Alert archive / Utah / Flash Flood Warnings in 2012

Flash Flood Warning 44, NWS Salt Lake City, UT

August 10, 2012Wayne County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 10, 2012, 12:40 PM MDT for Wayne County, Utah. It was in force for 3 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
Aug 10, 2012, 12:40 PM MDT (18:40 UTC)
Expired
Aug 10, 2012, 3:45 PM MDT
In force
3 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), 156 km from the middle of the area, began a volume at 18:41 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

Grand Junction, CO (KGJT), launched 12:00Z, 6.7 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-pSkew-T log-p diagram, Grand Junction, CO at 12:00Z on 2012-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2012-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2532 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
70 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.

671 
WGUS55 KSLC 101840
FFWSLC
UTC055-102145-
/O.NEW.KSLC.FF.W.0044.120810T1840Z-120810T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1240 PM MDT FRI AUG 10 2012

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL WAYNE COUNTY IN UTAH...INCLUDING CAPITOL REEF NATIONAL 
  PARK

* UNTIL 345 PM MDT

* AT 1233 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR 
  INDICATED HEAVY RAIN FROM A THUNDERSTORM OVER SULPHUR CREEK 
  DRAINAGE.

* FLASH FLOODING IS EXPECTED ALONG SULPHUR CREEK FROM ITS HEADWATERS 
  TO ITS CONFLUENCE WITH THE FREMONT RIVER IN CAPITOL REEF NATIONAL 
  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 3832 11135 3831 11130 3828 11129 3827 11135

$$

MPS
2 follow-up statements
043 
WGUS75 KSLC 102000
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
200 PM MDT FRI AUG 10 2012

UTC055-102145-
/O.CON.KSLC.FF.W.0044.000000T0000Z-120810T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
200 PM MDT FRI AUG 10 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM MDT FOR 
SULPHUR CREEK IN CAPITOL REEF NATIONAL PARK IN CENTRAL WAYNE 
COUNTY...

AT 150 PM MDT...NATIONAL PARK SERVICE RANGERS IN CAPITOL REEF 
REPORTED SULPHUR CREEK WAS RISING RAPIDLY NEAR THE VISITOR 
CENTER...THAT FLASH FLOODING WAS LIKELY OCCURRING UPSTREAM ALONG THE 
CREEK...AND APPEARED IMMINENT ALONG SULPHUR CREEK NEAR THE VISITOR 
CENTER. 

THOSE PERSONS NEAR OR AROUND SULPHUR CREEK SHOULD MOVE TO HIGHER 
GROUND...AND STAY AWAY FROM THE 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 3832 11135 3831 11130 3828 11129 3827 11135

$$

MPS
547 
WGUS75 KSLC 102142
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
342 PM MDT FRI AUG 10 2012

UTC055-102151-
/O.EXP.KSLC.FF.W.0044.000000T0000Z-120810T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
342 PM MDT FRI AUG 10 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 345 PM MDT FOR SULPHUR 
CREEK WITHIN CAPITOL REEF NATIONAL PARK IN CENTRAL WAYNE COUNTY...

RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED GREATLY AND RIVER 
AND STREAM LEVELS HAVE DECREASED. ADDITIONAL RAINFALL WILL CONTINUE 
TO ALLOW THE CREEK TO RUN HIGH...HOWEVER ADDITIONAL FLASH FLOODING 
IS NOT ANTICIPATED. THEREFORE...THE FLASH FLOOD WARNING HAS BEEN 
ALLOWED TO EXPIRE. MONITOR NOAA WEATHER RADIO OR LOCAL TELEVISION OR 
RADIO FOR THE LATEST WEATHER INFORMATION.

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 3832 11135 3831 11130 3828 11129 3827 11135

$$

MPS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 12:29 PM MDTFlash Flood WarningSLCEmery3 hr
Aug 10, 1:25 PM MDTFlash Flood WarningSLCWayne3 hr
Aug 10, 4:17 PM MDTSpecial Weather StatementSLCEmery43 min
Aug 10, 4:45 PM MDTSpecial Weather StatementSLCTooele60 min
Aug 10, 5:51 PM MDTSpecial Weather StatementSLCDavis69 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.