By Rod Hill on 2010-12-11
.A MOIST STORM SYSTEM AND WARM FRONT WILL BRING HEAVY RAIN TO MUCH OF NORTHWEST OREGON AND SOUTHWEST WASHINGTON ON SATURDAY... WITH ADDITIONAL PERIODS OF HEAVY RAIN ON SUNDAY AND MONDAY. ON SATURDAY...THE HEAVIEST RAIN IS LIKELY TO BE IN THE NORTH OREGON COAST RANGE...WILLAPA HILLS...AND SOUTH WASHINGTON CASCADES...WITH 6-HOUR AMOUNTS AS HIGH AS 3 INCHES AND 24-HOUR AMOUNTS AS HIGH AS 6 INCHES. THERE IS AN EXPECTED BREAK IN THE RAINFALL ON SUNDAY... AND THEN ANOTHER FRONT WILL BRING ADDITIONAL RAINFALL FROM SUNDAY EVENING THROUGH MONDAY. FREEZING LEVELS WILL BE ABOVE 6000 FEET FROM MID-DAY SATURDAY THROUGH MONDAY. MANY RIVERS WILL RISE SHARPLY SATURDAY...WITH FLOODING POSSIBLY AS EARLY AS LATE SATURDAY AFTERNOON. FLOODING OF CREEKS AND PONDING IN URBAN AREAS IS ALSO LIKELY.
* HEAVY RAIN SATURDAY WILL DRIVE RIVER LEVELS UP SHARPLY STARTING SATURDAY AFTERNOON AND INTO SUNDAY. * SEVERAL RIVERS MAY REACH FLOOD STAGE AS EARLY AS SATURDAY AFTERNOON...WITH THE FLOOD THREAT CONTINUING INTO MONDAY. SOUTHWEST WASHINGTON RIVERS OF MOST CONCERN INCLUDE... THE GRAYS RIVER IN WAHKIAKUM COUNTY THE COWLITZ RIVER IN COWLITZ COUNTY NORTHWEST OREGON RIVERS OF MOST CONCERN INCLUDE... NEHALEM RIVER IN TILLAMOOK COUNTY WILSON RIVER IN TILLAMOOK COUNTY TRASK RIVER IN TILLAMOOK COUNTY SILETZ RIVER IN LINCOLN COUNTY UPPER TUALATIN RIVER IN WASHINGTON COUNTY LUCKIAMUTE RIVER IN POLK AND BENTON COUNTIES JOHNSON CREEK IN MULTNOMAH COUNTY PUDDING RIVER IN CLACKAMAS AND MARION COUNTIES
Weekend Rains May Push Rivers To Flood Stage