Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 39, NWS Salt Lake City, UT

August 23, 2011Garfield County, Wayne County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 23, 2011, 12:55 PM MDT for Garfield County, Wayne 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
Aug 23, 2011, 12:55 PM MDT (18:55 UTC)
Expired
Aug 23, 2011, 4:45 PM MDT
In force
4 hr
Issued by
NWS Salt Lake City, UT
Area
Storm-based polygon
Flood severity
None

Counties Garfield County, UT, Wayne County, UT

The radar

The Cedar City radar (KICX), 163 km from the middle of the area, began a volume at 18:55 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, 6.9 hours before the alert went out and 254 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.

102 
WGUS55 KSLC 231855
FFWSLC
UTC017-055-232245-
/O.NEW.KSLC.FF.W.0039.110823T1855Z-110823T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1255 PM MDT TUE AUG 23 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR 
  NORTH CENTRAL GARFIELD COUNTY IN UTAH
  SOUTH CENTRAL WAYNE COUNTY IN UTAH...INCLUDING PLEASANT CREEK AND  
  CAPITOL GORGE IN CAPITOL REEF NATIONAL PARK.

* UNTIL 445 PM MDT

* AT 1245 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
  THAT AROUND AN INCH OF WATER HAS FALLEN ON THE DRAINAGES OF        
  PLEASANT CREEK. AS A RESULT...A FLASH FLOOD WARNING IS IN EFFECT   
  FOR PLEASANT CREEK...CAPITOL GORGE...AND SMALL WASHES IN THE AREA. 
  PLEASANT CREEK CROSSES THE SCENIC DRIVE IN CAPITOL REEF NATIONAL   
  PARK...AND THE NOTOM ROAD...BEFORE IT DRAINS INTO THE FREMONT      
  RIVER APPROXIMATELY TEN MILES EAST OF CAPITOL REEF. 

* 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 3823 11122 3825 11117 3829 11112 3828 11108
      3824 11110 3819 11111 3813 11117 3809 11126
      3819 11134

$$

HOSENFELD
2 follow-up statements
167 
WGUS75 KSLC 232045
FFSSLC

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

UTC017-055-232245-
/O.CON.KSLC.FF.W.0039.000000T0000Z-110823T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-WAYNE UT-
245 PM MDT TUE AUG 23 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM MDT FOR SOUTH
CENTRAL WAYNE AND NORTH CENTRAL GARFIELD COUNTIES...

AT 239 PM MDT...RAINFALL IN THE AREA HAS DIMINISHED...BUT WATER
IS STILL LIKELY RUNNING DOWN PLEASANT CREEK AND CAPITOL GORGE.

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 3823 11122 3825 11117 3829 11112 3828 11108
      3824 11110 3819 11111 3813 11117 3809 11126
      3819 11134

$$

HOSENFELD
398 
WGUS75 KSLC 232252
FFSSLC

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

UTC017-055-232300-
/O.EXP.KSLC.FF.W.0039.000000T0000Z-110823T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-WAYNE UT-
452 PM MDT TUE AUG 23 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR SOUTH CENTRAL WAYNE AND 
NORTH CENTRAL GARFIELD COUNTIES INCLUDING PLEASANT CREEK AND CAPITOL 
GORGE IN CAPITOL REEF NATIONAL PARK...

THE FLASH FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE FOR PLEASANT 
CREEK AND CAPITOL GORGE IN CAPITOL REEF NATIONAL PARK. 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 3823 11122 3825 11117 3829 11112 3828 11108
      3824 11110 3819 11111 3813 11117 3809 11126
      3819 11134

$$

GM

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 23, 1:49 PM MDTFlash Flood WarningSLCWayne3 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.