532
FXUS66 KSEW 062200
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
300 PM PDT MON APR 6 2020
SYNOPSIS
UPPER LEVEL RIDGING ACROSS THE NORTHEASTERN PACIFIC
WILL REMAIN THE DOMINANT INFLUENCE ACROSS THE REGION OVER THE NEXT
SEVERAL DAYS, KEEPING WESTERN WASHINGTON DRY. TEMPERATURES WILL
WARM THROUGH THURSDAY AND CHANCES OF RAIN WILL INCREASE LATE IN
THE WEEK AND INTO THE WEEKEND AS A WEAK SYSTEM BRUSHES THROUGH
THE REGION.
SHORT TERM /TONIGHT THROUGH THURSDAY/
CURRENT SATELLITE IMAGERY
SHOWS SOME SCATTERED CUMULUS PRESENT ACROSS THE MOUNTAINS THIS
AFTERNOON. HIGH LEVEL CLOUDS HAVE ALSO STARTED TO INCREASE ACROSS
THE REGION THIS AFTERNOON ASSOCIATED WITH A FRONTAL SYSTEM MOVING
INTO BRITISH COLUMBIA. EXPECT THE REGION TO REMAIN DRY, WITH
HIGHS CURRENTLY IN THE MID TO UPPER 50S, WITH A FEW SPOTS HITTING
THE LOW 60S ACROSS THE SOUTHERN INTERIOR.
WITH UPPER LEVEL RIDGING REMAINING THE DOMINANT INFLUENCE ACROSS
THE REGION THIS WEEK, WESTERN WASHINGTON WILL REMAIN DRY AND
TEMPERATURES WILL GRADUALLY WARM. AS ONSHORE FLOW INCREASES ACROSS
THE REGION TONIGHT, COULD SEE STRATUS MAKE ITS WAY INTO PORTIONS
OF THE SOUND OVERNIGHT TONIGHT. STRATUS THAT DOES MAKE ITS WAY
INLAND WILL RETREAT AND DISSIPATE BY THE AFTERNOON HOURS FOR A
DOSE OF AFTERNOON SUN ON TUESDAY. HIGHS WILL BE IN THE MID TO
UPPER 50S ACROSS MUCH OF THE LOWLANDS.
TEMPERATURES WILL CONTINUE TO WARM A FEW DEGREES ON WEDNESDAY AND
THURSDAY, WITH THURSDAY STILL LOOKING TO BE THE WARMEST DAY OF
THE WEEK WITH HIGHS CLIMBING INTO THE LOW TO MID 60S ACROSS
ACROSS THE SOUTHERN AND CENTRAL SOUND.
LONG TERM /FRIDAY THROUGH MONDAY/
RAIN CHANCES INCREASE AGAIN
LATE THIS WEEK AND INTO THE WEEKEND AS A WEAK SYSTEM RIDES THE
PERIPHERY OF THE RIDGE AND QUICKLY TRAVERSES THE REGION. RECENT
RUNS OF THE DETERMINISTIC GFS AND ECMWF HAVE STARTED TO ALIGN A
BIT BETTER, MOSTLY HOLDING OFF ON THE BEST CHANCES OF PRECIPITATION
UNTIL SATURDAY. HOWEVER, THE GFS DOES STILL BRINGS SOME MOISTURE
INTO THE REGION ON FRIDAY, SO HAVE KEPT A CHANCE OF POPS IN THE
FORECAST, MOSTLY CONFINED TO HIGHER TERRAIN. OVERALL, ENSEMBLES
STILL HINT AT UPPER LEVEL RIDGING REMAINING THE DOMINANT WEATHER
FEATURE IN THE EXTENDED TIME FRAME-HINTING THAT CONDITIONS COULD
REMAIN DRIER. 14
AVIATION
NORTHWEST FLOW ALOFT CONTINUES AS UPPER RIDGING
GRADUALLY BUILDS INTO THE REGION. LOW LEVEL ONSHORE HAS DEVELOPED
TODAY AND WILL INCREASE SOMEWHAT THROUGH THIS EVENING. VFR EXPECTED
ACROSS THE REGION THROUGH THIS EVENING. SOME STRATUS IS POSSIBLE
NEAR THE COAST LATE TONIGHT AND MAY PUSH LOCALLY INLAND FOR AREAS OF
MVFR POSSIBLE TUESDAY A.M. ANY STRATUS SHOULD BURN OFF BY 19Z-21Z
TUESDAY AFTERNOON.
KSEA...VFR CONDITIONS THROUGH LATE TONIGHT. SOME STRATUS MAY REACH
THE TERMINAL BRIEFLY TUESDAY AM, BUT CONFIDENCE IN THIS OCCURRING IS
NOT HIGH. LIGHT WIND BECOME S-SW 5 TO 10 KNOTS FROM THIS EVENING
THROUGH THE OVERNIGHT HOURS. 27
MARINE
ONSHORE FLOW TODAY AS HIGH PRESSURE BUILDS OVER THE
AREA WITH SOLID ADVISORY LEVEL WESTERLIES EXPECTED IN THE CENTRAL
AND EASTERN STRAIT THIS EVENING. SURFACE RIDGING BUILDING OVER THE
INTERIOR OF BRITISH COLUMBIA WILL TURN THE FLOW OFFSHORE BY MIDWEEK,
BUT ONLY WEAKLY SO. ONSHORE FLOW RETURNS LATE IN THE WEEK, BUT DOES
NOT APPEAR TO BE ENOUGH FOR ADVISORY LEVEL WINDS AT THIS TIME. ALL
IN ALL, LOOKS LIKE A FAIRLY QUIET WEEK AHEAD ON AREA WATERS. 27
HYDROLOGY
NO RIVER FLOODING EXPECTED OVER THE NEXT 7 DAYS.
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...SMALL CRAFT ADVISORY FROM 5 PM THIS AFTERNOON TO 5 AM PDT
TUESDAY FOR CENTRAL U.S. WATERS STRAIT OF JUAN DE FUCA-EAST
ENTRANCE U.S. WATERS STRAIT OF JUAN DE FUCA.
WWW.WEATHER.GOV/SEATTLE
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