Alert archive / Wyoming / Flash Flood Warnings in 1991
Flash Flood Warning 3, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at May 15, 1991, 4:12 PM MDT for Albany County, Laramie County, Wyoming. It was in force for 2 hr.
The area
The counties it named.
The facts
- Issued
- May 15, 1991, 4:12 PM MDT (22:12 UTC)
- Expired
- May 15, 1991, 6:27 PM MDT
- In force
- 2 hr
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
Counties Albany County, WY, Laramie County, WY
The nearest sounding before it
Denver, CO (KDEN), launched 12:00Z, 10.2 hours before the alert went out and 245 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
- 2644 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- -72 m²/s²
- 0-3 km storm-relative helicity
- -40 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 KCYS 152212
FFWCYS
WYC001-021-160115-
BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
412 PM MDT WED MAY 15 1991
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 715 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN THE SOUTHEAST PART OF WYOMING
EXTREME SOUTHEAST AND EAST CENTRAL ALBANY COUNTY...
LARAMIE COUNTY
THIS WARNING INCLUDES THE FOLLOWING CITIES OR TOWNS... CHEYENNE...
HILLSDALE...BURNS...PINE BLUFFS...AND ALBIN.
AT 410 PM THUNDERSTORMS CONTINUED TO PRODUCE HEAVY RAIN ACROSS
LARAMIE AND EAST ALBANY COUNTY. MINOR STREET AND CREEK FLOODING
HAS ALREADY BEEN REPORTED. THE STORMS WILL CONTINUE OVER SOUTHEAST
WYOMING UNTIL 7 PM...AND LOCALIZED FLOODING WILL OCCUR.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY.
THE WATER DEPTH MAY BE TOO GREAT TO ALLOW SAFE CROSSING. VEHICLES
CAUGHT IN RISING WATERS SHOULD BE ABANDONED QUICKLY. MOVE TO
HIGHER GROUND.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS THE
ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...
ON FOOT. MOVE TO HIGHER GROUND.
MENTZERWhat 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 15, 1:27 PM MDT, 2 hours 45 minutes before
WYZ012-017-152100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 125 PM MDT WED MAY 15 1991 ...A TORNADO WATCH IS IN EFFECT FOR EXTREME SOUTHEAST WYOMING UNTIL 7PM THIS EVENING... THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WATCH FOR EXTREME SOUTHEAST WYOMING...VALID UNTIL 7PM THIS EVENING. THIS WATCH INCLUDES THE CITIES OF CHEYENNE...PINE BLUFFS...AND LAGRANGE. SHOWERS AND THUNDERSTORMS HAVE DEVELOPED IN SOUTHEAST WYOMING THIS AFTERNOON. HAIL WAS REPORTED JUST AFTER NOON NEAR LARAMIE. THESE SHOWERS AND THUNDERSTORMS WILL CONTINUE THROUGHOUT THE REMAINDER OF THIS AFTERNOON AND INTO THIS EVENING. THEY COULD PRODUCE STRONG DAMAGING WINDS...HAIL...AND HEAVY RAINS. ALSO...A FLASH FLOOD WATCH HAS BEEN ISSUED FOR SOUTHEAST WYOMING UNTIL 10PM THIS EVENING. PEOPLE IN SOUTHEAST WYOMING ARE URGED TO KEEP ABREAST OF THE LATEST WEATHER DEVELOPEMENTS. IF THREATENING WEATHER APPROACHES...GO TO A SAFE PLACE. CGB
Special weather statement, May 15, 2:07 PM MDT, 2 hours 5 minutes before
NEZ-001-005-011-152110- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE VALENTINE NE ISSUED BY SCOTTSBLUFF NE 205 PM MDT WED MAY 15 1991 ...THUNDERSTORMS MOVING ACROSS WESTERN AND CENTRAL CHERRY COUNTY... AT 203 PM MDT...RADAR INDICATED AN AREA OF THUNDERSTORMS MOVING ACROSS WESTERN AND CENTRAL CHERRY COUNTY IN NORTHCENTRAL NEBRASKA. THE STRONGEST STORM WAS 70 MILES WEST OF VALENTINE OR 20 MILES SOUTH OF MERRIMAN NEBRASKA MOVING TO THE NORTH AT 20 MPH. BRIEF HEAVY RAIN... SMALL HAIL AND VERY STRONG GUSTY WINDS WILL BE POSSIBLE WITH THESE STORMS UNTIL 300 PM MDT AS THEY MOVE NORTH ACROSS CHERRY COUNTY IN NORTHCENTRAL NEBRASKA. SALMONS
Special weather statement, May 15, 2:29 PM MDT, 1 hour 43 minutes before
NEZ-001-005-011-152130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SCOTTSBLUFF NE 229 PM MDT TUE MAY 14 1991 ...A STRONG THUNDERSTORM IN THE NORTHERN NEBRASKA PANHANDLE... ...TORNADO WATCH NUMBER 338 IN EFFECT UNTIL 7 PM MDT FOR THE NEBRASKA PANHANDLE... AT 226 PM MDT...RADAR INDICATED A STRONG THUNDERSTORM IN EXTREME SOUTHEAST DAWES COUNTY ABOUT 20 MILES SOUTHEAST OF CHADRON...OR 30 MILES NORTH OF ALLIANCE. THE STORM WAS MOVING NORTH AT 20 MPH AND SHOULD REMAIN EAST OF CHADRON AS IT MOVES THROUGH FAR WESTERN DAWES COUNTY. BRIEF HEAVY RAIN...SMALL HAIL AND STRONG GUSTY WIND ARE POSSIBLE WITH THIS STORM AS IT MOVES THROUGH THE NORTHERN PANHANDLE UNTIL 330 PM MDT. PEEK
Special weather statement, May 15, 2:32 PM MDT, 1 hour 40 minutes before
NEZ-001-005-011-152130- SPECIAL WEATHER STATEMENT...CORRECTED NATIONAL WEATHER SERVICE SCOTTSBLUFF NE 229 PM MDT TUE MAY 14 1991 ...A STRONG THUNDERSTORM IN THE NORTHERN NEBRASKA PANHANDLE... ...TORNADO WATCH NUMBER 338 IN EFFECT UNTIL 7 PM MDT FOR THE NEBRASKA PANHANDLE... AT 226 PM MDT...RADAR INDICATED A STRONG THUNDERSTORM IN EXTREME SOUTHEAST DAWES COUNTY ABOUT 20 MILES SOUTHEAST OF CHADRON...OR 30 MILES NORTH OF ALLIANCE. THE STORM WAS MOVING NORTH AT 20 MPH AND SHOULD REMAIN EAST OF CHADRON AS IT MOVES THROUGH FAR EASTERN DAWES COUNTY. BRIEF HEAVY RAIN...SMALL HAIL AND STRONG GUSTY WIND ARE POSSIBLE WITH THIS STORM AS IT MOVES THROUGH THE NORTHERN PANHANDLE UNTIL 330 PM MDT. PEEK
Special weather statement, May 15, 2:45 PM MDT, 1 hour 27 minutes before
WYZ017-152200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 245 PM MDT WED MAY 15 1991 ...A TORNADO WATCH IS IN EFFECT FOR EXTREME SOUTHEAST WYOMING UNTIL 7PM THIS EVENING... THUNDERSTORMS HAVE DEVELOPED IN NORTHEAST COLORADO THIS AFTERNOON. AT 240PM STRONG STORMS WERE LOCATED ABOUT 20 MILES SOUTHWEST OF CHEYENNE MOVING NORTHWEST AT 25 MILE AN HOUR. AT THIS SPEED...THEY SHOULD MOVE INTO THE CHEYENNE AREA WITHIN THE HOUR. THESE STORMS COULD PRODUCE HAIL...STRONG WINDS AND BRIEF HEAVY RAIN. PEOPLE IN AND AROUND CHEYENNE ARE URGED TO KEEP AN EYE ON THE WEATHER AND TO BE PREPARED TO MOVE TO A SAFE PLACE IN CASE THREATENING WEATHER APPROACHES. A TORNADO WATCH IES IN EFFECT FOR EXTREME SOUTHEAST WYOMING UNTIL 7PM THIS EVENING. A FLASH FLOOD WATCH REMAINS IN EFFECT FOR SOUTHEAST WYOMING UNTIL 10PM THIS EVENING. CGB
Special weather statement, May 15, 2:48 PM MDT, 1 hour 24 minutes before
WYZ017-152200- SPECIAL WEATHER STATEMENT...CORRECTED NATIONAL WEATHER SERVICE CHEYENNE WY 247 PM MDT WED MAY 15 1991 ...A TORNADO WATCH IS IN EFFECT FOR EXTREME SOUTHEAST WYOMING UNTIL 7PM THIS EVENING... THUNDERSTORMS HAVE DEVELOPED IN NORTHEAST COLORADO THIS AFTERNOON. AT 240PM STRONG STORMS WERE LOCATED ABOUT 20 MILES SOUTHEAST OF CHEYENNE MOVING NORTHWEST AT 25 MILE AN HOUR. AT THIS SPEED...THEY SHOULD MOVE INTO THE CHEYENNE AREA WITHIN THE HOUR. THESE STORMS COULD PRODUCE HAIL...STRONG WINDS AND BRIEF HEAVY RAIN. PEOPLE IN AND AROUND CHEYENNE ARE URGED TO KEEP AN EYE ON THE WEATHER AND TO BE PREPARED TO MOVE TO A SAFE PLACE IN CASE THREATENING WEATHER APPROACHES. A TORNGADO WATCH IS IN EFFECT FOR EXTREME SOUTHEAST WYOMING UNTIL 7PM THIS EVENING. A FLASH FLOOD WATCH REMAINS IN EFFECT FOR SOUTHEAST WYOMING UNTIL 10PM THIS EVENING. CGB
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 15, 12:50 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Laramie | 40 min |
| May 15, 2:56 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 64 min |
| May 15, 3:58 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 62 min |
| May 15, 5:01 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie, Platte | 59 min |
Nearby
Flash Flood Warnings in Wyoming, 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.