Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 9, NWS Salt Lake City, UT

July 19, 2011Wayne County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 19, 2011, 12:33 PM MDT for Wayne County, Utah. It was in force for 3 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: Jul 19, 2011, 12:33 PM MDT (18:33 UTC)
Expired: Jul 19, 2011, 3:30 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), 160 km from the middle of the area, began a volume at 18:35 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
Jul 19, 12:41 PM MDT	FLASH FLOOD	2 Sw Capitol Reef Np, UT	FLOODING REPORTED IN CAPITOL REEF NATIONAL PARK. SCENIC DRIVE WAS CLOSED, WITH SIX TO EIGHT INCHES OF WATER FLOWING OVER THE ROAD. GRAND WASH EXPERIENCED FLASH FLOODING, WHICH ALSO IMPACTED SCENIC DRIVE. SULPHUR CREEK ALSO EXPERIENCED FLASH FLOODING.

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

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 6.6 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: 16 J/kg
Mixed-layer CIN: -180 J/kg
Mixed-layer LCL: 1696 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -34 m²/s²
0-3 km storm-relative helicity: -6 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.

700 
WGUS55 KSLC 191833
FFWSLC
UTC055-192130-
/O.NEW.KSLC.FF.W.0009.110719T1833Z-110719T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1233 PM MDT TUE JUL 19 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL WAYNE COUNTY IN UTAH...
  THIS INCLUDES CAPITOL REEF NATIONAL PARK...SPECIFICALLY GRAND WASH 
  AND PORTIONS OF SCENIC DRIVE NEAR THE MOUTH OF GRAND WASH...

* UNTIL 330 PM MDT

* AT 1221 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR        
INDICATED HEAVY RAIN CAPABLE OF PRODUCING FLASH FLOODING FROM A 
THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FRUITA.

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 3830 11127 3829 11121 3828 11116 3824 11123
      3820 11127 3821 11134

$$

HOSENFELD

2 follow-up statements

941 
WGUS75 KSLC 192028
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
228 PM MDT TUE JUL 19 2011

UTC055-192130-
/O.CON.KSLC.FF.W.0009.000000T0000Z-110719T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
228 PM MDT TUE JUL 19 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 PM MDT FOR 
CENTRAL WAYNE COUNTY. THIS INCLUDES CAPITOL REEF NATIONAL 
PARK...SPECIFICALLY GRAND WASH AND PORTIONS OF SCENIC DRIVE...

AT 100 PM MDT...RANGERS AT CAPITOL REEF REPORTED THAT FLASH FLOODING 
HAS CLOSED SCENIC DRIVE. BOTH SULPHUR CREEK AND GRAND WASH HAD 
EXPERIENCED FLASH FLOODING. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CAPITOL REEF 
NATIONAL PARK.

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 3830 11127 3829 11121 3828 11116 3824 11123
      3820 11127 3821 11134

$$

HOSENFELD

932 
WGUS75 KSLC 192124
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
324 PM MDT TUE JUL 19 2011

UTC055-192134-
/O.EXP.KSLC.FF.W.0009.000000T0000Z-110719T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
324 PM MDT TUE JUL 19 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 330 PM MDT FOR CENTRAL
WAYNE COUNTY...

RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED GREATLY AND 
THEREFORE... THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE. 
MONITOR NOAA WEATHER RADIO OR LOCAL TELEVISION OR RADIO FOR THE 
LATEST WEATHER INFORMATION.

LAT...LON 3830 11127 3829 11121 3828 11116 3824 11123
      3820 11127 3821 11134

$$

SEAMAN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 6:27 PM MDT	Special Weather Statement	SLC	Kane	48 min
Jul 19, 2:27 AM MDT	Red Flag Warning	SLC		20 hr
Jul 19, 2:45 AM MDT	Wind Advisory	SLC		18 hr
Jul 19, 1:46 PM MDT	Flash Flood Warning	SLC	Carbon	3 hr
Jul 19, 3:17 PM MDT	Special Weather Statement	SLC	Salt Lake	43 min
Jul 19, 3:31 PM MDT	Areal Flood Advisory	SLC	Salt Lake	59 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.