Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 59, NWS Salt Lake City, UT

September 17, 2011Garfield County, Wayne County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Sep 17, 2011, 5:25 PM MDT for Garfield County, Wayne 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: Sep 17, 2011, 5:25 PM MDT (23:25 UTC)
Expired: Sep 17, 2011, 8:15 PM MDT
In force: 3 hr
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Flood severity: None

Counties Garfield County, UT, Wayne County, UT

The radar

The Cedar City radar (KICX), 188 km from the middle of the area, began a volume at 23:26 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

Grand Junction, CO (KGJT), launched 12:00Z, 11.4 hours before the alert went out and 229 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: 131 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 766 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 131 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.

928 
WGUS55 KSLC 172325
FFWSLC
UTC017-055-180215-
/O.NEW.KSLC.FF.W.0059.110917T2325Z-110918T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
525 PM MDT SAT SEP 17 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL GARFIELD COUNTY IN UTAH
  CENTRAL WAYNE COUNTY IN UTAH

* UNTIL 815 PM MDT

* AT 513 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN FROM A THUNDERSTORM OVER THE HENRY MOUNTAINS.

* RUNOFF FROM THE HEAVY RAIN WILL CAUSE FLASH FLOODING ON WASHES AND 
  STREAMS NORTH OF THE HENRY MOUNTAINS...INCLUDING BUT NOT LIMITED 
  TO SWEETWATER AND CEDAR CREEK AND TOWN WASH. THIS WATER WILL THEN 
  FLOW INTO THE FREMONT RIVER WEST OF HANKSVILLE.

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 3818 11103 3838 11095 3840 11068 3835 11068
      3834 11083 3828 11090 3812 11089 3807 11076
      3798 11078 3806 11100

$$

LC

2 follow-up statements

306 
WGUS75 KSLC 180111
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
711 PM MDT SAT SEP 17 2011

UTC017-055-180215-
/O.CON.KSLC.FF.W.0059.000000T0000Z-110918T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-WAYNE UT-
711 PM MDT SAT SEP 17 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM MDT FOR
CENTRAL WAYNE AND NORTH CENTRAL GARFIELD COUNTIES...

AT 704 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
OVER TWO INCHES OF WATER FELL OVER THE HENRY MOUNTAINS. RUNOFF FROM 
THIS HEAVY RAIN WILL CONTINUE TO PRODUCE HIGH FLOWS ALONG NORMALLY 
DRY WASHES AND SMALL STREAMS NORTH OF THE HENRY MOUNTAINS. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SWEETWATER 
AND CEDAR CREEKS AND TOWN WASH. WATER FROM THESE DRAINAGES WILL 
THEN FLOW INTO THE FREMONT RIVER WEST OF HANKSVILLE.

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 3818 11103 3838 11095 3840 11068 3835 11068
      3834 11083 3828 11090 3812 11089 3807 11076
      3798 11078 3806 11100

$$

LC

044 
WGUS75 KSLC 180209
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
809 PM MDT SAT SEP 17 2011

UTC017-055-180217-
/O.EXP.KSLC.FF.W.0059.000000T0000Z-110918T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-WAYNE UT-
809 PM MDT SAT SEP 17 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 815 PM MDT FOR CENTRAL
WAYNE AND NORTH CENTRAL GARFIELD COUNTIES...

HEAVY RAIN HAS ENDED AND ANY REMAINING RUNOFF ALONG SWEETWATER AND 
CEDAR CREEKS...TOWN WASH...AND OTHER ADJACENT DRAINAGES WILL 
CONTINUE TO FLOW INTO THE FREMONT RIVER WEST OF HANKSVILLE THROUGH 
LATE THIS EVENING.

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 3818 11103 3838 11095 3840 11068 3835 11068
      3834 11083 3828 11090 3812 11089 3807 11076
      3798 11078 3806 11100

$$

LC

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 16, 7:42 PM MDT	Severe Thunderstorm Warning	SLC	Washington	48 min
Sep 16, 8:02 PM MDT	Severe Thunderstorm Warning	SLC	Washington	43 min
Sep 16, 8:10 PM MDT	Tornado Warning	SLC	Washington	20 min
Sep 16, 9:27 PM MDT	Severe Thunderstorm Warning	SLC	Iron, Washington	38 min
Sep 17, 9:01 AM MDT	Areal Flood Advisory	SLC	Emery, Sevier, Wayne	4 hr

Nearby

Flash Flood Warnings in Utah, 2011 Every 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.