Alert archive / Utah / Flash Flood Warnings in 2002

Flash Flood Warning 19, NWS Salt Lake City, UT

September 6, 2002Washington County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Sep 6, 2002, 8:38 PM MDT for Washington County, Utah. It was in force for 82 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 6, 2002, 8:38 PM MDT (02:38 UTC)
Expired: Sep 6, 2002, 10:00 PM MDT
In force: 82 min
Issued by: NWS Salt Lake City, UT
Area: Counties, with a storm outline in the text

County Washington County, UT

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 2.6 hours before the alert went out and 250 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: 66 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 1169 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 77 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 070238
FFWSLC
UTC053-070400-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
837 PM MDT FRI SEP 6 2002

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN WASHINGTON COUNTY IN UTAH

* UNTIL 1000 PM MDT

THE PUBLIC REPORTED FLASH FLOOD CONDITIONS IN EASTERN WASHINGTON 
COUNTY THIS EVENING. EXCESSIVE RUNOFF FROM EARLIER AND CURRENT 
STORMS WILL CONTINUE TO CAUSE FLASH FLOODING OF CREEKS AND 
STREAMS...ROADS AND ROADSIDE CULVERTS. THE HEAVY RAINS COULD ALSO 
TRIGGER ROCK AND MUDSLIDES IN STEEP TERRAIN.

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 3701 11337 3701 11313 3701 11291 3748 11290
          3746 11305 3746 11324

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 6, 6:33 PM MDT	Severe Thunderstorm Warning	SLC	Salt Lake, Utah, Wasatch	42 min
Sep 6, 6:56 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder	34 min
Sep 6, 7:26 PM MDT	Severe Thunderstorm Warning	SLC	Kane, Washington	64 min
Sep 6, 8:17 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder	43 min
Sep 6, 8:43 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder	47 min
Sep 6, 10:30 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder	30 min
Sep 7, 7:49 AM MDT	Severe Thunderstorm Warning	SLC	Kane	26 min
Sep 7, 2:29 PM MDT	Severe Thunderstorm Warning	SLC	Garfield, San Juan	31 min

Nearby

Flash Flood Warnings in Utah, 2002 Every flash flood warning in 2002

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.