Alert archive / Utah / Flash Flood Warnings in 2011
Flash Flood Warning 4, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 8, 2011, 3:41 PM MDT for Garfield County, Kane 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
- Jul 8, 2011, 3:41 PM MDT (21:41 UTC)
- Expired
- Jul 8, 2011, 6:45 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Flood severity
- None
Counties Garfield County, UT, Kane County, UT
The radar
The Cedar City radar (KICX), 104 km from the middle of the area, began a volume at 21:42 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
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 9.7 hours before the alert went out and 222 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
- 423 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 1308 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
553
WGUS55 KSLC 082141
FFWSLC
UTC017-025-090045-
/O.NEW.KSLC.FF.W.0004.110708T2141Z-110709T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
341 PM MDT FRI JUL 8 2011
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTH CENTRAL GARFIELD COUNTY IN UTAH...
CENTRAL KANE COUNTY IN UTAH...
* UNTIL 645 PM MDT
* AT 330 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
RAINFALL AMOUNTS OF 1.5 INCHES IN A SHORT PERIOD OF TIME OVER
WAHWEEP DRAINAGE. AS SUCH...FLASH FLOODING IS VERY LIKELY IN
THIS WASH THROUGH THE EVENING HOURS. THIS AREA FLOWS PAST BIG
WATER UTAH AND THEN TERMINATES INTO LAKE POWELL.
* THE STORM PRODUCING FLASH FLOODING WILL OTHERWISE REMAIN OVER
MAINLY RURAL AREAS OF THE INDICATED COUNTIES.
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 3715 11187 3730 11191 3744 11188 3761 11179
3736 11167 3711 11159 3704 11160 3703 11172
3707 11182
$$
MCINERNEY2 follow-up statements
164
WGUS75 KSLC 082259
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
459 PM MDT FRI JUL 8 2011
UTC017-025-090045-
/O.CON.KSLC.FF.W.0004.000000T0000Z-110709T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-GARFIELD UT-
459 PM MDT FRI JUL 8 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM MDT FOR THE
WAHWEEP DRAINAGE AS IT FLOWS INTO LAKE POWELL...
AT 437 PM MDT...REPORTS FROM THE GSENM VISITOR CENTER IN BIG WATER
UTAH INDICATED EXTENSIVE FLASH FLOODING IN THE WAHWEEP DRAINAGE.
THUNDERSTORMS OVER THE LOWER WAHWEEP WATERSHED PRODUCED RAINFALL
AMOUNTS OF 1.5 INCHES IN A SHORT PERIOD OF TIME. THE RAINFALL
OCCURRED AROUND 3PM AND HAS SINCE MOVED ON. IT IS ANTICIPATED THAT
THE FLOODING...WHILE QUITE LARGE...WILL DECLINE THROUGH THE EVENING
HOURS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 3715 11187 3730 11191 3744 11188 3761 11179
3736 11167 3711 11159 3704 11160 3703 11172
3707 11182
$$
MCINERNEY443
WGUS75 KSLC 090042
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
642 PM MDT FRI JUL 8 2011
UTC017-025-090046-
/O.EXP.KSLC.FF.W.0004.000000T0000Z-110709T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-GARFIELD UT-
642 PM MDT FRI JUL 8 2011
...THE FLASH FLOOD WARNING WILL EXPIRE AT 645 PM MDT FOR SOUTH
CENTRAL GARFIELD AND CENTRAL KANE COUNTIES...
HEAVY PRECIPITATION HAS DECREASED ALONG WAHWEAP CREEK THIS EVENING.
RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED...AND RIVER AND
STREAM LEVELS WILL CONTINUE TO LOWER. THEREFORE...THE FLASH FLOOD
WARNING HAS BEEN ALLOWED TO EXPIRE.
LAT...LON 3715 11187 3730 11191 3744 11188 3761 11179
3736 11167 3711 11159 3704 11160 3703 11172
3707 11182
$$
LCThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 6:20 PM MDT | Special Weather Statement | SLC | Wasatch | 40 min |
| Jul 7, 6:25 PM MDT | Special Weather Statement | SLC | Tooele | 65 min |
| Jul 7, 6:49 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder, Juab, Tooele | 41 min |
| Jul 7, 7:31 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder, Juab, Tooele | 29 min |
| Jul 8, 4:54 PM MDT | Special Weather Statement | SLC | Cache | 51 min |
Nearby
Flash Flood Warnings in Utah, 2011Every flash flood warning in 2011
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.