Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 40, NWS Salt Lake City, UT

August 23, 2011Wayne County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 23, 2011, 1:49 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 23, 2011, 1:49 PM MDT (19:49 UTC)
Expired
Aug 23, 2011, 4:45 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), 160 km from the middle of the area, began a volume at 19:52 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, 7.8 hours before the alert went out and 258 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 2011-08-23Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Grand Junction, CO at 12:00Z on 2011-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 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
2719 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
95 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.

939 
WGUS55 KSLC 231949
FFWSLC
UTC055-232245-
/O.NEW.KSLC.FF.W.0040.110823T1949Z-110823T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
149 PM MDT TUE AUG 23 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

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

* UNTIL 445 PM MDT

* AT 142 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  THAT AROUND THREE QUARTERS OF AN INCH OF RAIN HAD FALLEN IN THE    
  DRAINAGES LEADING INTO GRAND WASH. AS A RESULT...A FLASH FLOOD     
  WARNING IS IN EFFECT FOR GRAND WASH IN CAPITOL REEF NATIONAL PARK. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 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 3826 11133 3829 11123 3829 11112 3825 11117
      3823 11122 3819 11134

$$

HOSENFELD
2 follow-up statements
861 
WGUS75 KSLC 232046
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
246 PM MDT TUE AUG 23 2011

UTC055-232245-
/O.CON.KSLC.FF.W.0040.000000T0000Z-110823T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
246 PM MDT TUE AUG 23 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM MDT FOR
CENTRAL WAYNE COUNTY...

AT 242 PM MDT...RAINFALL IN THE AREA HAS DIMINISHED...BUT WATER IS
LIKELY STILL RUNNING DOWN GRAND WASH.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 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 3826 11133 3829 11123 3829 11112 3825 11117
      3823 11122 3819 11134

$$

HOSENFELD
070 
WGUS75 KSLC 232249
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
449 PM MDT TUE AUG 23 2011

UTC055-232256-
/O.EXP.KSLC.FF.W.0040.000000T0000Z-110823T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
449 PM MDT TUE AUG 23 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR CENTRAL WAYNE COUNTY 
INCLUDING GRAND WASH IN CAPITOL REEF NATIONAL PARK...

THE FLASH FLOOD WARNING FOR GRAND WASH IN CAPITOL REEF NATIONAL PARK 
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 3826 11133 3829 11123 3829 11112 3825 11117
      3823 11122 3819 11134

$$

GM

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 23, 12:55 PM MDTFlash Flood WarningSLCGarfield, Wayne4 hr

Nearby

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