Heavy Snow in Utah, April 3, 2003

UTAH AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
300 AM MST THU APR 3 2003

.SYNOPSIS...A DEEP TROUGH OVER THE WEST WILL REMAIN THROUGH THE
WEEKEND WITH UNSEASONABLY COOL AND UNSETTLED WEATHER ACROSS MOST OF
THE FORECAST AREA.

.DISCUSSION...AIR MASS WILL REMAIN QUITE UNSTABLE OVER NORTHERN AND
CENTRAL UTAH WITH COLD POCKET AT 500 MB AS COLD AS WE HAVE
SEEN AT ANYTIME THIS PAST WINTER SEASON MOVING OVER HEAD THIS
MORNING. JET STREAK MOVING INTO CENTRAL CALIFORNIA WILL PLACE
NORTHERN UTAH UNDER FAVORABLE LIFT THROUGH THIS MORNING BEFORE
EXITING INTO COLORADO BY THIS AFTERNOON. COMBINATION OF INSTABILITY
AND JET LEVEL DYNAMICS WILL KEEP SNOW OR SNOW SHOWERS OVER NORTHERN
MOUNTAINS GOING THIS MORNING INTO EARLY AFTERNOON WITH MORE SCATTERED
TYPE OF SNOW SHOWER ACTIVITY LATE THIS AFTERNOON. WILL EXPAND
SNOW ADVISORY TO INCLUDE MORE OF THE NORTHERN MOUNTAINS TODAY AS
WELL AS PORTIONS OF THE WASATCH FRONT AS BAND OF ECHOES SLOW TO MOVE
OVER SALT LAKE AND UTAH COUNTIES. ALSO AM CONCERNED THAT AREAS
EAST OF THE GREAT SALT LAKE WILL SEE LAKE ENHANCED SNOW SHOWERS LATER
THIS MORNING FOR POSSIBLE SNOW ADVISORY AMOUNTS THERE AS WELL. MESO-
ETA SHOWING A RENEWED AREA OF SNOW OVER THIS AREA BY LATE MORNING
SO WILL GO WITH SNOW ADVISORIES TODAY...MAINLY REACHING CRITERIA ON
GRASSY SURFACES.

SOUTHERN UTAH FOR THE MOST PART SHOULD BE JUST PARTLY CLOUDY TODAY
WITH PERHAPS SOME MOUNTAIN SNOW SHOWERS DUE TO INSTABILITY AS
FAVORABLE DYNAMICS REMAIN NORTH.

NEXT SYSTEM TO EFFECT THE AREA IS THE DOUBLE STRUCTURED FEATURE
MOVING SOUTH OUT OF THE GULF OF ALASKA. AS THIS APPROACHES THE WEST
COAST TONIGHT A WEAK FLAT RIDGE WILL DEVELOP OVER THE INTERMOUNTAIN
REGION WHICH SHOULD SHUT OFF MOST IF NOT ALL SHOWER ACTIVITY. THE
ETA/AVN SHOW VARYING AMOUNTS OF UPPER LEVEL DYNAMICS MOVING ACROSS
THE AREA FRIDAY BUT WITH SOMEWHAT DRIER LOW LEVELS DEVELOPING UNDER
A SOUTHWEST FLOW. ATMOSPHERE STILL COLD ALOFT AND ANY BREAKS OF
SUNSHINE EARLY COULD ALLOW SOME INSTABILITY SHOWERS TO DEVELOP OVER
NORTHERN HALF OF AREA SO WILL ADD CHANCE OF SNOW SHOWERS TO
FORECAST FOR FRIDAY.

THE MAIN SYSTEM ITSELF WILL MOVE IN FRIDAY NIGHT THROUGH SATURDAY
WITH THE COLD FRONT MOVING THROUGH THE ENTIRE STATE BY SATURDAY
AFTERNOON. THE COLD POCKET ALOFT REMAINS OVERHEAD INTO SUNDAY SO
WILL KEEP THREAT OF INSTABILITY SHOWERS GOING. LATEST GFS/UK ARE
SHARPER AND SLIGHTLY STRONGER WITH RIDGE DEVELOPING OVER THE WESTERN
PORTION OF THE GREAT BASIN CUTTING OFF ANY THREAT OF SHOWERS. THIS
RIDGE REMAINS STRONG THROUGH WEDNESDAY AS DEEP TROUGH DEVELOPS OFF
THE WEST COAST. BIG WARM UP MONDAY THROUGH WEDNESDAY ACROSS ENTIRE
AREA.

SLC 734  CDC 201 STRUTHWOLF

.SLC...SNOW ADVISORIES PORTIONS OF WASATCH FRONT AND MOST
NORTHERN MOUNTAINS TODAY.

IDZ024-025-UTZ001>021-WYZ021-031400-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
700 AM MST WED APR 2 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO-THIRDS OF
UTAH...EXTREME SOUTHEAST IDAHO AND EXTREME SOUTHWEST WYOMING

.DAY ONE... TODAY

A COLD FRONT WILL PUSH ACROSS THE AREA TODAY.  VERY STRONG SOUTH
WINDS WILL BE COMMON AHEAD OF THE FRONT WITH HIGH WIND WARNINGS AND
ADVISORIES IN EFFECT FOR MOST AREAS. MOUNTAIN SNOW WILL ALSO BE
COMMON THIS AFTERNOON AND TONIGHT WITH A SNOW ADVISORY FOR THE
WASATCH MOUNTAINS.  SEE SLCNPWSLC AND SLCWSWSLC FOR DETAILS.

.DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY

VERY COOL AND UNSETTLED WEATHER WILL CONTINUE THROUGH THE WEEKEND.
HOWEVER NO WIDESPREAD HAZARDOUS CONDITIONS ARE EXPECTED DURING THIS
TIME FRAME. MONDAY AND TUESDAY WILL BE DRIER WITH A WARMING TREND.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURE.

WCJIN-WYSW