Alert archive / Wyoming / Flash Flood Warnings in 1996

Flash Flood Warning 3, NWS Cheyenne, WY

July 23, 1996Laramie County, Wyoming

NWS Cheyenne, WY issued this flash flood warning at Jul 23, 1996, 4:05 PM MDT for Laramie County, Wyoming. It was in force for 25 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 23, 1996, 4:05 PM MDT (22:05 UTC)
Expired
Jul 23, 1996, 4:30 PM MDT
In force
25 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Laramie County, WY

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 10.1 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 12:00Z on 1996-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 711 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 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 12:00Z on 1996-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 square meters per square second.19395878Sfc1 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
711 J/kg
Mixed-layer CIN
-291 J/kg
Mixed-layer LCL
1597 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

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, Jul 23, 10:05 AM MDT, 6 hours before
WYZ059>070-NEZ001>03-019>021-054-055-232300-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
1005 AM MDT TUE JUL 23 1996

THE SEVERE WEATHER POTENTIAL IN THE COUNTY WARNING AREA OF THE CHEYENNE
NATIONAL WEATHER SERVICE OFFICE IS LOW THIS AFTERNOON AND EVENING.

SPOTTER ACTIVATION MAY BE NECESSARY THIS AFTERNOON AND EVENING.

DISCUSSION...ABUNDANT LOW LEVEL MOISTURE PERSISTS OVER SOUTHEAST
WYOMING AND THE WESTERN NEBRASKA PANHANDLE.  A DISTURBANCE IN THE UPPER
ATMOSPHERE WILL BE APPROACHING FROM THE NORTHWEST THIS AFTERNOON.
WIDELY SCATTERED THUNDERSTORMS WILL DEVELOP OVER SOUTHEAST WYOMING AND
THE WESTERN NEBRASKA PANHANDLE THIS AFTERNOON.  THEY WILL ENCOUNTER
GREATER INSTABILITIES AS THEY MOVE THROUGH THE PANHANDLE AND COULD
STRENGTHEN QUICKLY.

THIS OUTLOOK IS FOR THE FOLLOWING COUNTIES IN SOUTHEAST WYOMING AND
THE NEBRASKA PANHANDLE.
<
WY...ALBANY...CARBON...CONVERSE...GOSHEN...LARAMIE...NIOBRARA...PLATTE

NE...BANNER   BOX BUTTE   CHEYENNE   DAWES   KIMBALL   MORRILL   SIOUX
     SCOTTS BLUFF

WCJIN-WYSE-WYNE

COX
Special weather statement, Jul 23, 1:50 PM MDT, 2 hours 15 minutes before
WYZ062>066-069-232030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
150 PM MDT TUE JUL 23 1996

...THUNDERSTORMS WERE DEVELOPING OVER PARTS OF SOUTHEAST WYOMING...

SCATTERED THUNDERSTORMS HAD DEVELOPED MAINLY OVER ALBANY COUNTY IN
SOUTHEAST WYOMING EARLY THIS AFTERNOON.  ALL OF THE THUNDERSTORMS
WERE MOVING SOUTHEAST ABOUT 20 MPH.

AT 145 PM MDT...THE STRONGEST THUNDERSTORM WAS 15 MILES SOUTHEAST OF
LARAMIE...IN THE SOUTHEAST CORNER OF ALBANY COUNTY.  BRIEF HEAVY RAIN
...GUSTY WINDS AND DEADLY LIGHTNING WERE LIKELY WITH THIS STORM.  IT
WILL MOVE INTO EXTREME NORTHERN COLORADO AROUND 215 PM.

IF A THUNDERSTORM APPROACHES YOUR LOCATION...GET TO A SAFE PLACE
IMMEDIATELY...AND INDOORS IF POSSIBLE.

WCJIN-WYSE

JLH
Special weather statement, Jul 23, 2:39 PM MDT, 1 hour 26 minutes before
WYZ065-066-067-069-232115-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
238 PM MDT TUE JUL 23 1996

...THUNDERSTORMS WERE RUMBLING OVER PARTS OF SOUTHEAST WYOMING...

THERE WERE SCATTERED THUNDERSTORMS OVER EXTREME SOUTHEAST WYOMING AT
235 PM MDT.  MOST OF THE STORMS WERE ALONG AND SOUTH OF INTERSTATE 80
BETWEEN CHEYENNE AND THE SUMMIT EAST OF LARAMIE.

THE STRONGEST THUNDERSTORM WAS ABOUT 15 MILES WEST OF CHEYENNE...
MOVING SOUTHEAST AT 20 MPH.  THE MAIN PART OF THIS STORM WILL LIKELY
PASS JUST SOUTHWEST BY 3 PM MDT.

SHOULD A THUNDERSTORM APPROACH YOUR AREA...GET TO A SAFE PLACE
IMMEDIATELY.

WCJIN-WYSE

JLH
Special weather statement, Jul 23, 2:41 PM MDT, 1 hour 24 minutes before
WYZ065-066-067-069-232115-

SPECIAL WEATHER STATEMENT...CORRECTED
NATIONAL WEATHER SERVICE CHEYENNE WY
238 PM MDT TUE JUL 23 1996

...THUNDERSTORMS WERE RUMBLING OVER PARTS OF SOUTHEAST WYOMING...

THERE WERE SCATTERED THUNDERSTORMS OVER EXTREME SOUTHEAST WYOMING AT
235 PM MDT.  MOST OF THE STORMS WERE ALONG AND SOUTH OF INTERSTATE 80
BETWEEN CHEYENNE AND THE SUMMIT EAST OF LARAMIE.

THE STRONGEST THUNDERSTORM WAS ABOUT 15 MILES WEST OF CHEYENNE...
MOVING SOUTHEAST AT 20 MPH.  THE MAIN PART OF THIS STORM WILL LIKELY
PASS JUST SOUTHWEST OF CHEYENNE BY 3 PM MDT.

SHOULD A THUNDERSTORM APPROACH YOUR AREA...GET TO A SAFE PLACE
IMMEDIATELY.

WCJIN-WYSE
<
CORRECTED TYPO IN MIDDLE PARAGRAPH.

JLH
Special weather statement, Jul 23, 3:26 PM MDT, 39 minutes before
WYZ065-066-067-069-232200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
325 PM MDT TUE JUL 23 1996

...A FEW THUNDERSTORMS CONTINUED OVER PARTS OF SOUTHEAST WYOMING...

WIDELY SCATTERED THUNDERSTORMS WERE STILL OCCURRING IN PARTS OF
SOUTHEAST WYOMING AT 320 PM MDT.  THE STRONGEST OF THESE STORMS WAS
PASSING THROUGH THE SOUTHWEST EDGE OF CHEYENNE AND WAS STILL MOVING
SOUTHEAST AT 20 MPH.  THIS THUNDERSTORM WILL CONTINUE TO BRING HEAVY
RAIN...DEADLY LIGHTNING AND SOME SMALL HAIL TO THE FAR SOUTHWEST AND
SOUTH SIDES OF CHEYENNE UNTIL 340 PM MDT.

OTHER...BUT WEAKER...THUNDERSTORMS WERE LOCATED 15 MILES EAST OF
LARAMIE AND JUST WEST OF WHEATLAND AT 320 PM MDT.  TLHESE STORMS WERE
ALSO MOVING SOUTHEAST AT 20 MPH.

SHOULD A THUNDERSTORM APPROACH YOUR AREA...GET TO A SAFE PLACE
IMMEDIATELY.

WCJIN-WYSE

JLH

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 4:05 PM MDTSevere Thunderstorm WarningCYSLaramie25 min

Nearby

Flash Flood Warnings in Wyoming, 1996Every flash flood warning in 1996

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.