Alert archive / Utah / Flash Flood Warnings in 2012
Flash Flood Warning 35, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 31, 2012, 10:51 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
- Jul 31, 2012, 10:51 PM MDT (04:51 UTC)
- Expired
- Aug 1, 2012, 2:45 AM 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), 39 km from the middle of the area, began a volume at 04:51 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 00:00Z, 4.9 hours before the alert went out and 236 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
- 646 J/kg
- Mixed-layer CIN
- -52 J/kg
- Mixed-layer LCL
- 1370 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
012
WGUS55 KSLC 010451
FFWSLC
UTC053-010845-
/O.NEW.KSLC.FF.W.0035.120801T0451Z-120801T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1051 PM MDT TUE JUL 31 2012
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
* FLASH FLOOD WARNING FOR...
LA VERKIN CREEK IN EAST CENTRAL WASHINGTON COUNTY IN UTAH
* UNTIL 245 AM MDT
* AT 1043 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS PRODUCING VERY HEAVY RAIN OVER THE HEADWATERS OF LA
VERKIN CREEK IN THE KOLOB CANYONS SECTION OF ZION NATIONAL PARK.
RADAR ESTIMATES ARE NEARING OVER 1 INCH OF RAIN IN THE PAST HOURS.
THUNDERSTORMS CONTINUE TO DEVELOP IN THIS AREA.
* FLASH FLOODING IS EXPECTED ALONG THE LA VERKIN CREEK DRAINAGE AREA
AND OTHER DRAINAGES WITHIN THE WARNED AREA. FLASH FLOODING FROM THIS
AREA IS EXPECTED TO REACH THE TERMINATION OF LA VERKIN CREEK AT THE
VIRGIN RIVER LATER TONIGHT. THIS WARNING INCLUDES AREAS IN THE TOWN
LA VERKIN NEAR LA VERKIN CREEK.
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.
FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.
&&
LAT...LON 3748 11320 3745 11305 3732 11316 3720 11322
3720 11330
$$
KRUSE2 follow-up statements
650
WGUS75 KSLC 010706
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
106 AM MDT WED AUG 1 2012
UTC053-010845-
/O.CON.KSLC.FF.W.0035.000000T0000Z-120801T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
106 AM MDT WED AUG 1 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM MDT FOR THE
LA VERKIN CREEK DRAINAGE IN EAST CENTRAL WASHINGTON COUNTY...
HEAVY RAINFALL HAS LARGELY ENDED OVER THE LA VERKIN
DRAINAGE...HOWEVER RUNOFF AND RESULTING FLASH FLOODING WILL CONTINUE
DOWN THE DRAINAGE OVER THE NEXT SEVERAL HOURS. THIS WARNING REMAINS
IN EFFECT THROUGH THE TERMINATION OF LA VERKIN CREEK AT THE VIRGIN
RIVER INCLUDING SUSCEPTIBLE AREAS IN LA VERKIN NEAR THE CREEK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 3748 11320 3745 11305 3732 11316 3720 11322
3720 11330
$$
KRUSE168
WGUS75 KSLC 010836
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
236 AM MDT WED AUG 1 2012
UTC053-010846-
/O.EXP.KSLC.FF.W.0035.000000T0000Z-120801T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
236 AM MDT WED AUG 1 2012
...THE FLASH FLOOD WARNING WILL EXPIRE AT 245 AM MDT FOR EAST CENTRAL
WASHINGTON COUNTY...
RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED GREATLY AND RIVER
AND STREAM LEVELS HAVE DECREASED. THEREFORE...THE FLASH FLOOD
WARNING WILL BE 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 3748 11320 3745 11305 3732 11316 3720 11322
3720 11330
$$
MPSThe 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 |
| 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, 5:17 PM MDT | Flash Flood Warning | SLC | Washington | 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.