Alert archive / Utah / Flash Flood Warnings in 1991
Flash Flood Warning 2, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 1, 1991, 10:40 PM MDT for Sevier County, Utah. It was in force for 80 min.
The area
The counties it named.
The facts
- Issued
- Aug 1, 1991, 10:40 PM MDT (04:40 UTC)
- Expired
- Aug 2, 1991, 12:00 AM MDT
- In force
- 80 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Whole counties
County Sevier County, UT
The nearest sounding before it
Salt Lake City I, UT (KSLC), launched 00:00Z, 4.7 hours before the alert went out and 226 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
- 2308 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 11 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 020452 FFWSLC UTC041-020600- BULLETIN...IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SALT LAKE CITY UT 1040 PM MDT THU AUG 1 1991 THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL MIDNIGHT FOR THE NORTHERN HALF OF SEVIER COUNTY. A FLASH FLOOD WARNING MEANS FLASH FLOODING IS OCCURRING. THE UTAH HIGHWAY PATROL REPORTS FLASH FLOODING IN SALINA. THEY ESTIMATED 2 INCHES OF RAIN HAS FALLEN IN THE LAST HOUR IN SALINA. THE THUNDERSTORM THAT CAUSED THIS HEAVY RAIN IS MOVING OFF TO THE EAST AND RAINFALL SHOULD BE DECREASING SOON. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER IS COVERING THE ROAD. EC...0445Z
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 1, 5:41 PM MDT, 4 hours 59 minutes before
UTZALL-020500- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 538 PM MDT THU AUG 1 1991 ...THUNDERSHOWERS WILL CONTINUE OVER PORTIONS OF UTAH TONIGHT... A VERY MOIST AND UNSTABLE AIRMASS CONTINUES OVER MUCH OF UTAH THIS EVENING. AT 5 PM SATELLITE IMAGERY SHOWED A STRONG THUNDERSTORM MOVING OUT OF NORTHEAST GRAND COUNTY INTO COLORADO. THIS THUNDERSTORM HAD ALREADY CAUSED UNCONFIRMED GUSTS TO 67 MPH. IN ADDITION A VERY LONG LINE OF THUNDERSTORMS STRETCHES FROM JUST NORTH OF LAS VEGAS TO ABOUT DUGWAY PROVING GROUND. THIS LINE IS SHIFTING RAPIDLY NORTHEASTWARD AND DEVELOPING. THESE THUNDERSTORMS WILL BE MOVING INTO NORTHWEST AND WEST CENTRAL UTAH THE NEXT SEVERAL HOURS AND COULD CAUSE STRONG GUSTY WINDS...LOCALLY HEAVY RAIN AND DANGEROUS LIGHTNING. WHILE THE MAIN ACTIVITY TONIGHT WILL LIKELY BE IN NORTHWEST AND WEST CENTRAL UTAH...THE POTENTIAL EXISTS FOR ALMOST ANY AREA OF THE STATE TO HAVE THUNDERSTORMS DEVELOP. RESIDENTS OF UTAH SHOULD MAINTAIN A HIGH AWARENESS OF THE WEATHER SITUATION TONIGHT. REMEMBER...IF YOU ARE CAUGHT OUTSIDE IN A THUNDERSTORM...DO NOT STAND UNDERNEATH A TALL ISOLATED TREE OR A TELEPHONE POLE. ALSO RAIN FROM STRONG THUNDERSTORMS CAN FLOOD ROADS QUICKLY. DO NOT ATTEMPT TO DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. ADDITIONAL STATEMENTS OR ADVISORIES WILL BE ISSUED AS NEEDED. ERC...2338Z
Special weather statement, Aug 1, 8:25 PM MDT, 2 hours 15 minutes before
UTZALL-020500-
SPECIAL WEATHER STATEMENT AND UTAH WEATHER SUMMARY
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
820 PM MDT THU AUG 1 1991
...THUNDERSHOWERS CONTINUING OVER PORTIONS OF UTAH...
A VERY MOIST AND UNSTABLE AIRMASS CONTINUES OVER MUCH OF UTAH.
AT 8 PM SATELLITE IMAGERY INDICATED THE MAIN THUNDERSTORM ACTIVITY
WAS OVER WEST CENTRAL UTAH. AT 730 PM A FLASH FLOOD SPOTTER IN DELTA
REPORTED .50 INCHES OF RAIN IN 25 MINUTES. STRONG THUNDERSTORMS WERE
ALSO LOCATED JUST EAST OF THE FOUR-CORNERS AREA AND JUST SOUTH OF THE
SOUTHERN END OF LAKE POWELL. NONE OF THESE THUNDERSTORMS WERE SHOWING
MUCH MOVEMENT.
ACTIVITY IN NORTHWEST UTAH HAD BECOME MINIMAL AS THE FLOW ALOFT HAS
TURNED TO THE NORTHWEST WITH MUCH DRIER AND MORE STABLE AIR MOVING
INTO THE AREA. SCATTERED THUNDERSTORMS ARE EXPECTED TO CONTINUE
OVER THE STATE BEFORE DIMINISHING AROUND MIDNIGHT.
EXCEPT FOR EXTREME NORTHWEST UTAH...ALMOST ANY PART OF THE STATE
COULD SEE SOME THUNDERSTORM DEVELOPMENT UNTIL ABOUT MIDNIGHT.
DUE TO THE VERY MOIST AND UNSTABLE AIRMASS OVER MOST OF THE STATE...
LOCALLY HEAVY RAIN...GUSTY WINDS...AND DANGEROUS LIGHTNING WILL
ACCOMPANY MANY OF THE THUNDERSTORMS.
REMEMBER...LIGHTNING IS A PROVEN KILLER...DO NOT BECOME A HUMAN
LIGHTNING ROD...KEEP AWAY FROM OPEN WATER...TRACTORS AND OTHER FARM
EQUIPMENT.
ADDITIONAL STATEMENTS OR ADVISORIES WILL BE ISSUED AS NEEDED.
ERC...0222ZThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 4:40 PM MDT | Flash Flood Warning | SLC | Grand, Uintah | 2 hr |
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.