Alert archive / Utah / Flash Flood Warnings in 2011

Flash Flood Warning 17, NWS Salt Lake City, UT

July 31, 2011Garfield County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 31, 2011, 4:49 PM MDT for Garfield County, Utah. It was in force for 6 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, 4:49 PM MDT (22:49 UTC)
Expired: Jul 31, 2011, 10:45 PM MDT
In force: 6 hr
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Flood severity: None

County Garfield County, UT

The radar

The Cedar City radar (KICX), 123 km from the middle of the area, began a volume at 22:51 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 10.8 hours before the alert went out and 273 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: 291 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 1089 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 52 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.

368 
WGUS55 KSLC 312249
FFWSLC
UTC017-010445-
/O.NEW.KSLC.FF.W.0017.110731T2249Z-110801T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL GARFIELD COUNTY IN UTAH...
  THIS INCLUDES THE CITY OF ESCALANTE...

* UNTIL 1045 PM MDT

* AT 444 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
THUNDERSTORMS CAPABLE OF PRODUCING FLASH FLOODING CAPABLE OF 
PRODUCING FLASH FLOODING ACROSS ALVEY AND HARRIS WASH.

* FLASH FLOODING IS EXPECTED ALONG ALVEY WASH AND HARRIS WASH FROM 
THE HEADWATERS TO THE CONFLUENCE WITH THE ESCALANTE RIVER. THIS WILL 
ALSO IMPACT THE HOLE IN THE ROCK ROCK AS IT CROSSES THE ALVEY AND 
HARRIS WASH AREA.

RADAR ESTIMATES IN EXCESS OF 2 INCHES IN ONE HOUR HAVE OCCURRED 
ALONG PORTIONS OF ALVEY WASH. ADDITIONAL RAINFALL IS EXPECTED OVER 
THE NEXT SEVERAL HOURS.

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 3777 11164 3775 11143 3768 11130 3767 11122
      3764 11120 3761 11135 3754 11162 3761 11180

$$

KRUSE

3 follow-up statements

023 
WGUS55 KSLC 312254 CCA
FFWSLC
UTC017-010445-
/O.COR.KSLC.FF.W.0017.110731T2249Z-110801T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL GARFIELD COUNTY IN UTAH...
  THIS INCLUDES THE CITY OF ESCALANTE...

* UNTIL 1045 PM MDT

* AT 444 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS CAPABLE OF PRODUCING FLASH FLOODING CAPABLE OF
PRODUCING FLASH FLOODING ACROSS ALVEY AND HARRIS WASH.

* FLASH FLOODING IS EXPECTED ALONG ALVEY WASH AND HARRIS WASH FROM
THE HEADWATERS TO THE CONFLUENCE WITH THE ESCALANTE RIVER. THIS WILL
ALSO IMPACT THE HOLE IN THE ROCK ROAD AS IT CROSSES THE ALVEY AND
HARRIS WASH AREA.

RADAR ESTIMATES IN EXCESS OF 2 INCHES IN ONE HOUR HAVE OCCURRED
ALONG PORTIONS OF ALVEY WASH. ADDITIONAL RAINFALL IS EXPECTED OVER
THE NEXT SEVERAL HOURS.

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 3777 11164 3775 11143 3768 11130 3767 11122
      3764 11120 3761 11135 3754 11162 3761 11180

$$

KRUSE

962 
WGUS75 KSLC 010142
FFSSLC

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

UTC017-010445-
/O.CON.KSLC.FF.W.0017.000000T0000Z-110801T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-
742 PM MDT SUN JUL 31 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM MDT FOR
SOUTH CENTRAL GARFIELD COUNTY...

AT 733 PM MDT...ALTHOUGH THE HEAVY RAIN HAS DIMINISHED ACROSS THE 
AREA...FLASH FLOODING IS STILL POSSIBLE ALONG THE ALVEY WASH AND 
HARRIS WASH FROM THE HEADWATERS TO THE CONFLUENCE WITH THE ESCALANTE 
RIVER. THIS WILL ALSO IMPACT THE HOLE IN THE ROCK ROAD AS IT CROSSES 
THE ALVEY AND HARRIS WASH AREA. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ESCALANTE

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 3777 11164 3775 11143 3768 11130 3767 11122
      3764 11120 3761 11135 3754 11162 3761 11180

$$

STRUTHWOLF

129 
WGUS75 KSLC 010440
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1040 PM MDT SUN JUL 31 2011

UTC017-010446-
/O.EXP.KSLC.FF.W.0017.000000T0000Z-110801T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-
1040 PM MDT SUN JUL 31 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1045 PM MDT FOR SOUTH
CENTRAL GARFIELD COUNTY...

HEAVY RAIN HAS ENDED ACROSS SOUTH CENTRAL GARFIELD COUNTY. RUNOFF IN 
ALVEY AND HARRIS WASH FROM EARLIER HEAVY RAIN WILL DECREASE 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 3777 11164 3775 11143 3768 11130 3767 11122
      3764 11120 3761 11135 3754 11162 3761 11180

$$

LC

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, 5:12 PM MDT	Flash Flood Warning	SLC	Washington	3 hr
Jul 31, 5:52 PM MDT	Flash Flood Warning	SLC	Wayne	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.