Alert archive / Utah / Flash Flood Warnings in 2002

Flash Flood Warning 20, NWS Salt Lake City, UT

September 12, 2002Emery County, Sevier County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Sep 12, 2002, 1:41 PM MDT for Emery County, Sevier County, Utah. It was in force for 64 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 12, 2002, 1:41 PM MDT (19:41 UTC)
Expired
Sep 12, 2002, 2:45 PM MDT
In force
64 min
Issued by
NWS Salt Lake City, UT
Area
Counties, with a storm outline in the text

Counties Emery County, UT, Sevier County, UT

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 7.7 hours before the alert went out and 212 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, Salt Lake City I, UT at 12:00Z on 2002-09-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 12 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salt Lake City I, UT at 12:00Z on 2002-09-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -16 square meters per square second.1939Sfc1 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
12 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
1101 m above ground
0-6 km bulk shear
3 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
-10 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 121941
FFWSLC
UTC015-041-122045-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
141 PM MDT THU SEP 12 2002

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WEST CENTRAL EMERY COUNTY IN UTAH
  NORTHEASTERN SEVIER COUNTY IN UTAH

* UNTIL 245 PM MDT

* AT 135 PM MDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY 
  RAIN NEAR EMERY.  FLOODING IS REPORTED IN EMERY.

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 3898 11133 3881 11153 3868 11131 3900 11091
          3916 11117

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 12, 12:23 PM MDTTornado WarningSLCSanpete7 min
Sep 12, 2:17 PM MDTFlash Flood WarningSLCGarfield118 min
Sep 12, 2:25 PM MDTFlash Flood WarningSLCKane2 hr
Sep 12, 3:08 PM MDTFlash Flood WarningSLCEmery, Garfield, Kane, Wayne112 min
Sep 12, 3:28 PM MDTSevere Thunderstorm WarningSLCGarfield, Kane47 min
Sep 12, 4:24 PM MDTTornado WarningSLCCarbon36 min
Sep 12, 4:24 PM MDTTornado WarningSLCCarbon36 min
Sep 12, 4:50 PM MDTSevere Thunderstorm WarningSLCWashington25 min
Sep 12, 4:52 PM MDTFlash Flood WarningSLCCarbon, Emery113 min
Sep 12, 5:07 PM MDTFlash Flood WarningSLCCarbon, Emery98 min

Nearby

Flash Flood Warnings in Utah, 2002Every 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.