Alert archive / Utah / Flash Flood Warnings in 2012

Flash Flood Warning 60, NWS Salt Lake City, UT

August 24, 2012Kane County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 24, 2012, 4:20 PM MDT for Kane County, Utah. It was in force for 6 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 24, 2012, 4:20 PM MDT (22:20 UTC)
Expired: Aug 24, 2012, 10:15 PM MDT
In force: 6 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), 95 km from the middle of the area, began a volume at 22:23 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.

What was reported inside it

Time	Report	Where	Remark
Aug 24, 7:00 PM MDT	FLASH FLOOD	19 W Big Water, UT	FLASH FLOOD ALONG BUCKSKIN GULCH WASHED OUT HOUSE ROCK VALLEY ROAD, MAKING IT IMPOSSIBLE TO REACH THE WAVE, A VERY POPULAR HIKE IN THE AREA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 10.3 hours before the alert went out and 212 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: 1 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 748 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 81 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.

508 
WGUS55 KSLC 242220
FFWSLC
UTC025-250415-
/O.NEW.KSLC.FF.W.0060.120824T2220Z-120825T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
420 PM MDT FRI AUG 24 2012

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

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

* UNTIL 1015 PM MDT

* AT 415 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN FROM A THUNDERSTORM OVER THE BUCKSKIN GULCH AND WAHWEEP 
  CREEK DRAINAGES. 

* RAINFALL AMOUNTS OF 1 TO 2 INCHES HAS FALLEN OVER THE HEADWATER 
  REGIONS OF THESE DRAINAGES.  IT IS INFERRED THAT WITH THIS         
  WIDESPREAD AMOUNT OF RAIN FALLING...FLASH FLOODING IS              
  ANTICIPATED THROUGH THE EVENING HOURS.

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 3698 11175 3699 11210 3735 11236 3748 11206
      3700 11173

$$

SCHOENING

3 follow-up statements

471 
WGUS55 KSLC 242222 CCA
FFWSLC
UTC025-250415-
/O.COR.KSLC.FF.W.0060.120824T2220Z-120825T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
420 PM MDT FRI AUG 24 2012

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

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

* UNTIL 1015 PM MDT

* AT 415 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN FROM A THUNDERSTORM OVER THE BUCKSKIN GULCH AND PARIA   
  RIVER DRAINAGES. 

* RAINFALL AMOUNTS OF 1 TO 2 INCHES HAS FALLEN OVER THE HEADWATER 
  REGIONS OF THESE DRAINAGES.  IT IS INFERRED THAT WITH THIS         
  WIDESPREAD AMOUNT OF RAIN FALLING...FLASH FLOODING IS              
  ANTICIPATED THROUGH THE EVENING HOURS.

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 3698 11175 3699 11210 3735 11236 3748 11206
      3700 11173

$$

SCHOENING

969 
WGUS75 KSLC 250117
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
717 PM MDT FRI AUG 24 2012

UTC025-250415-
/O.CON.KSLC.FF.W.0060.000000T0000Z-120825T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
717 PM MDT FRI AUG 24 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 PM MDT FOR
CENTRAL KANE COUNTY...

AT 710 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE FLASH FLOODING OVER THE BUCKSKIN GULCH AND PARIA RIVER. 
HALF AN INCH TO AN INCH OF RAIN HAS FALLEN OVER A WIDE AREA...AND AS 
MUCH AS 2.5 INCHES OF WATER HAS FALLEN OVER THE HEADWATERS OF 
BUCKSKIN GULCH. THIS WATER WILL CONTINUE TO FLOW SOUTH TO THE 
UTAH/ARIZONA BORDER THROUGH THE EVENING...LIKELY RESULTING IN 
DANGEROUSLY HIGH FLOWS ACROSS THE BUCKSKIN GULCH AND PARIA RIVER.


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 3698 11175 3699 11210 3735 11236 3748 11206
      3700 11173

$$

SCHOENING

277 
WGUS75 KSLC 250406
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1006 PM MDT FRI AUG 24 2012

UTC025-250416-
/O.EXP.KSLC.FF.W.0060.000000T0000Z-120825T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
1006 PM MDT FRI AUG 24 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1015 PM MDT FOR CENTRAL
KANE COUNTY...

RAINFALL HAS STOPPED OVER THE PARIA RIVER AND BUCKSKIN GULCH THIS 
EVENING...AND NO FURTHER RAINFALL IS EXPECTED...SO THE FLASH FLOOD 
WARNING WILL BE ALLOWED TO EXPIRE. HOWEVER...DANGEROUSLY HIGH WATER 
LEVELS COULD STILL CONTINUE IN THIS AREA THROUGH THE OVERNIGHT 
HOURS...AS PRIOR RAINFALL CONTINUES TO FLOW SOUTHWARD. 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 3698 11175 3699 11210 3735 11236 3748 11206
      3700 11173

$$

SCHOENING

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 2:15 PM MDT	Special Weather Statement	SLC	Utah	45 min
Aug 24, 2:38 PM MDT	Special Weather Statement	SLC	Carbon	52 min
Aug 24, 4:01 PM MDT	Special Weather Statement	SLC	Carbon	44 min
Aug 24, 5:25 PM MDT	Severe Thunderstorm Warning	SLC	Emery	50 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.