Alert archive / Utah / Flash Flood Warnings in 1987
Flash Flood Warning 3, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 24, 1987, 7:48 PM MDT for Duchesne County, Uintah County, Utah. It was in force for 117 min.
The area
The counties it named.
The facts
- Issued
- Aug 24, 1987, 7:48 PM MDT (01:48 UTC)
- Expired
- Aug 24, 1987, 9:45 PM MDT
- In force
- 117 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Whole counties
Counties Duchesne County, UT, Uintah County, UT
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
Grand Junction, CO (KGJT), launched 00:00Z, 1.8 hours before the alert went out and 174 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
- 338 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 943 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KSLC 250148
FFWSLC
UTC013-047-250345-
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
748 PM MDT MON AUG 24 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 945 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN NORTHEAST UTAH
...EASTERN DUCHESNE...UINTAH
THE UTAH HIGHWAY PATROL REPORTS PORTIONS OF HIGHWAY 40 UNDER 6 INCHES
OF WATER IN THE BRIDGELAND AREA. HEAVY RAINFALL IS EXPECTED TO
CONTINUE OVER THE WARNING AREA FOR THE NEXT 2 HOURS. THE HEAVIEST
THUNDERSHOWERS WERE LOCATED OVER EASTERN DUCHESNE COUNTY...AND WERE
MOVING SLOWLY EASTWARD INTO UINTAH COUNTY.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS
THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT. TO ESCAPE RIS9ING WATER MOVE UP TO HIGHER GROUND.
ERC/PD....0145Z.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, Aug 24, 3:20 PM MDT, 4 hours 28 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY 320 PM MDT MON AUG 24 1987 ...NUMEROUS THUNDERSHOWERS DEVELOPING AGAIN OVER UTAH... THUNDERSHOWERS WERE DEVELOPING RAPIDLY OVER MUCH OF UTAH AGAIN EARLY THIS AFTERNOON. THE MOST ACTIVE AREA IS IN THE WESTERN HALF OF THE STATE AND OVER THE SOUTHERN MOUNTAINS. AN UPPER LEVEL DISTURBANCE MOVING OUT OF NEVADA WAS ENHANCING THE ACTIVITY IN THESE AREAS. GRANTSVILLE REPORTED A HALF INCH OF RAIN IN A 25 MINUTE LONG SHOWER ABOUT 2 PM AND SHORTLY AFTER THAT BRIEF HEAVY RAIN AND SMALL HAIL WERE REPORTED AT THE HIGHWAY PATROL CHECKING STATION SOUTH OF ST. GEORGE. THE AIRMASS OVER THE STATE REMAINS VERY MOIST AND UNSTABLE. THUS THE POTENTIAL FOR LOCALLY HEAVY SHOWERS AND SMALL HAIL EXISTS ANYWHERE IN THE STATE. FREQUENT LIGHTNING IS ALSO LIKELY WITH SOME OF THESE THUNDERSTORMS. THIS THREAT WILL CONTINUE INTO THE EVENING HOURS THEN PERSONS ENGAGED IN OUTDOOR ACTIVITIES SHOULD BE PREPARED TO TAKE COVER IF THESE THUNDERSTORMS APPROACH THEIR AREA. FURTHER STATEMENTS WILL BE ISSUED AS NEEDED. DRS...2119Z
Special weather statement, Aug 24, 3:33 PM MDT, 4 hours 15 minutes before
SPECIAL WEATHER STATEMENT...CORRECTION NATIONAL WEATHER SERVICE SALT LAKE CITY 310 PM MDT MON AUG 24 1987 ...NUMEROUS THUNDERSHOWERS DEVELOPING AGAIN OVER UTAH... THUNDERSHOWERS WERE DEVELOPING RAPIDLY OVER MUCH OF UTAH AGAIN EARLY THIS AFTERNOON. THE MOST ACTIVE AREA IS IN THE WESTERN HALF OF THE STATE AND OVER THE SOUTHERN MOUNTAINS. AN UPPER LEVEL DISTURBANCE MOVING OUT OF NEVADA WAS ENHANCING THE ACTIVITY IN THESE AREAS. GRANTSVILLE REPORTED A HALF INCH OF RAIN IN A 25 MINUTE LONG SHOWER ABOUT 2 PM AND SHORTLY AFTER THAT BRIEF HEAVY RAIN AND SMALL HAIL WERE REPORTED AT THE HIGHWAY PATROL CHECKING STATION SOUTH OF ST. GEORGE. THE AIRMASS OVER THE STATE REMAINS VERY MOIST AND UNSTABLE. THUS THE POTENTIAL FOR LOCALLY HEAVY SHOWERS AND SMALL HAIL EXISTS ANYWHERE IN THE STATE. FREQUENT LIGHTNING IS ALSO LIKELY WITH SOME OF THESE THUNDERSTORMS. THIS THREAT WILL CONTINUE INTO THE EVENING HOURS THEN GRADUALLY DECREASE FROM THE WEST ATER TONIGHT. PERSONS ENGAGED IN OUTDOOR ACTIVITIES SHOULD BE PREPARED TO TAKE COVER IF THESE THUNDERSTORMS APPROACH THEIR AREA. FURTHER STATEMENTS WILL BE ISSUED AS NEEDED. DRS...2112Z ...CORRECTION FOR MISSING LINE 3RD PARAGRAPH...
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 25, 1:05 PM MDT | Tornado Warning | SLC | Cache | 55 min |
Nearby
Flash Flood Warnings in Utah, 1987Every flash flood warning in 1987
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.