Alert archive / Utah / Flash Flood Warnings in 2012

Flash Flood Warning 57, NWS Salt Lake City, UT

August 23, 2012Sevier County, Wayne County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 23, 2012, 11:59 AM MDT for Sevier County, Wayne County, Utah. It was in force for 3 hr. 1 report 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 23, 2012, 11:59 AM MDT (17:59 UTC)
Expired
Aug 23, 2012, 3:00 PM MDT
In force
3 hr
Issued by
NWS Salt Lake City, UT
Area
Storm-based polygon
Flood severity
None

Counties Sevier County, UT, Wayne County, UT

The radar

The Cedar City radar (KICX), 162 km from the middle of the area, began a volume at 18:01 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

TimeReportWhereRemark
Aug 23, 12:54 PM MDTFLASH FLOODSe Torrey, UTFLASH FLOODING IN CAPITOL REEF NP INCLUDING SULPHUR CREEK.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 6.0 hours before the alert went out and 256 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.

Skew-T log-pSkew-T log-p diagram, Grand Junction, CO at 12:00Z on 2012-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 191 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Grand Junction, CO at 12:00Z on 2012-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
191 J/kg
Mixed-layer CIN
-77 J/kg
Mixed-layer LCL
1007 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
132 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

919 
WGUS55 KSLC 231759
FFWSLC
UTC041-055-232100-
/O.NEW.KSLC.FF.W.0057.120823T1759Z-120823T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1159 AM MDT THU AUG 23 2012

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN SEVIER COUNTY IN UTAH
  WESTERN WAYNE COUNTY IN UTAH

* UNTIL 300 PM MDT

* AT 1151 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR 
INDICATED   THUNDERSTORMS CAPABLE OF PRODUCING VERY HEAVY RAIN OVER 
CAPITOL REEF NATIONAL PARK.

* THIS WARNING INCLUDES THE CATHEDRAL VALLEY...SULPHUR 
CREEK...CAPITOL GORGE...GRAND WASH...THE SCENIC DRIVE...CAPITOL 
GORGE.

SPOTTER REPORTS OF HEAVY RAINFALL...IN EXCESS OF 0.60 INCHES IN A 
SHORT PERIOD HAVE BEEN RECEIVED. SPOTTERS HAVE ALSO REPORTED WATER 
CROSSING THE SCENIC ROAD SOUTH OF FRUITA. HEAVY RUNOFF AND FLASH 
FLOODING CAN BE EXPECTED OVER THE NEXT SEVERAL HOURS ACROSS THE 
WARNED AREA. 

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 3820 11110 3818 11123 3831 11147 3841 11147
      3855 11139 3846 11115

$$

KRUSE
2 follow-up statements
092 
WGUS75 KSLC 231908
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
108 PM MDT THU AUG 23 2012

UTC041-055-232100-
/O.CON.KSLC.FF.W.0057.000000T0000Z-120823T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-SEVIER UT-
108 PM MDT THU AUG 23 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 300 PM MDT FOR
SOUTHEASTERN SEVIER AND WESTERN WAYNE COUNTIES...

AT 100 PM MDT...FLASH FLOODING WAS REPORTED IN THE SULPHER CREEK 
DRAINAGE OF CAPITOL REEF NATIONAL PARK. SULPHER CREEK IS LOCATED TO 
THE WEST OF THE PARK AND FLOWS DIRECTLY EAST PAST THE VISITORS 
CENTER TERMINATING INTO THE FREMONT RIVER.

IF YOU PLAN ON TRAVELING THROUGH CAPITOL REEF NATIONAL PARK...PLEASE 
USE CAUTION...AS IT IS ANTICIPATED FLASH FLOODING MAY OCCUR IN MANY 
OTHER LOCATIONS IN THE 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 3820 11110 3818 11123 3831 11147 3841 11147
      3855 11139 3846 11115

$$

MCINERNEY
702 
WGUS75 KSLC 232055
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
255 PM MDT THU AUG 23 2012

UTC041-055-232103-
/O.EXP.KSLC.FF.W.0057.000000T0000Z-120823T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-SEVIER UT-
255 PM MDT THU AUG 23 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 300 PM MDT FOR SOUTHEASTERN
SEVIER AND WESTERN WAYNE COUNTIES...

FLASH FLOODING WAS REPORTED IN THE SULPHER CREEK DRAINAGE OF CAPITOL 
REEF NATIONAL PARK.  IT IS ANTICIPATED THAT OTHER DRAINAGES IN THE 
NORTHERN END OF THE PARK WILL CONTINUE TO FLOW AT ELEVATED LEVELS 
THROUGHOUT THE EVENING AND NIGHTTIME HOURS.

PLEASE BE VIGILANT IF YOU ARE TRAVELING THROUGH THESE AREAS THIS 
EVENING.

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 3820 11110 3818 11123 3831 11147 3841 11147
      3855 11139 3846 11115

$$

MCINERNEY

The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 23, 12:45 PM MDTFlash Flood WarningSLCGarfield, Wayne3 hr
Aug 23, 2:52 PM MDTFlash Flood WarningSLCKane, San Juan6 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.