Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 242226
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
230 PM PST TUE FEB 24 2015

.SYNOPSIS...LIGHT RAIN WILL DEVELOP ON THE COAST WEDNESDAY AFTERNOON
AND SPREAD INLAND WEDNESDAY NIGHT. A SHOWERY PATTERN WILL PERSIST
THROUGH FRIDAY. DRY OFFSHORE FLOW WILL DEVELOP THIS WEEKEND...THEN A
CHANCE OF RAIN WILL RETURN EARLY NEXT WEEK. TEMPERATURES WILL BE
LOWER THAN THEY HAVE BEEN RECENTLY...CLOSER TO NORMAL.

&&

.SHORT TERM...THERE ARE BANDS OF HIGH CLOUDS OVER WESTERN WASHINGTON
THIS AFTERNOON...AND THICKER AND LOWER CLOUDS HAVE MOVED ONTO THE
NORTH COAST. THESE ARE ASSOCIATED WITH A WEAK WEATHER SYSTEM THAT
COULD BRING A LITTLE RAIN TO MAINLY THE COAST AND OLYMPICS TONIGHT.
ENOUGH UNCERTAINTY EXISTS TO PUT LOW CHANCE POPS OVER ROUGHLY THE
SOUTHWESTERN TWO THIRDS OF THE AREA TONIGHT.

A STRONGER AND MORE CONSOLIDATED SYSTEM WILL REACH THE COAST LATE
WEDNESDAY AFTERNOON. THIS WILL LIKELY SPREAD RAIN INLAND TO ALL
AREAS WEDNESDAY NIGHT. ON THURSDAY THE PATTERN WILL TURN MORE
SHOWERY. A LITTLE SUN THURSDAY AFTERNOON COULD ENHANCE THE SHOWERS.

SHOWERS REMAIN LIKELY THURSDAY NIGHT AND FRIDAY AS AN UPPER LEVEL
TROUGH SWINGS OVER THE REGION. BY FRIDAY AFTERNOON THERE IS LIKELY
TO BE SOME DRYING OVER THE INTERIOR. HIGH TEMPERATURES OVER THE
LOWLANDS ALL THREE DAYS WEDNESDAY THROUGH FRIDAY WILL BE IN THE LOW
TO MID 50S. IN THE MOUNTAINS COOLING WILL BE NOTICEABLE. HEIGHTS
FALL FROM 570 DM THIS MORNING TO THE 540S FRIDAY AFTERNOON. THE SNOW
LEVEL WILL FALL FROM NEARLY TEN THOUSAND FEET THIS MORNING TO
3000-4000 FEET FRIDAY. BURKE

.LONG TERM...THE WEEKEND LOOKS DRY AS ANY RESIDUAL SHOWERS MOVE OFF
TO THE SOUTH AND THE UPPER RIDGE WELL OFFSHORE NOSES INLAND. A WEAK
SYSTEM MAY BRING A LITTLE RAIN MONDAY OR TUESDAY. HIGHS BOTH DAYS
ARE FORECAST TO BE MOSTLY IN THE UPPER 40S...WHICH COULD BE THE
FIRST TIME SINCE FEBRUARY 1 THAT THE DAYTIME HIGH DOES NOT EXCEED
THE NORMAL HIGH. BURKE

&&

.HYDROLOGY...FLOODING IS UNLIKELY THE NEXT 7 DAYS.

&&

.AVIATION...CLOUDS SPREADING ONTO THE COAST EARLY THIS AFTERNOON
SHOULD CONTINUE TO PUSH INLAND AND FILL IN OVER MOST OF WESTERN WA
THIS EVENING. CIGS OUGHT TO BOTTOM OUT LATE TONIGHT THROUGH MID
MORNING ON WEDNESDAY AND THEN LIFT IN TYPICAL MARINE LAYER FASHION.
THIS WEAK SYSTEM MIGHT NOT GIVE MUCH IN THE WAY OF
PRECIPITATION...THERE IS NOTHING MUCH SHOWING UP ON THE RADAR AT 2PM.

KSEA...BECOMING CLOUDY OVERNIGHT WITH STRATUS SETTING UP AND THEN
BREAKING UP WED. THE BREEZE HAS BEEN WESTERLY THIS AFTERNOON AND
WILL PROBABLY BE VARIABLE OVERNIGHT IN A BROAD AREA OF WEAK
CONVERGENCE OVER PUGET SOUND.

&&

.MARINE...WESTERLY FLOW IN THE STRAIT WILL EASE OVERNIGHT. ONSHORE
FLOW IS PRETTY LIGHT OTHERWISE AND THE SYSTEM MOVING THROUGH THE
AREA IS RATHER WEAK. TEMPORARY WEAK HIGH PRESSURE WILL GIVE LIGHT
PRES GRADIENTS TO THE WATERS WEDNESDAY. ANOTHER WEAK SYSTEM WILL
MOVE ACROSS THE WATERS LATE WEDNESDAY NIGHT INTO THURSDAY AND WILL
BE FOLLOWED BY A WEAK LOW THAT WILL MOVE SOUTHEAST THROUGH THE
COASTAL WATERS LATE THURSDAY NIGHT INTO FRIDAY. THESE FEATURES ARE
NOT EXPECTED TO GIVE WINDS OVER 20 KNOTS TO THE WATERS. HIGH PRES
WILL BUILD OVER BRITISH COLUMBIA LATER FRIDAY INTO FRIDAY NIGHT OR
SATURDAY GIVING STRONGER N TO NE FLOW TO THE WATERS. SMALL CRAFT
ADVISORY CONDITIONS ARE LIKELY OVER PORTIONS OF THE COASTAL
WATERS...THE STRAIT OF JUAN DE FUCA...AND THE NORTHERN INLAND
WATERS.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...NONE.
PZ...SMALL CRAFT ADVISORY CENTRAL AND EAST STRAIT.

&&

$$

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