Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 2, NWS Salt Lake City, UT

June 29, 2011Garfield County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jun 29, 2011, 2:22 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
Jun 29, 2011, 2:22 PM MDT (20:22 UTC)
Expired
Jun 29, 2011, 5:15 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), 108 km from the middle of the area, began a volume at 20:23 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 8.4 hours before the alert went out and 273 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, Flgstf/Belemont, AZ at 12:00Z on 2011-06-29Temperature 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 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2011-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 square meters per square second.19395878Sfc1 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
2643 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
203 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.

380 
WGUS55 KSLC 292022
FFWSLC
UTC017-292315-
/O.NEW.KSLC.FF.W.0002.110629T2022Z-110629T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
222 PM MDT WED JUN 29 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL GARFIELD COUNTY IN UTAH...
  THIS INCLUDES ALVEY WASH NEAR THE CITY OF ESCALANTE...

* UNTIL 515 PM MDT

* AT 212 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A HEAVY THUNDERSTORM OVER ALVEY WASH NEAR THE TOWN OF              
  ESCALANTE...WHICH FLOWS INTO THE ESCALANTE RIVER.

* THE STORM PRODUCING FLASH FLOODING WILL OTHERWISE REMAIN OVER
  MAINLY RURAL AREAS OF THE INDICATED COUNTY.

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 3770 11167 3778 11162 3778 11157 3773 11161
      3762 11158 3757 11164 3760 11174

$$

HOSENFELD/MCINERNEY
2 follow-up statements
345 
WGUS75 KSLC 292227
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
427 PM MDT WED JUN 29 2011

UTC017-292315-
/O.CON.KSLC.FF.W.0002.000000T0000Z-110629T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-
427 PM MDT WED JUN 29 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM MDT FOR SOUTH
CENTRAL GARFIELD COUNTY...INCLUDING ALVEY WASH NEAR THE CITY OF 
ESCALANTE... 

AT 418 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT THE HEAVY RAIN HAS MOVED NORTH OF THE WARNED AREA. 

HEAVY RUNOFF WILL CONTINUE ALONG ALVEY WASH THROUGH 515 PM.

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 3770 11167 3778 11162 3778 11157 3773 11161
      3762 11158 3757 11164 3760 11174

$$

HOSENFELD
178 
WGUS75 KSLC 292311
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
511 PM MDT WED JUN 29 2011

UTC017-292320-
/O.EXP.KSLC.FF.W.0002.000000T0000Z-110629T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-
511 PM MDT WED JUN 29 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 515 PM MDT FOR ALVEY WASH 
IN SOUTH CENTRAL GARFIELD COUNTY...

THUNDERSTORMS HAVE MOVED OUT OF THE AREA...AND RUNOFF HAS 
DIMINISHED. THUNDERSTORMS ARE STILL DEVELOPING IN THE AREA...BUT 
NONE ARE THREATENING ALVEY WASH. 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 3770 11167 3778 11162 3778 11157 3773 11161
      3762 11158 3757 11164 3760 11174

$$

HOSENFELD

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 1:40 PM MDTSevere Thunderstorm WarningSLCDavis, Morgan, Salt Lake20 min
Jun 29, 1:58 PM MDTSevere Thunderstorm WarningSLCDavis, Morgan, Salt Lake, Summit32 min
Jun 29, 2:55 PM MDTSpecial Weather StatementSLCCache, Rich50 min
Jun 29, 2:58 PM MDTSevere Thunderstorm WarningSLCCache, Rich19 min
Jun 29, 3:16 PM MDTSpecial Weather StatementSLCSalt Lake44 min
Jun 29, 3:46 PM MDTSevere Thunderstorm WarningSLCCarbon, Duchesne29 min
Jun 29, 3:50 PM MDTRed Flag WarningSLC29 hr
Jun 29, 3:53 PM MDTSpecial Weather StatementSLCDavis, Salt Lake52 min
Jun 29, 3:58 PM MDTSevere Thunderstorm WarningSLCDavis, Morgan, Salt Lake32 min
Jun 29, 4:14 PM MDTSpecial Weather StatementSLCCache, Rich, Weber46 min
Jun 29, 4:22 PM MDTSpecial Weather StatementSLCWeber23 min
Jun 29, 4:34 PM MDTSevere Thunderstorm WarningSLCGarfield, Kane26 min
Jun 29, 5:03 PM MDTSevere Thunderstorm WarningSLCGarfield, Kane, San Juan27 min
Jun 29, 5:24 PM MDTSevere Thunderstorm WarningSLCEmery, Sanpete, Sevier25 min
Jun 29, 5:55 PM MDTSpecial Weather StatementSLCWasatch50 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.