Alert archive / Utah / Flash Flood Warnings in 2012

Flash Flood Warning 31, NWS Salt Lake City, UT

July 31, 2012Carbon County, Emery County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 31, 2012, 1:55 PM MDT for Carbon County, Emery 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, 1:55 PM MDT (19:55 UTC)
Expired: Jul 31, 2012, 6:04 PM MDT
In force: 4 hr
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Flood severity: None

Counties Carbon County, UT, Emery County, UT

The radar

The Salt Lake City radar (KMTX), 225 km from the middle of the area, began a volume at 19:56 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 7.9 hours before the alert went out and 156 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: 32 J/kg
Mixed-layer CIN: -426 J/kg
Mixed-layer LCL: 2190 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 32 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.

384 
WGUS55 KSLC 311955
FFWSLC
UTC007-015-010000-
/O.NEW.KSLC.FF.W.0031.120731T1955Z-120801T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
155 PM MDT TUE JUL 31 2012

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN CARBON COUNTY IN UTAH
  NORTHWESTERN EMERY COUNTY IN UTAH INCLUDING THE SEELEY BURN SCAR
  AND HUNTINGTON CREEK THAN RUNS THROUGH HUNTINGTON. 

* UNTIL 600 PM MDT

* AT 151 PM MDT...DOPPLER RADAR INDICATED THAT HEAVY RAINFALL HAS
  BEEN FALLING OVER THE SEELEY BURN SCAR. RADAR ESTIMATES INDICATE   
THAT 0.3 INCHES OF RAINFALL HAS FALLEN ON THE BURN SCAR OVER THE 
PAST HOUR.

  IT IS EXPECTED THAT THIS AMOUNT OF RAINFALL WILL RESULT IN FLASH
  FLOODING AND A DEBRIS FLOW WHICH WILL IMPACT THE HUNTINGTON POWER
  PLANT LOCATED JUST UPSTREAM OF THE TOWN OF HUNTINGTON. DEBRIS AND
  ASH MAY ALSO IMPACT THE HUNTINGTON/CLEVELAND IRRIGATION COMPANY.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CLEAR
  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 3967 11124 3968 11102 3948 11097 3946 11107
      3932 11095 3936 11113 3949 11124

$$

HOSENFELD

3 follow-up statements

623 
WGUS75 KSLC 312232
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
432 PM MDT TUE JUL 31 2012

UTC007-015-010000-
/O.CON.KSLC.FF.W.0031.000000T0000Z-120801T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CARBON UT-EMERY UT-
432 PM MDT TUE JUL 31 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 600 PM MDT FOR
NORTHWESTERN EMERY AND SOUTHWESTERN CARBON COUNTIES...

AT 424 PM MDT...THUNDERSTORM ACTIVITY OVER THE SEELEY BURN SCAR HAS 
DIMINISHED...HOWEVER IT IS ANTICIPATED THAT MUD FLOWS ARE COURSING 
THROUGH THE HUNTINGTON CREEK DRAINAGE.  ONCE OUT OF HUNTINGTON 
CANYON THE HUNTINGTON POWERPLANT AND THE HUNTINGTON IRRIGATION 
STRUCTURES NEAR THE TOWN OF HUNTINGTON MAY BE IMPACTED BY THE MUD 
FLOWS.

IF YOU ARE TRAVELING THROUGH HUNTINGTON CANYON OR DOWNSTREAM OF THE 
DRAINAGE...PLEASE ENSURE FOR YOUR SAFETY.

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 3967 11124 3968 11102 3948 11097 3946 11107
      3932 11095 3936 11113 3949 11124

$$

MCINERNEY

701 
WGUS75 KSLC 010004
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
604 PM MDT TUE JUL 31 2012

UTC007-015-010000-
/O.CON.KSLC.FF.W.0031.000000T0000Z-120801T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CARBON UT-EMERY UT-
604 PM MDT TUE JUL 31 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 600 PM MDT FOR
NORTHWESTERN EMERY AND SOUTHWESTERN CARBON COUNTIES...

AT 554 PM MDT...ALTHOUGH THUNDERSTORM ACTIVITY IN THE SEELEY BURN 
SCAR HAS DIMINISHED BUT NOT ALTOGETHER CEASED...THE FLASH FLOOD 
WARNING FOR THE SEELEY BURN SCAR HAS BEEN ALLOWED TO EXPIRE. THE 
ANTICIPATED RAINFALL FOR THIS AREA IS NOT EXPECTED TO PRODUCE ANY 
ADDITIONAL FLASH FLOODING.

A FLASH FLOOD ORIGINATING OUT OF HUNTINGTON CANYON CROSSED SR31 
EARLIER TODAY. 

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 3967 11124 3968 11102 3948 11097 3946 11107
      3932 11095 3936 11113 3949 11124

$$

MCINERNEY

497 
WGUS75 KSLC 010008
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
608 PM MDT TUE JUL 31 2012

UTC007-015-010016-
/O.EXP.KSLC.FF.W.0031.000000T0000Z-120801T0004Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CARBON UT-EMERY UT-
608 PM MDT TUE JUL 31 2012

...THE FLASH FLOOD WARNING HAS EXPIRED FOR NORTHWESTERN EMERY AND
SOUTHWESTERN CARBON COUNTIES...

AT 554 PM MDT...ALTHOUGH THUNDERSTORM ACTIVITY IN THE SEELEY 
BURN SCAR HAS DIMINISHED BUT NOT ALTOGETHER CEASED...THE FLASH FLOOD 
WARNING FOR THE SEELEY BURN SCAR HAS BEEN ALLOWED TO EXPIRE. THE 
ANTICIPATED RAINFALL FOR THIS AREA IS NOT EXPECTED TO PRODUCE ANY 
ADDITIONAL FLASH FLOODING.

A FLASH FLOOD ORIGINATING OUT OF HUNTINGTON CANYON CROSSED SR31 
EARLIER TODAY. 

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 3967 11124 3968 11102 3948 11097 3946 11107
      3932 11095 3936 11113 3949 11124

$$

MCINERNEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 3:35 AM MDT	Flash Flood Watch	SLC		18 hr
Jul 31, 3:00 PM MDT	Flash Flood Warning	SLC	Wayne	4 hr
Jul 31, 5:14 PM MDT	Areal Flood Advisory	SLC	Washington	65 min
Jul 31, 5:25 PM MDT	Flash Flood Warning	SLC	Kane, Washington	4 hr

Nearby

Flash Flood Warnings in Utah, 2012 Every 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.