Full Notification

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PORTLAND OR
1026 AM PDT WED AUG 26 2015

...THE FIRST SUBSTANTIAL RAIN IN QUITE SOME TIME EXPECTED OVER SOUTHWEST WASHINGTON AND NORTHWEST OREGON LATE THIS WEEK AND ESPECIALLY THIS WEEKEND...

A BIG CHANGE IN THE WEATHER IS EXPECTED OVER SOUTHWEST WASHINGTON AND NORTHWEST OREGON AS THE FIRST SUBSTANTIAL RAIN IS EXPECTED OVER THE AREA LATE THIS WEEK AND THIS WEEKEND.

THIS COULD BE THE MOST RAIN MOST AREAS IN SOUTHWEST WASHINGTON AND NORTHWEST OREGON HAVE SEEN SINCE MARCH. RAINFALL ACCUMULATIONS THROUGH THE WEEKEND COULD EXCEED AN INCH OR POSSIBLY EVEN 1.5 OR 2 INCHES ALONG MUCH OF THE COAST INTO THE SOUTH WASHINGTON CASCADES...WITH 0.75 TO 1.5 INCHES IN THE OREGON CASCADES AND 0.5 INCHES OR HIGHER IN THE VALLEYS.

THE RAIN WILL BE PRODUCED BY THE LOW PRESSURE SYSTEM CURRENTLY LOCATED OFF THE COAST AS IT MOVES ONSHORE AND INLAND INTO THE PACIFIC NORTHWEST. THIS SYSTEM WILL BE PICKING UP SUBSTANTIAL MOISTURE...SOME OF IT OF TROPICAL ORIGINS...AND SPREADING IT ACROSS OUR AREA BENEATH A 110 KNOT UPPER LEVEL JET. THE FIRST MAIN PERIOD OF THE HEAVIEST RAIN WILL BE FRIDAY NIGHT INTO SATURDAY...BUT A SECOND SYSTEM WILL ADD TO THE RAINFALL TOTALS SATURDAY NIGHT INTO SUNDAY.

IF ALL OF THIS COMES TOGETHER AS EXPECTED...THIS RAIN WILL LIKELY EASE THE DRY FIRE CONDITIONS DRAMATICALLY OVER SOUTHWEST WASHINGTON AND NORTHWEST OREGON FOR AT LEAST THE NEXT WEEK OR TWO.