Alert archive / Utah / Flash Flood Warnings in 2012
Flash Flood Warning 66, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Sep 11, 2012, 1:45 PM MDT for Washington County, Utah. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 11, 2012, 1:45 PM MDT (19:45 UTC)
- Expired
- Sep 11, 2012, 4:45 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Flood severity
- None
County Washington County, UT
The radar
The Cedar City radar (KICX), 87 km from the middle of the area, began a volume at 19:48 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Las Vegas, NV (KVEF), launched 12:00Z, 7.8 hours before the alert went out and 188 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
- 2 J/kg
- Mixed-layer CIN
- -171 J/kg
- Mixed-layer LCL
- 1725 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
781 WGUS55 KSLC 111945 FFWSLC UTC053-112245- /O.NEW.KSLC.FF.W.0066.120911T1945Z-120911T2245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SALT LAKE CITY UT 145 PM MDT TUE SEP 11 2012 THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTH CENTRAL WASHINGTON COUNTY IN UTAH * UNTIL 445 PM MDT * AT 135 PM MDT...LOCAL LAW ENFORCEMENT REPORTED THAT THE LAUB DIKE IN SANTA CLARA HAS FAILED AND FLOODING WAS REPORTED IN PORTIONS OF THE COMMUNITY. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SANTA CLARA PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. TURN AROUND AND DONT DROWN. && LAT...LON 3714 11367 3715 11363 3707 11359 3711 11367 $$ PW
2 follow-up statements
191 WGUS75 KSLC 112038 FFSSLC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 238 PM MDT TUE SEP 11 2012 UTC053-112245- /O.CON.KSLC.FF.W.0066.000000T0000Z-120911T2245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WASHINGTON UT- 238 PM MDT TUE SEP 11 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM MDT FOR SOUTH CENTRAL WASHINGTON COUNTY... AT 223 PM MDT...FLOODING FROM THE RETENTION POND BEHIND LAUB DIKE IN SANTA CLARA IS BEGINNING TO ABATE. THE POND IS NOW EMPTY AND THE WATER HAS MOVED DOWNSTREAM TOWARDS THE SANTA CLARA RIVER. FLOODING WAS REPORTED SOUTH OF SNOW CANYON HIGH SCHOOL. THE SANTA CLARA RIVER WILL CONTINUE TO RUN AT VERY HIGH LEVELS THROUGH AT LEAST 400 PM DOWNSTREAM FROM SANTA CLARA TO WHERE IT JOINS THE VIRGIN RIVER NEAR BLOOMINGTON. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SANTA CLARA PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. TURN AROUND AND DONT DROWN. && LAT...LON 3714 11367 3715 11363 3707 11359 3711 11367 $$ PW
142 WGUS75 KSLC 112241 FFSSLC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 441 PM MDT TUE SEP 11 2012 UTC053-112251- /O.EXP.KSLC.FF.W.0066.000000T0000Z-120911T2245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WASHINGTON UT- 441 PM MDT TUE SEP 11 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 445 PM MDT FOR SOUTH CENTRAL WASHINGTON COUNTY... FLOODING IN SANTA CLARA HAS ENDED AND THE FLASH FLOOD WARNING IS BEING ALLOWED TO EXPIRE. LAT...LON 3714 11367 3715 11363 3707 11359 3711 11367 $$ PW
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 10, 6:08 PM MDT | Special Weather Statement | SLC | Tooele | 22 min |
| Sep 11, 10:52 AM MDT | Areal Flood Warning | SLC | Washington | 8 hr |
| Sep 11, 12:20 PM MDT | Areal Flood Warning | SLC | Kane | 4 hr |
| Sep 11, 12:27 PM MDT | Flash Flood Warning | SLC | Wayne | 4 hr |
| Sep 11, 4:20 PM MDT | Flash Flood Warning | SLC | Wayne | 3 hr |
Nearby
Flash Flood Warnings in Utah, 2012Every flash flood warning in 2012
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; radar from the NEXRAD Level II archive.