Alert archive / Utah / Flash Flood Warnings in 2013

Flash Flood Warning 13, NWS Salt Lake City, UT

July 16, 2013Carbon County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 16, 2013, 7:27 PM MDT for Carbon County, Utah. It was in force for 78 min. 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 16, 2013, 7:27 PM MDT (01:27 UTC)
Expired: Jul 16, 2013, 8:45 PM MDT
In force: 78 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Flood severity: None

County Carbon County, UT

The radar

The Salt Lake City radar (KMTX), 215 km from the middle of the area, began a volume at 01:29 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

Salt Lake City I, UT (KSLC), launched 00:00Z, 1.5 hours before the alert went out and 145 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: 280 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 2730 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 92 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.

577 
WGUS55 KSLC 170127
FFWSLC
UTC007-170245-
/O.NEW.KSLC.FF.W.0013.130717T0127Z-130717T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
727 PM MDT TUE JUL 16 2013

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

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

* UNTIL 845 PM MDT

* AT 718 PM MDT...DOPPLER RADAR INDICATED THAT HEAVY RAINFALL HAS    
  BEEN FALLING OVER THE NORTHEAST QUADRANT OF THE SEELEY BURN 
SCAR.     THIS RAINFALL EVENT IS THE SECOND TO HIT THE BURN SCAR 
THIS          EVENING. 

  RADAR ESTIMATES INDICATE THAT 0.75 TO 1.0 INCHES OF RAINFALL IN AN 
  HOUR. 

  IT IS EXPECTED THAT THIS AMOUNT OF RAINFALL WILL RESULT IN FLASH   
  FLOODING AND A DEBRIS FLOW WHICH WILL IMPACT THE AREAS TO THE EAST 
  OF THE BURN SCAR.  THAT ANTICIPATED FLASH FLOOD AND DEBRIS FLOW    
  WILL TERMINATE IN THE PRICE RIVER.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO COAL CITY

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 3970 11114 3971 11103 3971 11095 3962 11082
      3957 11102 3958 11112

$$

MCINERNEY

2 follow-up statements

399 
WGUS75 KSLC 170206
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
806 PM MDT TUE JUL 16 2013

UTC007-170245-
/O.CON.KSLC.FF.W.0013.000000T0000Z-130717T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CARBON UT-
806 PM MDT TUE JUL 16 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM MDT FOR WEST
CENTRAL CARBON COUNTY...

AT 800 PM MDT...WHILE THUNDERSTORM ACTIVITY OVER THE NORTHEAST 
QUADRANT OF THE SEELEY BURN SCAR HAS DIMINISHED...THE AREA RECEIVED 
OVER AN INCH OF RAINFALL.  

TYPICALLY...THIS BURN SCAR HAS PRODUCED DEBRIS FLOWS WITH 0.50 
INCHES IN UNDER AN HOUR.  WE HAVE NOT YET RECEIVED ANY REPORTS OF 
FLOODING ON THIS SECTION...BUT BELIEVE A DEBRIS FLOW IS MOVING 
TOWARDS THE PRICE RIVER NEAR COAL CITY DUE TO THE INTENSE RAINFALL.

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 3970 11114 3971 11103 3971 11095 3962 11082
      3957 11102 3958 11112

$$

MCINERNEY

328 
WGUS75 KSLC 170241
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
841 PM MDT TUE JUL 16 2013

UTC007-170250-
/O.EXP.KSLC.FF.W.0013.000000T0000Z-130717T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CARBON UT-
841 PM MDT TUE JUL 16 2013

...THE FLASH FLOOD WARNING WILL EXPIRE AT 845 PM MDT FOR WEST CENTRAL
CARBON COUNTY...

RAINFALL OVER THE NORTHEAST QUADRANT OF THE SEELEY BURN SCAR HAS 
DIMINISHED.  AS SUCH IT IS INFERRED THAT THE FLASH FLOOD THAT FLOWED 
EAST HAS TERMINATED IN THE PRICE RIVER.  

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 3970 11114 3971 11103 3971 11095 3962 11082
      3957 11102 3958 11112

$$

MCINERNEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 6:18 PM MDT	Areal Flood Advisory	SLC	Tooele	117 min
Jul 16, 6:53 PM MDT	Flash Flood Warning	SLC	Utah	3 hr
Jul 16, 7:11 PM MDT	Areal Flood Advisory	SLC	Salt Lake	2 hr
Jul 17, 1:33 PM MDT	Flash Flood Warning	SLC	Carbon, Emery	3 hr
Jul 17, 4:54 PM MDT	Flash Flood Warning	SLC	Wayne	3 hr

Nearby

Flash Flood Warnings in Utah, 2013 Every flash flood warning in 2013

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.