Severe Thunderstorm Warning 35, NWS Salt Lake City, UT

Issued

Aug 29, 2002, 1:02 PM MDT (19:02 UTC)

Expired

Aug 29, 2002, 1:45 PM MDT

In force

43 min

Issued by

NWS Salt Lake City, UT

Area

Counties, with a storm outline in the text

County Carbon County, UT

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

483 
WUUS55 KSLC 291902
SVRSLC
UTC007-291945-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
100 PM MDT THU AUG 29 2002

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CARBON COUNTY IN UTAH

* UNTIL 145 PM MDT

* AT 1255 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER SUNNYSIDE...OR ABOUT 18 MILES EAST OF
  PRICE...MOVING NORTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  2 MILES NORTHWEST OF SUNNYSIDE AT 110 PM MDT

VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A
SUBSTANTIAL SHELTER.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM MDT 
THURSDAY EVENING FOR EXTREME EASTERN UTAH.

LAT...LON 3958 11064 3944 11050 3957 11006 3981 11030

NWS Salt Lake City, UT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 29, 9:25 AM MDT, 3 hours 37 minutes earlier.

UTAH AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
925 AM MDT THU AUG 29 2002

.SYNOPSIS...AN UPPER LEVEL TROUGH WILL MOVE ACROSS THE AREA TODAY.
THE AIR MASS WILL BE MOIST AND UNSTABLE OVER THE NORTHERN AND
EASTERN PORTIONS OF THE AREA WITH DRIER AIR OVER SOUTHWEST UTAH.
THE DRIER AIR WILL SPREAD ACROSS THE REMAINDER OF THE AREA FOR
FRIDAY.

.DISCUSSION...SURFACE BOUNDARY AND PRESSURE TROUGH STILL LAYING
ACROSS THE NW DESERT AND THE GREAT SALT LAKE. UPPER TROUGH HAS
CIRCULATION CENTER OVER CENTRAL ID WITH TROUGH AXIS EXTENDING SOUTH
INTO CENTRAL NV. LATEST 12Z ETA SHOWS THIS FEATURE AND ASSOCIATED
POSITIVE DIFFERENTIAL VORTICITY ADVECTION ARRIVING IN NW UT BETWEEN
21Z AND 00Z. 12Z SLC SOUNDING SHOWS CLASSIC MICROBURST INVERTED V
SOUNDING AND THERE WERE REPORTS OF A FEW GUSTS TO NEAR 50 MPH LAST
NIGHT. ETA FORECASTS LIS BETWEEN 0 AND MINUS 2 THIS AFTERNOON FROM
ABOUT SLC NORTHWARD WITH PW VALUES OF AROUND .55 INCHES.  ETA AND
RUC 400-850 VECTOR SHEAR STAYS AT 30 KNOTS OR BELOW ALL DAY.

ALL THE ABOVE ADDS UP TO GOOD DYNAMIC FORCING ALOFT...A SURFACE
BOUNDARY AND JUST ENOUGH MOISTURE AND INSTABILITY TO GENERATE
WIDESPREAD THUNDERSTORMS.  HOWEVER WITHOUT ADEQUATE SHEAR OR LOW
LEVEL MOISTURE THE MOST LIKELY MANIFESTATION OF THESE STORMS WILL BE
STRONG MICROBURST WINDS AND DRY LIGHTNING AND JUST A LITTLE RAIN.

HAVE UPDATED 1ST PERIOD FORECASTS TO REMOVE WORDING THAT HAD RAIN
SHOWER THREAT DECREASING IN THE AFTERNOON IN THE NW...DUE TO THE
SLOWER TIMING IN NEW ETA...AND HAVE ADDED STRONG GUSTY WINDS NEAR
SHOWER WORDING DUE TO MICROBURST THREAT.

NO CHANGES TO SOUTHERN ZONES AT THIS TIME....EXPECT AIRMASS TO BE
TOO DRY TO SUPPORT CONVECTION IN THE SOUTHWEST.

SLC 31- CDC 1-0  DUNN

.SLC...NONE.

Severe Thunderstorm Warnings in Utah, 2002Every severe thunderstorm warning in 2002

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.