Alert archive / Utah / Flash Flood Warnings in 2012
Flash Flood Warning 52, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 19, 2012, 4:59 PM MDT for Kane County, Washington County, Utah. It was in force for 4 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 19, 2012, 4:59 PM MDT (22:59 UTC)
- Expired
- Aug 19, 2012, 9:00 PM MDT
- In force
- 4 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Flood severity
- None
Counties Kane County, UT, Washington County, UT
The radar
The Cedar City radar (KICX), 38 km from the middle of the area, began a volume at 23:01 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 19, 6:00 PM MDT | FLASH FLOOD | Zion Np, UT | SIGNIFICANT FLASH FLOODING IN KEYHOLE AND PINE CREEK CANYONS. |
| Aug 19, 6:20 PM MDT | FLASH FLOOD | Zion Np, UT | SIGNIFICANT FLASH FLOODING ALONG NORTH CREEK INCLUDING THE SUBWAY. FLASH FLOODING ALSO REPORTED IN SPRY CANYON AND ALONG THE NORTH FORK OF THE VIRGIN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 11.0 hours before the alert went out and 248 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
- 155 J/kg
- Mixed-layer CIN
- -108 J/kg
- Mixed-layer LCL
- 1712 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -30 m²/s²
- 0-3 km storm-relative helicity
- -32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
250
WGUS55 KSLC 192259
FFWSLC
UTC025-053-200300-
/O.NEW.KSLC.FF.W.0052.120819T2259Z-120820T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
459 PM MDT SUN AUG 19 2012
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
* FLASH FLOOD WARNING FOR...
WEST CENTRAL KANE COUNTY IN UTAH
EAST CENTRAL WASHINGTON COUNTY IN UTAH...INCLUDING MUCH OF
ZION NATIONAL PARK
* UNTIL 900 PM MDT
* AT 448 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS PRODUCING VERY HEAVY RAINFALL ACROSS ZION CANYON
INCLUDING THE NARROWS. ADDITIONAL THUNDERSTORMS WERE DEVELOPING
ACROSS SOUTHWESTERN PORTIONS OF THE PARK...AS WELL AS EASTWARD
ALONG HIGHWAY 9 EAST OF THE EAST ENTRANCE. THIS HEAVY RAINFALL
WILL LIKELY CONTINUE THROUGH AT LEAST 6 PM.
* AREAS WITHIN THE WARNING INCLUDE THE NARROWS...PINE CREEK...SPRY
CANYON...ZION CANYON...AND OTHER DRAINAGES ACROSS AND EAST OF
ZION NATIONAL 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 3725 11312 3725 11300 3737 11298 3737 11267
3713 11270 3716 11309
$$
MPS2 follow-up statements
754
WGUS75 KSLC 200015
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
615 PM MDT SUN AUG 19 2012
UTC025-053-200300-
/O.CON.KSLC.FF.W.0052.000000T0000Z-120820T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-KANE UT-
615 PM MDT SUN AUG 19 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 PM MDT FOR WEST
CENTRAL KANE AND EAST CENTRAL WASHINGTON COUNTIES...INCLUDING MUCH
OF ZION NATIONAL PARK...
AT 610 PM MDT...RANGERS AT ZION NATIONAL PARK REPORTED SIGNIFICANT
FLASH FLOODING IN KEYHOLE AND PINE CREEK CANYONS. THIS FLASH
FLOODING IS RESULTING FROM TORRENTIAL RAINFALL WHICH HAS FALLEN
ACROSS THE PARK...WITH RADAR ESTIMATES IN EXCESS OF 1 INCH ACROSS
ZION CANYON SINCE 430 PM.
FLASH FLOODING WILL CONTINUE THROUGH KEYHOLE AND PINE CREEK
CANYONS...AS WELL AS OTHER CANYONS ACROSS CENTRAL PORTIONS OF THE
PARK. SIGNIFICANT FLASH FLOODING IS ALSO LIKELY OCCURRING ALONG
NORTH CREEK INCLUDING THE SUBWAY AT THIS TIME.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 3725 11312 3725 11300 3737 11298 3737 11267
3713 11270 3716 11309
$$
MPS932
WGUS75 KSLC 200255
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
855 PM MDT SUN AUG 19 2012
UTC025-053-200303-
/O.EXP.KSLC.FF.W.0052.000000T0000Z-120820T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-KANE UT-
855 PM MDT SUN AUG 19 2012
...THE FLASH FLOOD WARNING WILL EXPIRE AT 900 PM MDT FOR WEST CENTRAL
KANE AND EAST CENTRAL WASHINGTON COUNTIES...
RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED AND RIVER AND
STREAM LEVELS HAVE DECREASED. FLOWS ON THE NORTH FORK OF THE VIRGIN
RIVER IN ZION NATIONAL PARK PEAKED AT OVER 1000 CFS BUT HAVE BEEN
FALLING FOR THE PAST 2 HOURS. 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 3725 11312 3725 11300 3737 11298 3737 11267
3713 11270 3716 11309
$$
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, 5:38 PM MDT | Flash Flood Warning | SLC | 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.