Alert archive / Utah / Flash Flood Warnings in 2004

Flash Flood Warning 39, NWS Salt Lake City, UT

December 29, 2004Washington County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Dec 29, 2004, 8:32 AM MST for Washington 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
Dec 29, 2004, 8:32 AM MST (15:32 UTC)
Expired
Dec 29, 2004, 2:30 PM MST
In force
6 hr
Issued by
NWS Salt Lake City, UT
Area
Counties, with a storm outline in the text

County Washington County, UT

The radar

The Cedar City radar (KICX), 54 km from the middle of the area, began a volume at 15:36 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

Mercury/Desert R, NV (KDRA), launched 12:00Z, 3.5 hours before the alert went out and 245 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-pSkew-T log-p diagram, Mercury/Desert R, NV at 12:00Z on 2004-12-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Mercury/Desert R, NV at 12:00Z on 2004-12-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 167 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
636 m above ground
0-6 km bulk shear
73 kt
0-1 km storm-relative helicity
167 m²/s²
0-3 km storm-relative helicity
275 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.

000 
WGUS55 KSLC 291537
FFWSLC
UTC053-292130-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
832 AM MST WED DEC 29 2004

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WASHINGTON COUNTY IN UTAH
  THIS INCLUDES THE CITY OF ST. GEORGE

* UNTIL 230 PM MST


* LOCATIONS IN THE WARNING INCLUDE ALL THE SMALL STREAMS AND 
NORMALLY DRY WASHES IN WASHINGTON COUNTY.

HEAVY RAINFALL TODAY WILL ADD TO THE HEAVY RAIN THAT FELL OVERNIGHT. 
ADDITIONAL RAINFALL AMOUNTS OF 1-2 INCHES ARE EXPECTED IN THE WARNED 
AREA TODAY. SMALL STREAMS AND NORMALLY DRY WASHES WILL BE RUNNING 
TODAY. VERY RAPID RISES IN STREAMS AND WASHES ARE LIKELY TODAY.

DO NOT ATTEMPT TO DRIVE THROUGH RUNNING WASHES. IT ONLY TAKES 1-2 
FEET OF WATER TO FLOAT A VEHICLE. 


LAT...LON 3699 11403 3758 11405 3754 11349 3752 11346
      3752 11327 3746 11323 3745 11305 3748 11304
      3748 11290 3701 11291

$$

DUNN

Nearby

Flash Flood Warnings in Utah, 2004Every flash flood warning in 2004

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.