Alert archive / Wyoming / Flash Flood Warnings in 1991

Flash Flood Warning 15, NWS Cheyenne, WY

June 6, 1991Platte County, Wyoming

NWS Cheyenne, WY issued this flash flood warning at Jun 6, 1991, 8:53 PM MDT for Platte County, Wyoming. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Jun 6, 1991, 8:53 PM MDT (02:53 UTC)
Expired: Jun 7, 1991, 12:00 AM MDT
In force: 3 hr
Issued by: NWS Cheyenne, WY
Area: Whole counties

County Platte County, WY

The nearest sounding before it

Lander/Hunt Fiel, WY (KLND), launched 00:00Z, 2.9 hours before the alert went out and 316 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 21 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 6, 5:51 PM MDT, 3 hours 2 minutes before

WYZ012-017-070100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
550 PM MDT THU JUN 6 1991

...A FLASH FLOOD WATCH IS IN EFFECT FOR EASTERN WYOMING TONIGHT...

SHOWERS AND THUNDERSTORMS HAVE DEVELOPED IN SOUTHEAST WYOMING AGAIN
THIS AFTERNOON.  THE STRONGEST WERE IN SOUTHEAST LARAMIE COUNTY...
MOVING NORTH AROUND 25 MILES AN HOUR.

LOCAL BRIEF HEAVY RAIN...DANGEROUS LIGHTNING...GUSTY WINDS...AND HAIL
ARE POSSIBLE WITH THESE STORMS.  IN ADDITION...A FLASH FLOOD WATCH
REMAINS IN EFFECT TONIGHT FOR EASTERN WYOMING.  PEOPLE IN THIS PART OF
THE STATE ARE ADVISED TO BE ON THE ALERT FOR ADVERSE WEATHER...AND FOR
HIGH WATER CONDITIONS.

IF THREATENING WEATHER APPROACHES...TAKE' SHELTER IN DOORS IF AT ALL
POSSIBLE.  IN THE EVENT OF FLOODING CONDITIONS...MOVE TO HIGHER GROUND.
DO NOT ATTEMPT TO DRIVE THROUGH FLOODED...LOW LYING AREAS.

CG

Special weather statement, Jun 6, 8:35 PM MDT, 18 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 6, 6:21 PM MDT	Tornado Warning	CYS	Albany	39 min
Jun 7, 2:25 PM MDT	Severe Thunderstorm Warning	CYS	Albany	35 min

Nearby

Flash Flood Warnings in Wyoming, 1991 Every 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.