905
FXUS66 KSEW 210334
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
834 PM PDT SAT JUL 20 2019
SYNOPSIS
WARM AND DRY WEATHER RETURNS FOR SUNDAY. A WEAK
WEATHER SYSTEM WILL BRING COOLER TEMPERATURES LATER TUESDAY INTO
WEDNESDAY BEFORE HIGH PRESSURE REBUILDS OVER THE REGION FOR WARMER
AND DRIER CONDITIONS THURSDAY AND FRIDAY.
SHORT TERM /TONIGHT THROUGH TUESDAY/
AN UPPER RIDGE WILL SHIFT
INLAND SUNDAY BUT UPPER HEIGHTS WILL ACTUALLY RISE ACROSS WESTERN
WASHINGTON FOR A SUNNY AND WARMER DAY. HIGHS SHOULD BE MOSTLY IN
THE 80S FOR THE INTERIOR AND 70S ELSEWHERE.
AN UPPER TROUGH AROUND 135W WILL SLOWLY SHIFT EAST ON MONDAY. THE
MAIN AFFECT WILL BE TO INCREASE LOW LEVEL ONSHORE FLOW FOR THE
AREA. THIS WILL COOL HIGHS SEVERAL DEGREES AND BRING SOME MORNING
CLOUDS TO THE COAST AND PARTIALLY INLAND OVER THE SOUTHWEST
INTERIOR.
THE UPPER TROUGH WILL MOVE TO THE COAST ON TUESDAY. THE COOLING
TREND WILL CONTINUE WITH HIGHS BACK TO NEAR NORMAL. LOW CLOUDS
SHOULD COVER MOST OF THE LOWLAND TUESDAY MORNING THEN BURN BACK
TO THE COAST IN THE AFTERNOON. THERE WILL ALSO BE A SLIGHT CHANCE
OF SHOWERS LATE IN THE DAY AND INTO TUESDAY NIGHT AS THE UPPER
TROUGH MOVES OVERHEAD AND THE AIR MASS BECOMES A BIT UNSTABLE.
SCHNEIDER
LONG TERM /WEDNESDAY THROUGH SATURDAY/
PREVIOUS
DISCUSSION...ONSHORE FLOW WILL PREVAIL THROUGH THE REST OF THE
WEEK AND INTO THE WEEKEND. THE FORECAST IS LOOKING DRY WITH WEAK
RIDGING OVER THE REGION. WE'LL LIKELY SEE MORNING LOW LEVEL
STRATUS CLOUDS WITH SUNBREAKS IN THE AFTERNOON. TEMPERATURES
THROUGH THE PERIOD ARE CLOSE TO NORMAL. 33
AVIATION
AN UPPER RIDGE OVER THE AREA WILL SHIFT INLAND
TONIGHT AND SUNDAY WITH AN OFFSHORE UPPER TROUGH APPROACHING. AT
THE SURFACE, WEAK ONSHORE FLOW WILL CONTINUE. THE AIR MASS IS DRY
AND STABLE.
KSEA...CLEAR SKIES. NORTHERLY WIND 5-10 KNOTS. SCHNEIDER
MARINE
WEAK ONSHORE FLOW WILL PREVAIL THROUGH SUNDAY. ONSHORE
FLOW WILL INCREASE EARLY NEXT WEEK AND CONTINUE THROUGH THE MIDDLE
OF THE WEEK. SMALL CRAFT ADVISORY STRENGTH WEST WINDS ARE LIKELY
EACH NIGHT FOR THE CENTRAL AND EASTERN STRAIT OF JUAN DE FUCA.
SCHNEIDER
HYDROLOGY
THE DAILY HYDROLOGY DISCUSSION HAS ENDED UNTIL THE
START OF THE NEXT RAINY SEASON; IT WILL ONLY BE UPDATED AS NEEDED
UNTIL THEN.
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...SMALL CRAFT ADVISORY FROM 5 PM SUNDAY TO 5 AM PDT MONDAY 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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