Alert archive / Utah / Flash Flood Warnings in 2012

Flash Flood Warning 5, NWS Salt Lake City, UT

July 13, 2012Kane County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 13, 2012, 1:22 PM MDT for Kane 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: Jul 13, 2012, 1:22 PM MDT (19:22 UTC)
Expired: Jul 13, 2012, 4:15 PM MDT
In force: 3 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), 29 km from the middle of the area, began a volume at 19:24 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, 7.4 hours before the alert went out and 256 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 197 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1428 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 36 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.

245 
WGUS55 KSLC 131922
FFWSLC
UTC025-132215-
/O.NEW.KSLC.FF.W.0005.120713T1922Z-120713T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
122 PM MDT FRI JUL 13 2012

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE SHINGLE BURN SCAR IN NORTHWESTERN KANE COUNTY IN UTAH

* UNTIL 415 PM MDT

* AT 115 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
THUNDERSTORMS CAPABLE OF PRODUCING VERY HEAVY RAIN OVER THE SHINGLE 
FIRE BURN SCAR.

INTENSE RAINFALL WILL OCCUR OVER THE SHINGLE BURN SCAR IN 
NORTHWESTERN KANE COUNTY OVER THE NEXT TWO HOURS. RADAR ESTIMATES OF 
0.50 TO 0.75 INCHES OF RAIN HAVE OCCURRED WITH THIS SERIES OF 
THUNDERSTORMS AS THEY HAVE MOVED OVER AREAS SOUTH OF THE BURN SCAR. 
UP TO 0.70 INCHES IS EXPECTED OVER THE BURN SCAR. THIS AMOUNT OF 
RAINFALL IS ANTICIPATED TO PRODUCE A DEBRIS FLOW IN AREAS ADJACENT 
TO THE BURN SCAR INCLUDING ROUTE 89 BETWEEN GLENDALE AND LONG VALLEY 
JUNCTION. PEOPLE LIVING OR TRAVELING IN THIS AREA SHOULD TAKE ACTION 
TO PROVIDE FOR THEIR SAFETY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF A DEBRIS FLOW HAS OCCURRED IT IS IMPORTANT REALIZE THAT THE RUNOUT
AREA REMAINS VERY DANGEROUS. ADDITIONAL DEBRIS FLOWS MAY OCCUR WITHIN
MINUTES OF THE ORIGINAL FLOW. PLEASE REMAIN VIGILANT AND BE PREPARED
TO TAKE SWIFT ACTION.

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 3749 11261 3749 11252 3744 11255 3741 11259
      3736 11259 3742 11266

$$

KRUSE

2 follow-up statements

412 
WGUS75 KSLC 132034
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
234 PM MDT FRI JUL 13 2012

UTC025-132215-
/O.CON.KSLC.FF.W.0005.000000T0000Z-120713T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
234 PM MDT FRI JUL 13 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM MDT FOR THE 
SHINGLE FIRE BURN SCAR IN NORTHWESTERN KANE COUNTY...

HEAVY RAINFALL FROM THUNDERSTORMS HAS LARGELY ENDED FOR THE TIME 
BEING ACROSS THE SHINGLE FIRE BURN SCAR. RUNOFF CONTINUES ACROSS THE 
AREA...AND DEBRIS FLOWS REMAIN LIKELY THROUGH 415 PM MDT. THIS 
WARNING INCLUDES ROUTE 89 BETWEEN GLENDALE AND LONG VALLEY JUNCTION.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF A DEBRIS FLOW HAS OCCURRED IT IS IMPORTANT REALIZE THAT THE RUNOUT
AREA REMAINS VERY DANGEROUS. ADDITIONAL DEBRIS FLOWS MAY OCCUR WITHIN
MINUTES OF THE ORIGINAL FLOW. PLEASE REMAIN VIGILANT AND BE PREPARED
TO TAKE SWIFT ACTION.

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 3749 11261 3749 11252 3744 11255 3741 11259
      3736 11259 3742 11266

$$

KRUSE

244 
WGUS75 KSLC 132207
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
407 PM MDT FRI JUL 13 2012

UTC025-132216-
/O.EXP.KSLC.FF.W.0005.000000T0000Z-120713T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
407 PM MDT FRI JUL 13 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 415 PM MDT FOR THE SHINGLE 
FIRE BURN SCAR IN NORTHWESTERN KANE COUNTY...

RUNOFF HAS DIMINISHED ACROSS THE AREA THEREFORE THE THREAT OF A 
DEBRIS FLOW ON THE SHINGLE FIRE BURN SCAR HAS ENDED. ADDITIONAL 
MINOR FLOODING IS POSSIBLE FOR THE NEXT SEVERAL HOURS.

LAT...LON 3749 11261 3749 11252 3744 11255 3741 11259
      3736 11259 3742 11266

$$

KRUSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 7:20 PM MDT	Areal Flood Advisory	SLC	Washington	3 hr
Jul 13, 4:09 AM MDT	Flash Flood Watch	SLC		40 hr
Jul 13, 4:47 PM MDT	Special Weather Statement	SLC	Juab, Sanpete, Tooele, Utah	43 min

Nearby

Flash Flood Warnings in Utah, 2012 Every flash flood warning in 2012

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.