Alert archive / Utah / Flash Flood Warnings in 2004

Flash Flood Warning 13, NWS Salt Lake City, UT

July 15, 2004Washington County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 15, 2004, 4:20 PM MDT for Washington 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: Jul 15, 2004, 4:20 PM MDT (22:20 UTC)
Expired: Jul 15, 2004, 7:15 PM MDT
In force: 3 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), 77 km from the middle of the area, began a volume at 22:22 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, 10.3 hours before the alert went out and 235 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: 240 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 2064 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 16 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 152223
FFWSLC
UTC053-160115-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
420 PM MDT THU JUL 15 2004

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

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

* UNTIL 715 PM MDT


A FLASH FLOOD WARNING HAS BEEN ISSUED ALONG THE FORT PIERCE AND 
MOKAAC WASHES ON THE SOUTHERN BORDER OF UTAH. THESE WASHES ORIGINATE 
IN ARIZONA AND FLOW NORTHWARD INTO UTAH. THESE DRAINAGES HAVE A HIGH 
POTENTIAL FOR FLASH FLOODING. HEAVY RAIN HAS BEEN FALLING IN THE 
UPPER PORTION OF THESE WASHES AND FLASH FLOODING IS EXPECTED WITHIN 
THE NEXT 1 TO 3 HOURS IN SOUTHERN WASHINGTON COUNTY.

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. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
SALT LAKE CITY.

LAT...LON 3709 11328 3700 11323 3701 11366 3708 11360

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 5:18 PM MDT	Flash Flood Warning	SLC	Kane, Washington	117 min

Nearby

Flash Flood Warnings in Utah, 2004 Every 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.