Alert archive / Utah / Flash Flood Warnings in 2012

Flash Flood Warning 28, NWS Salt Lake City, UT

July 30, 2012Carbon County, Emery County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 30, 2012, 1:33 PM MDT for Carbon County, Emery County, Utah. It was in force for 4 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: Jul 30, 2012, 1:33 PM MDT (19:33 UTC)
Expired: Jul 30, 2012, 5:30 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), 227 km from the middle of the area, began a volume at 19:34 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
Jul 30, 3:40 PM MDT	FLASH FLOOD	7 W Hiawatha, UT	FLASH FLOODING ON THE SEELEY BURN SCAR. SOUTH HUGHES, NUCKWOODWARD, AND CHUTE CANYON ALL EXPERIENCED FLASH FLOODING.

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

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 7.6 hours before the alert went out and 158 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: 12 J/kg
Mixed-layer CIN: -418 J/kg
Mixed-layer LCL: 2952 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 66 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.

709 
WGUS55 KSLC 301933
FFWSLC
UTC007-015-302330-
/O.NEW.KSLC.FF.W.0028.120730T1933Z-120730T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
133 PM MDT MON JUL 30 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 HUNTINGTON CREEK DRAINAGES ORIGINATING IN
  THE SEELEY BURN SCAR. 

* UNTIL 530 PM MDT

* AT 130 PM MDT...DOPPLER RADAR INDICATED THAT HEAVY RAINFALL HAS
  BEEN FALLING OVER THE SEELEY BURN SCAR. RADAR ESTIMATES INDICATE   
THAT 0.5 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.

* THE STORM PRODUCING FLASH FLOODING WILL OTHERWISE REMAIN OVER
  MAINLY RURAL AREAS OF THE INDICATED COUNTY.

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 3966 11107 3942 11102 3933 11094 3933 11115
      3951 11122 3960 11122

$$

HOSENFELD

2 follow-up statements

753 
WGUS75 KSLC 302141
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
341 PM MDT MON JUL 30 2012

UTC007-015-302330-
/O.CON.KSLC.FF.W.0028.000000T0000Z-120730T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CARBON UT-EMERY UT-
341 PM MDT MON JUL 30 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM MDT FOR
NORTHWESTERN EMERY AND SOUTHWESTERN CARBON COUNTIES...INCLUDING
THE SEELEY BURN SCAR...

AT 336 PM MDT...DOPPLER RADAR INDICATED THAT HEAVY RAINFALL HAS BEEN 
FALLING OVER THE SEELY BURN SCAR. RAIN HAS DIMINISHED...BUT THE 
POTENTIAL FOR A DEBRIS FLOW IN THE WARNED AREA STILL EXISTS. 

IT IS EXPECTED THAT THIS 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.

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 3966 11107 3942 11102 3933 11094 3933 11115
      3951 11122 3960 11122

$$

HOSENFELD

943 
WGUS75 KSLC 302200
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
400 PM MDT MON JUL 30 2012

UTC007-015-302330-
/O.CON.KSLC.FF.W.0028.000000T0000Z-120730T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CARBON UT-EMERY UT-
400 PM MDT MON JUL 30 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM MDT FOR
NORTHWESTERN EMERY AND SOUTHWESTERN CARBON COUNTIES...

AT 348 PM MDT...A LARGE DEBRIS FLOW HAS CLOSED SR 31 THROUGH THE 
SEELEY BURN SCAR.  THE DEBRIS FLOW IS CURRENTLY FLOWING OUT OF SOUTH 
HUGHES, NUK WOODWARD, AND SHUTE DRAINAGES IN THE SEELEY BURN SCAR.  

RAINFALL RADAR ESTIMATES OF 0.30" HAVE PRODUCED THE FLOOD. IT IS 
ESTIMATED THAT THE MAIN DRAINAGES OF HUNTINGTON CREEK HAS PRODUCED 
OVER 7 DEBRIS FLOWS SINCE THE FIRE WAS EXTINGUISHED. IT IS 
ANTICIPATED THAT THE MUD FLOW WILL THIN OUT AS IT FLOWS DOWNSTREAM 
AND POSSIBLY AFFECT IRRIGATION STRUCTURES SOUTH OF HUNTINGTON.

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 3966 11107 3942 11102 3933 11094 3933 11115
      3951 11122 3960 11122

$$

MCINERNEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 3:51 AM MDT	Flash Flood Watch	SLC		18 hr
Jul 30, 2:01 PM MDT	Flash Flood Warning	SLC	Juab, Sanpete, Utah	4 hr
Jul 30, 4:32 PM MDT	Flash Flood Warning	SLC	Washington	3 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.