Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 15, NWS Salt Lake City, UT

July 27, 2011Garfield County, Wayne County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 27, 2011, 3:13 PM MDT for Garfield County, 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 27, 2011, 3:13 PM MDT (21:13 UTC)
Expired: Jul 27, 2011, 6:15 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), 173 km from the middle of the area, began a volume at 21:15 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 27, 5:02 PM MDT	FLASH FLOOD	12 S Hanksville, UT	VERY LARGE FLASH FLOOD FROM MULTIPLE DRAINAGES IN THE HENRY MOUNTAINS. DAMAGE TO SR 95 AND SR24.

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, 9.2 hours before the alert went out and 246 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: 1072 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 57 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.

738 
WGUS55 KSLC 272113
FFWSLC
UTC017-055-280015-
/O.NEW.KSLC.FF.W.0015.110727T2113Z-110728T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
313 PM MDT WED JUL 27 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL GARFIELD COUNTY IN UTAH...
  SOUTH CENTRAL WAYNE COUNTY IN UTAH...
  CENTRAL AND SOUTHERN CAPITOL REEF NATIONAL PARK AND 
  DRAINAGES TO THE EAST

* UNTIL 615 PM MDT

* AT 306 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN FROM A THUNDERSTORM OVER THE WARNED AREA.

* RAINFALL OVER ONE INCH HAS OCCURRED OVER SOUTHERN CAPITOL REEF AND 
  DRAINAGES TO THE EAST...INCLUDING NOTOM ROAD AND OTHER SECONDARY   
  ROADS IN THE VICINITY.

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 11117 3834 11102 3837 11074 3816 11065
      3774 11082 3775 11097 3782 11108 3796 11117

$$

ALCOTT/MCINERNEY

2 follow-up statements

827 
WGUS75 KSLC 272305
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
505 PM MDT WED JUL 27 2011

UTC017-055-280015-
/O.CON.KSLC.FF.W.0015.000000T0000Z-110728T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-WAYNE UT-
505 PM MDT WED JUL 27 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM MDT FOR SOUTH
CENTRAL WAYNE AND CENTRAL GARFIELD COUNTIES...

AT 454 PM MDT...RUNOFF FROM EARLIER HEAVY RAIN WILL CONTINUE TO 
RESULT IN HIGH WATERS IN PORTIONS OF CAPITOL REEF NATIONAL PARK.

LOCATIONS IN THE WARNING INCLUDE THE NOTOM ROAD IN CAPITOL REEF 
NATIONAL PARK AND OTHER SECONDARY ROADS IN THE VICINITY

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 11117 3834 11102 3837 11074 3816 11065
      3774 11082 3775 11097 3782 11108 3796 11117

$$

LC

640 
WGUS75 KSLC 280009
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
609 PM MDT WED JUL 27 2011

UTC017-055-280017-
/O.EXP.KSLC.FF.W.0015.000000T0000Z-110728T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-WAYNE UT-
609 PM MDT WED JUL 27 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 615 PM MDT FOR SOUTH
CENTRAL WAYNE AND CENTRAL GARFIELD COUNTIES...

HEAVY RAIN HAS ENDED ACROSS THE AREA. RIVERS AND STREAMS NEAR AND 
ALONG THE NOTOM ROAD AND IN THE VICINITY OF CAPITOL REEF NATIONAL 
PARK WILL GRADUALLY RECEDE 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 11117 3834 11102 3837 11074 3816 11065
      3774 11082 3775 11097 3782 11108 3796 11117

$$

LC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 8:11 PM MDT	Areal Flood Advisory	SLC	Juab, Millard	3 hr
Jul 27, 4:15 PM MDT	Severe Thunderstorm Warning	SLC	Utah	30 min
Jul 27, 4:52 PM MDT	Flash Flood Warning	SLC	Garfield, Wayne	3 hr
Jul 27, 5:45 PM MDT	Severe Thunderstorm Warning	SLC	Carbon, Duchesne	30 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.