Alert archive / Utah / Flash Flood Warnings in 2012
Flash Flood Warning 53, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 19, 2012, 5:38 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 19, 2012, 5:38 PM MDT (23:38 UTC)
- Expired
- Aug 19, 2012, 9:30 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), 71 km from the middle of the area, began a volume at 23:40 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, 11.6 hours before the alert went out and 203 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
- 75 J/kg
- Mixed-layer CIN
- -233 J/kg
- Mixed-layer LCL
- 2531 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
123
WGUS55 KSLC 192338
FFWSLC
UTC053-200330-
/O.NEW.KSLC.FF.W.0053.120819T2338Z-120820T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
538 PM MDT SUN AUG 19 2012
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL WASHINGTON COUNTY IN UTAH...INCLUDING
LEEDS...WASHINGTON...AND SNOW CANYON STATE PARK
* UNTIL 930 PM MDT
* AT 527 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
TORRENTIAL RAINFALL FROM THUNDERSTORMS MOVING ACROSS THE SOUTHERN
SLOPES OF THE PINE VALLEY MOUNTAINS. RADAR ESTIMATED 3 TO 4 INCHES
HAS FALLEN ACROSS THIS AREA. ADDITIONAL THUNDERSTORMS PRODUCING
TORRENTIAL RAINFALL WILL CONTINUE THROUGH AT LEAST 6 PM.
* FLASH FLOODING IS EXPECTED IN AND AROUND LEEDS...QUAIL CREEK...AND
THE RED CLIFFS AREA...WITH ADDITIONAL THUNDERSTORMS EXPECTED TO
PRODUCE FLASH FLOODING IN AND AROUND THE SNOW CANYON AREA. RUNOFF
FROM THIS TORRENTIAL RAINFALL IS EXPECTED TO MAKE ITS WAY TOWARD
WASHINGTON BY EARLY EVENING.
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 3721 11367 3730 11370 3733 11350 3732 11330
3720 11334 3718 11338 3712 11349 3713 11362
$$
MPS2 follow-up statements
546
WGUS75 KSLC 200147
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
747 PM MDT SUN AUG 19 2012
UTC053-200330-
/O.CON.KSLC.FF.W.0053.000000T0000Z-120820T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
747 PM MDT SUN AUG 19 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM MDT FOR
CENTRAL WASHINGTON COUNTY...
AT 737 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
UPWARDS OF 5 INCHES OF RAIN HAD FALLEN ACROSS THE SOUTHERN SLOPES OF
THE PINE VALLEY MOUNTAINS SINCE APPROXIMATELY 4 PM. ALTHOUGH
RAINFALL HAS TAPERED OFF...THIS RUNOFF IS LIKELY PRODUCING FLASH
FLOODING ALONG SMALL STREAMS AND CREEKS ALONG THE SOUTH SLOPES OF
THE PINE VALLEYS...LEADING TOWARD LEEDS...WASHINGTON...AND SNOW
CANYON STATE PARK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 3721 11367 3730 11370 3733 11350 3732 11330
3720 11334 3718 11338 3712 11349 3713 11362
$$
MPS230
WGUS75 KSLC 200323
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
923 PM MDT SUN AUG 19 2012
UTC053-200333-
/O.EXP.KSLC.FF.W.0053.000000T0000Z-120820T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
923 PM MDT SUN AUG 19 2012
...THE FLASH FLOOD WARNING WILL EXPIRE AT 930 PM MDT FOR CENTRAL
WASHINGTON COUNTY...
RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED GREATLY AND RIVER
AND STREAM LEVELS HAVE DECREASED. THEREFORE... THE FLASH FLOOD
WARNING HAS BEEN ALLOWED TO EXPIRE. 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 3721 11367 3730 11370 3733 11350 3732 11330
3720 11334 3718 11338 3712 11349 3713 11362
$$
DUNNThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 2:53 AM MDT | Flash Flood Watch | SLC | 19 hr | |
| Aug 19, 2:41 PM MDT | Flash Flood Warning | SLC | Kane | 9 hr |
| Aug 19, 3:52 PM MDT | Flash Flood Warning | SLC | Kane | 4 hr |
| Aug 19, 4:29 PM MDT | Flash Flood Warning | SLC | Washington | 3 hr |
| Aug 19, 4:39 PM MDT | Flash Flood Warning | SLC | Garfield | 3 hr |
| Aug 19, 4:59 PM MDT | Flash Flood Warning | SLC | Kane, Washington | 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.