Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 48, NWS Salt Lake City, UT

September 9, 2011Kane County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Sep 9, 2011, 4:16 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 9, 2011, 4:16 PM MDT (22:16 UTC)
Expired
Sep 9, 2011, 8:15 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), 61 km from the middle of the area, began a volume at 22:16 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, 10.3 hours before the alert went out and 224 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 2011-09-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 567 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 2011-09-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 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
567 J/kg
Mixed-layer CIN
-117 J/kg
Mixed-layer LCL
1390 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
83 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

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

195 
WGUS55 KSLC 092216
FFWSLC
UTC025-100215-
/O.NEW.KSLC.FF.W.0048.110909T2216Z-110910T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
416 PM MDT FRI SEP 9 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

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

* UNTIL 815 PM MDT

* AT 408 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN FROM A THUNDERSTORM MOVING SOUTH THROUGH JOHNSON        
  CANYON. FLASH FLOODING IS LIKELY OCCUR NOW THROUGH THE NORTH       
  END OF THE CANYON. FLASH FLOODING WILL MOVE DOWN THE LENGTH OF     
  THE CANYON TO THE CROSSING WITH HIGHWAY 89 EAST OF KANAB.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AND NORMALLY DRY WASHES...AS
WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.

&&

LAT...LON 3731 11250 3731 11234 3714 11236 3702 11235
      3702 11237

$$

CONGER
2 follow-up statements
427 
WGUS75 KSLC 100054
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
654 PM MDT FRI SEP 9 2011

UTC025-100215-
/O.CON.KSLC.FF.W.0048.000000T0000Z-110910T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
654 PM MDT FRI SEP 9 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM MDT FOR WEST
CENTRAL KANE COUNTY...

AT 652 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES 
THAT THE HEAVY RAIN PRODUCING THUNDERSTORMS HAVE DISSIPATED ACROSS 
THE WARNED AREA. HEAVY RUNOFF IS LIKELY OCCURRING IN PORTIONS OF 
JOHNSON CANYON EARLY THIS EVENING. THIS HEAVY RUNOFF WILL DIMINISH 
AS IT APPROACHES HIGHWAY 89 THIS EVENING. 


LAT...LON 3731 11250 3731 11234 3714 11236 3702 11235
      3702 11237

$$

CONGER
737 
WGUS75 KSLC 100219
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
819 PM MDT FRI SEP 9 2011

UTC025-100226-
/O.EXP.KSLC.FF.W.0048.000000T0000Z-110910T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
819 PM MDT FRI SEP 9 2011

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

RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED THROUGH JOHNSON 
CANYON IN WESTERN KANE COUNTY. NO ADDITIONAL THUNDERSTORMS ARE 
EXPECTED IN THE WARNED THIS EVENING...THEREFORE THE FLASH FLOOD 
WARNING WILL BE ALLOWED TO EXPIRE. MONITOR NOAA WEATHER RADIO OR 
LOCAL TELEVISION OR RADIO FOR THE LATEST WEATHER INFORMATION.

LAT...LON 3731 11250 3731 11234 3714 11236 3702 11235
      3702 11237

$$

CONGER

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 9, 4:54 PM MDTFlash Flood WarningSLCWashington3 hr

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.