194
FXUS66 KSEW 260248
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
747 PM PDT MON MAR 25 2019
UPDATE
WIDESPREAD RAIN CONTINUES TO MOVE ACROSS THE REGION THIS
EVENING. THE FORECAST IS IN GOOD SHAPE AT THE MOMENT AND NO
IMMEDIATE UPDATES ARE NEEDED. -WOLCOTT-
SYNOPSIS
A WEAKENING FRONT WILL THROUGH THE AREA THIS EVENING
WITH RAIN CHANGING TO SHOWERS. POST FRONTAL SHOWERS WILL END ON
TUESDAY. A SECOND SYSTEM WILL CLIP THE SOUTHERN PART OF THE AREA
ON WEDNESDAY. AN UPPER LEVEL LOW OFF THE OREGON COAST THURSDAY
WILL DISSIPATE FRIDAY. THE NEXT SYSTEM WILL ARRIVE LATE NEXT
WEEKEND.
SHORT TERM /TONIGHT THROUGH THURSDAY/
A FRONT WILL PUSH NORTH
THROUGH THE AREA THIS EVENING. AREAS OF LIGHT RAIN WILL CHANGE TO
SPOTTY SHOWERS TONIGHT AS THE FRONT PUSHES NORTH INTO CANADA.
THERE MIGHT BE AN ISOLATED THUNDERSTORM OFF THE CENTRAL COAST
BEHIND THE FRONT TONIGHT WHERE IT WILL BE A BIT UNSTABLE BUT THE
THREAT LOOKS TOO LOW TO MENTION IN THE FORECAST.
ISOLATED TO SCATTERED SHOWERS WILL LINGER BEHIND THE FRONT INTO
TUESDAY, ESPECIALLY OVER THE MOUNTAINS. SHOWERS SHOULD PRETTY MUCH
END ENTIRELY TUESDAY EVENING AS WEAK HIGH PRESSURE ALOFT MOVES
OVERHEAD. MOST OF THE AREA IS LOOKING DRY ON WEDNESDAY AS WELL.
DIFLUENT SOUTHERLY FLOW ALOFT AHEAD OF AN UPPER LOW OFF THE OREGON
COAST WILL BRING A THREAT OF SHOWERS TO AREAS SOUTH OF SEATTLE
LATER WEDNESDAY. THE CHANCE OF SHOWERS WILL EXPAND TO MOST OF
WESTERN WASHINGTON WEDNESDAY NIGHT AND THURSDAY AS THE UPPER LOW
OFFSHORE OREGON SLOWLY APPROACHES THE COAST. TEMPERATURES WILL BE
NEAR NORMAL THROUGH THE PERIOD. SCHNEIDER
LONG TERM /FRIDAY THROUGH MONDAY/
A WEAK UPPER TROUGH WILL
LINGER OVER THE AREA FRIDAY AND POSSIBLY INTO SATURDAY WITH SOME
WRAP AROUND MOISTURE AND INSTABILITY FOR A SLIGHT CHANCE OF
SHOWERS. THERE MIGHT BE A DRY 12-24 HOUR PERIOD LATER SATURDAY
INTO SUNDAY BUT IT'S HARD TO COMPLETELY RULE OUT A FEW SHOWERS FOR
NOW GIVEN THE UNCERTAINTY AND SPREAD IN THE LONG RANGE MODELS. IT
LOOKS A BIT WETTER SUNDAY NIGHT AND MONDAY AS A PACIFIC WEATHER
SYSTEM REACHES THE AREA BUT NOTHING OUT OF THE ORDINARY FOR THIS
TIME OF YEAR. SCHNEIDER
AVIATION
RAIN WILL CONTINUE TO SPREAD ACROSS THE REGION THIS
EVENING, BECOMING SHOWERY IN NATURE TUESDAY MORNING. CIGS WILL VARY
FROM VFR TO MVFR AT TIMES OVERNIGHT INTO TUESDAY MORNING IN MANY
LOCATIONS. CIGS WILL BEGIN TO BREAK UP DURING THE DAY TUESDAY.
GENERALLY LIGHT SOUTHERLY OR VARIABLE WINDS ARE EXPECTED AHEAD OF
THE FRONT, WITH INCREASING SOUTHERLY FLOW FOLLOWING THE FRONT WITH A
BRIEF PERIOD OF SUSTAINED WINDS 15-20 KTS AND GUSTS NEAR 25 KTS
POSSIBLE. WINDS WILL DECREASE THROUGH THE DAY TUESDAY.
KSEA...MVFR CONDITIONS THROUGH THIS EVENING. RAIN WILL BECOME SPOTTY
IN NATURE FOLLOWING 05Z. MVFR CIGS APPEAR LIKELY OVERNIGHT INTO
TUESDAY FOLLOWING THE FRONT, GRADUALLY BREAKING UP BY LATE MORNING.
LIGHT SOUTHERLY WINDS WILL INCREASE FROM THE S/SW WITH THE FRONT
BETWEEN 05-06Z THIS EVENING, WINDS ARE MOST LIKELY TO PEAK AT 15-20
KTS WITH GUSTS TO AROUND 25 KTS BEFORE SETTLING TO 10-15 KTS THROUGH
THE REMAINDER OF THE NIGHT AND DECREASING FURTHER DURING THE
AFTERNOON.
-WOLCOTT-
MARINE
ONSHORE WINDS WILL CONTINUE THROUGH TONIGHT AS A FRONTAL
SYSTEM PUSHES THROUGH THE AREA AND AN AREA OF LOW PRESSURE LINGERS
OFF THE COAST. SMALL CRAFT WINDS WILL DIMINISH FOR THE STRAIT
DURING THE EVENING HOURS AND CONTINUE FOR THE COASTAL WATERS
THROUGH TONIGHT. WINDS WILL TRANSITION TO SOUTHERLY THIS EVENING
ALONG THE INTERIOR WATERS, WITH SMALL CRAFT WINDS INTO TUESDAY.
WINDS WILL LIKELY TURN OFFSHORE TUESDAY NIGHT INTO WEDNESDAY WITH
AN AREA OF LOW PRESSURE LOCATED OFF OF THE OREGON COAST. JD
HYDROLOGY
RIVER FLOODING IS NOT EXPECTED FOR THE NEXT 7 DAYS.
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...SMALL CRAFT ADVISORY UNTIL 5 AM PDT TUESDAY FOR COASTAL WATERS
FROM CAPE FLATTERY TO JAMES ISLAND 10 TO 60 NM-COASTAL
WATERS FROM CAPE FLATTERY TO JAMES ISLAND OUT 10 NM-COASTAL
WATERS FROM JAMES ISLAND TO POINT GRENVILLE 10 TO 60 NM-
COASTAL WATERS FROM JAMES ISLAND TO POINT GRENVILLE OUT 10
NM-COASTAL WATERS FROM POINT GRENVILLE TO CAPE SHOALWATER
10 TO 60 NM-COASTAL WATERS FROM POINT GRENVILLE TO CAPE
SHOALWATER OUT 10 NM.
SMALL CRAFT ADVISORY UNTIL 2 PM PDT TUESDAY FOR ADMIRALTY INLET-
EAST ENTRANCE U.S. WATERS STRAIT OF JUAN DE FUCA-NORTHERN
INLAND WATERS INCLUDING THE SAN JUAN ISLANDS-PUGET SOUND
AND HOOD CANAL.
WWW.WEATHER.GOV/SEATTLE
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