Severe Thunderstorm Warning 1, NWS Seattle, WA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
310 PM PST FRI MAR 10 2006

.SYNOPSIS...A COOL UPPER LEVEL TROUGH NEAR THE COAST WILL MAINTAIN A
CHANCE OF SHOWERS OVER WESTERN WASHINGTON THROUGH THE WEEKEND. A
FRONTAL SYSTEM WILL REACH WESTERN WASHINGTON ON MONDAY...WITH
ANOTHER UPPER LEVEL TROUGH SETTLING IN JUST OFFSHORE THE REMAINDER
OF NEXT WEEK.

&&

.SHORT TERM...CONVECTION HAS FINALLY INCREASED THIS AFTERNOON BUT
REMAINS SCATTERED. THE ONLY THUNDER TO SPEAK OF HAS BEEN DOWN OVER
NW OREGON AND VERY ISOLATED. WITH NO LARGE SCALE FORCING TO SPEAK OF
THE SHOWER ACTIVITY SHOULD DIE DOWN AFTER SUNSET.

THE MAIN UPPER LEVEL LOW WILL REMAIN PARKED A LITTLE WEST OF ASTORIA
THROUGH MIDDAY SATURDAY THEN DRIFT FURTHER SOUTH AND EAST. THE
MODELS BRING A VERY WEAK UPPER LEVEL TROUGH ACROSS THE AREA SUNDAY
AFTERNOON...BUT THIS WILL ONLY SERVE TO CONTINUE THE CHANCE OF
SHOWERS. THE COOL AND UNSTABLE AIR MASS IS THE MAIN FACTOR AND WILL
REMAIN OVER THE AREA THROUGH SUNDAY NIGHT...WITH SHOWER ACTIVITY
MAINLY DIURNAL IN NATURE. THE AIR MASS REMAINS COLD ENOUGH FOR SNOW
SHOWERS AND HAVE INCLUDED THIS IN THE ZONES. COULD ALSO HAVE A FEW
CLAPS OF THUNDER...BUT THE LIKELIHOOD AND COVERAGE ISNT HIGH ENOUGH
TO PLASTER THE PUBLIC ZONE FORECAST WITH A CHANCE OF THUNDERSTORMS.
SEE THE AVIATION DISCUSSION BELOW.

ANOTHER UPPER LEVEL LOW HEADS OUR WAY EARLY NEXT WEEK...RIGHT AFTER
THIS WEEKENDS LOW DEPARTS. THIS DEVELOPS OUT OF THE BIG TROUGH
PRESENTLY NEAR THE DATELINE. THE ASSOCIATED COLD FRONT NEAR 160W
THIS AFTERNOON EVENTUALLY SLIDES IN OVER WESTERN WA MONDAY
AFTERNOON. ANOTHER LOW SETS UP OFFSHORE BEHIND THE FRONT. KAM

.LONG TERM...EXTENDED LOOKS TO BE WET WITH A SYSTEM MOVING THRU
MONDAY NIGHT...AND A STRONGER ONE COMING IN THURSDAY MORNING.
TEMPERATURES LOOK TO WARM UP CLOSER TO NORMAL BY FRIDAY. EXTENDED
FORECAST LOOKS TO BE ON TRACK...NO BIG CHANGES MADE. GRUB

&&

.AVIATION...SCT SHOWERS DVLPG ACROSS THE AREA WITH BRIEF MIXED SNOW
AND SMALL HAIL POSSIBLE WITH ANY SHOWER.  AN ISOLATED THUNDERSTORM
POSSIBLE MAINLY S OF KSEA...WILL INCLUDE IN KSEA-KPDX TWB ROUTE BUT
NOT IN KSEA TAF. ACTIVITY SHOULD DECREASE AND END BTW 02-04Z. MAINLY
SCT CLOUDS 4-5K FT...BUT KSEA SWD MAY BECOME BKN 3K FT THROUGH 04Z
W/ CB.

KSEA...NW WIND 5-10 KT BECOMING LIGHT/VAR AFT 05Z. STRATUS AND FOG
NOT EXPECTED SAT MORNING DUE TO UNSTBL AMS. MAINLY VFR CONDS...BUT
TEMPO MVFR CIGS POSSIBLE W/ SHOWERS THROUGH 04Z. DTM

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
    .SMALL CRAFT ADVISORY COASTAL WATERS FOR HAZARDOUS SEAS.
    .SMALL CRAFT ADVISORY FOR ROUGH BAR CONDITIONS ON THE GRAYS
      HARBOR BAR.

&&

WEATHER.GOV/SEATTLE

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
252 PM PST FRI MAR 10 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0245 PM     HAIL             3 WNW FREDERICKSON      47.10N 122.43W
03/10/2006  M0.25 INCH       PIERCE             WA   TRAINED SPOTTER

&&

GRUB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
311 PM PST FRI MAR 10 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0309 PM     HAIL             10 S PUYALLUP           47.04N 122.28W
03/10/2006  E0.25 INCH       PIERCE             WA   TRAINED SPOTTER

            HALF INCH ON THE ROADWAYS NEAR GRAHAM.

&&

GRUB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
320 PM PST FRI MAR 10 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0316 PM     SNOW             SEATTLE                 47.62N 122.35W
03/10/2006  M0.0 INCH        KING               WA   OFFICIAL NWS OBS

            LIGHT SNOW PELLET SHOWERS MOVING NORTHWEST.

0319 PM     SNOW             SEATTLE                 47.62N 122.35W
03/10/2006  E0.0 INCH        KING               WA   OFFICIAL NWS OBS

            LIGHT SNOW PELLET SHOWERS MOVING NORTHWEST. NO
            ACCUMULATION.

&&

GRUB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
440 PM PST FRI MAR 10 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0438 PM     HAIL             4 SSW BELLEVUE          47.55N 122.18W
03/10/2006  M0.50 INCH       KING               WA   TRAINED SPOTTER

            HAIL ACCUMULATING ON GROUND.

&&

GRUB

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