Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 41, NWS Salt Lake City, UT

August 25, 2011Wayne County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 25, 2011, 3:25 PM MDT for Wayne County, Utah. It was in force for 3 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
Aug 25, 2011, 3:25 PM MDT (21:25 UTC)
Expired
Aug 25, 2011, 6:15 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), 161 km from the middle of the area, began a volume at 21:27 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

TimeReportWhereRemark
Aug 25, 4:40 PM MDTFLASH FLOODCapitol Reef Np, UTFLASH FLOOD IN SULPHER CREEK. WATER WAS 4-5 FT DEEP AT THE VISITOR CENTER.

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, 9.4 hours before the alert went out and 256 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 2011-08-25Temperature 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 2011-08-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 square meters per square second.1939Sfc1 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
2687 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
76 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.

288 
WGUS55 KSLC 252125
FFWSLC
UTC055-260015-
/O.NEW.KSLC.FF.W.0041.110825T2125Z-110826T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
325 PM MDT THU AUG 25 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL WAYNE COUNTY IN UTAH...SPECIFICALLY SULPHER CREEK IN       
  CAPITOL REEF NATIONAL PARK.

* UNTIL 615 PM MDT

* AT 318 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN FROM A THUNDERSTORM ACROSS THE HEADWATERS OF SULPHER    
  CREEK IN CAPITOL REEF NATIONAL PARK. RAINFALL ESTIMATES OF .50-.75 
  INCHES OF RAINFALL HAS OCCURRED OVER THE LAST HOUR FROM THIS       
  STORM...AND ADDITIONAL RAINFALL IS EXPECTED. RAINFALL OF THIS      
  INTENSITY HAS PRODUCED FLASH FLOODING ALONG THIS CREEK IN RECENT   
  WEEKS. ADDITIONAL TO THE FLASH FLOODING MENTIONED ABOVE...RAPID    
  RISES TO THE FREMONT RIVER ARE POSSIBLE WITHIN 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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN SALT
LAKE CITY.

&&

LAT...LON 3834 11138 3839 11130 3829 11108 3825 11110
      3826 11134

$$

MERRILL
2 follow-up statements
804 
WGUS75 KSLC 252257
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
457 PM MDT THU AUG 25 2011

UTC055-260015-
/O.CON.KSLC.FF.W.0041.000000T0000Z-110826T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
457 PM MDT THU AUG 25 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM MDT FOR 
CENTRAL WAYNE COUNTY...SPECIFICALLY SULPHER CREEK IN CAPITOL REEF 
NATIONAL PARK.

AT 440 PM MDT...LOCAL LAW ENFORCEMENT OFFICIALS IN CAPITOL REEF 
NATIONAL PARK REPORTED THAT AN EARLIER THUNDERSTORM PRODUCED FLASH 
FLOODING ON SULPHER CREEK NEAR THE VISITOR CENTER. THIS FLOOD WILL 
CONTINUE TO WORK DOWNSTREAM AND DRAIN INTO THE FREMONT RIVER THROUGH 
615 PM MDT. AREAS DOWNSTREAM ALONG THE FREMONT RIVER BETWEEN CAPITOL 
REEF NATIONAL PARK AND CAINEVILLE CAN EXPECT A BRIEF RISE TO THE 
THAT RIVER.

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 3834 11138 3839 11130 3829 11108 3825 11110
      3826 11134

$$

MERRILL
318 
WGUS75 KSLC 260014
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
614 PM MDT THU AUG 25 2011

UTC055-260022-
/O.EXP.KSLC.FF.W.0041.000000T0000Z-110826T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
614 PM MDT THU AUG 25 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 615 PM MDT FOR CENTRAL 
WAYNE COUNTY...SPECIFICALLY SULPHER CREEK IN CAPITOL REEF NATIONAL 
PARK.

RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED GREATLY AND RIVER
AND STREAM LEVELS HAVE DECREASED. REPORTS INDICATE THAT FLOODING HAS
ENDED. 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 3834 11138 3839 11130 3829 11108 3825 11110
      3826 11134

$$

MERRILL

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 25, 5:31 PM MDTFlash Flood WarningSLCKane, Washington3 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.