Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 19, NWS Salt Lake City, UT

July 31, 2011Wayne County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 31, 2011, 5:52 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: Jul 31, 2011, 5:52 PM MDT (23:52 UTC)
Expired: Jul 31, 2011, 8:45 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), 161 km from the middle of the area, began a volume at 23:55 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, 11.9 hours before the alert went out and 258 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2107 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -52 m²/s²
0-3 km storm-relative helicity: 39 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.

532 
WGUS55 KSLC 312352
FFWSLC
UTC055-010245-
/O.NEW.KSLC.FF.W.0019.110731T2352Z-110801T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
552 PM MDT SUN JUL 31 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL WAYNE COUNTY IN UTAH...
  CAPITOL REEF NATIONAL PARK...

* UNTIL 845 PM MDT

* AT 542 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
THUNDERSTORMS CAPABLE OF PRODUCING FLASH FLOODING OVER THE SULFUR 
AND SPRING CREEKS AREA OF CAPITOL REEF NATIONAL PARK.

* UP TO 1.50 TO 2 INCHES OF RAIN HAS FALLEN IN THIS AREA ACCORDING 
TO RADAR ESTIMATES. FLASH FLOODING IS EXPECTED ALONG THESE CREEKS.


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 3846 11137 3840 11118 3824 11123 3831 11144

$$

STRUTHWOLF

2 follow-up statements

945 
WGUS75 KSLC 010113
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
713 PM MDT SUN JUL 31 2011

UTC055-010245-
/O.CON.KSLC.FF.W.0019.000000T0000Z-110801T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
713 PM MDT SUN JUL 31 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM MDT FOR 
CENTRAL WAYNE COUNTY INCLUDING THE NORTHERN PORTION OF CAPITOL REEF 
NATIONAL PARK...

AT 659 PM MDT...RADAR ESTIMATES OF ABOUT 1.50 INCHES OF RAIN 
OCCURRED OVER DEEP AND BULLBERRY CREEKS OF NORTHERN CAPITOL REEF 
NATIONAL PARK LATE THIS AFTERNOON. SHOWERS ARE EXPECTED TO CONTINUE 
HERE FOR ANOTHER COUPLE OF HOURS SO THE THREAT OF FLASH FLOODING ON 
THESE CREEKS AND SURROUNDING WASHES REMAINS.

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 3846 11137 3840 11118 3824 11123 3831 11144

$$

STRUTHWOLF

967 
WGUS75 KSLC 010238
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
838 PM MDT SUN JUL 31 2011

UTC055-010246-
/O.EXP.KSLC.FF.W.0019.000000T0000Z-110801T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
838 PM MDT SUN JUL 31 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 845 PM MDT FOR CENTRAL 
WAYNE COUNTY AND THE NORTHERN PORTION OF CAPITOL REEF NATIONAL 
PARK...

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 3846 11137 3840 11118 3824 11123 3831 11144

$$

STRUTHWOLF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 4:04 AM MDT	Flash Flood Watch	SLC		17 hr
Jul 31, 1:43 PM MDT	Areal Flood Advisory	SLC	Kane, Washington	3 hr
Jul 31, 3:45 PM MDT	Areal Flood Advisory	SLC	Beaver, Iron	3 hr
Jul 31, 4:02 PM MDT	Special Weather Statement	SLC	Garfield	43 min
Jul 31, 4:49 PM MDT	Flash Flood Warning	SLC	Garfield	6 hr
Jul 31, 5:12 PM MDT	Flash Flood Warning	SLC	Washington	3 hr
Jul 31, 5:53 PM MDT	Areal Flood Advisory	SLC	Kane, Washington	3 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.