FLOOD WATCH NATIONAL WEATHER SERVICE PORTLAND OR 821 AM PST SAT DEC 20 2014 ORZ001>008-010>016-WAZ019>022-039-040-045-046-210600- /O.CON.KPQR.FA.A.0003.141221T0000Z-141223T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NORTH OREGON COAST-CENTRAL OREGON COAST- COAST RANGE OF NORTHWEST OREGON- CENTRAL COAST RANGE OF WESTERN OREGON-LOWER COLUMBIA- GREATER PORTLAND METRO AREA-CENTRAL WILLAMETTE VALLEY- SOUTH WILLAMETTE VALLEY-NORTHERN OREGON CASCADE FOOTHILLS- NORTHERN OREGON CASCADES-CASCADE FOOTHILLS IN LANE COUNTY- CASCADES IN LANE COUNTY-UPPER HOOD RIVER VALLEY- WESTERN COLUMBIA RIVER GORGE-CENTRAL COLUMBIA RIVER GORGE- SOUTH WASHINGTON CASCADES-WILLAPA HILLS-SOUTH WASHINGTON COAST-I- 5 CORRIDOR IN COWLITZ COUNTY-GREATER VANCOUVER AREA- SOUTH WASHINGTON CASCADE FOOTHILLS- INCLUDING THE CITIES OF...ASTORIA...CANNON BEACH...TILLAMOOK... NETARTS...PACIFIC CITY...LINCOLN CITY...NEWPORT... CAPE FOULWEATHER...YACHATS...FLORENCE...VERNONIA...JEWELL... SUNSET SUMMIT...LEES CAMP...TRASK...GRANDE RONDE...BURNT WOODS... TIDEWATER...SWISSHOME...VENETA...ST. HELENS...CLATSKANIE... HILLSBORO...PORTLAND...WILSONVILLE...OREGON CITY...GRESHAM... TROUTDALE...SALEM...MCMINNVILLE...WOODBURN...STAYTON...DALLAS... EUGENE...SPRINGFIELD...CORVALLIS...ALBANY...SANDY...ESTACADA... SILVER FALLS STATE PARK...SWEET HOME...GOVERNMENT CAMP... DETROIT...SANTIAM PASS...VIDA...JASPER...LOWELL...COTTAGE GROVE... MCKENZIE PASS...MCKENZIE BRIDGE...OAKRIDGE...WILLAMETTE PASS... PARKDALE...ODELL...CORBETT...ROOSTER ROCK...MULTNOMAH FALLS... CASCADE LOCKS...HOOD RIVER...COLDWATER RIDGE VISITORS CENTER... MOUNT ST. HELENS...WIND RIVER VALLEY...WILLAPA...FRANCES... ELK MOUNTAIN...RYDERWOOD...RAYMOND...LONG BEACH...OCEAN PARK... NASELLE...CATHLAMET...CAPE DISAPPOINTMENT...LONGVIEW...KELSO... CASTLE ROCK...VANCOUVER...BATTLE GROUND...RIDGEFIELD... WASHOUGAL...YACOLT...AMBOY...TOUTLE...ARIEL...LAKE MERWIN... YALE LAKE...COUGAR...CARSON...STEVENSON...UNDERWOOD 821 AM PST SAT DEC 20 2014 ...FLOOD WATCH REMAINS IN EFFECT FROM 4 PM PST THIS AFTERNOON THROUGH MONDAY AFTERNOON FOR SOUTHWEST WASHINGTON AND NORTHWEST OREGON... THE FLOOD WATCH CONTINUES FOR SOUTHWEST WASHINGTON AND NORTHWEST OREGON FROM 4 PM PST THIS AFTERNOON THROUGH MONDAY AFTERNOON. A CLASSIC ATMOSPHERIC RIVER TYPE PRECIPITATION EVENT IS SETTING UP OVER THE PACIFIC NORTHWEST TODAY...WHICH WILL CONTINUE TO IMPACT THE REGION INTO EARLY MONDAY. A VERY LONG FETCH OF MOISTURE WITH ORIGINS WEST TO THE SOUTH CHINA SEA IS FEEDING INTO THIS SYSTEM...BRINGING THE POTENTIAL FOR VERY LARGE RAINFALL TOTALS ACROSS THE REGION. A DEEP AND MOIST WESTERLY FLOW WILL DEVELOP TODAY AND CONTINUE THROUGH SUNDAY. WITH THE FLOW FORECASTED TO REMAIN PERPENDICULAR TO THE COAST RANGE AND CASCADES FOR AN EXTENDED PERIOD OF TIME...EXPECT STRONG OROGRAPHIC ENHANCEMENT TO LEAD TO THE HIGHEST RAINFALL TOTALS OVER THE MOUNTAINS. THE COAST RANGE...FOOTHILLS AND CASCADES ARE EXPECTED TO SEE IN THE RANGE OF 6 TO 12 INCHES OF RAIN...WITH LOCALLY HIGHER AMOUNTS POSSIBLE. LOWER BUT STILL SIGNIFICANT TOTALS ARE EXPECTED FOR THE LOWER TERRAIN. PROJECTED RAINFALL ALONG THE COAST IS FORECASTED TO BE AROUND 4 TO 8 INCHES. THE INTERIOR LOWLANDS SHOULD SEE 1 TO 4 INCHES...WITH THE HIGHEST AMOUNTS CLOSER TO THE CASCADE FOOTHILLS. GIVEN THE LATEST FORECASTED RAINFALL TOTALS...IT APPEARS THAT THERE IS THE STRONG POTENTIAL FOR FLOODING OVER THE WEEKEND ON NUMEROUS RIVERS AND TRIBUTARIES DRAINING THE COAST RANGE AND CASCADES. A FEW RIVERS MAY EVEN REACH MAJOR FLOOD STAGE. THE CURRENT RIVER STAGE FORECASTS INDICATE THAT THE FASTER RESPONDING RIVERS COULD REACH FLOOD STAGE AS EARLY AS TONIGHT. THERE ARE ALSO LIKELY TO BE IMPACTS FROM URBAN AND SMALL STREAM FLOODING AND FLOODING ALONG LOW LYING PASTURE LAND. IN ADDITION TO THE FLOODING CONCERNS...EXCESSIVE RAINFALL HAS THE POTENTIAL TO CREATE LANDSLIDES...DEBRIS FLOWS...AND EXCESSIVE RUNOFF IN THE VICINITY OF RECENT WILDFIRE BURN SCARS. BURN SCARS FROM TWO LARGE FIRES THIS SUMMER...THE 36 PIT FIRE IN THE CLACKAMAS RIVER BASIN NEAR ESTACADA AND THE DECEPTION COMPLEX NEAR OAKRIDGE...WILL BE PARTICULARLY VULNERABLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON CURRENT FORECASTS. LANDSLIDES AND DEBRIS FLOWS ARE POSSIBLE DURING THIS FLOOD EVENT. PEOPLE...STRUCTURES AND ROADS LOCATED BELOW STEEP SLOPES...IN CANYONS AND NEAR THE MOUTHS OF CANYONS MAY BE AT SERIOUS RISK FROM RAPIDLY MOVING LANDSLIDES. YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP. THE NEXT UPDATE FOR THIS WATCH WILL BE ISSUED BY 10 PM SATURDAY NIGHT. && $$
Posted on: Sat, 20 Dec 2014 20:14:00 +0000
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