Alert archive / Utah / Flash Flood Warnings in 2012
Flash Flood Warning 39, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 1, 2012, 5:17 PM MDT for Washington County, Utah. It was in force for 4 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
- Aug 1, 2012, 5:17 PM MDT (23:17 UTC)
- Expired
- Aug 1, 2012, 9:15 PM MDT
- In force
- 4 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), 40 km from the middle of the area, began a volume at 23:17 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, 11.3 hours before the alert went out and 235 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
- 461 J/kg
- Mixed-layer CIN
- -123 J/kg
- Mixed-layer LCL
- 1110 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
006
WGUS55 KSLC 012317
FFWSLC
UTC053-020315-
/O.NEW.KSLC.FF.W.0039.120801T2317Z-120802T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
517 PM MDT WED AUG 1 2012
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
* FLASH FLOOD WARNING FOR...
LA VERKIN CREEK FROM THE HEADWATERS IN ZION NATIONAL PARK TO ITS
TERMINUS AT THE VIRGIN RIVER IN TOQUERVILLE
* UNTIL 915 PM MDT
* AT 508 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
HEAVY RAIN FROM A THUNDERSTORM OVER THE WARNED AREA. RAINFALL
ESTIMATES OF .50 TO 1.00 INCHES HAS FALLEN OVER THE LAST 30
MINUTES...AND AN ADDITIONAL .50 TO .75 INCHES OF RAIN IS EXPECTED
TO FALL OVER PORTIONS OF THE UPPER CREEK WITHIN THE NEXT 30
MINUTES. THIS RAINFALL IS EXPECTED TO CREATE A FLASH FLOOD DOWN
THE CREEK TO ITS TERMINUS AT THE VIRGIN RIVER IN TOQUERVILLE.
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.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.
&&
LAT...LON 3728 11327 3730 11328 3743 11321 3749 11310
3748 11308 3744 11307 3738 11311 3733 11321
3719 11325 3719 11331
$$
MERRILL2 follow-up statements
501
WGUS75 KSLC 020123
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
723 PM MDT WED AUG 1 2012
UTC053-020315-
/O.CON.KSLC.FF.W.0039.000000T0000Z-120802T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
723 PM MDT WED AUG 1 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MDT FOR LA
VERKIN CREEK FROM THE HEADWATERS TO ITS TERMINUS IN THE VIRGIN RIVER
IN TOQUERVILLE...
AT 712 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATES OF
.50 TO 1.25 INCHES OF RAINFALL OCCURRED OVER THE UPPER REACHES OF LA
VERKIN CREEK FROM EARLIER THUNDERSTORMS. THIS RAINFALL IS EXPECTED
TO CREATE A FLASH FLOOD ALONG LA VERKIN CREEK FROM ZION NATIONAL
PARK TO ITS TERMINUS AT THE VIRGIN RIVER IN TOQUERVILLE THROUGH 915
PM MDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 3728 11327 3730 11328 3743 11321 3749 11310
3748 11308 3744 11307 3738 11311 3733 11321
3719 11325 3719 11331
$$
MERRILL405
WGUS75 KSLC 020310
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
910 PM MDT WED AUG 1 2012
UTC053-020316-
/O.EXP.KSLC.FF.W.0039.000000T0000Z-120802T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
910 PM MDT WED AUG 1 2012
...THE FLASH FLOOD WARNING WILL EXPIRE AT 915 PM MDT FOR EAST CENTRAL
WASHINGTON COUNTY...
PRECIPITATION HAS TAPERED OFF OVER LA VERKIN CREEK. THEREFORE... THE
FLASH FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE. ALTHOUGH WATER
LEVELS MAY REMAIN HIGH ALONG PORTIONS OF LA VERKIN CREEK FROM ZION
NATIONAL PARK TO ITS TERMINUS AT THE VIRGIN RIVER IN
TOQUERVILLE...THEY WILL GRADUALLY RECEDE THROUGH THE REST OF THIS
EVENING. MONITOR NOAA WEATHER RADIO OR LOCAL TELEVISION OR RADIO FOR
THE LATEST WEATHER INFORMATION.
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.
LAT...LON 3728 11327 3730 11328 3743 11321 3749 11310
3748 11308 3744 11307 3738 11311 3733 11321
3719 11325 3719 11331
$$
LCThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 6:30 PM MDT | Flash Flood Warning | SLC | Iron | 4 hr |
| Jul 31, 6:30 PM MDT | Special Weather Statement | SLC | Kane | 30 min |
| Jul 31, 10:51 PM MDT | Flash Flood Warning | SLC | Washington | 4 hr |
| Aug 1, 2:30 AM MDT | Flash Flood Watch | SLC | 20 hr | |
| Aug 1, 2:51 PM MDT | Flash Flood Warning | SLC | Garfield | 4 hr |
| Aug 1, 3:09 PM MDT | Flash Flood Warning | SLC | Garfield, Kane | 6 hr |
| Aug 1, 4:05 PM MDT | Flash Flood Warning | SLC | Kane | 4 hr |
| Aug 1, 5:23 PM MDT | Flash Flood Warning | SLC | Kane, Washington | 4 hr |
| Aug 1, 5:27 PM MDT | Flash Flood Warning | SLC | Carbon, Emery | 4 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.