Alert archive / Utah / Flash Flood Warnings in 2012

Flash Flood Warning 22, NWS Salt Lake City, UT

July 24, 2012Garfield County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 24, 2012, 12:56 PM MDT for Garfield 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
Jul 24, 2012, 12:56 PM MDT (18:56 UTC)
Expired
Jul 24, 2012, 4:00 PM MDT
In force
3 hr
Issued by
NWS Salt Lake City, UT
Area
Storm-based polygon
Flood severity
None

County Garfield County, UT

The radar

The Cedar City radar (KICX), 163 km from the middle of the area, began a volume at 18:58 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 255 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 2012-07-24Temperature 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 2012-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -16 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
2151 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
-5 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.

968 
WGUS55 KSLC 241856
FFWSLC
UTC017-242200-
/O.NEW.KSLC.FF.W.0022.120724T1856Z-120724T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1256 PM MDT TUE JUL 24 2012

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CAPITOL REEF NATIONAL PARK IN NORTH CENTRAL GARFIELD COUNTY IN UTAH

* UNTIL 400 PM MDT

* AT 1248 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR 
INDICATED   HEAVY RAIN FROM A THUNDERSTORM OVER THE OAK CREEK AND 
PLEASANT CREEK DRAINAGES. ADDITIONAL THUNDERSTORMS ARE DEVELOPING TO 
THE WEST AND WILL CONTINUE TO MOVE OVER THE AREA.

FLASH FLOODING IS EXPECTED IN THESE DRAINAGES OVER THE NEXT SEVERAL 
HOURS. THIS WARNING INCLUDES A PORTION OF THE CAPITOL REEF NATIONAL 
PARK WITHIN THE WATERPOCKET FOLD AREA INCLUDING THE SHEETS GULCH 
AREA. 

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 3802 11118 3811 11122 3816 11108 3815 11105
      3814 11104 3805 11105

$$

KRUSE
2 follow-up statements
454 
WGUS75 KSLC 242035
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
235 PM MDT TUE JUL 24 2012

UTC017-242200-
/O.CON.KSLC.FF.W.0022.000000T0000Z-120724T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-
235 PM MDT TUE JUL 24 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 PM MDT FOR THE 
OAK CREEK AND PLEASANT CREEK DRAINAGES IN AND NEAR CAPITOL REEF  
NATIONAL PARK IN NORTH CENTRAL GARFIELD COUNTY...

AT 227 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE MODERATE TO HEAVY RAINFALL OVER THE OAK CREEK AND PLEASANT 
CREEK DRAINAGES.

FLASH FLOODING CONTINUES TO BE LIKELY ACROSS THE OAK CREEK AND 
PLEASANT CREEK DRAINAGES INCLUDING THE SHEETS GULCH AREA. ADDITIONAL 
HEAVY RAINFALL IS OCCURRING TO THE SOUTH AND WEST OF THESE DRAINAGES.

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 3802 11118 3811 11122 3816 11108 3815 11105
      3814 11104 3805 11105

$$

KRUSE
113 
WGUS75 KSLC 242152
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
352 PM MDT TUE JUL 24 2012

UTC017-242201-
/O.EXP.KSLC.FF.W.0022.000000T0000Z-120724T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-
352 PM MDT TUE JUL 24 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 400 PM MDT FOR THE OAK 
CREEK AND PLEASANT CREEK DRAINAGES INCLUDING THE SHEETS GULCH IN 
NORTH CENTRAL GARFIELD COUNTY...

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 3802 11118 3811 11122 3816 11108 3815 11105
      3814 11104 3805 11105

$$

KRUSE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 8:58 AM MDTFlash Flood WarningSLCWashington6 hr
Jul 24, 1:28 PM MDTFlash Flood WarningSLCWayne4 hr
Jul 24, 1:34 PM MDTSpecial Weather StatementSLCWashington41 min
Jul 24, 1:45 PM MDTSevere Thunderstorm WarningSLCWashington18 min
Jul 24, 2:44 PM MDTFlash Flood WarningSLCWashington6 hr
Jul 24, 3:18 PM MDTSpecial Weather StatementSLCIron42 min

Nearby

Flash Flood Warnings in Utah, 2012Every flash flood warning in 2012

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.