Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 23, NWS Salt Lake City, UT

August 3, 2011Garfield County, Wayne County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 3, 2011, 3:15 PM MDT for Garfield 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 3, 2011, 3:15 PM MDT (21:15 UTC)
Expired: Aug 3, 2011, 6:15 PM MDT
In force: 3 hr
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Flood severity: None

Counties Garfield County, UT, Wayne County, UT

The radar

The Cedar City radar (KICX), 155 km from the middle of the area, began a volume at 21:15 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 3, 5:02 PM MDT	FLASH FLOOD	3 E Torrey, UT	SULPHER CREEK IN CAPITOL REEF NATIONAL PARK FLASH FLOOD.

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, 9.3 hours before the alert went out and 262 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 79 J/kg
Mixed-layer CIN: -267 J/kg
Mixed-layer LCL: 1699 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 55 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.

612 
WGUS55 KSLC 032115
FFWSLC
UTC017-055-040015-
/O.NEW.KSLC.FF.W.0023.110803T2115Z-110804T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
315 PM MDT WED AUG 3 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL GARFIELD COUNTY IN UTAH...
  SOUTH CENTRAL WAYNE COUNTY IN UTAH...
  THIS INCLUDES THE CITY OF CAPITOL REEF NATIONAL PARK...

* UNTIL 615 PM MDT

* AT 312 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN FROM THUNDERSTORMS OVER CAPITOL REEF NATIONAL           
  PARK. FLOODING IS OCCURRING IN SULPHER CREEK AND MOST LIKELY       
  TO DRAINAGES IN THE CENTRAL SECTION OF 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 3831 11140 3833 11133 3833 11117 3835 11103
      3819 11103 3806 11105 3805 11139 3810 11146
      3819 11149 3828 11144

$$

MCINERNEY

3 follow-up statements

064 
WGUS55 KSLC 032119 CCA
FFWSLC
UTC017-055-040015-
/O.COR.KSLC.FF.W.0023.110803T2115Z-110804T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
315 PM MDT WED AUG 3 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL GARFIELD COUNTY IN UTAH...
  SOUTH CENTRAL WAYNE COUNTY IN UTAH...
  THIS INCLUDES CAPITOL REEF NATIONAL PARK...

* UNTIL 615 PM MDT

* AT 312 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN FROM THUNDERSTORMS OVER CAPITOL REEF NATIONAL           
  PARK. FLOODING IS OCCURRING IN SULPHER CREEK AND MOST LIKELY       
  TO DRAINAGES IN THE CENTRAL SECTION OF 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 3831 11140 3833 11133 3833 11117 3835 11103
      3819 11103 3806 11105 3805 11139 3810 11146
      3819 11149 3828 11144

$$

MCINERNEY

229 
WGUS75 KSLC 032244
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
444 PM MDT WED AUG 3 2011

UTC017-055-040015-
/O.CON.KSLC.FF.W.0023.000000T0000Z-110804T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-WAYNE UT-
444 PM MDT WED AUG 3 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM MDT FOR SOUTH
CENTRAL WAYNE AND NORTH CENTRAL GARFIELD COUNTIES...

AT 429 PM MDT...PARK RANGERS IN CAPITOL REEF NATIONAL PARK HAVE 
REPORTED THAT A LARGE FLASH FLOOD IS CURRENTLY MOVING THROUGH THE 
SULPHER CREEK DRAINAGE AND INTO THE FREMONT RIVER.  BOTH OF THESE 
WATERWAYS FLOW THROUGH 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 3831 11140 3833 11133 3833 11117 3835 11103
      3819 11103 3806 11105 3805 11139 3810 11146
      3819 11149 3828 11144

$$

MCINERNEY

089 
WGUS75 KSLC 040010
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
610 PM MDT WED AUG 3 2011

UTC017-055-040018-
/O.EXP.KSLC.FF.W.0023.000000T0000Z-110804T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-WAYNE UT-
610 PM MDT WED AUG 3 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 615 PM MDT FOR SOUTH
CENTRAL WAYNE AND NORTH CENTRAL GARFIELD COUNTIES...

AS THUNDERSTORM IN THE AREA HAS DIMINISHED FOR SOME TIME...IT IS 
INFERRED THAT THE FLASH FLOODING IN THE AREA HAS ATTENUATED.  
HOWEVER... HIGH FLOWS WILL REMAIN IN THE AREA THROUGHOUT THE EVENING 
HOURS.

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 3831 11140 3833 11133 3833 11117 3835 11103
      3819 11103 3806 11105 3805 11139 3810 11146
      3819 11149 3828 11144

$$

MCINERNEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 6:09 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder, Tooele	51 min
Aug 2, 8:00 PM MDT	Special Weather Statement	SLC	Morgan	30 min
Aug 3, 3:44 PM MDT	Flash Flood Warning	SLC	Kane	3 hr

Nearby

Flash Flood Warnings in Utah, 2011 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.