska / Flash Flood Warnings in 2011
Flash Flood Warning 23, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Aug 4, 2011, 7:55 PM MDT for Cheyenne County, Nebraska. It was in force for 4 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
- Aug 4, 2011, 7:55 PM MDT (01:55 UTC)
- Expired
- Aug 5, 2011, 12:19 AM MDT
- In force
- 4 hr
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Flood severity
- None
County Cheyenne County, NE
The radar
The Cheyenne radar (KCYS), 175 km from the middle of the area, began a volume at 01:57 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 (KDNR), launched 00:00Z, 1.9 hours before the alert went out and 169 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2478 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- -97 m²/s²
- 0-3 km storm-relative helicity
- -114 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
637
WGUS55 KCYS 050155
FFWCYS
NEC033-050800-
/O.NEW.KCYS.FF.W.0023.110805T0155Z-110805T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
755 PM MDT THU AUG 4 2011
THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHEASTERN CHEYENNE COUNTY IN THE PANHANDLE OF NEBRASKA...
* UNTIL 200 AM MDT FRIDAY
* AT 752 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL MOVING ACROSS THE
WARNED AREA. DOPPLER RADAR ESTIMATED NEARLY 2 INCHES OF RAIN HAD
OCCURRED DURING THE LAST HOUR. THE BACK EDGE OF THE THUNDERSTORMS
WERE BEGINNING TO MOVE INTO EASTERN KIMBALL COUNTY...SO THE HEAVY
RAINFALL MAY CONTINUE ACROSS THIS AREA DURING THE NEXT COUPLE OF
HOURS BEFORE ENDING. UNTIL THEN...ANOTHER ONE TO TWO INCHES OF
RAINFALL WILL BE POSSIBLE.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
GURLEY.
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.
&&
LAT...LON 4123 10261 4122 10298 4144 10297 4143 10264
4140 10264 4140 10260
$$
COX2 follow-up statements
644
WGUS75 KCYS 050444
FFSCYS
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1044 PM MDT THU AUG 4 2011
NEC033-050800-
/O.CON.KCYS.FF.W.0023.000000T0000Z-110805T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHEYENNE NE-
1044 PM MDT THU AUG 4 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHEASTERN CHEYENNE
COUNTY UNTIL 200 AM MDT...
AT 1043 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
FEW LIGHT RAIN SHOWERS ACROSS EASTERN CHEYENNE COUNTY PRODUCING
RAINFALL AMOUNTS UNDER ONE TENTH OF AN INCH.
AT 1030 PM MDT...THE CHEYENNE COUNTY SHERIFFS OFFICE HAD NO REPORTS
OF FLOODING FROM THE FLASH FLOOD WARNING AREA.
DOPPLER RADAR ESTIMATES THAT 2 TO 3 INCHES OF RAIN FELL FROM EARLIER
THUNDERSTORMS IN A SMALL AREA 13 MILES NORTHEAST OF SIDNEY...OR 9
MILES NORTH OF SUNOL.
THE FLASH FLOOD WARNING MAY BE CANCELLED EARLY IF THERE ARE NO
FLOODING REPORTS...ESPECIALLY SINCE HEAVIER RAINFALL HAS ENDED
ACROSS THE FLASH FLOOD WARNING AREA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY SO THAT THEY
MAY TAKE APPROPRIATE ACTION TO CLOSE FLOODED ROADWAYS. THEY WILL
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN CHEYENNE.
&&
LAT...LON 4123 10261 4122 10298 4144 10297 4143 10264
4140 10264 4140 10260
$$
RUBIN896
WGUS75 KCYS 050619
FFSCYS
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1219 AM MDT FRI AUG 5 2011
NEC033-050634-
/O.CAN.KCYS.FF.W.0023.000000T0000Z-110805T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHEYENNE NE-
1219 AM MDT FRI AUG 5 2011
...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHEASTERN
CHEYENNE 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 4123 10261 4122 10298 4144 10297 4143 10264
4140 10264 4140 10260
$$
HAHNThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 6:02 PM MDT | Severe Thunderstorm Warning | CYS | Morrill | 58 min |
| Aug 4, 6:38 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Morrill | 28 min |
| Aug 4, 6:58 PM MDT | Severe Thunderstorm Warning | CYS | Morrill | 43 min |
| Aug 4, 7:13 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 15 min |
| Aug 4, 7:33 PM MDT | Areal Flood Advisory | CYS | Cheyenne | 26 min |
| Aug 5, 3:48 PM MDT | Special Weather Statement | CYS | Kimball | 57 min |
| Aug 5, 4:04 PM MDT | Special Weather Statement | CYS | Kimball | 56 min |
| Aug 5, 4:42 PM MDT | Special Weather Statement | CYS | Kimball | 63 min |
| Aug 5, 4:51 PM MDT | Special Weather Statement | CYS | Box Butte | 39 min |
| Aug 5, 5:17 PM MDT | Special Weather Statement | CYS | Dawes | 43 min |
| Aug 5, 5:39 PM MDT | Special Weather Statement | CYS | Box Butte | 51 min |
| Aug 5, 5:53 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte | 42 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.