Alert archive / Utah / Flash Flood Warnings in 2008

Flash Flood Warning 21, NWS Salt Lake City, UT

August 7, 2008Emery County, Wayne County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 7, 2008, 4:25 PM MDT for Emery County, 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 7, 2008, 4:25 PM MDT (22:25 UTC)
Expired
Aug 7, 2008, 7:30 PM MDT
In force
3 hr
Issued by
NWS Salt Lake City, UT
Area
Storm-based polygon
Flood severity
None

Counties Emery County, UT, Wayne County, UT

The radar

The Cedar City radar (KICX), 205 km from the middle of the area, began a volume at 22:28 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, 10.4 hours before the alert went out and 214 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 2008-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 347 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 12:00Z on 2008-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
347 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
935 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
47 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.

000 
WGUS55 KSLC 072226
FFWSLC
UTC015-055-080130-
/O.NEW.KSLC.FF.W.0021.080807T2225Z-080808T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
425 PM MDT THU AUG 7 2008

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL EMERY COUNTY IN UTAH...
  NORTH CENTRAL WAYNE COUNTY IN UTAH...

* UNTIL 730 PM MDT

* AT 418 PM MDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH
  FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO GOBLIN
  VALLEY

THE WILD HORSE CREEK DRAINAGE IS EXPERIENCING FLASH FLOODING. THERE 
HAVE BEEN REPORTS OF THREE TO FOUR FEET OF WATER FLOWING ACROSS AREA 
ROADS. ROADS...CREEK CROSSINGS...AND NORMALLY DRY WASHES WILL BE 
IMPASSABLE THROUGH THE EARLY EVENING. 

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

LAT...LON 3861 11096 3862 11069 3843 11071 3844 11095
TIME...MOT...LOC 2225Z 180DEG 0KT 3853 11073

$$

ES
1 follow-up statement
000 
WGUS75 KSLC 080124
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
721 PM MDT THU AUG 7 2008

UTC015-055-080131-
/O.EXP.KSLC.FF.W.0021.000000T0000Z-080808T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-EMERY UT-
721 PM MDT THU AUG 7 2008

...THE FLASH FLOOD WARNING WILL EXPIRE AT 730 PM MDT FOR SOUTH
CENTRAL EMERY AND NORTH CENTRAL WAYNE COUNTIES...

RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED AND LOCAL LAW 
ENFORCEMENT HAS REPORTED THAT ROADS HAVE REOPENED IN THE WILD HORSE 
CREEK DRAINAGE. THEREFORE... THE FLASH FLOOD WARNING HAS BEEN 
ALLOWED TO EXPIRE. SOME CREEKS AND WASHES NEAR THE ROADS MAY STILL 
BE RUNNING HIGHER AND FASTER THAN USUAL. PART OF THIS WARNING AREA 
REMAINS IN A DRY WASH AND SMALL STREAM ADVISORY. MONITOR NOAA 
WEATHER RADIO OR LOCAL TELEVISION OR RADIO FOR THE LATEST WEATHER 
INFORMATION.

LAT...LON 3861 11096 3862 11069 3843 11071 3844 11095
TIME...MOT...LOC 0121Z 180DEG 0KT 3853 11073

$$

ES

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 7:22 PM MDTFlash Flood WarningSLCWashington4 hr
Aug 7, 3:08 AM MDTFlash Flood WatchSLC19 hr
Aug 7, 2:22 PM MDTAreal Flood AdvisorySLCEmery, Sanpete, Sevier3 hr
Aug 7, 3:07 PM MDTAreal Flood AdvisorySLCUtah, Wasatch3 hr
Aug 7, 3:15 PM MDTAreal Flood AdvisorySLCWayne3 hr
Aug 7, 3:59 PM MDTFlash Flood WarningSLCWayne3 hr

Nearby

Flash Flood Warnings in Utah, 2008Every flash flood warning in 2008

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.