Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 47, NWS Salt Lake City, UT

August 30, 2011Wayne County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 30, 2011, 1:35 PM MDT for 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: Aug 30, 2011, 1:35 PM MDT (19:35 UTC)
Expired: Aug 30, 2011, 4:30 PM MDT
In force: 3 hr
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Flood severity: None

County Wayne County, UT

The radar

The Cedar City radar (KICX), 166 km from the middle of the area, began a volume at 19:38 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, 7.6 hours before the alert went out and 251 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: 13 J/kg
Mixed-layer CIN: -252 J/kg
Mixed-layer LCL: 2040 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 137 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.

629 
WGUS55 KSLC 301935
FFWSLC
UTC055-302230-
/O.NEW.KSLC.FF.W.0047.110830T1935Z-110830T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
135 PM MDT TUE AUG 30 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL WAYNE COUNTY IN UTAH

* UNTIL 430 PM MDT

* AT 127 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN FROM A THUNDERSTORM OVER PLEASANT CREEK IN CAPITOL REEF 
  NATIONAL PARK. THIS WATER IS EXPECTED TO FLOW UP PLEASANT CREEK    
  UNTIL IT REACHES THE FREMONT RIVER...THEN UP THE FREMONT RIVER     
  THROUGH THE TOWN OF CAINEVILLE. WATER MAY ALSO FLOW OVER THE NOTOM 
  ROAD. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CAPITOL    
  REEF NATIONAL PARK AND CAINEVILLE

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 3815 11115 3816 11125 3818 11129 3834 11102
      3833 11098

$$

SCHOENING

2 follow-up statements

061 
WGUS75 KSLC 302115
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
315 PM MDT TUE AUG 30 2011

UTC055-302230-
/O.CON.KSLC.FF.W.0047.000000T0000Z-110830T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
315 PM MDT TUE AUG 30 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM MDT FOR SOUTH
CENTRAL WAYNE COUNTY...

AT 307 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE FLASH FLOODING OVER PLEASANT CREEK IN AND AROUND CAPITOL 
REEF NATIONAL PARK. THIS WATER IS EXPECTED TO FLOW DOWN PLEASANT 
CREEK UNTIL IT REACHES THE FREMONT RIVER...THEN DOWN THE FREMONT 
RIVER THROUGH THE TOWN OF CAINEVILLE. WATER MAY ALSO FLOW OVER THE 
NOTOM ROAD. 

THUNDERSTORMS CONTINUE TO FORM OVER THIS AREA THIS 
AFTERNOON...ADDING MORE WATER TO THE CREEKS...RIVERS...AND OTHER 
WASHES IN THIS AREA. RADAR INDICATES THAT AS MUCH AS 2 INCHES OF 
PRECIPITATION HAS ALREADY FALLEN OVER PARTS OF THIS AREA AS OF 300 
PM...WITH MORE RAIN POSSIBLE THROUGHOUT THE REST OF THIS AFTERNOON. 

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 3815 11115 3816 11125 3818 11129 3834 11102
      3833 11098

$$

SCHOENING

582 
WGUS75 KSLC 302229
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
429 PM MDT TUE AUG 30 2011

UTC055-302231-
/O.EXP.KSLC.FF.W.0047.000000T0000Z-110830T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
429 PM MDT TUE AUG 30 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 430 PM MDT FOR SOUTH
CENTRAL WAYNE COUNTY...

THIS WARNING WAS FOR PLEASANT CREEK AND THE FREMONT RIVER...FROM 
CAPITOL REEF NATIONAL PARK TO CAINEVILLE. LITTLE ADDITIONAL 
PRECIPITATION IS EXPECTED OVER THE AREA THIS AFTERNOON...SO THE 
WARNING WILL BE ALLOWED TO EXPIRE. HOWEVER...MANY CREEKS AND WASHES 
WILL CONTINUE TO RUN HIGHER THAN NORMAL INTO THE EVENING HOURS...AND 
INCREASED FLOWS ARE STILL EXPECTED ON THE FREMONT RIVER THROUGH 
TODAY.

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 3815 11115 3816 11125 3818 11129 3834 11102
      3833 11098

$$

SCHOENING

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 3:19 AM MDT	Red Flag Warning	SLC		65 hr
Aug 30, 3:20 PM MDT	Fire Weather Watch	SLC		23 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.