Alert archive / Utah / Flash Flood Warnings in 1991
Flash Flood Warning 4, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 3, 1991, 4:33 PM MDT for Garfield County, Utah. It was in force for 117 min.
The area
The counties it named.
The facts
- Issued
- Aug 3, 1991, 4:33 PM MDT (22:33 UTC)
- Expired
- Aug 3, 1991, 6:30 PM MDT
- In force
- 117 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Whole counties
County Garfield County, UT
The nearest sounding before it
Grand Junction, CO (KGJT), launched 12:00Z, 10.6 hours before the alert went out and 293 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1443 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 27 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 032235 FFWSLC UTC017-040030- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SALT LAKE CITY UT 433 PM MDT SAT AUG 3 1991 THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 630 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATION...... IN SOUTH CENTRAL UTAH ...CENTRAL AND EASTERN GARFIELD COUNTY VERY HEAVY RAIN THE PAST 1-2 HOURS HAS CAUSED WIDESPREAD MUDSLIDES AND FLOODING IN THE CANYONS AROUND THE ESCALANTE AND BOULDER AREAS OF GARFIELD COUNTY. HEAVY RAINS CONTINUE AT THIS TIME AND A WORSENING FLOOD SITUATION IS EXPECTED FOR THE NEXT COUPLE OF HOURS. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND.
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 3, 1:53 PM MDT, 2 hours 40 minutes before
UTZALL-040000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 145 PM MDT SAT AUG 3 1991 ...STRONG THUNDERSTORMS OVER SOUTHWESTERN UTAH THIS AFTERNOON... STRONG THUNDERSTORMS HAVE DEVELOP OVER MUCH OF SOUTHWESTERN UTAH EARLY THIS AFTERNOON. THE STRONGEST STORMS WERE ALONG THE NEVADA/UTAH BORDER FROM ABOUT 70 MILES SOUTH OF WENDOVER TO JUST NORTHWEST OF MILFORD. ANOTHER AREA OF STRONG THUNDERSTORMS ARE OVER THE SOUTHERN MOUNTAINS FROM JUST EAST OF CEDAR CITY TO NEAR MANTI UTAH. ALL STORMS WERE MOVING TO THE NORTH-NORTHEAST AROUND 15 MPH. RADAR INDICATES THAT THESE STORMS ARE PRODUCING LIGHT TO MODERATE AMOUNTS OF RAIN. BECAUSE OF THE SLOW MOVEMENT OF THESE STORMS... RAINFALLS IN THE ONE QUARTER TO ONE HALF INCH RANGE ARE POSSIBLE IN A SHORT PERIOD OF TIME. THESE RAINFALLS COULD PRODUCE SOME LOCALIZED FLOODING OF ROADWAYS AND IN LOW LYING AREAS PRONE TO FLOODING. THESE STORMS ARE ALSO PRODUCING FREQUENT CLOUD-TO-GROUND LIGHTNING. IF STORMS APPROACH...SEEK SHELTER IMMEDIATELY TO AVOID BEING STRUCK BY LIGHTNING. THIS AFTERNOONS THUNDERSTORM ACTIVITY WILL CONTINUE TO MOVE NORTHWARD THROUGH THIS EVENING. THUNDERSTORMS SHOULD REACH THE WASATCH FRONTt LATE THIS AFTERNOON AND WILL STILL BE PACKING FREQUENT LIGHTNING AND BRIEF HEAVY RAINFALLS. FURTHER STATEMENTS WILL ISSUED AS NECESSARY. MCC...1945Z
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 3:28 PM MDT | Severe Thunderstorm Warning | SLC | Juab | 47 min |
| Aug 3, 5:52 PM MDT | Flash Flood Warning | SLC | Wayne | 68 min |
Nearby
Flash Flood Warnings in Utah, 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.