Big and unusual NW storm thus weekend as the remnants of a typhoon slam into the a oregon coast.
5 days perception over 11 inches from the models
http://www.hpc.ncep.noaa.gov/qpf/p120i12.gif SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PORTLAND OR
257 PM PDT FRI SEP 27 2013
UPDATED TO ADD INFORMATION ABOUT POSSIBLE DEBRIS FLOWS AND LANDSLIDES
ORZ001>014-WAZ019>023-039-040-281400-
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-WESTERN COLUMBIA RIVER GORGE-
NORTHERN OREGON CASCADE FOOTHILLS-NORTHERN OREGON CASCADES-
CASCADE FOOTHILLS IN LANE COUNTY-CASCADES IN LANE COUNTY-
UPPER HOOD RIVER VALLEY-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...
LINCOLN CITY...NEWPORT...FLORENCE...VERNONIA...JEWELL...TRASK...
GRANDE RONDE...TIDEWATER...SWISSHOME...ST. HELENS...CLATSKANIE...
HILLSBORO...PORTLAND...OREGON CITY...GRESHAM...SALEM...
MCMINNVILLE...DALLAS...EUGENE...CORVALLIS...ALBANY...HOOD RIVER...
CASCADE LOCKS...MULTNOMAH FALLS...SANDY...
SILVER FALLS STATE PARK...SWEET HOME...GOVERNMENT CAMP...
DETROIT...SANTIAM PASS...VIDA...LOWELL...COTTAGE GROVE...
MCKENZIE BRIDGE...OAKRIDGE...WILLAMETTE PASS...PARKDALE...ODELL...
COLDWATER RIDGE VISITORS CENTER...MOUNT ST. HELENS...FRANCES...
RYDERWOOD...RAYMOND...LONG BEACH...CATHLAMET...LONGVIEW...KELSO...
CASTLE ROCK...STEVENSON...SKAMANIA...VANCOUVER...BATTLE GROUND...
WASHOUGAL...TOUTLE...ARIEL...COUGAR
257 PM PDT FRI SEP 27 2013
...UNUSUAL SEPTEMBER WINDY AND VERY WET STORM SYSTEMS EXPECTED
THIS WEEKEND TO IMPACT SOUTHWEST WASHINGTON AND NORTHWEST
OREGON...
A SERIES OF POTENT EARLY FALL STORMS WILL IMPACT THE PACIFIC
NORTHWEST THROUGH THIS WEEKEND...BRINGING A PROLONGED PERIOD OF
MODERATE TO VERY HEAVY RAINS TO THE SOUTHWEST WASHINGTON AND
NORTHWEST OREGON. TWO OF THESE STORMS WILL ALSO PRODUCE STRONG
WINDS ALONG THE COAST AND LOCALLY INLAND AS WELL. THESE ARE HIGHLY
UNUSUAL STORMS FOR SEPTEMBER AND HAVE THE POTENTIAL FOR PRODUCING
RECORD RAINS.
THE FIRST BATCH OF RAIN HAS SPREAD ONSHORE INTO SOUTHWEST
WASHINGTON AND NORTHWEST OREGON THIS AFTERNOON...AND WILL CONTINUE
INTO TONIGHT. BETWEEN 0.75 AND 2.00 INCHES OF RAIN WILL FALL BY
DAYBREAK SATURDAY WITH HEAVIEST AMOUNTS OVER THE COAST RANGE AND
SOUTHWEST SLOPES OF THE WASHINGTON CASCADES. THIS STORM WILL ALSO
BRING BREEZY CONDITIONS TO THE AREA...BUT WILL BE THE WEAKEST
STORM OF THIS SERIES.
THE NEXT STORM ON SATURDAY WILL BE CONSIDERABLY STRONGER AND
WETTER...AND WILL CONTAIN TROPICAL MOISTURE FROM A FORMER WESTERN
PACIFIC TYPHOON. RAIN WILL INCREASE DRAMATICALLY DURING THE DAY
SATURDAY AND CONTINUE HEAVY AT TIMES THROUGH A GOOD PART OF
SATURDAY NIGHT. HIGH WINDS WILL ALSO OCCUR ALONG THE COASTAL STRIP
AND BEACHES...WITH BREEZY TO WINDY CONDITIONS INLAND INTO THE
VALLEYS.
THE SECOND POTENTIALLY EVEN STRONGER STORM IS EXPECTED TO APPROACH
SUNDAY AND MOVE THROUGH THE AREA SUNDAY NIGHT. THIS STORM WILL
ALSO HAVE TROPICAL MOISTURE WITH IT AND MAY HAVE SOME OF THE
REMNANT CIRCULATION OF THE FORMER TYPHOON IN IT. THIS STORM WILL
BRING ANOTHER ROUND OF HEAVY RAIN TO SOUTHWEST WASHINGTON AND
NORTHWEST OREGON SUNDAY AND SUNDAY NIGHT. EVEN STRONGER WINDS ARE
POSSIBLE WITH THIS STORM...BOTH AT THE COAST AND INLAND.
RAINFALL ESTIMATES THROUGH MONDAY SHOW AMOUNTS IN THE COAST RANGE
AND CASCADES COULD REACH 7 TO 10 INCHES...WITH 2 TO 4 INCHES IN
THE VALLEYS. THESE RAINS WILL LIKELY LEAD TO AREAS OF URBAN AND
SMALL STREAM FLOODING. LARGER RIVERS WILL LIKELY ALSO SEE
SIGNIFICANT RISES. THIS AMOUNT OF RAINFALL WILL ALSO LEAD TO DEBRIS
FLOWS AND LANDSLIDES IN STEEPER TERRAIN. SOME PLACES THIS OFTEN
OCCURS INCLUDES THE COLUMBIA RIVER GORGE...THE WEST HILLS OF
PORTLAND...AND THE FOOTHILLS OF THE CASCADES.
THE COMBINATION OF HEAVY RAIN...SATURATED SOILS...STRONG
WINDS...AND TREES WITH A FULL COMPLEMENT OF LEAVES WILL LIKELY
LEAD TO TREE DAMAGE AND POWER DISRUPTIONS...ESPECIALLY AT THE
COAST AND IN THE COAST RANGE BUT ALSO POSSIBLY IN THE INLAND
VALLEYS BOTH SATURDAY AND SUNDAY.
THE STRONG WINDS AND EXPECTED HIGH SEAS WILL CAUSE PROBLEMS FOR
MARINERS ALONG THE COAST. PEOPLE SHOULD ALSO AVOID BEACH AREAS
WHERE THEY CAN BE WASHED AWAY BY THE HIGHER WAVES AND CAN BE
SEVERELY INJURED OR KILLED BY DEBRIS TOSSED ONSHORE.
DETAILS ON THIS DEVELOPING STORM CONTINUE TO COME TOGETHER. PLEASE
CONTINUE TO MONITOR THE LATEST INFORMATION FROM THE NATIONAL
WEATHER SERVICE FOR THE LATEST WATCHES...WARNINGS...OR ADVISORIES
THAT ARE IN EFFECT.
$$
FOR ADDITIONAL WEATHER INFORMATION...VISIT OUR WEB SITE AT
WWW.WEATHER.GOV/PORTLAND