Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 57, NWS Salt Lake City, UT

September 16, 2011Kane County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Sep 16, 2011, 3:53 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
Sep 16, 2011, 3:53 PM MDT (21:53 UTC)
Expired
Sep 16, 2011, 7:45 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), 108 km from the middle of the area, began a volume at 21:53 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, 9.9 hours before the alert went out and 215 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 2011-09-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 459 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 2011-09-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 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
459 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
763 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
101 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.

910 
WGUS55 KSLC 162153
FFWSLC
UTC025-170145-
/O.NEW.KSLC.FF.W.0057.110916T2153Z-110917T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
353 PM MDT FRI SEP 16 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

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

* UNTIL 745 PM MDT

* AT 348 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
HEAVY RAIN FROM A THUNDERSTORM OVER THE WAHWEEP DRAINAGE NORTH OF 
THE TOWN OF BIG WATER.  THIS DRAINAGE FLOWS SOUTH PAST BIG WATER AND 
THEN TERMINATES INTO LAKE POWELL.

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 3726 11190 3721 11170 3720 11164 3704 11156
      3705 11180 3711 11185

$$

MCINERNEY
2 follow-up statements
796 
WGUS75 KSLC 162359
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
559 PM MDT FRI SEP 16 2011

UTC025-170145-
/O.CON.KSLC.FF.W.0057.000000T0000Z-110917T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
559 PM MDT FRI SEP 16 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM MDT FOR SOUTH
CENTRAL KANE COUNTY...

AT 549 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT OVER ONE INCH OF RAIN HAS FALLEN FROM A THUNDERSTORM IN THE 
WAHWEAP DRAINAGE NORTH OF THE TOWN OF BIG WATER. 

RUNOFF FROM THIS THUNDERSTORM WILL CONTINUE TO RESULT IN HIGH FLOWS 
ALONG THE WAHWEAP DRAINAGE...WHICH FLOWS SOUTH PAST BIG WATER BEFORE 
TERMINATING INTO LAKE POWELL.

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 3726 11190 3721 11170 3720 11164 3704 11156
      3705 11180 3711 11185

$$

LC
002 
WGUS75 KSLC 170151
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
751 PM MDT FRI SEP 16 2011

UTC025-170200-
/O.EXP.KSLC.FF.W.0057.000000T0000Z-110917T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
751 PM MDT FRI SEP 16 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR SOUTH CENTRAL KANE
COUNTY...

RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED GREATLY AND FLOWS 
IN AREA CANYONS AND STREAMS HAVE DECREASED. 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 3726 11190 3721 11170 3720 11164 3704 11156
      3705 11180 3711 11185

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 16, 3:08 PM MDTFlash Flood WarningSLCWashington3 hr
Sep 16, 3:13 PM MDTSevere Thunderstorm WarningSLCGarfield, Wayne62 min
Sep 16, 3:33 PM MDTFlash Flood WarningSLCKane, Washington3 hr
Sep 16, 3:44 PM MDTSevere Thunderstorm WarningSLCEmery, Wayne33 min
Sep 16, 3:54 PM MDTFlash Flood WarningSLCEmery3 hr
Sep 16, 4:21 PM MDTSevere Thunderstorm WarningSLCWayne38 min
Sep 16, 4:39 PM MDTSevere Thunderstorm WarningSLCGarfield50 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.