Hydrologic Outlook

HYDROLOGIC OUTLOOK
WAC009-027-031-033-041-045-053-057-061-067-073-200000-

HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE SEATTLE WA
132 PM PST THU DEC 18 2014

...HEAVY RAIN COULD CAUSE FLOODING BY LATE THIS WEEKEND...

HEAVY RAIN IS FORECAST OVER WESTERN WASHINGTON SATURDAY AND
SUNDAY. STRONG WESTERLY FLOW ALOFT WILL BRING HEAVY RAIN AT TIMES
TO THE COAST AND OLYMPICS ON SATURDAY. HEAVY RAIN WILL SPREAD
INTO THE CASCADES SATURDAY AFTERNOON. MODELS CURRENTLY TAPER RAIN
OVER THE OLYMPICS ON SUNDAY BUT KEEP HEAVY RAIN GOING IN THE
CASCADES...ESPECIALLY OVER THE CASCADES FROM ABOUT KING COUNTY
SOUTH. THE TOTAL MODEL RAINFALL OVER ABOUT 48 HOURS FROM SATURDAY
MORNING THROUGH SUNDAY NIGHT AMOUNTS TO AROUND FOUR TO SIX INCHES
OVER THE OLYMPICS AND CENTRAL CASCADES WITH A TEN-INCH BULLSEYE
OVER MOUNT RAINIER.

THESE RAINFALL AMOUNTS ARE ENOUGH TO CAUSE FLOODING. AT THIS TIME
THE RIVERS MOST LIKELY TO FLOOD ARE THE ONES FLOWING OFF THE
CASCADES OF KING...PIERCE...AND LEWIS COUNTIES...AS WELL AS THE
UNUSUALLY FLOOD-PRONE SKOKOMISH RIVER IN MASON COUNTY. ANY FLOODING
WOULD LIKELY BEGIN SUNDAY WITH CRESTS SUNDAY NIGHT OR MONDAY. THE
EXACT POSITION OF THE STREAM OF MOISTURE IS UNCERTAIN SO THIS
OUTLOOK COVERS THE ENTIRE OLYMPIC PENINSULA AND ALL OF THE
CASCADES RIVERS.

$$