Severe Thunderstorm Warning 51, NWS Salt Lake City, UT

Issued

Sep 8, 2002, 2:34 PM MDT (20:34 UTC)

Expired

Sep 8, 2002, 3:00 PM MDT

In force

26 min

Issued by

NWS Salt Lake City, UT

Area

Counties, with a storm outline in the text

Counties Kane County, UT, San Juan County, UT

The Cedar City radar (KICX), 135 km from the middle of the area, began a volume at 20:34 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.

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.

695 
WUUS55 KSLC 082034
SVRSLC
UTC025-037-082100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
232 PM MDT SUN SEP 8 2002

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL KANE COUNTY IN UTAH
  EXTREME SOUTHWESTERN SAN JUAN COUNTY IN SOUTHEAST UTAH

* UNTIL 300 PM MDT

* AT 224 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER EXTREME SOUTH CENTRAL KANE COUNTY...OR
  ABOUT 8 MILES NORTHWEST OF PAGE...MOVING EAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
OVER THE EXTREME SOUTHERN PORTION OF LAKE POWELL AT 240 PM.

LARGE HAIL AND STRONG WIND GUSTS OVER 60 MPH ARE POSSIBLE WITH THIS 
STORM.

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 900 PM MDT SUNDAY
EVENING FOR UTAH.

LAT...LON 3714 11168 3700 11166 3700 11117 3719 11118

NWS Salt Lake City, UT wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 8, 10:30 AM MDT, 4 hours 4 minutes earlier.

UTAH AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1030 AM MDT SUN SEP 8 2002

.SYNOPSIS...A VERY MOIST AND SOMEWHAT UNSTABLE AIRMASS WILL
REMAIN IN PLACE TODAY.  THE AIRMASS WILL DRY SOMEWHAT ON MONDAY
THEN MOISTURE WILL INCREASE AGAIN ON TUESDAY.

.DISCUSSION...JET LEVEL IMPULSE GENERATED A BROAD AREA OF RAIN OVER
NRN UT THIS MORNING THAT WILL BE MOVING OFF TO THE NORTHEAST WITHIN
AN HOUR OR TWO. NEXT FEATURE IS THE UPPER LEVEL TROF ITSELF. THE
NORTHERN BRANCH IS SHEARING OFF THROUGH THE NORTHERN ROCKIES LEAVING
A CLOSED CIRCULATION OVER SWRN NV. THIS FEATURE IS GENERATING A NEW
ROUND OF CONVECTION OVER WEST CENTRAL UT THAT WILL BE LIFTING NEWD
TODAY. MODELS HAVE BEEN LIFTING THIS CLOSED FEATURE THROUGH THE
NORTHERN PORTION OF THE FORECAST AREA TONIGHT WITH A DRAMATIC
DECREASE IN MOISTURE AND INSTABILITY BEHIND IT ON MON. CURRENT
WATER VAPOR SATELLITE IMAGERY SHOWS THIS CLOSED CIRCULATION STARTING
TO ELONGATE WITH PIECES SHEARING OUT TO THE NORTHEAST BUT ANY
EASTWARD MOTION HAS SLOWED. I HAVE MY DOUBTS ABOUT HOW STRONGLY WE
WILL DRY TOMORROW AND JUST HOW MUCH OF THE CLOSED CIRCULATION
ACTUALLY EJECTS. EVEN IF THE MODELS WERE RIGHT...THEY DO INDICATE
THAT A WEAK LOW REMAINS BEHIND OVER SRN CA AND THE FLOW AT LOWER
LEVELS BACKS RAPIDLY AROUND TO SELY MON NIGHT WITH MOISTURE SURGING
BACK INTO THE AREA TUE. SO WE WILL PROBABLY NEED TO RE-EXAMINE THE
FORECAST FOR TUE...AND WILL LEAVE MONDAY AS IS WITH CHANCE
POPS. FORECAST FOR TODAY AND TONIGHT IS FINE BUT WILL CONSIDER
ISSUING URBAN AND SMALL STREAM ADVISORY FOR THE NORTHERN ZONES.
WILL SEE HOW THINGS DEVELOP BY MIDDAY AND MAY UPDATE THEN.

SLC 763  CDC 764  WILENSKY

.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; radar from the NEXRAD Level II archive.