Alert archive / Wyoming / Flash Flood Warnings in 1991
Flash Flood Warning 16, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Jun 21, 1991, 6:59 PM MDT for Albany County, Wyoming. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Jun 21, 1991, 6:59 PM MDT (00:59 UTC)
- Expired
- Jun 21, 1991, 11:00 PM MDT
- In force
- 4 hr
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Albany County, WY
The nearest sounding before it
Lander/Hunt Fiel, WY (KLND), launched 00:00Z, 1.0 hours before the alert went out and 277 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
- 759 J/kg
- Mixed-layer CIN
- -141 J/kg
- Mixed-layer LCL
- 2029 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 227 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.6
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 21, 2:04 PM MDT, 4 hours 55 minutes before
WYZ016-212104- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 204 PM MDT FRI JUN 21 1991 ...STRONG THUNDERSTORMS WERE DEVELOPING BETWEEN THE LARAMIE AND SNOWY RANGES IN SOUTHEASTERN WYOMING... AT 155 PM MDT...NATIONAL WEATHER SERVICE RADAR INDICATED STRONG THUNDERSTORMS IN EAST CENTRAL CARBON COUNTY. THE STRONGEST CELL WAS LOCATED 45 MILES NORTHWEST OF LARAMIE...WHICH IS APPROXIMATELY 10 MILES NORTH OF ARLINGTON. THE STORMS WERE MOVING NORTHWEST AT 20 MILES AN HOUR. THESE THUNDERSTORMS WILL LIKELY PRODUCE HEAVY RAIN...PEA SIZED HAIL ...FREQUENT LIGHTNING...AND STRONG WINDS. IF THIS STORM APPROACHES ...MOVE TO A SAFE SHELTER IMMEDIATELY. PEOPLE IN EASTERN WYOMKING ARE ALSO REMINDED THAT A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM MDT THIS EVENING. VIRGILLITO
Special weather statement, Jun 21, 3:19 PM MDT, 3 hours 40 minutes before
WYZ016-212220- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 318 PM MDT FRI JUN 21 1991 ...THUNDERSTORMS CONTINUED TO DEVELOP BETWEEN THE LARAMIE AND SNOWY RANGES IN SOUTHEASTERN WYOMING... AT 310 PM MDT...THUNDERSTORMS CONTINUED TO DEVELOP IN EAST CENTRAL CARBON COUNTY AND WEST CENTRAL ALBANY COUNTY. THE STRONGEST CELL WAS LOCATED BETWEEN ARLINGTON AND ROCK RIVER...WHICH IS APPROXIMATELY 38 MILES NORTHWEST OF LARAMIE. THESE STORMS WERE SHOWING LITTLE IF ANY MOVEMENT. THESE THUNDERSTORMS WILL LIKELY PRODUCE HEAVY RAIN...PEA SIZED HAIL ...FREQUENT LIGHTNING...AND STRONG WINDS. FLOODING OF LOW LYING AREAS AND ROADS IS ALSO LIKELY DUE TO THE SLOW MOVEMENT OF THESE STORMS. IF THESE STORMS APPROACH YOU...MOVE TO A SAFE SHELTER IMMEDIATELY. < PEOPLE IN EASTERN WYOMING ARE ALSO REMINDED THAT A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM MDT THIS EVENING. VIRGILLITO
Special weather statement, Jun 21, 3:41 PM MDT, 3 hours 18 minutes before
WYZ017-212240- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 340 PM MDT FRI JUN 21 1991 ...A STRONG THUNDERSTORM WAS MOVING INTO SOUTH CENTRAL LARAMIE COUNTY FROM COLORADO... AT 335 PM MDT...RADAR INDICATED A STRONG THUNDERSTORM ALONG THE COLORADO/WYOMING BORDER ABOUT 10 MILES SOUTHWEST OF CHEYENNE. THIS STORM WAS MOVING NORTHEAST AT 15 MILES AN HOUR AND WILL REACH THE SOUTHERN OUTSKIRTS OF CHEYENNE BY 350 PM MDT. PEOPLE IN CHEYENNE AND THE SURROUNDING AREA CAN EXPECT HEAVY RAIN... PEA SIZED HAIL...FREQUENT LIGHTNING...AND STRONG WINDS AS THIS STORM MOVES THROUGH THE CITY. BE PREPARED TO MOVE TO A SAFE SHELTER AS THIS STORM MAY INTENSIFY. VIRGILLITO
Special weather statement, Jun 21, 3:45 PM MDT, 3 hours 14 minutes before
WYZ017-212240- SPECIAL WEATHER STATEMENT...CORRECTED NATIONAL WEATHER SERVICE CHEYENNE WY 345 PM MDT FRI JUN 21 1991 ...A STRONG THUNDERSTORM WAS MOVING INTO SOUTH CENTRAL LARAMIE COUNTY FROM COLORADO... AT 335 PM MDT...RADAR INDICATED A STRONG THUNDERSTORM ALONG THE COLORADO/WYOMING BORDER ABOUT 10 MILES SOUTHWEST OF CHEYENNE. THIS STORM WAS MOVING NORTHEAST AT 15 MILES AN HOUR AND WILL REACH THE SOUTHERN OUTSKIRTS OF CHEYENNE BY 350 PM MDT. PEOPLE IN CHEYENNE AND THE SURROUNDING AREA CAN EXPECT HEAVY RAIN... PEA SIZED HAIL...FREQUENT LIGHTNING...AND STRONG WINDS AS THIS STORM MOVES THROUGH THE CITY. BE PREPARED TO MOVE TO A SAFE SHELTER AS THIS STORM MAY INTENSIFY. PEOPLE IN EASTERN WYOMING ARE ALSO REMINDED THAT A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM MDT THIS EVENING. CORRECTED TO INCLUDE SEVERE THUNDERSTORM WATCH VIRGILLITO
Special weather statement, Jun 21, 6:27 PM MDT, 32 minutes before
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<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
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<p id="message2">
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</html>The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 5:57 PM MDT | Tornado Warning | CYS | Cheyenne, Morrill | 28 min |
| Jun 21, 7:16 PM MDT | Flash Flood Warning | CYS | Albany | 4 hr |
| Jun 21, 7:59 PM MDT | Flash Flood Warning | CYS | Albany, Platte | 4 hr |
| Jun 22, 2:12 PM MDT | Tornado Warning | CYS | Laramie | 48 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.