Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 3, NWS Salt Lake City, UT

June 30, 2011Emery County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jun 30, 2011, 9:15 AM MDT for Emery 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: Jun 30, 2011, 9:15 AM MDT (15:15 UTC)
Expired: Jun 30, 2011, 12:15 PM MDT
In force: 3 hr
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Flood severity: None

County Emery County, UT

The radar

The Grand Junction radar (KGJX), 212 km from the middle of the area, began a volume at 15:14 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, 3.3 hours before the alert went out and 189 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: 28 J/kg
Mixed-layer CIN: -222 J/kg
Mixed-layer LCL: 2557 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 279 m²/s²
0-3 km storm-relative helicity: 248 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.

458 
WGUS55 KSLC 301515
FFWSLC
UTC015-301815-
/O.NEW.KSLC.FF.W.0003.110630T1515Z-110630T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
915 AM MDT THU JUN 30 2011

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

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

* UNTIL 1215 PM MDT

* AT 900 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  LARGE THUNDERSTORMS AND HEAVY RAINFALL FALLING ALONG THE SAN       
  RAFAEL SWELL AREA NORTH OF GOBLIN VALLEY STATE PARK. RADAR         
  RAINFALL ESTIMATES INDICATE OVER 1.5 INCHES OF RAINFALL HAS FALLEN 
  IN AN HOURS TIME. AS A RESULT...FLASH FLOODING IS HIGHLY PROBABLE  
  IN THIS AREA. 

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 3882 11070 3888 11063 3881 11052 3866 11046
      3860 11065 3868 11074

$$

MCINERNEY

2 follow-up statements

098 
WGUS75 KSLC 301658
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1058 AM MDT THU JUN 30 2011

UTC015-301815-
/O.CON.KSLC.FF.W.0003.000000T0000Z-110630T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
EMERY UT-
1058 AM MDT THU JUN 30 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 PM MDT FOR
SOUTH CENTRAL EMERY COUNTY...

AT 1044 AM MDT...INTENSE THUNDERSTORM ACTIVITY OVER THE AREA NORTH 
OF GOBLIN VALLEY STATE PARK RECEIVED OVER 1.5 INCHES OF 
PRECIPITATION IN AN HOUR.  THIS AREA IS VERY FLASH FLOOD PRONE...AND 
FLASH FLOODING IS INFERRED FROM THE RAIN INTENSITIES AND VOLUMES. 
THE FLOODING IS EXPECTED TO FLOW FROM THE AREA WEST OF SR24 EAST TO 
THE GREEN RIVER.

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 600 PM MDT
THURSDAY EVENING FOR CENTRAL UTAH.

&&

LAT...LON 3882 11070 3888 11063 3881 11052 3866 11046
      3860 11065 3868 11074

$$

MCINERNEY

700 
WGUS75 KSLC 301812
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1212 PM MDT THU JUN 30 2011

UTC015-301820-
/O.EXP.KSLC.FF.W.0003.000000T0000Z-110630T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
EMERY UT-
1212 PM MDT THU JUN 30 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1215 PM MDT FOR SOUTH
CENTRAL EMERY COUNTY...

THUNDERSTORM ACTIVITY IN THE AREA HAS DIMINISHED AND AS A 
RESULT...FLASH FLOODING IN THE AREA HAS ATTENUATED.

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 600 PM MDT
THURSDAY EVENING FOR CENTRAL UTAH.

LAT...LON 3882 11070 3888 11063 3881 11052 3866 11046
      3860 11065 3868 11074

$$

MCINERNEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 6:48 PM MDT	Areal Flood Warning	SLC	Salt Lake	15 hr
Jun 29, 7:05 PM MDT	Severe Thunderstorm Warning	SLC	Sanpete	40 min
Jun 29, 8:01 PM MDT	Special Weather Statement	SLC	Wasatch	59 min
Jun 30, 6:15 AM MDT	Areal Flood Warning	SLC	Summit	8 hr
Jun 30, 8:14 AM MDT	Special Weather Statement	SLC	Duchesne	31 min
Jun 30, 8:22 AM MDT	Special Weather Statement	SLC	Emery	38 min
Jun 30, 8:35 AM MDT	Severe Thunderstorm Warning	SLC	Emery	25 min
Jun 30, 8:38 AM MDT	Severe Thunderstorm Warning	SLC	Emery	37 min
Jun 30, 9:01 AM MDT	Severe Thunderstorm Warning	SLC	Emery	29 min
Jun 30, 9:15 AM MDT	Special Weather Statement	SLC	Carbon	45 min
Jun 30, 9:22 AM MDT	Severe Thunderstorm Warning	SLC	Carbon, Emery	23 min
Jun 30, 9:26 AM MDT	Severe Thunderstorm Warning	SLC	Emery	34 min
Jun 30, 9:33 AM MDT	Severe Thunderstorm Warning	SLC	Emery	27 min
Jun 30, 9:44 AM MDT	Special Weather Statement	SLC	Carbon	31 min
Jun 30, 9:46 AM MDT	Severe Thunderstorm Warning	SLC	Emery	29 min
Jun 30, 9:53 AM MDT	Severe Thunderstorm Warning	SLC	Carbon, Emery	52 min
Jun 30, 10:45 AM MDT	Severe Thunderstorm Warning	SLC	Carbon, Duchesne	19 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.