932  
FXUS66 KSEW 081746  
AFDSEW  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SEATTLE WA  
1046 AM PDT TUE JUL 8 2025  
   
SYNOPSIS  
WARM AND DRY CONDITIONS WILL PERSIST TODAY UNDER HIGH  
PRESSURE. A WEAK SYSTEM WILL CROSS THE REGION ON WEDNESDAY,  
BRINGING LIGHT RAIN AND COOLER TEMPERATURES. HIGH PRESSURE WILL  
REBOUND TOWARDS THE END OF THE WEEK, BRINGING A RETURN OF WARMER  
AND DRY CONDITIONS BY FRIDAY AND INTO EARLY NEXT WEEK.  
 
 
   
SHORT TERM /TODAY THROUGH THURSDAY/  
FORECAST ON TRACK THIS  
MORNING. SATELLITE IMAGERY SHOWS NEXT FRONTAL SYSTEM NOW  
APPROACHING THE NORTHERN TIP OF VANCOUVER ISLAND. HIGH CLOUDS OUT  
AHEAD OF THE SYSTEM WILL BEGIN MOVING OVER THE NORTHWEST PORTION  
OF THE STATE THIS AFTERNOON. OUTSIDE OF A PATCH OF STRATUS ALONG  
THE COAST SUNNY SKIES FOR THE REMAINDER OF THE AREA. HIGHS  
SIMILAR TO MONDAY WITH A COUPLE OF DEGREES OF COOLING POSSIBLE  
AS THE SURFACE WINDS REMAINING SOUTHWESTERLY. HIGHS FOR THE  
INTERIOR IN THE MID 70S TO MID 80S. HIGHS ALONG THE COAST IN THE  
60S. IT IS ANOTHER DAY OF MODERATE (ORANGE) HEATRISK TO MOST METRO  
AREAS SURROUNDING THE PUGET SOUND, WITH MINOR (YELLOW) HEATRISK  
ELSEWHERE.  
 
PREVIOUS DISCUSSION FOLLOWS...CLOUDY SKIES WILL FILL IN THIS  
EVENING AS THE NEXT SYSTEM APPROACHES.  
 
THE APPROACHING DISTURBANCE WILL BRING A SIGNIFICANT COOL DOWN ON  
WEDNESDAY AS A STRONG PUSH OF MARINE AIR MOVES INTO THE REGION.  
LIGHT RAIN WILL SPREAD INLAND THROUGHOUT THE DAY WEDNESDAY, WITH  
THE BULK OF THE MOISTURE FOCUSED OVER THE CASCADES, WHERE  
GENERALLY UP TO HALF AN INCH OF RAIN IS POSSIBLE THROUGH THURSDAY  
MORNING. AREAS IN THE NORTH CASCADES MAY SEE LOCALLY HIGHER  
RAINFALL AMOUNTS CLOSER TO AN INCH. ELSEWHERE, LOWER ELEVATIONS  
WILL SEE LIGHT ACCUMULATIONS, GENERALLY RANGING FROM A FEW  
HUNDREDTHS TO A QUARTER OF AN INCH. THE MOIST MARINE AIR WILL COOL  
TEMPERATURES CONSIDERABLY, WITH HIGHS WEDNESDAY PEAKING IN THE  
MID TO UPPER 60S FOR MOST LOWLAND AREAS.  
 
CONDITIONS WILL DRY OUT BY THE LATE MORNING THURSDAY AS HIGH  
PRESSURE STARTS TO BUILD INLAND, WITH CLOUDY SKIES IN THE MORNING  
CLEARING BY THE AFTERNOON. TEMPERATURES WILL REBOUND SEVERAL  
DEGREES AND RETURN TO NEAR NORMAL, WITH MOST OF THE INTERIOR  
SEEING HIGHS IN THE LOW TO MID 70S.  
   
LONG TERM /FRIDAY THROUGH MONDAY/  
ENSEMBLES REMAIN IN GOOD  
AGREEMENT OVER HIGH PRESSURE BUILDING INTO THE REGION OVER THE  
WEEKEND AND INTO EARLY NEXT WEEK. FRIDAY WILL BRING A RETURN OF  
WARM AND DRY CONDITIONS ACROSS WESTERN WASHINGTON, WITH WIDESPREAD  
AREAS OF MINOR (YELLOW) HEATRISK ACROSS THE LOWLANDS AND HIGHS  
RETURNING INTO THE 80S EAST AND SOUTH OF THE PUGET SOUND.  
TEMPERATURES WILL CONTINUE TO WARM UP THROUGH THE WEEKEND AS A  
RIDGE OFFSHORE AMPLIFIES. THIS WILL GIVE ANOTHER POTENTIAL  
PERIOD OF INCREASED HEATRISK AS WELL AS AN INCREASE IN FIRE  
WEATHER CONCERNS OVER THE WEEKEND AND INTO THE START OF NEXT  
WEEK.  
 
15/FELTON  
 
 
   
AVIATION.  
WIDESPREAD VFR CONDITIONS ACROSS THE INTERIOR  
TERMINALS THIS MORNING. THE MARINE STRATUS IS EXPECTED TO REMAIN  
CONFINED TO THE PACIFIC COAST THIS MORNING, WITH CEILINGS DROPPING  
TO IFR/LIFR AND POTENTIAL FOR VISIBILITIES TO ALSO DROP IN THESE  
CATEGORIES, WITH IMPROVEMENT NOT EXPECTED TODAY.  
 
THE REMAINDER OF TODAY STAYS DRY WITH HIGH CLOUDS (MARINE STRATUS  
WILL LINGER THE LONGEST ALONG THE COAST WITH ONLY A BRIEF BREAK TO  
MVFR/VFR EXPECTED THIS AFTERNOON). THE NEXT DISTURBANCE  
TONIGHT/WEDNESDAY MORNING WILL BRING SHOWERS ACROSS ALL TERMINALS,  
WITH CEILINGS LOWERING TO MVFR AND WIDESPREAD POCKETS OF IFR  
WEDNESDAY MORNING. SOUTHWEST SURFACE FLOW WITH WINDS RANGING 8-13 KT  
(COUPLE GUSTS TO 20 KT POSSIBLE). ANOTHER PUSH THROUGH THE STRAIT OF  
JUAN DE FUCA THIS AFTERNOON MAY CAUSE SOME DIFFLUENCE AND TURN WINDS  
NORTHERLY DOWN TO KBFI.  
 
KSEA...VFR CONDITIONS EXPECTED ALL OF TUESDAY, WITH A 70% CHANCE OF  
MVFR (20% CHANCE OF IFR) WEDNESDAY MORNING - GENERALLY AFTER 12Z.  
CLEAR SKIES TODAY WITH INCREASING CLOUD COVERAGE LATER TODAY WITH  
SHOWERS LIKELY AFTER 12Z WEDNESDAY. SOUTHWESTERLY WINDS AT 7-11 KT,  
WITH A COUPLE GUSTS TO 18 KT POSSIBLE). THE NORTHWESTERLY WINDS ARE  
EXPECTED AT THIS TIME TO HOLD TO THE NORTH OF KSEA (DOWN TO KBFI),  
WITH RATHER WINDS BECOMING MORE WESTERLY-SOUTHWESTERLY.  
 
HPR  
 
 
   
MARINE  
WINDS ALONG THE STRAIT OF JUAN DE FUCA ALONG THE CENTRAL  
AND EASTERN PORTIONS CONTINUE TO DECREASE THIS MORNING, AND THE  
SMALL CRAFT ADVISORY WILL BE ALLOWED TO EXPIRE AT 9 AM PDT. MUCH OF  
COASTAL WATERS AND THE STRAIT OF JUAN DE FUCA HAVE MARINE STRATUS  
AND/OR FOG COVERING MUCH OF THESE WATERS, WHICH MAY LIMIT  
VISIBILITIES AT TIMES THROUGH THIS MORNING.  
 
A TROUGH OVER THE COASTAL WATERS WILL BRING A WEAK FRONTAL SYSTEM  
ACROSS THE COASTAL WATERS TUESDAY NIGHT INTO WEDNESDAY WITH SHOWERS.  
THERE IS A SMALL POSSIBILITY THAT SEAS COULD BRIEFLY UPTICK. PUSHES  
THROUGH THE STRAIT OF JUAN DE FUCA WILL CONTINUE THROUGH MUCH OF THE  
WEEK, WITH ANOTHER STRONG PUSH LIKELY AGAIN TUESDAY  
AFTERNOON/EVENING. OPTED TO ISSUE ANOTHER SMALL CRAFT ADVISORY FOR  
THE EAST/CENTRAL STRAIT OF JUAN DE FUCA ZONES (ESPECIALLY WITH THE  
FRONT MOVING THROUGH AND INCREASING ONSHORE FLOW). ANOTHER WEAK LOW  
MAY PASS THE WATERS THURSDAY. HIGH PRESSURE WILL BUILD OFFSHORE  
FRIDAY INTO THE WEEKEND.  
 
SEAS ARE EXPECTED TO HOLD BETWEEN 3-6 FT THROUGH MUCH OF THE WEEK  
AND COULD BECOME STEEP AT TIMES WITH PERSISTENT NORTHERLY WINDS OVER  
THE COASTAL WATERS.  
 
HPR  
 
 
   
FIRE WEATHER  
DRY, WARM WEATHER WILL LEAD TO ELEVATED FIRE WEATHER  
CONDITIONS TODAY WITH HIGH PRESSURE SITUATED ACROSS WESTERN  
WASHINGTON. CONDITIONS ARE ON TRACK DRY OUT THIS AFTERNOON WITH  
MINIMUM RH VALUES DROPPING TOWARDS 25% TO 35% OVER THE MOUNTAINS AND  
THROUGH THE CASCADE FOOTHILLS AND VALLEYS. A FEW WIND GUSTS UP TO  
AROUND 20 MPH MAY BE POSSIBLE ACROSS PORTIONS OF THE SOUTHWEST  
INTERIOR ALONG THE SOUTHERN SLOPES OF THE OLYMPICS AS WELL AS THROUGH  
THE STRAIT OF JUAN DE FUCA.  
 
A WEAK FRONTAL SYSTEM WILL MOVE ACROSS WESTERN WASHINGTON TONIGHT  
INTO WEDNESDAY. THIS WILL INCREASE ONSHORE FLOW, WITH MUCH COOLER  
TEMPERATURES AND INCOMING PRECIPITATION FOR SOME AREAS TONIGHT  
THROUGH WEDNESDAY. THERE REMAINS A MODERATE (50% TO 70%) CHANCE OF  
WETTING RAIN FOR THE CASCADES OF SNOHOMISH COUNTY NORTHWARDS, WITH  
LIGHTER RAINFALL AMOUNTS ELSEWHERE.  
 
UPPER RIDGING WILL THEN BUILD BACK INTO WESTERN WASHINGTON LATE  
THURSDAY AND CONTINUE INTO NEXT WEEKEND, RESULTING IN THE RETURN OF  
WARM, DRY WEATHER AND ELEVATED FIRE WEATHER CONDITIONS. FRIDAY WILL  
BE THE DRIEST DAY OF THE PERIOD, WITH RH VALUES DROPPING INTO THE  
25% TO 35% RANGE OVER THE MOUNTAINS AND ACROSS THE LOWLANDS SOUTH OF  
THE PUGET SOUND. DRY CONDITIONS LOOK TO PERSIST INTO NEXT WEEK BUT  
THE DETAILS REMAIN UNCERTAIN AT THIS POINT.  
 
15/62  
 
 
   
SEW WATCHES/WARNINGS/ADVISORIES  
 
WA...NONE.  
PZ...SMALL CRAFT ADVISORY FROM 2 PM THIS AFTERNOON TO 10 PM PDT THIS  
EVENING FOR CENTRAL U.S. WATERS STRAIT OF JUAN DE FUCA-EAST  
ENTRANCE U.S. WATERS STRAIT OF JUAN DE FUCA.  
 
 
 
 
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