Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 25, NWS Salt Lake City, UT

August 3, 2011Piute County, Sevier County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 3, 2011, 10:26 PM MDT for Piute County, Sevier 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 3, 2011, 10:26 PM MDT (04:26 UTC)
Expired: Aug 4, 2011, 1:15 AM MDT
In force: 3 hr
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Flood severity: None

Counties Piute County, UT, Sevier County, UT

The radar

The Cedar City radar (KICX), 116 km from the middle of the area, began a volume at 04:26 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

Time	Report	Where	Remark
Aug 4, 1:08 AM MDT	FLASH FLOOD	3 Wsw Sevier, UT	FLASH FLOOD REPORTED ALONG CLEAR CREEK NEAR THE FREMONT INDIAN STATE PARK. CLEAR CREEK ROAD CLOSED DUE DEBRIS.

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

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 00:00Z, 4.4 hours before the alert went out and 249 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3189 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -26 m²/s²
0-3 km storm-relative helicity: 32 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.

345 
WGUS55 KSLC 040426
FFWSLC
UTC031-041-040715-
/O.NEW.KSLC.FF.W.0025.110804T0426Z-110804T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1026 PM MDT WED AUG 3 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR CLEAR CREEK...
  NORTHWESTERN PIUTE COUNTY IN UTAH
  SOUTHWESTERN SEVIER COUNTY IN UTAH

* UNTIL 115 AM MDT

* AT 1016 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT OVER AN INCH OF RAIN HAS FALLEN OVER THE DRAINAGES LEADING INTO 
CLEAR CREAK NEAR FREMONT INDIAN STATE PARK. THESE DRAINAGES INCLUDE 
FISH CREEK...SHINGLE CREEK...AND POLE CREEK. LAW ENFORCEMENT 
REPORTED THAT THE CLEAR CREEK ROAD IS BEING IMPACTED. I-70 IS NOT 
EXPECTED TO EXPERIENCE ANY FLASH FLOODING. 

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 3863 11247 3864 11241 3864 11233 3861 11226
      3857 11225 3850 11234 3849 11238 3846 11250
      3852 11252

$$

HOSENFELD

1 follow-up statement

227 
WGUS75 KSLC 040714
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
114 AM MDT THU AUG 4 2011

UTC031-041-040722-
/O.EXP.KSLC.FF.W.0025.000000T0000Z-110804T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PIUTE UT-SEVIER UT-
114 AM MDT THU AUG 4 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 115 AM MDT FOR SOUTHWESTERN
SEVIER AND NORTHWESTERN PIUTE COUNTIES...

RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED GREATLY AND ANY 
ADDITIONAL RAINFALL WILL BE LIGHT. WATER LEVELS HAVE DECREASED ALONG 
CLEAR CREEK. 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 3863 11247 3864 11241 3864 11233 3861 11226
      3857 11225 3850 11234 3849 11238 3846 11250
      3852 11252

$$

PW

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 6:26 PM MDT	Special Weather Statement	SLC	Piute	34 min
Aug 3, 8:54 PM MDT	Special Weather Statement	SLC	Piute	21 min
Aug 4, 2:31 PM MDT	Severe Thunderstorm Warning	SLC	Juab, Utah	29 min
Aug 4, 3:14 PM MDT	Flash Flood Warning	SLC	Piute	3 hr
Aug 4, 3:27 PM MDT	Severe Thunderstorm Warning	SLC	Salt Lake	32 min
Aug 4, 3:28 PM MDT	Flash Flood Warning	SLC	Wayne	4 hr
Aug 4, 3:31 PM MDT	Severe Thunderstorm Warning	SLC	Duchesne	59 min
Aug 4, 3:41 PM MDT	Severe Thunderstorm Warning	SLC	Utah	64 min
Aug 4, 3:44 PM MDT	Flash Flood Warning	SLC	Garfield, Piute	117 min
Aug 4, 3:58 PM MDT	Flash Flood Warning	SLC	Wayne	2 hr
Aug 4, 4:07 PM MDT	Severe Thunderstorm Warning	SLC	Salt Lake, Utah	38 min
Aug 4, 4:11 PM MDT	Severe Thunderstorm Warning	SLC	Duchesne, Wasatch	36 min
Aug 4, 4:43 PM MDT	Severe Thunderstorm Warning	SLC	Juab	62 min
Aug 4, 4:56 PM MDT	Severe Thunderstorm Warning	SLC	Emery	34 min
Aug 4, 5:27 PM MDT	Severe Thunderstorm Warning	SLC	Utah	63 min

Nearby

Flash Flood Warnings in Utah, 2011 Every 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.