Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 31, NWS Salt Lake City, UT

August 15, 2011Garfield County, Wayne County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 15, 2011, 6:38 PM MDT for Garfield County, Wayne County, Utah. It was in force for 6 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 15, 2011, 6:38 PM MDT (00:38 UTC)
Expired
Aug 16, 2011, 12:30 AM MDT
In force
6 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), 205 km from the middle of the area, began a volume at 00:40 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 00:00Z, 0.6 hours before the alert went out and 213 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 00:00Z on 2011-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 289 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2011-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 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
289 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
2697 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
-11 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.

048 
WGUS55 KSLC 160038
FFWSLC
UTC017-055-160630-
/O.NEW.KSLC.FF.W.0031.110816T0038Z-110816T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
638 PM MDT MON AUG 15 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE FREMONT RIVER BELOW CAINEVILLE AND THE DIRTY DEVIL RIVER FROM  
  HANKSVILLE TO HITE MARINA
  NORTHEASTERN GARFIELD COUNTY IN UTAH
  CENTRAL WAYNE COUNTY IN UTAH

* UNTIL 1230 AM MDT

* AT 617 PM MDT...PARK OFFICIALS IN CAPITOL REEF NATIONAL PARK       
  REPORTED FLASH FLOODING FROM A THUNDERSTORM THAT PASSED OVER THE   
  AREA EARLIER THIS AFTERNOON. A RIVER GAUGE ON THE FREMONT RIVER IN 
  CAINEVILLE HAS SHOWN A RISE IN RIVER FLOW TO JUST OVER 3000        
  CUBIC FEET PER SECOND /CFS/...FLOW PRIOR TO FLASH FLOOD EARLIER    
  TODAY WAS 45 CFS. THIS FLASH FLOOD IS EXPECTED TO CONTINUE         
  DOWNSTREAM TO THE CONFLUENCE OF THE DIRTY DEVIL RIVER...THEN       
  CONTINUE DOWN THE DIRTY DEVIL RIVER TO WHERE IT DRAINS INTO LAKE   
  POWELL NEAR HITE MARINA.

* THIS IS A LARGE AND DANGEROUS FLASH FLOOD.

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.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 3835 11104 3839 11074 3843 11067 3836 11053
      3814 11037 3788 11037 3789 11040 3813 11044
      3838 11068 3834 11079 3831 11101

$$

MERRILL
2 follow-up statements
506 
WGUS75 KSLC 160335
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
935 PM MDT MON AUG 15 2011

UTC017-055-160630-
/O.CON.KSLC.FF.W.0031.000000T0000Z-110816T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-WAYNE UT-
935 PM MDT MON AUG 15 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 AM MDT FOR
CENTRAL WAYNE AND NORTHEASTERN GARFIELD COUNTIES...

AT 924 PM MDT...THE FREMONT RIVER AT CAINEVILLE HAS PEAKED AT A FLOW 
OF 5221 CUBIC FEET PER SECOND. ALTHOUGH THE FREMONT IS CURRENTLY 
RECEDING...FLOWS WILL REMAIN ELEVATED THROUGH LATE THIS EVENING. THE 
WATER FROM THE FREMONT WILL FLOW INTO THE DIRTY DEVIL RIVER. THE 
WATER LEVEL AT THE DIRTY DEVIL AT POISON SPRINGS IS CURRENTLY 
RISING...AND THE FLOW ALONG THE DIRTY DEVIL WILL REMAIN ELEVATED 
THROUGH MIDNIGHT TONIGHT.

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 3835 11104 3839 11074 3843 11067 3836 11053
      3814 11037 3788 11037 3789 11040 3813 11044
      3838 11068 3834 11079 3831 11101

$$

LC
553 
WGUS75 KSLC 160630
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1230 AM MDT TUE AUG 16 2011

UTC017-055-160640-
/O.EXP.KSLC.FF.W.0031.000000T0000Z-110816T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-WAYNE UT-
1230 AM MDT TUE AUG 16 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR CENTRAL WAYNE AND
NORTHEASTERN GARFIELD COUNTIES...

RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED GREATLY AND RIVER 
AND STREAM LEVELS HAVE DECREASED. THEREFORE... THE FLASH FLOOD 
WARNING HAS BEEN ALLOWED TO EXPIRE. MONITOR NOAA WEATHER RADIO OR 
LOCAL TELEVISION OR RADIO FOR THE LATEST WEATHER INFORMATION.

LAT...LON 3835 11104 3839 11074 3843 11067 3836 11053
      3814 11037 3788 11037 3789 11040 3813 11044
      3838 11068 3834 11079 3831 11101

$$

MPS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 15, 6:01 PM MDTSevere Thunderstorm WarningSLCCarbon, Duchesne44 min
Aug 15, 6:09 PM MDTSpecial Weather StatementSLCUtah6 min
Aug 15, 6:37 PM MDTSpecial Weather StatementSLCDuchesne38 min
Aug 15, 7:09 PM MDTSevere Thunderstorm WarningSLCDuchesne51 min

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.