Alert archive / Nebraska / Flash Flood Warnings in 1991
Flash Flood Warning 2, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at May 10, 1991, 9:58 PM MDT for Dawes County, Sioux County, Nebraska. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- May 10, 1991, 9:58 PM MDT (03:58 UTC)
- Expired
- May 11, 1991, 2:00 AM MDT
- In force
- 4 hr
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
Counties Dawes County, NE, Sioux County, NE
The nearest sounding before it
Rapid City, SD (KRAP), launched 00:00Z, 4.0 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
- 2978 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 294 m²/s²
- 0-3 km storm-relative helicity
- 325 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KBFF 110358
FFWBFF
NEC165-045-110800-
BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
958 PM MDT FRI MAY 10 1991
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 200 AM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN THE PANHANDLE OF NEBRASKA
NORTHERN SIOUX...WESTERN DAWES
AT 956 PM MDT...FLASH FLOODING WAS OCCURRING FROM 35 MILES
SOUTHWEST TO 25 MILES SOUTHWEST OF CHADRON NEBRASKA. THIS AREA WAS
ALONG THE WHITE RIVER AND ITS TRIBUTARIES...AND INCLUDED DOWNSTREAM
AREAS OF FORT ROBINSON STATE PARK AND THE TOWN OF CRAWFORD.
THE WHITE RIVER WAS 1/4 MILE WIDE AT THE BRIDGE IN CRAWFORD WITH
WATER LEVEL JUST 6 FEET BELOW THE BRIDGE FLOOR.
A FLASH FLOOD WARNING MEANS THAT FLASH FLOODING IS OCCURRING OR
IMMINENT. DO NOT WASTE TIME TRYING TO SAVE PERSONAL PROPERTY...MOVE
TO HIGHER GROUND IMMEDIATELY. DO NOT ATTEMPT TO CROSS FAST MOVING
WATER BY FOOT OR AUTO.
DO NOT ATTEMPT TO DRIVE OVER A ROAD COVERED BY WATER. THE ROAD
COULD BE WASHED OUT UNDER THE WATER.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOOD WATERS. IF FLASH FLOODING IS OBSERVED...ACT
QUICKLY. MOVE TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY
IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
PFEIFFERWhat forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, May 10, 5:41 PM MDT, 4 hours 17 minutes before
WYZ012-017-110100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 440 PM MDT FRI MAY 10 1991 ...A TORNADO WATCH CONTINUES IN EFFECT FOR EXTREME EASTERN WYOMING UNTIL 9 PM THIS EVENING... THUNDERSTORMS CONTINUED OVER THE SOUTHEAST CORNER OF WYOMING LATE THIS AFTERNOON. THE STRONGEST STORMS WERE ALONG INTERSTATE 25 HEADING NORTH FROM CHEYENNE. A PILOT OBSERVED A POSSIBLE FUNNEL CLOUD ABOUT 30 TO 35 MILES NORTH OF CHEYENNE. RADAR INDICATED THESE STORMS WERE LIKELY PRODUCING SMALL HAIL AS WELL. THE THUNDERSTORMS THAT PRODUCED GOLF-BALL SIZE HAIL IN THE TORRINGTON AREA EARLIER HAD MOVED NORTHEAST INTO NEBRASKA. STRONG THUNDERSTORMS WILL CONTINUE TO BE POSSIBLE OVER SOUTHEAST WYOMING THIS EVENING. A TORNADO WATCH FOR THE EXTREME EAST WILL CONTINUE UNTIL 9 PM TONIGHT. PEOPLE IN SOUTHEAST WYOMING SHOULD BE ALERT FOR THUNDERSTORM ACTIVITY THIS EVENING AND TAKE SHELTER IF THUNDERSTORMS APPROACH. LISTEN TO NOAA WEATHER RADIO OR THE LOCAL MEDIA FOR ADDITIONAL INFORMATION ON THE STORMS. SCOTT
Special weather statement, May 10, 5:42 PM MDT, 4 hours 16 minutes before
WYZ012-017-110100- SPECIAL WEATHER STATEMENT...CORRECTED FOR TIME NATIONAL WEATHER SERVICE CHEYENNE WY 540 PM MDT FRI MAY 10 1991 ...A TORNADO WATCH CONTINUES IN EFFECT FOR EXTREME EASTERN WYOMING UNTIL 9 PM THIS EVENING... THUNDERSTORMS CONTINUED OVER THE SOUTHEAST CORNER OF WYOMING LATE THIS AFTERNOON. THE STRONGEST STORMS WERE ALONG INTERSTATE 25 HEADING NORTH FROM CHEYENNE. A PILOT OBSERVED A POSSIBLE FUNNEL CLOUD ABOUT 30 TO 35 MILES NORTH OF CHEYENNE. RADAR INDICATED THESE STORMS WERE LIKELY PRODUCING SMALL HAIL AS WELL. THE THUNDERSTORMS THAT PRODUCED GOLF-BALL SIZE HAIL IN THE TORRINGTON AREA EARLIER HAD MOVED NORTHEAST INTO NEBRASKA. STRONG THUNDERSTORMS WILL CONTINUE TO BE POSSIBLE OVER SOUTHEAST WYOMING THIS EVENING. A TORNADO WATCH FOR THE EXTREME EAST WILL CONTINUE UNTIL 9 PM TONIGHT. PEOPLE IN SOUTHEAST WYOMING SHOULD BE ALERT FOR THUNDERSTORM ACTIVITY THIS EVENING AND TAKE SHELTER IF THUNDERSTORMS APPROACH. LISTEN TO NOAA WEATHER RADIO OR THE LOCAL MEDIA FOR ADDITIONAL INFORMATION ON THE STORMS. SCOTT
Special weather statement, May 10, 8:22 PM MDT, 1 hour 36 minutes before
WYZ012-017-110300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 820 PM MDT FRI MAY 10 1991 ...A TORNADO WATCH CONTINUES IN EFFECT FOR EXTREME EASTERN WYOMING UNTIL 9 PM THIS FRIDAY EVENING... AT 815 PM...WEATHER RADAR AT CHEYENNE SHOWED SOME LINGERING SHOWERS AND THUNDERSTORMS ACROSS THE FAR NORTHERN PART OF PLATTE AND GOSHEN COUNTIES. STRONGEST STORMS WERE LOCATED IN THE NORTHEAST PART OF GOSHEN COUNTY...ABOUT 35 MILES NORTH OF TORRINGTON. A FEW OTHER WEAK STORMS WERE LOCATED JUST WEST OF TORRINGTON ALSO. ALL STORMS WERE MOVING NORTH AT 35 MILES AN HOUR. ONCE THESE STORMS EXIT THE WATCH AREA...THERE SHOULD BE NO OTHER SIGNIFICANT THUNDERSTORMS IN SOUTHEAST WY}OMING. HENCE...IT APPEARS VERY LIKELY THAT THE TORNADO WATCH WILL BE ALLOWED TO EXPIRE AT 9 PM. JAD
Special weather statement, May 10, 9:00 PM MDT, 58 minutes before
WYZ012-017-110330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 900 PM MDT FRI MAY 10 1991 ...THE TORNADO WATCH FOR EXTREME EASTERN WYOMING IS NO LONGER IN EFFECT AS OF 9 PM... JUST A FEW THUNDERSTORMS LINGERED ACROSS CENTRAL GOSHEN COUNTY OF SOUTHEAST WYOMING AT 855 PM. THESE STORMS ARE NOT EXPECTED TO BECOME SEVERE...AND SO THE TORNADO WATCH HAS BEEN ALLOWED TO EXPIRE AS OF 9 PM. JAD
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 6:03 PM MDT | Flash Flood Warning | CYS | Dawes, Sioux | 4 hr |
| May 10, 6:33 PM MDT | Severe Thunderstorm Warning | CYS | Dawes, Sioux | 57 min |
| May 10, 7:34 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 56 min |
| May 10, 8:33 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 57 min |
| May 10, 9:35 PM MDT | Severe Thunderstorm Warning | CYS | Dawes, Sioux | 55 min |
| May 11, 3:46 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 59 min |
| May 11, 4:48 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 27 min |
| May 11, 5:41 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 34 min |
| May 11, 5:56 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Morrill | 64 min |
Nearby
Flash Flood Warnings in Nebraska, 1991Every flash flood warning in 1991
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.