Alert archive / Utah / Flash Flood Warnings in 2007

Flash Flood Warning 8, NWS Salt Lake City, UT

July 25, 2007Tooele County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 25, 2007, 4:43 PM MDT for Tooele County, Utah. It took effect at Jul 25, 2007, 4:48 PM MDT. It was in force for 3 hr. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 25, 2007, 4:43 PM MDT (22:43 UTC)
In effect from
Jul 25, 2007, 4:48 PM MDT
Expired
Jul 25, 2007, 7:45 PM MDT
In force
3 hr
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Tooele County, UT

The radar

The Salt Lake City radar (KMTX), 107 km from the middle of the area, began a volume at 22:45 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
Jul 25, 6:20 PM MDTFLASH FLOOD3 W Grantsville, UTDEBRIS FLOW FROM KIMBELL BURN SCAR CROSSED STATE ROAD 186 WEST OF THE TOWN OF GRANTSVILLE. ROAD CLOSED BY FLOWING MUD AND DEBRIS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Elko, NV (KLKN), launched 12:00Z, 10.7 hours before the alert went out and 102 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, Elko, NV at 12:00Z on 2007-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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, Elko, NV at 12:00Z on 2007-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -30 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1892 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
-30 m²/s²
0-3 km storm-relative helicity
27 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 252248
FFWSLC
UTC045-260145-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
443 PM MDT WED JUL 25 2007

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL TOOELE COUNTY IN UTAH...
  THIS INCLUDES THE CITY OF GRANTSVILLE...

* UNTIL 745 PM MDT

* AT 436 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
HEAVY RAINFALL OVER THE KIMBELL FIRE BURN SCAR WHICH IS LOCATED WEST 
FROM THE TOWN OF GRANTSVILLE.

* AS A RESULT OF THE INTENSE RAINFALL...A DEBRIS FLOW IS ANTICIPATED 
TO FLOW OVER STATE ROAD 138 NEAR MILE MARKERS 4 AND 5...BUT MAY BE 
LARGER DEPENDING ON THE AMOUNT OF RAINFALL TO FALL ON THE AREA.

A DEBRIS FLOW IS A VERY DANGEROUS EVENT. THEY TYPICALLY MOVE VERY 
FAST AND HAVE THE POTENTIAL FOR GREAT DESTRUCTION.  THIS DEBRIS FLOW 
IS EXPECTED TO BE SMALL IN SCALE...ONLY AFFECTING STATE ROAD 
138...BUT VERY DANGEROUS FOR THOSE WHO MAY VENTURE NEAR THIS AREA.

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 4049 11253 4062 11247 4070 11253 4063 11262
      4056 11261

$$

MCINERNEY
2 follow-up statements
000 
WGUS75 KSLC 260007
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
557 PM MDT WED JUL 25 2007

UTC045-260145-
TOOELE UT-
557 PM MDT WED JUL 25 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM MDT FOR EAST
CENTRAL TOOELE COUNTY...

AT 554 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR HAS ESTIMATED 
2 TO 3 INCHES OF PRECIPITATION HAS FALLEN OVER THE KIMBELL BURN 
SCAR.  REPORTS OF MUDDY WATER FLOWING OUT OF THE BURN AREA HAVE BEEN 
RECEIVED. AS OF 6 PM THIS EVENING...CONCENTRATED EFFLUENT IS 
CROSSING THE ROAD AND STATE ROAD 138 NORTH OF GRANTSVILLE HAS BEEN 
CLOSED. 

THIS AREA WILL REMAIN VERY DANGEROUS THROUGHOUT THE NIGHTTIME HOURS 
AND SHOULD BE AVOIDED.  

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 4049 11253 4062 11247 4070 11253 4063 11262
      4056 11261

$$

MCINERNEY
000 
WGUS75 KSLC 260143
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
739 PM MDT WED JUL 25 2007

UTC045-260149-
TOOELE UT-
739 PM MDT WED JUL 25 2007

...THE FLASH FLOOD WARNING WILL EXPIRE AT 745 PM MDT FOR EAST CENTRAL
TOOELE COUNTY...

HEAVY RAIN HAS TAPERED OFF ACROSS THE WARNING AREA.

HEAVY EQUIPMENT HAS BEEN BROUGHT IN TO REMOVE DEBRIS FLOW
ON STATE ROUTE 138 NEAR GRANTSVILLE. BASEMENT FLOODING
HAS ALSO OCCURRED.

DUE TO THE BURN SCAR AND CONTINUED LIGHT RUNOFF THIS AREA
WILL REMAIN UNSTABLE AND ADDITIONAL FLOWS ARE POSSIBLE.

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 4049 11253 4062 11247 4070 11253 4063 11262
      4056 11261

$$

TARDY

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 6:22 PM MDTFlash Flood WarningSLCRich113 min
Jul 25, 3:46 PM MDTFlash Flood WatchSLC8 hr
Jul 25, 4:23 PM MDTSevere Thunderstorm WarningSLCSummit38 min
Jul 25, 5:58 PM MDTSevere Thunderstorm WarningSLCDavis, Salt Lake47 min

Nearby

Flash Flood Warnings in Utah, 2007Every flash flood warning in 2007

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.