736
FXUS66 KSEW 072134
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
234 PM PDT THU MAY 7 2026
SYNOPSIS
HIGH PRESSURE WILL SLOWLY SHIFT INLAND OVER WESTERN WASHINGTON
TODAY AHEAD OF A WEAK AND MOSTLY DRY FRONTAL SYSTEM THAT WILL
SWING INLAND ON FRIDAY. HIGH PRESSURE WILL REBOUND OVER THE
WESTERN US OVER THE WEEKEND AND INTO NEXT WEEK, BRINGING DRIER
AND WARMER CONDITIONS TO THE REGION. CHANCES FOR LIGHT RAIN WILL
INCREASE TOWARDS THE MIDDLE OF NEXT WEEK AS AN UPPER LOW DROPS
FROM THE GULF OF ALASKA.
SHORT TERM /TONIGHT THROUGH SATURDAY NIGHT/
SATELLITE IMAGERY THIS AFTERNOON SHOWS WIDESPREAD STRATUS
GENERALLY NORTH OF TACOMA HOLDING STRONG, WHILE AREAS ALONG THE
COAST AND ACROSS THE SOUTH SOUND HAVE ERODED OUT OF THE CLOUDS
FOR NOW. AS HIGH PRESSURE SLOWLY SHIFTS INLAND TODAY INTO
TOMORROW, ONSHORE FLOW WILL KEEP CLOUDS PRESENT FOR MUCH OF THE
AREA, LIMITING MOST HIGH TEMPERATURES ACROSS THE AREA TO THE
60S. AREAS THAT HAVE BROKEN OUT OF THE CLOUDS MAY SEE
TEMPERATURES PEAK CLOSER TO 70 DEGREES LATER THIS AFTERNOON, BUT
CONFIDENCE REMAINS LOW OVER HOW MUCH OF THE MARINE STRATUS
LAYER WILL ERODE THIS AFTERNOON. ANOTHER ROUND OF STRATUS IS
EXPECTED TO EXPAND INLAND OVER THE REGION TONIGHT AS ONSHORE
FLOW CONTINUES.
A WEAK, DISSIPATING FRONTAL SYSTEM WILL APPROACH THE REGION ON
FRIDAY, BRINGING LITTLE MORE THAN LIGHT RAIN ALONG THE PACIFIC
COAST AND POTENTIAL FOR DRIZZLE THROUGH THE STRATUS LAYER.
INCREASED ONSHORE FLOW FROM THIS WEAK SYSTEM WILL BRING EXTRA
CLOUD COVER THAT WILL LOWER TEMPERATURES A FEW DEGREES FROM
TODAY.
HIGH PRESSURE WILL QUICKLY REBOUND OVER THE WESTERN US ON
SATURDAY, BRINGING IN WARMER AND DRIER CONDITIONS WITH PLENTY
OF SUN BREAKS AND HIGHS IN THE UPPER 60S TO MID 70S.
LONG TERM /SUNDAY THROUGH THURSDAY/
ENSEMBLES REMAIN IN GOOD AGREEMENT THAT HIGH PRESSURE WILL
REMAIN SITUATED OVER THE WESTERN US THROUGH MONDAY, BUT MODELS
BEGIN SHOWING A LARGE VARIANCE IN SOLUTIONS LATER TUESDAY AND
BEYOND. A WEAK SYSTEM ALONG THE PERIPHERY OF THE RIDGE WILL
BRING IN EXTRA CLOUD COVER ON SUNDAY ALONGSIDE A SLIGHT CHANCE
FOR RAIN ALONG THE NORTHERN COAST, WITH HIGHS MOSTLY TOPPING OUT
BELOW 70 DEGREES. THE RIDGE WILL BUILD BACK INTO WESTERN
WASHINGTON ON MONDAY, ALLOWING FOR SUNNY SKIES AND HIGHS IN THE
UPPER 60S TO MID 70S. CONDITIONS WILL WARM A FEW DEGREES INTO
TUESDAY AS HIGH PRESSURE MAINTAINS WARM AND DRY CONDITIONS
ACROSS WESTERN WASHINGTON.
ENSEMBLES STRUGGLE TO DEPICT THE TRACK OF A LOW PRESSURE SYSTEM
MID WEEK, WITH SOME MEMBERS BRINGING THE TROUGH ONSHORE ACROSS
THE PACIFIC NORTHWEST WHILE OTHER MEMBERS HAVE THE LOW STALLING
OFFSHORE. TEMPERATURES LOOK TO REMAIN WARM, BUT THE UPPER TROUGH
MAY START TO REINTRODUCE SOME LIGHT PRECIPITATION CHANCES TO
PORTIONS OF THE AREA.
15
AVIATION
HIGH PRESSURE WILL SHIFT INLAND TONIGHT WITH DRY AND STABLE
CONDITIONS. LOW CLOUDS CONTINUE TO SCATTER WITH VFR CONDITIONS
EXPECTED. A WEAK TROUGH WILL PASS THROUGH WESTERN WA ON FRIDAY
WITH INCREASING S/SW WINDS 10-15 KT 18-00Z.
KSEA...VFR CONDITIONS TONIGHT WITH S/SW WIND AROUND 5 KT. SW
WINDS INCREASING TO 10-15 KT 18Z FRIDAY.
MARINE
LIGHT ONSHORE FLOW TONIGHT. A WEAK FRONT WILL CROSS THE WATERS
ON FRIDAY. HIGH PRESSURE WILL REBUILD THIS WEEKEND FOR ONSHORE
FLOW. SCA WINDS POSSIBLE THROUGH THE STRAIT OF JUAN DE FUCA
DURING THE AFTERNOON AND EVENING HOURS.
33
HYDROLOGY
THE DAILY HYDROLOGY DISCUSSION HAS ENDED UNTIL THE START OF THE NEXT
RAINY SEASON; IT WILL ONLY BE UPDATED DURING THIS TIME AS NEEDED.
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...NONE.
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