Alert archive / Utah / Flash Flood Warnings in 2012

Flash Flood Warning 32, NWS Salt Lake City, UT

July 31, 2012Wayne County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 31, 2012, 3:00 PM MDT for Wayne 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 31, 2012, 3:00 PM MDT (21:00 UTC)
Expired: Jul 31, 2012, 7:00 PM MDT
In force: 4 hr
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Flood severity: None

County Wayne County, UT

The radar

The Cedar City radar (KICX), 158 km from the middle of the area, began a volume at 21:03 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 31, 4:30 PM MDT	FLASH FLOOD	Capitol Reef Np, UT	3 FT FLOOD WAVE IN 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, 9.0 hours before the alert went out and 261 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1967 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 89 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.

585 
WGUS55 KSLC 312100
FFWSLC
UTC055-010100-
/O.NEW.KSLC.FF.W.0032.120731T2100Z-120801T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

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

* UNTIL 700 PM MDT

* AT 254 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN FROM A THUNDERSTORM OVER SULPHER CREEK JUST WEST AND    
  FLOWING INTO CAPITOL REEF NATIONAL PARK.  ADDITIONALLY...SEVERAL   
  WASHES TO THE SOUTH OF SR24 ARE EXPECTED TO FLOOD DUE TO THE HEAVY 
  RAINFALL.

RADAR RAINFALL ESTIMATES OF OVER 2 INCHES HAS FALLEN OVER THE 
HEADWATERS OF SULPHER CREEK.  THE THUNDERSTORM ACTIVITY IS 
PROPAGATING TO THE EAST AND DOWNSTREAM OF ALL THE DRAINAGES IN THE 
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 3844 11151 3847 11130 3835 11112 3828 11108
      3824 11116 3820 11131 3826 11145 3835 11156

$$

MCINERNEY

3 follow-up statements

027 
WGUS75 KSLC 312212
FFSSLC

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

UTC055-010100-
/O.CON.KSLC.FF.W.0032.000000T0000Z-120801T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
412 PM MDT TUE JUL 31 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM MDT FOR
WESTERN WAYNE COUNTY...

AT 406 PM MDT...NATIONAL WEATHER SERVICE RADAR INDICATED RAINFALL 
OVER THE SEELEY BURN SCAR HAS DIMINISHED. RADAR RAINFALL ESTIMATES 
OF 0.50 INCHES HAD FALLEN OVER THE AREA AROUND 2PM. HOWEVER...IT IS 
ANTICIPATED THAT MUDFLOWS FROM THE UPPER DRAINAGES IN THE HUNTINGTON 
CANYON AREA ARE COURSING THROUGH THE WATERSHED AND ARE EXPECTED TO 
CONTINUE UNTIL 6PM.

IF YOU ARE TRAVELING THROUGH HUNTINGTON CANYON...PLEASE TAKE 
MEASURES TO 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 3844 11151 3847 11130 3835 11112 3828 11108
      3824 11116 3820 11131 3826 11145 3835 11156

$$

MCINERNEY

908 
WGUS75 KSLC 312224 CCA
FFSSLC

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

UTC055-010100-
/O.COR.KSLC.FF.W.0032.000000T0000Z-120801T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
412 PM MDT TUE JUL 31 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM MDT FOR
WESTERN WAYNE COUNTY...

AT 406 PM MDT...THE HEADWATERS OF SULPHER CREEK AS OF 430PM ARE
FLASH FLOODING.  IT IS ANTICIPATED THAT THE FLOOD WILL REACH THE
CAPITOL REEF VISITORS CENTER AREA BY 545PM. THUNDERSTORM ACTIVITY
HAS MOVED ON TO THE EAST OF THE PARK.

IF YOU ARE TRAVELING THROUGH THE UPPER SECTION OF CAPITOL REEF
NATIONAL PARK...SPECIFICALLY SULPHER CREEK...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 3844 11151 3847 11130 3835 11112 3828 11108
      3824 11116 3820 11131 3826 11145 3835 11156

$$

MCINERNEY

675 
WGUS75 KSLC 010053
FFSSLC

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

UTC055-010101-
/O.EXP.KSLC.FF.W.0032.000000T0000Z-120801T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
653 PM MDT TUE JUL 31 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 700 PM MDT FOR WESTERN
WAYNE COUNTY...

SULPHER CREEK...WHICH FLOWS FROM WEST TO EAST THROUGH CAPITOL REEF 
NATIONAL EXPERIENCED A LARGE FLASH FLOOD WITH THE INITIAL SURGE OF 
WATER 4 FT. HIGH THROUGH THE PARK.  THE FLASH FLOOD ORIGINATED IN 
THE HEADWATER AREAS TO THE EAST OF CAPITOL REEF AND TERMINATED INTO 
THE FREEMONT RIVER.

RAINFALL OVER THE AREA HAS DIMINISHED AND THE THREAT OF FLASH 
FLOODING HAS PASSED.  AS A RESULT...THE FLASH FLOOD WARNING HAS BEEN 
ALLOWED TO EXPIRE.

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 3844 11151 3847 11130 3835 11112 3828 11108
      3824 11116 3820 11131 3826 11145 3835 11156

$$

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, 1:55 PM MDT	Flash Flood Warning	SLC	Carbon, Emery	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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.