Alert archive / Wyoming / Flash Flood Warnings in 1991
Flash Flood Warning 9, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Jun 1, 1991, 7:50 PM MDT for Albany County, Laramie County, Wyoming. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Jun 1, 1991, 7:50 PM MDT (01:50 UTC)
- Expired
- Jun 2, 1991, 12:00 AM MDT
- In force
- 4 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 00:00Z, 1.8 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
- 1289 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -342 m²/s²
- 0-3 km storm-relative helicity
- -213 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -4.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KCYS 020151 FFWCYS WYC001-021-020600- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 750 PM MDT SAT JUN 1 1991 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL MIDNIGHT THIS SATURDAY EVENING FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTHEAST WYOMING ...SOUTHERN ALBANY COUNTY...AND ALL OF LARAMIE COUNTY AT 745 PM MDT...STRONG THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED TO DEVELOP OVER EXTREME SOUTHEAST WYOMING. WIDESPREAD STREET FLOODING WAS OCCURRING IN BOTH LARAMIE AND CHEYENNE. DUCK CREEK 20 MILES WEST SOUTHWEST OF CHEYENNE WAS REPORTED OUT OF IT'S BANKS. THESE STRONG THUNDERSTORMS WITH HEAVY RAIN WILL CONTINUE OVER EXTREME SOUTHEAST WYOMING THROUGH MIDNIGHT. THERFORE...THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL MIDNIGHT FOR ALL OF LARAMIE COUNTY AND SOUTHERN ALBANY COUNTY IN SOUTHEAST WYOMING. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT. IT'S IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS. CAMPERS SHOULD AVOID CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS. 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. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND. VIRGILLITO
What 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, Jun 1, 3:50 PM MDT, 4 hours before
WYZ013-014-012245- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 349 PM MDT SAT JUN 1 1991 SCATTERED THUNDERSTORMS CONTINUED OVER SOUTHWEST WYOMING AT 340 PM. A FEW OF THE STORMS WERE LIKELY PRODUCING HEAVY RAIN AND SMALL HAIL ...AS WELL AS DEADLY LIGHTNING. SINCE THE THUNDERSTORMS WERE MOVING NORTHWEST AT ONLY 15 MILES AN HOUR...SOME FLOODING OF LOW LYING AREAS MAY ALSO OCCUR. THUNDERSTORMS WILL CONTINUE OVER SOUTHWEST WTYOMING THROUGH THE EVENING HOURS. PEOPLE IN SOUTHWEST WYOMING SHOULD KEEP AN EYE ON THE SKY THIS AFTERNOON AND EVENING. SHOULD A THUNDERSTORM APPROACH YOUR AREA... SEEK A SAFE PLACE IMMEDIATELY...INDOORS IF POSSIBLE. HATTEN
Special weather statement, Jun 1, 5:23 PM MDT, 2 hours 27 minutes before
WYZ015-016-017-020000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 523 PM MDT SAT JUN 1 1991 ...SOME STRONG THUNDERSTORMS WERE STARTING TO DEVELOP OVER SOUTHEAST WYOMING AT 520 PM... SCATTERED THUNDERSTORMS WERE DEVELOPING AT 520 PM OVER THE SOUTHERN PARTS OF ALBANY AND LARAMIE COUNTIES. THE STRONGEST STORM WAS LOCATED NEAR BURNS...OR ABOUT 25 MILES EAST OF CHEYENNE. OTHER STORMS WERE BECOMING QUITE STRONG OVER THE EXTREME SOUTHERN END OF THE LARAMIE MOUNTAIN RANGE...ABOUT 20 MILES SOUTHEAST OF LARAMIE. THE STORMS WERE MOVING TO THE NORTHWEST AT ABOUT 25 MILES AN HOUR. PEOPLE IN LARAMIE AND ALBANY COUNTIES SHOULD KEEP AN EYE ON THE SKY THIS EVENING. THESE STORMS WILL LIKELY PRODUCE HAIL...GUSTY WINDS... AND LOCALLY HEAVY RAINS. A FLASH FLOOD WATCH REMAINS IN EFFECT FOR THE FOOTHILLS OF THE LARAMIE AND SNOWY RANGES OVERNIGHT. JAD
Special weather statement, Jun 1, 5:34 PM MDT, 2 hours 16 minutes before
WYZ013-014-020015- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 533 PM MDT SAT JUN 1 1991 ...THUNDERSTORMS WITH HEAVY RAIN WERE MOVING THROUGH SOUTHWEST WYOMING AT 525 PM... A BAND OF THUNDERSTORMS WAS LOCATED ACROSS SOUTHWEST WYOMING AT 525 PM. THE BAND EXTENDED ACROSS MUCH OF CENTRAL AND SOUTHERN SWEETWATER COUNTY...AND ON WEST INTO UINTA AND SOUTHERN LINCOLN COUNTIES. THE MAIN WEATHER HAZARD WITH THESE STORMS HAS BEEN SOME HEAVY RAIN AND DEADALY LIGHTNING. PEA TO MARBLE SIZE HAIL WAS REPORTED AT 520 PM AT COKEVILLE...WHICH IS 30 MILES NORTHWEST OF KEMMERER. PEOPLE IN SOUTHWEST WYOMING SHOULD REMAIN ALERT TO THESE STORMS. THEY WILL CONTINUE TO PRODUCE SMALL HAIL AND HEAVY RAINS THROUGH THIS EVENING. SOME SMALL STREAMS MAY BRIEFLY OVERFLOW THEIR BANKS...AND MOTORISTS SHOULD BE ON THE LOOKOUT FOR WATER ON ROADS. JAD
Special weather statement, Jun 1, 5:47 PM MDT, 2 hours 3 minutes before
NEZ001-005-011-020030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SCOTTSBLUFF NE 545 PM MDT SAT JUN 1 1991 ...STRONG THUNDERSTORM IN THE SOUTHWESR NEBRASKA PANHANDLE... AT 540 PM MDT...RADAR INDICATED A STRONG THUNDERSTORM 5 MILES NORTHWEST OF KIMBALL OR 35 MILES NORTHWEST OF SIDNEY NEBRASKA MOVING TO THE NORTHWEST AT 25 MPH. OTHER THUNDERSHOWERS WERE SCATTERED ACROSS BANNER AND SCOTTS BLUFF COUNTIES OF THE CENTRAL AND SOUTHERN NEBRASKA PANHANDLE. BRIEF HEAVY RAIN...STRONG GUSTY WIND AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS AS THEY MOVE NORTHWEST ACROSS KIMBALL...BANNER AND SCOTTS BLUFF COUNTIES UNTIL 630 PM MDT. KIRK
Special weather statement, Jun 1, 6:36 PM MDT, 1 hour 14 minutes before
NEZ001-005-011-020130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SCOTTSBLUFF NE 635 PM MDT SAT JUN 1 1991 ...THUNDERSTORMS OVER THE SOUTHWEST NEBRASKA PANHANDLE... AT 633 PM MDT...RADAR INDICATED THUNDERSTORMS SCATTERED ACROSS CHEYENNE ...KIMBALL...BANNER AND SCOTTS BLUFF COUNTIES OF THE NEBRASKA PANHANDLE. THE STRONGEST STORM WAS 35 MILES SOUTHWEST OF SCOTTSBLUFF NEBRASKA OVER WESTERN BANNER COUNTY OF THE SOUTHERN NEBRASKA PANHANDLE. ALL THE STORMS WERE MOVING TO THE NORTHWEST AT 25 MPH. BRIEF HEAVY RAIN...STRONG GUSTY WIND AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS AS THEY MOVE NORTHWEST ACROSS CHEYENNE...KIMBALL...BANNER AND SCOTTSBLUFF COUNTIES OF THE NEBRASKA PANHANDLE[ UNTIL 730 PM MDT. KIRK
Special weather statement, Jun 1, 7:14 PM MDT, 36 minutes before
WYZ012-016-017-020600- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 715 PM MDT SAT JUN 1 1991 ...A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR EXTREME SOUTHEAST WYOMING AND IS IN EFFECT UNTIL MIDNIGHT THIS EVENING... A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR GOSHEN...LARAMIE... PLATTE...SOUTHEAST CONVERSE...EASTERN ALBANY...AND SOUTHERN NIOBRARA COUNTIES IN SOUTHEAST WYOMING. THIS WATCH IS IN EFFECT UNTIL MIDNIGHT THIS SATURDAY EVENING. PEOPLE IN THE WATCH AREA SHOULD BE PREPARED FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS. THESE STORMS WILL PRODUCE HEAVY RAIN...LARGE HAIL...DAMAGING WINDS...AND DEADLY LIGHTNING. IF A STROM APPROACHES ...SEEK SHELTER IkMMEDIATELY. DJV
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 1, 6:08 PM MDT | Tornado Warning | CYS | Laramie | 52 min |
| Jun 1, 7:00 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 60 min |
| Jun 1, 10:50 PM MDT | Flash Flood Warning | CYS | Goshen, Laramie, Platte | 2 hr |
| Jun 2, 5:33 PM MDT | Flash Flood Warning | CYS | Sweetwater | 4 hr |
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.