weather.gov     
National Weather Service

Watches, Warnings & Advisories
NWS Homepage

Flood Watch


FLOOD WATCH
NATIONAL WEATHER SERVICE SEATTLE WA
1208 AM PST SAT DEC 20 2014

WAC009-027-031-033-041-045-053-057-061-067-073-210000-
/O.CON.KSEW.FA.A.0015.141221T0000Z-141222T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLALLAM-GRAYS HARBOR-JEFFERSON-KING-LEWIS-MASON-PIERCE-SKAGIT-
SNOHOMISH-THURSTON-WHATCOM-
1208 AM PST SAT DEC 20 2014

...FLOOD WATCH REMAINS IN EFFECT FROM THIS AFTERNOON THROUGH LATE
SUNDAY NIGHT...

THE FLOOD WATCH CONTINUES FOR

* PORTIONS OF WESTERN WASHINGTON...INCLUDING THE FOLLOWING
  COUNTIES... GRAYS HARBOR...CLALLAM...JEFFERSON...SKAGIT...
  WHATCOM...KING...LEWIS...MASON...PIERCE...SNOHOMISH...THURSTON.

* FROM THIS AFTERNOON THROUGH LATE SUNDAY NIGHT

* HEAVY RAIN IS FORECAST OVER WESTERN WASHINGTON TODAY AND
  SUNDAY...ESPECIALLY IN THE MOUNTAINS. STRONG SOUTH FLOW ALOFT
  WILL BRING HEAVY RAIN AT TIMES TO THE COAST AND OLYMPICS TODAY.
  HEAVY RAIN WILL SPREAD OVER THE CASCADES LATE THIS AFTERNOON AS
  STRONG WESTERLY FLOW ALOFT DEVELOPS. MODELS CURRENTLY TAPER RAIN
  OVER THE OLYMPICS ON SUNDAY BUT KEEP HEAVY RAIN GOING IN THE
  CASCADES INTO SUNDAY EVENING...ESPECIALLY OVER THE CASCADES FROM
  ABOUT KING COUNTY SOUTH. THE TOTAL MODEL RAINFALL OVER ABOUT 48
  HOURS FROM THIS MORNING THROUGH SUNDAY NIGHT AMOUNTS TO AROUND
  THREE TO SIX INCHES OVER THE OLYMPICS AND CENTRAL CASCADES WITH
  A NINE-INCH BULLS-EYE OVER MOUNT RAINIER. RAINFALL OVER THE
  LOWLANDS WILL GENERALLY BE AN INCH OR LESS AS THE WESTERLY FLOW
  CAUSES A RAIN SHADOW EAST OF THE OLYMPICS.

* 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 SATURDAY NIGHT ON THE OLYMPICS AND
  SUNDAY FOR THE CASCADES...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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLOOD WATCH MEANS CONDITIONS ARE FAVORABLE FOR FLOODING BUT
FLOODING IS NOT IMMINENT OR OCCURRING. MONITOR THE LATEST
FORECASTS FROM THE NATIONAL WEATHER SERVICE AND BE READY TO ACT
QUICKLY IF FLOODING IS OBSERVED OR A WARNING IS ISSUED.

&&

$$

FLOOD WATCH
NATIONAL WEATHER SERVICE PENDLETON OR
1208 PM PST SAT DEC 20 2014

...THE FLOOD WATCH CONTINUES FOR THE FOLLOWING RIVERS IN OREGON...
WASHINGTON...
  DESCHUTES RIVER AT MOODY AFFECTING SHERMAN AND WASCO COUNTIES
  NACHES RIVER NEAR NACHES AFFECTING YAKIMA COUNTY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLOOD WATCH MEANS THERE IS POTENTIAL FOR FLOODING BASED ON CURRENT
FORECASTS. YOU SHOULD MONITOR LATER FORECAST AND BE ALERT FOR
POSSIBLE FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING
SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP.

ADDITIONAL INFORMATION IS AVAILABLE AT:
HTTP://WATER.WEATHER.GOV/AHPS2/INDEX.PHP?WFO=PDT

&&

WAZ027-520-212008-
/O.CON.KPDT.FL.A.0004.000000T0000Z-141223T0843Z/
/NACW1.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
1208 PM PST SAT DEC 20 2014

THE FLOOD WATCH CONTINUES FOR
  THE NACHES RIVER NEAR NACHES
* UNTIL LATE MONDAY NIGHT.
* AT 10:15 AM SATURDAY THE STAGE WAS 14.0 FEET.
* MINOR FLOODING IS POSSIBLE.
* FLOOD STAGE IS 17.8 FEET.
* FORECAST...FLOOD STAGE MAY BE REACHED BY EARLY MONDAY MORNING.
* THE RIVER IS FORECAST TO REACH A STAGE OF 17.6 FEET BY
  MONDAY MORNING. THIS IS BASED ON FORECAST PRECIPITATION AMOUNTS
AND MAY BE REVISED UPWARD.


$$

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.

&&

$$

FLOOD WATCH
NATIONAL WEATHER SERVICE PENDLETON OR
245 AM PST SAT DEC 20 2014

...WIDESPREAD MODERATE TO HEAVY RAIN IS EXPECTED OVER THE NEXT 48
TO 72 HOURS ACROSS THE MOUNTAINS OF NORTHEAST OREGON AND SOUTHEAST
WASHINGTON...

.A LARGE MOIST PACIFIC STORM SYSTEM WILL MOVE INTO THE AREA
TODAY THROUGH MONDAY AFTERNOON. WITH 72 HOUR RAINFALL AMOUNTS
IN EXCESS OF 2 TO 4 INCHES ALONG THE MOUNTAINS OF NORTHEAST
OREGON...AND 3 TO 7 INCHES ACROSS THE EAST SLOPES OF THE
CASCADES...FLOODING OF RIVERS AS WELL AS SMALL CREEKS AND STREAMS
WILL BE POSSIBLE.

ORZ041-509>511-WAZ024-026-027-520-521-202300-
/O.CON.KPDT.FA.A.0003.141221T0000Z-141223T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
EAST COLUMBIA RIVER GORGE OF OREGON-
EAST SLOPES OF THE OREGON CASCADES-NORTH CENTRAL OREGON-
CENTRAL OREGON-EASTERN COLUMBIA RIVER GORGE OF WASHINGTON-
KITTITAS VALLEY-YAKIMA VALLEY-
EAST SLOPES OF THE WASHINGTON CASCADES-SIMCOE HIGHLANDS-
INCLUDING THE CITIES OF...ARLINGTON...THE DALLES...LA PINE...
SUNRIVER...DUFUR...MAUPIN...BEND...MADRAS...PRINEVILLE...
REDMOND...WHITE SALMON...ELLENSBURG...THORP...NACHES...
SUNNYSIDE...TOPPENISH...YAKIMA...APPLETON...CLE ELUM...
CLIFFDELL...GOLDENDALE
245 AM PST SAT DEC 20 2014

...FLOOD WATCH REMAINS IN EFFECT FROM THIS AFTERNOON THROUGH
MONDAY AFTERNOON...

THE FLOOD WATCH CONTINUES FOR

* PORTIONS OF OREGON AND WASHINGTON...INCLUDING THE FOLLOWING
  AREAS...IN OREGON...CENTRAL OREGON...EAST COLUMBIA RIVER GORGE
  OF OREGON...EAST SLOPES OF THE OREGON CASCADES AND NORTH CENTRAL
  OREGON. IN WASHINGTON...EAST SLOPES OF THE WASHINGTON CASCADES
  AND SIMCOE HIGHLANDS...EASTERN COLUMBIA RIVER GORGE OF
  WASHINGTON...KITTITAS VALLEY AND THE YAKIMA VALLEY.

* FROM THIS AFTERNOON THROUGH MONDAY AFTERNOON

* MODERATE TO HEAVY RAINFALL ALONG THE EAST SLOPES OF THE CASCADES
  WILL LEAD TO RISING RIVERS AS WELL AS THE SMALL CREEKS AND
  STREAMS. SNOW LEVELS WILL START OFF AROUND 2500-3000 FEET...BUT
  WILL QUICKLY RISE TO OVER 6000 FEET BY SUNDAY AFTERNOON.

* SMALL CREEKS AND STREAMS WILL START TO RISE TODAY WITH THE
  LARGER RIVERS SEEING SUBSTANTIAL RISES TONIGHT AND SUNDAY. MINOR
  FLOODING WILL BE POSSIBLE SUNDAY EVENING INTO MONDAY EVENING FOR
  THE DESCHUTES RIVER NEAR MOODY...AND THE NACHES RIVER NEAR
  NACHES. SEVERAL OTHER RIVERS ARE EXPECTED TO CREST AT ACTION
  STAGE...BUT ARE NOT FORECAST TO REACH FLOOD STAGE. HOWEVER...THE
  SMALL CREEKS AND STREAMS COULD SEE MINOR FLOODING...ESPECIALLY
  SUNDAY AS MODERATE RAIN AND SNOW MELT ARE EXPECTED TO OCCUR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON
CURRENT FORECASTS.

YOU SHOULD MONITOR THE LATEST FORECASTS AND BE ALERT FOR POSSIBLE
FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE
PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP.

&&

$$

U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: June 2, 2009
NATIONAL WEATHER SERVICE: for Safety, for Work, for Fun - FOR LIFE