Alert archive / Wyoming / Flash Flood Warnings in 1988

Flash Flood Warning 1, NWS Cheyenne, WY

July 18, 1988Laramie County, Wyoming

NWS Cheyenne, WY issued this flash flood warning at Jul 18, 1988, 7:15 PM MDT for Laramie County, Wyoming. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Jul 18, 1988, 7:15 PM MDT (01:15 UTC)
Expired
Jul 18, 1988, 11:15 PM MDT
In force
4 hr
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Laramie County, WY

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 1.3 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 1988-07-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 15 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 00:00Z on 1988-07-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.193958Sfc1 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
15 J/kg
Mixed-layer CIN
-233 J/kg
Mixed-layer LCL
2390 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
15 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

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 18, 3:04 PM MDT, 4 hours 11 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
304 PM MDT MON JUL 18 1988

...TORNADO WATCH FOR SOUTHERN AND WESTERN PANHANDLE UNTIL 9 PM MDT...

AT 3 PM MDT THUNDERSTORMS WERE SCATTERED ACROSS THE NORTHERN NEBRASKA
PANHANDLE.  THE STRONGEST STORM WAS 40 MILES WEST OF CHADRON NEBRASKA
...JUST SOUTHWEST OF HARRISON NEBRASKA.  MOVEMENT WAS SOUTHEAST AT
10 MPH.  OTHER...MORE INTENSE STORMS WERE IN WYOMING.

SMALL HAIL...BRIEF HEAY RAIN AND STRONG WINDS ARE POSSIBLE WITH THE
STORMS IN THE SOUTHERN TWO THIRDS OF SIOUX COUNTY UNTIL 415 PM MDT.

TORNADO WATCH 309 WILL BE IN EFFECT FOR SIOUX...SCOTTS BLUFF...BANNER
...KIMBALL AND CHEYENNE COUNTIES UNTIL 9 PM MDT TON}IGHT.
ELSON

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 6:00 PM MDTSevere Thunderstorm WarningCYSKimball60 min
Jul 18, 7:00 PM MDTSevere Thunderstorm WarningCYSKimball35 min
Jul 18, 6:30 PM MDTSevere Thunderstorm WarningCYSLaramie60 min

Nearby

Flash Flood Warnings in Wyoming, 1988Every flash flood warning in 1988

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.