Alert archive / Wyoming / Flash Flood Warnings in 1991

Flash Flood Warning 12, NWS Cheyenne, WY

June 2, 1991Laramie County, Wyoming

NWS Cheyenne, WY issued this flash flood warning at Jun 2, 1991, 8:10 PM MDT for Laramie County, Wyoming. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jun 2, 1991, 8:10 PM MDT (02:10 UTC)
Expired
Jun 2, 1991, 11:00 PM MDT
In force
3 hr
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Laramie County, WY

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 2.2 hours before the alert went out and 202 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.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 00:00Z on 1991-06-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 1991-06-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -45 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1410 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
-45 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

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 2, 3:44 PM MDT, 4 hours 26 minutes before
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Special weather statement, Jun 2, 4:20 PM MDT, 3 hours 50 minutes before
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Special weather statement, Jun 2, 4:58 PM MDT, 3 hours 12 minutes before
WYZ016-017-022345-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
457 PM MDT SUN JUN 2 1991

...THUNDERSTORMS CONTINUED TO INTENSIFY OVER SOUTHEAST WYOMING AT
455 PM...

SCATTERED STORMS HAD DEVELOPED OVER MUCH OF SOUTHEAST WYOMING LATE THIS
AFTERNOON.  THE STORMS WERE MOST NUMEROUS IN LARAMIE COUNTY...ESPECIALLY
IN EASTERN SECTIONS.  THEY WERE MOVING NORTHWEST AT ABOUT 25 MILES AN
HOUR.

THE STRONGEST STORM WAS 25 TO 35 MILES EAST OF CHEYENNE...NEAR PINE
BLUFFS.  A LARGE THUNDERSTORM COMPLEX IN FAR NORTHERN COLORADO WAS
ALSO APPROACHING LARAMIE COUNTY FROM THE SOUTH AT 450 PM.  SO FAR...
ONLY PEA SIZE HAIL AND BRIEF HEAVY RAIN HAVE BEEN REPORTED WITH THESE
THUNDERSTORMS.

PEOPLE IN SOUTHEAST WYOMING SHOULD BE ON THE LOOKOUT FOR THUNDERSTORMS
PRODUCING HAIL...HEAVY RAIN...AND DEADLY LIGHTNING.  A SEVERE THUNDER-
STORM WATCH REMAINS IN EFFECT UNTIL 8 PM.  ALSO...A FLASH FLOOD WATCH
IS IN EFFECT UNTIL 2 AM.  IFN THREATENING WEATHER APPROACHES...GO TO A
SAFE PLACE AND WAIT FOR THE STORMS TO PASS.  THE HEAVY RAINS MAY CAUSE
FLOODING OF STREAMS AND LOW LYING AREAS.

JAD
Special weather statement, Jun 2, 6:17 PM MDT, 1 hour 53 minutes before
NEZ001-005-011-020130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
615 PM MDT SUN JUN 2 1991

...THUNDERSTORMS OVER THE SOUTHWEST NEBRASKA PANHANDLE...

AT 610 PM MDT...RADAR INDICATED THUNDERSTORMS SCATTERED ACROSS WESTERN
KIMBALL...WESTERN BANNER AND SOUTHWEST SCOTTS BLUFF COUNTIES OF THE
SOUTHERN AND CENTRAL NEBRASKA PANHANDLE.  THE STRONGEST STORM WAS 35
MILES SOUTHWEST OF SCOTTSBLUFF NEBRASKA OVER WESTERN BANNER COUNTY OF
THE CENTRAL NEBRASKA PANHANDLE.  ALL THE STORM 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 KIMBALL...BANNER AND
SCOTTS BLUFF COUNTIES OF THE NEBRASKA PANHANDLE UNTIL 730 PM MDT.

AT 6 PM MDT SKIES WERE MOSTLY CLOUDY TO CLOUDY ACROSS THE NEBRASKA
PANHANDLE WITH TEMPERATURES RANGEING FROM 71 DEGREES AT SIDNEY TO 77
DEGREES AT CHADRON NEBRASKA.  THE WIND WAS GENERALLY FROM THE SOUTH!EAST
AT 10 TO 20 MPH WITH SOME GUSTS TO 30 MPH.
KIRK
Special weather statement, Jun 2, 7:29 PM MDT, 41 minutes before
NEZ001-005-011-020230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
725 PM MDT SUN JUN 2 1991

...THUNDERSTORMS OVER THE SOUTHWEST NEBRASKA PANHANDLE...

AT 725 PM MDT...RADAR INDICATED THUNDERSTORMS SCATTERED ACROSS KIMBALL
...BANNER AND SOUTHWEST SCOTTS BLUFF COUNTIES OF THE SOUTHERN AND
CENTRAL NEBRASKA PANHANDLE.  THE STRONGEST STORM WAS 35 MILES SOUTH OF
SCOTTSBLUFF NEBRASKA OVER THE BANNER/KIMBALL COUNTY LINE.  ALL THE
STORMS WERE MOVING TO THE NORTHWEST AT 25 MPH.

AT 720 PM MDT KIMBALL COUNTY CIVIL DEFENSE REPORTED VERY HEAVY RAIN AND
1/4 TO 1/2 INCH HAIL ON INTERSTATE 80 NEAR BUSHNELL OR 45 MILES WEST OF
SIDNEY NEBRASKA.

BRIEF HEAVY RAIN...STRONG GUSTY WINDw AND HAIL ARE POSSIBLE WITH THESE
STORMS AS THEY MOVE NORTHWEST ACROSS KIMBALL...BANNER AND SCOTTS BLUFF
COUNTY OF THE NEBRASKA PANHANDLE UNTIL 830 PM MDT.
KIRK
Special weather statement, Jun 2, 7:44 PM MDT, 26 minutes before
WYZ012-030215-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
744 PM MDT SUN JUN 2 1991

...A STRONG THUNDERSTORM WAS MOVING INTO THE LA GRANGE AREA OF SOUTHERN
GOSHEN COUNTY AT 740 PM...

RADAR SHOWED A STRONG THUNDERSTORM ABOUT 30 MILES SOUTH OF TORRINGTON
MOVING RIGHT TOWARDS THE TOWN OF LA GRANGE.  HAIL...GUSTY WINDS...AND
VERY HEAVY RAIN ARE LIKELY WITH THIS STORM.

PEOPLE IN SOUTHERN GOSHEN COUNTY...ESPECIALLY IN LA GRANGE...SHOULD GO
TO A SAFE PLACE SUCH AS A BASEMENT AND WAIT FOR THE STORM TO PASS.

JAD

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 3, 12:52 PM MDTSevere Thunderstorm WarningCYSBox Butte, Dawes38 min
Jun 3, 1:23 PM MDTTornado WarningCYSSioux37 min
Jun 3, 1:56 PM MDTSevere Thunderstorm WarningCYSDawes34 min
Jun 3, 4:49 PM MDTTornado WarningCYSBanner26 min
Jun 3, 5:09 PM MDTSevere Thunderstorm WarningCYSSheridan36 min
Jun 3, 5:20 PM MDTTornado WarningCYSBanner25 min
Jun 2, 8:38 PM MDTFlash Flood WarningCYSGoshen2 hr
Jun 2, 10:55 PM MDTFlash Flood WarningCYSGoshen, Laramie2 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.