Alert archive / Utah / Flash Flood Warnings in 2015

Flash Flood Warning 49, NWS Salt Lake City, UT

August 11, 2015Kane County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 11, 2015, 5:35 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 11, 2015, 5:35 PM MDT (23:35 UTC)
Expired
Aug 11, 2015, 9:30 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), 52 km from the middle of the area, began a volume at 23:35 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, 11.6 hours before the alert went out and 230 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 2015-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 413 joules per kilogram.LCLLFCEL10008507005003002001001 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 2015-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 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
413 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
1330 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
87 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.

601 
WGUS55 KSLC 112339
FFWSLC
UTC025-120330-
/O.NEW.KSLC.FF.W.0049.150811T2335Z-150812T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
535 PM MDT TUE AUG 11 2015

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

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

* UNTIL 930 PM MDT

* AT 535 PM MDT...DOPPLER RADAR INDICATED OVER AN INCH OF RAINFALL 
  HAS FALLEN OVER THE UPPER DRAINAGE OF KANAB CREEK.  THIS AMOUNT OF 
  PRECIPITATION IS EXPECTED TO PRODUCE FLASH FLOODING ALONG THE 
  CREEK. KANAB CREEK FLOWS SOUTH NEAR THE TOWN OF KANAB.
  
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  KANAB AND GLENDALE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ANTICIPATE BEING IN THIS DRAINAGE UNTIL THE LATE HOURS
...PLEASE TAKE CARE AND BE AWARE OF HIGH WATER.

&&

LAT...LON 3738 11239 3700 11250 3700 11259 3735 11261

$$

MCINERNEY
2 follow-up statements
133 
WGUS75 KSLC 120141
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
737 PM MDT TUE AUG 11 2015

UTC025-120330-
/O.CON.KSLC.FF.W.0049.000000T0000Z-150812T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
737 PM MDT TUE AUG 11 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM MDT FOR
SOUTHWESTERN KANE COUNTY...

AT 737 PM MDT...RAINFALL OVER THE UPPER DRAINAGES OF KANAB CREEK HAS 
DIMINISHED.  HOWEVER...IT IS INFERRED THAT IT WILL REQUIRE 
ADDITIONAL TIME FOR THE STREAM TO DEWATER TO SAFE LEVELS.  

OVER AN INCH OF RAINFALL HAD FALLEN OVER A WIDE SWATCH OF HEADWATER 
STREAMS OF THE KANAB CREEK DRAINAGE EARLIER THIS EVENING. AS A 
RESULT...HIGH FLOWS ARE NOW COURSING THROUGH THE DRAINAGE TO THE 
SOUTH.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
KANAB AND GLENDALE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE NEAR THE BANKS OF KANAB CREEK THROUGH THE NIGHTTIME 
HOURS...PLEASE TAKE CARE AND WATCH FOR HIGH WATER.

&&

LAT...LON 3738 11239 3700 11250 3700 11259 3735 11261

$$

MCINERNEY
900 
WGUS75 KSLC 120326
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
926 PM MDT TUE AUG 11 2015

UTC025-120334-
/O.EXP.KSLC.FF.W.0049.000000T0000Z-150812T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
926 PM MDT TUE AUG 11 2015

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN KANE COUNTY WILL EXPIRE
AT 930 PM MDT...

RUNOFF FROM EARLIER PRECIPITATION OVER THE UPPER DRAINAGES OF KANAB 
CREEK HAS DIMINISHED AND RIVER AND STREAM LEVELS WILL CONTINUE TO 
DECREASE THROUGH THE REMAINDER OF THE EVENING. THEREFORE...THE FLASH 
FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE. MONITOR NOAA WEATHER RADIO 
OR LOCAL TELEVISION OR RADIO FOR THE LATEST WEATHER INFORMATION.

LAT...LON 3738 11239 3700 11250 3700 11259 3735 11261

$$

LC

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 11, 2:44 PM MDTSpecial Weather StatementSLCTooele61 min
Aug 11, 3:46 PM MDTSpecial Weather StatementSLCTooele59 min
Aug 11, 4:18 PM MDTFlash Flood WarningSLCTooele3 hr
Aug 11, 5:20 PM MDTSpecial Weather StatementSLCCache, Davis, Morgan, Rich, Salt Lake, Weber40 min
Aug 11, 5:25 PM MDTSpecial Weather StatementSLCDavis, Salt Lake, Weber50 min
Aug 11, 5:55 PM MDTSpecial Weather StatementSLCDavis, Weber50 min

Nearby

Flash Flood Warnings in Utah, 2015Every flash flood warning in 2015

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.