Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 46, NWS Salt Lake City, UT

August 29, 2011Kane County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 29, 2011, 3:09 PM MDT for Kane County, Utah. It was in force for 4 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 29, 2011, 3:09 PM MDT (21:09 UTC)
Expired
Aug 29, 2011, 7:00 PM MDT
In force
4 hr
Issued by
NWS Salt Lake City, UT
Area
Storm-based polygon
Flood severity
None

County Kane County, UT

The radar

The Cedar City radar (KICX), 91 km from the middle of the area, began a volume at 21:11 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, 9.2 hours before the alert went out and 225 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 2011-08-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 42 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2011-08-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
42 J/kg
Mixed-layer CIN
-111 J/kg
Mixed-layer LCL
1974 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
78 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

098 
WGUS55 KSLC 292109
FFWSLC
UTC025-300100-
/O.NEW.KSLC.FF.W.0046.110829T2109Z-110830T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
309 PM MDT MON AUG 29 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL KANE COUNTY IN UTAH

* UNTIL 700 PM MDT

* AT 253 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN FROM A THUNDERSTORM OVER THE PARIA AND COTTONWOOD WASH  
  AREAS OF KANE COUNTY.

* OVER AN INCH OF RAINFALL HAS FALLEN OVER THE CONFLUENCE OF THE     
  THESE WASHES.  THE COMBINATION OF RAINFALL FALLING ON THESE FLASH  
  FLOOD PRONE AREAS CAUSE CONCERN FOR THOSE IN THE PARIA NARROWS     
  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 3738 11209 3748 11193 3744 11181 3723 11183
      3714 11185 3705 11185 3700 11187 3714 11202

$$

MCINERNEY
2 follow-up statements
422 
WGUS75 KSLC 292303
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
503 PM MDT MON AUG 29 2011

UTC025-300100-
/O.CON.KSLC.FF.W.0046.000000T0000Z-110830T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
503 PM MDT MON AUG 29 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM MDT FOR
CENTRAL KANE COUNTY...

HEAVY RAIN HAS ENDED OVER THE DRAINAGES OF THE PARIA RIVER AND 
COTTONWOOD CREEK OF CENTRAL KANE COUNTY...BUT RUNOFF IS EXPECTED TO 
CONTINUE UNTIL AT LEAST 7PM THIS EVENING.

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 3738 11209 3748 11193 3744 11181 3723 11183
      3714 11185 3705 11185 3700 11187 3714 11202

$$

STRUTHWOLF
035 
WGUS75 KSLC 300059
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
659 PM MDT MON AUG 29 2011

UTC025-300109-
/O.EXP.KSLC.FF.W.0046.000000T0000Z-110830T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
659 PM MDT MON AUG 29 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 700 PM MDT FOR CENTRAL KANE
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 3738 11209 3748 11193 3744 11181 3723 11183
      3714 11185 3705 11185 3700 11187 3714 11202

$$

STRUTHWOLF

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 28, 6:17 PM MDTFlash Flood WarningSLCWashington2 hr
Aug 28, 6:59 PM MDTSpecial Weather StatementSLCTooele61 min
Aug 28, 8:35 PM MDTSpecial Weather StatementSLCDavis, Salt Lake55 min
Aug 28, 10:41 PM MDTAreal Flood AdvisorySLCSalt Lake109 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.