A moist pacific front produced heavy rainfall across Northwest Oregon which resulted in river flooding, urban flooding, small stream flooding, land slides, and a few sink holes.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS PQR wrote it up.
A moist pacific front produced heavy rainfall across Northwest Oregon which resulted in river flooding, urban flooding, small stream flooding, land slides, and a few sink holes.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Portland, OR wrote its last area forecast discussion before the first event at Dec 6, 8:58 PM PST, 3 hours 47 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
858 PM PST SUN DEC 6 2015
.SYNOPSIS...A SERIES OF STRONG AND MOIST PACIFIC FRONTAL SYSTEMS WILL
CONTINUE TO LASH SOUTHWEST WASHINGTON AND NORTHWEST OREGON WITH
PERIODS OF HEAVY RAIN...STRONG WINDS...AND HEAVY SURF FOR MUCH OF THE
UPCOMING WEEK. RAIN AND COASTAL WIND ARE ALREADY DEVELOPING WITH THE
ARRIVAL OF OUR LATEST SYSTEM AS THE FRONT PUSHES SLOWLY SOUTH
THROUGH THE FORECAST AREA. THE FRONTAL ZONE IS THEN EXPECTED TO
STALL AND LIFT BACK NORTHWARD MONDAY NIGHT...BEFORE THE NEXT LOW
PRESSURE SYSTEM FORCES THE FRONT BACK SOUTHWARD FOR MORE HEAVY RAIN
AND STRONG WIND TUESDAY OR TUESDAY NIGHT. ADDITIONAL STORM SYSTEMS
WILL LIKELY BRING MORE WET AND WINDY WEATHER AS THE WEEK PROGRESSES.
HIGH SURF CAN BE EXPECTED AT TIMES ALONG THE COAST...WITH MINOR
COASTAL FLOODING POSSIBLE. IT IS ALSO APPEARING INCREASINGLY LIKELY
THAT THERE WILL BE ENOUGH RAIN TO CAUSE SOME FLOODING...ALTHOUGH THE
DETAILS ON EXACTLY WHERE AND WHEN REMAIN A BIT UNCERTAIN.
&&
.SHORT TERM...CURRENT MODEL TRENDS SUGGEST A WEAKENING OF THE LOW
LEVEL WIND FIELD ACROSS THE N PART OF THE FORECAST AREA AFTER
MIDNIGHT TONIGHT. THIS IS IN REPSONSE TO A SHORTWAVE IN THE WESTERLY
FLOW MOVING THROUGH AND SUPPRESSING THE BAROCLINIC ZONE S. THIS
SHOULD BRING THE HIGH WIND EVENT OVER SW WA TO A QUICKER END THAN
EARLIER EXPECTED. WILL HANG ONTO THE HIGH WIND WARNING ELSEWHERE AS
IT IS UNCLEAR JUST HOW FAR THE FRONT MOVES S DOWN THE OREGON
COAST...BEFORE IT BEGINS TO MOVE N AGAIN DURING THE DAY MON. WITH
THE STRONG SSW LOW LEVEL WIND FIELD SHIFTING S...THE FOCUS FOR HEAVY
RAINS LATER TONIGHT THROUGH MON SHIFTS S TO AND AREA EXTENDING FROM
THE N AND CENTRAL OREGON COAST INLAND TO N OREGON AND S WA CASCADES.
RAINFALL RATES THUS FAR THIS EVENING HAVE BEEN RATHER MODEST...BUT
AS THE LOW LEVEL WIND FIELD STRENGTHENS OVERNIGHT AND PRECIPITABLE
WATER VALUES INCREASE FROM UNDER 1 INCH ALONG THE COAST TO MORE LIKE
1.25 INCHES BY MORNING...SHOULD SEE A SIGNIFICANT JUMP IN RAINFALL
RATES. SNOW LEVELS STILL DOWN AROUND 5K FT IN THE N OREOGN AND S WA
CASCADES...BUT EXPECTED TO BE RISING LATER TONIGHT. WITH
PRECIPITATION RATES INCREASING...WILL ADD AN ADVISORY FOR SNOW TO
THE HIGH N OREGON AND S WA CASCADES FOR THE OVERNIGHT HOURS.
PREVIOUS FULL SHORT TERM DISCUSSION FOLLOWS...TONIGHT THROUGH
MONDAY...THE LATEST IN A SERIES OF FRONTAL SYSTEMS IS ALREADY
BEGINNING TO AFFECT SW WASHINGTON AND NW OREGON WITH LIGHT RAIN AND
SOME GUSTY COASTAL WINDS...WITH KRTX/KLGX RADAR SHOWING WEAK ECHOES
SPREADING ACROSS MUCH OF THE FORECAST AREA.
THOSE NWS DOPPLER RADARS ARE ALSO INDICATING SOME STRONG WINDS JUST
ABOVE THE SURFACE...WITH KLGX INDICATING 60-70 KT WINDS SOME 2000 TO
3000 FT ABOVE THE SURFACE. ESRL PROFILER AT ASTORIA PAINTS A VERY
SIMILAR PICTURE WITH 45-55 KT WINDS AS LOW AS 500M OFF THE
SURFACE...AND CAPE MEARES IS ALREADY GUSTING TO 64 MPH. OVERALL THIS
COASTAL HIGH WIND WARNING LOOKS TO BE IN GOOD SHAPE...A BIT BETTER
THAN THE ONE WHICH STRUGGLED TO VERIFY YESTERDAY.
SYSTEMS ARE MOVING FAST AND FURIOUS ACROSS THE PACIFIC...BEING
CARRIED ALONG BY A GOES-ESTIMATED 185 KT JET WHICH TRAVERSES NEARLY
THE WHOLE BASIN BACK TO THE PHILIPPINES. THESE SYSTEMS HAVE PLENTY OF
BAROCLINICITY AVAILABLE TO THEM...WHICH COMBINED WITH THE POWERFUL
JET IS CREATING A POWDER KEG OF POTENTIAL FOR CYCLOGENESIS THE NEXT
FEW DAYS OFFSHORE. ALL THESE FEATURES WILL ALSO MAKE FORECASTING
ANYTHING BEYOND 24-36 HOURS VERY CHALLENGING WHILE THIS PATTERN IS IN
PLACE...AS SMALL ERRORS IN INITIALIZATION CAN LEAD TO VERY LARGE
ERRORS IN A SHORT PERIOD OF TIME.
THAT SAID...MODELS HAVE HAD A RELATIVELY VERY GOOD HANDLE ON THE
PROGRESSION OF TONIGHT AND MONDAY...EVEN TUESDAY WITH THE PAST FEW
MODEL RUNS. THE MAIN STRUGGLE TODAY HAS BEEN DETERMINING THE LOCATION
OF THE MAIN INTEGRATED VAPOR TRANSPORT AXIS TONIGHT AND
MONDAY...WHICH WILL HAVE HUGE IMPLICATIONS ON WHICH RIVERS WILL FLOOD
BY MONDAY. EARLIER GUIDANCE HAD A FAIRLY HIGH CONFIDENCE FORECAST
THAT THE GRAYS WOULD FLOOD LATE TONIGHT...BUT 18Z MODELS TOOK THE
NORTHERN EXTENT OF THE IVT AXIS A LITTLE FURTHER SOUTH SO WE DECIDED
NOT TO ISSUE A FLOOD WARNING FOR THE GRAYS YET. HOWEVER THIS WOULD
PROBABLY PUT MORE EMPHASIS ON THE NORTH OREGON COASTAL DRAINAGES...
WITH THE POTENTIAL FOR 3-7 INCHES OF RAIN TONIGHT AND MONDAY.
SIMILAR TOTALS ARE LIKELY FOR THE S WA CASCADES AND PROBABLY THE N
OR CASCADES AS WELL.
IF THE FRONT STAYS NEAR OR A BIT SOUTH OF THE WA/OR BORDER AS THE 18Z
GFS/NAM AND EVEN SOMEWHAT THE 12Z ECMWF SUGGEST...IT COULD SET UP A
SITUATION WHERE A VIGOROUS UPPER LEVEL SHORTWAVE AND WEAK SURFACE
REFLECTION RIDE ALONG THE FRONT...DOING TWO IMPORTANT THINGS.
FIRST...IT WOULD ENHANCE THE SOUTH-NORTH PRESSURE GRADIENTS ALONG THE
COAST AND IN THE WILLAMETTE VALLEY SOUTH OF THE FRONT. SECOND...IT
COULD PROVIDE A ZONE OF VERY STRONG FRONTOGENESIS AND VERY HEAVY RAIN
EVEN FOR THE LOWLANDS MONDAY...WITH 1-2 INCHES OF RAIN POSSIBLE IN A
SHORT PERIOD...ALMOST SIMILAR TO WHAT HAPPENED HALLOWEEN AFTERNOON.
FOR NOW WE KEPT THE HEAVIEST RAIN IN THE HIGHER TERRAIN...BUT WILL
NEED TO WATCH THE POTENTIAL FOR A VERY WET AFTERNOON EVEN FOR THE
PORTLAND/VANCOUVER METRO. OUR FORECAST PRESENTLY KEEPS THIS FRONTAL
ZONE A LITTLE FURTHER TO THE NORTH... WHICH WOULD KEEP THE ENTIRE
WILLAMETTE VALLEY OPEN TO STRONG MIXING FOR THE 40-50 KT WINDS JUST
ABOVE THE SURFACE MONDAY. THIS WILL LIKELY BRING 40-50 MPH GUSTS TO
SALEM AND EUGENE...WITH A LITTLE LOWER CONFIDENCE OF THOSE GUSTS
REACHING THE PDX METRO. THERE MAY ALSO BE A CONVECTIVE ELEMENT TO THE
WIND GUSTS MON AFTERNOON AS A STRONG UPPER-LEVEL SHORTWAVE RIDES EAST
ALONG THE FRONT.
THERE ARE NUMEROUS WATCHES WARNINGS AND ADVISORIES POSTED...BUT THE
MOST WIDESPREAD IMPACT WILL LIKELY BE URBAN...SMALL STREAM...AND
RIVER FLOODING THE NEXT FEW DAYS. A CLOSE SECOND WILL BE WINDS...
WHICH WILL BE FAIRLY WIDESPREAD NOT JUST MONDAY BUT POTENTIALLY
TUE/TUE NIGHT. THIS STORMY PATTERN IS ALSO WHIPPING UP ANGRY SEAS
ACROSS MUCH OF THE NE PAC...WHICH WILL LEAD TO 25-35 FT SEAS AND
MINOR COASTAL FLOODING AT TIMES. STAY TUNED AS THIS IS A VERY DYNAMIC
FORECAST AND MANY CHANGES WILL LIKELY BE MADE OVER THE COMING DAYS.
WEAGLE
.MONDAY NIGHT THROUGH WEDNESDAY...MONDAYS STORM SYSTEM WILL SLOWLY
DISSIPATE ACROSS LANE COUNTY AND POINTS SOUTHWARD MONDAY EVENING
BEFORE LIFTING NORTHWARD MONDAY NIGHT AND BRINGING A ROUND OF LIGHT
RAIN TO THE REGION.
THE MAIN SHOW WILL ARRIVE ON TUESDAY AS A STORM SYSTEM CURRENTLY OUT
NEAR THE DATELINE IN THE CENTRAL PACIFIC BRINGS ANOTHER ROUND OF
SIGNIFICANT RAIN...AND SOME BREEZY TO LOCALLY WINDY CONDITIONS TO
NORTHWEST OREGON AND SOUTHWEST WASHINGTON. A FRONT WILL SLOWLY
TRAVERSE SOUTHEASTWARD ACROSS THE AREA BETWEEN TUESDAY AFTERNOON
THROUGH WEDNESDAY MORNING. IVT VALUES IN EXCESS OF 750 KG/MS WILL BE
ORIENTED MORE PERPENDICULAR THAN PARALLEL TO THE COASTLINE...WHICH
SHOULD AID IN PLENTY OF OROGRAPHIC RAIN ENHANCEMENT IN THE COAST
RANGE AND CASCADES. NAEFS RETURN INTERVALS SUGGESTS THESE IVT VALUES
OCCUR ONCE EVERY 5 TO 10 YEARS THIS TIME OF YEAR IN OUR REGION.
GIVEN THESE VALUES WILL PERSIST FOR A 9 TO 15 HOUR PERIOD...
CONFIDENCE IS GROWING THAT THIS WILL BE A SIGNIFICANT RAIN EVENT AND
POSSIBLY A SIGNIFICANT FLOOD EVENT...ESPECIALLY CONSIDERING IT WILL
BE ON THE HEELS OF TONIGHTS/MONDAYS WET WEATHER.
GLOBAL MODELS APPEAR TO BE COMING INTO AGREEMENT THE REGION MAY
TEMPORARILY DRY OUT WEDNESDAY AS SHORTWAVE RIDGING BUILDS OVER THE
PACIFIC NORTHWEST AHEAD OF A DEVELOPING LOW PRESSURE SYSTEM
OFFSHORE. POPS AND QPF WERE TRENDED DOWNWARD...BUT ARE ADMITTEDLY
STILL NEAR TO ABOVE CLIMO FOR THIS PERIOD...WITH ADDITIONAL
DECREASES LIKELY IF MODEL CONSISTENCY CONTINUES. /NEUMAN
.LONG TERM...WEDNESDAY NIGHT THROUGH SUNDAY...MODELS ARE IN GOOD
AGREEMENT THAT AN ACTIVE WEATHER PATTERN WILL CONTINUE INTO NEXT
WEEKEND. AS A RESULT...POPS WERE GENERALLY PLACED NEAR TO ABOVE
CLIMO FOR MOST OF THE EXTENDED PERIOD. THE EC AND GFS HAVE COME INTO
BETTER AGREEMENT EARLY IN THE EXTENDED PERIOD...BOTH DEPICTING A
DEEP LOW PRESSURE...APPROXIMATELY 970MB...MOVING NORTHEASTWARD
TOWARDS THE NORTHERN TIP OF VANCOUVER ISLAND. THE ATTENDANT
OCCLUSION WILL MOVE EASTWARD INTO THE REGION AND BRING ANOTHER ROUND
OF RAIN...AND POSSIBLY SOME WINDY CONDITIONS TO THE REGION WEDNESDAY
NIGHT AND THURSDAY. MODELS HAVE FLUCTUATED SOMEWHAT WILDLY ON HOW
THEY HANDLE THIS SYSTEM OVER THE PAST SEVERAL MODEL RUNS SO
CONFIDENCE IS STILL FAIRLY LOW IN HOW THIS SYSTEM WILL IMPACT THE
REGION.
EITHER WAY...SNOW LEVELS SHOULD DROP FAIRLY QUICKLY INTO THE 3500-
4000 FT RANGE BEHIND THE FRONT ON THURSDAY AND FRIDAY. DEPENDING ON
THE TRACK OF THE LOW PRESSURE...THE CASCADES MAY END UP WITH SOME
DECENT SNOW DURING THIS PERIOD. MODELS SEEM TO BE TRENDING TOWARDS
THE IDEA THAT THE AREA MAY TEMPORARILY DRY OUT LATE FRIDAY BEFORE
ANOTHER STORM SYSTEM HITS THE PACIFIC NORTHWEST SATURDAY-ISH.
/NEUMAN
&&
.AVIATION...WARM FRONTAL RAIN SPREADING INTO THE REGION WILL BRING
A MIX OF IFR AND MVFR CONDITIONS FOR COASTAL TAF SITES AND PREDOMINANTLY
MVFR CONDITIONS FOR INTERIOR TAF SITES THROUGH AT LEAST 18Z
MONDAY. THERE MAY BE A SLIGHT TENDENCY FOR INTERIOR TAF
SITES...PARTICULARLY PDX METRO TAFS TO HEDGE TOWARDS HIGH END IFR
CONDITIONS AROUND 09Z MONDAY AND THEN AGAIN AROUND 18Z
MONDAY...BUT CONFIDENCE IS LOW IN THIS SCENARIO. IN
ADDITION...STRONG SOUTH WINDS ALONG THE COAST WILL CONTINUE FOR
THE NEXT SEVERAL HOURS...PERHAPS PEAKING AROUND 50 KT AT
KONP...BEFORE DECREASING BETWEEN 09Z AND 15Z MONDAY. SOUTH WINDS
WILL LIKELY INCREASE AND SPREAD NORTHWARD UP THE COAST AROUND 18Z
MONDAY. IN ADDITION...SOUTH WINDS SHOULD ALSO INCREASE AT INTERIOR
TAF SITES AROUND 18Z MONDAY...WITH SOUTH WIND GUSTS OF 25 TO 40 KT
POSSIBLE AFTER 18Z MONDAY.
KPDX AND APPROACHES...EXPECT MAINLY MVFR CONDITIONS THROUGH AT
LEAST 18Z MONDAY AS A STEADY RAIN FALLS OVER THE TERMINAL. THERE
MAY BE A TENDENCY FOR CONDITIONS TO TRY AND DIP INTO HIGH END IFR
CONDITIONS AROUND 09Z AND THEN AGAIN 18Z MONDAY...BUT CONFIDENCE
IS LOW. SOUTHERLY WIND GUSTS OF 25 TO 40 KT APPEAR PROBABLE AFTER
18Z MONDAY. /NEUMAN
&&
.MARINE...AN EXTENDED PERIOD OF EXTREMELY HAZARDOUS SEAS WILL
CONTINUE FOR THE WATERS OFF THE NORTH OREGON AND SOUTH WASHINGTON
COASTS FOR MUCH OF THE NEXT WEEK.
A FRONTAL STORM SYSTEM IS CURRENTLY WORKING ITS WAY EASTWARD
TOWARDS THE OREGON COAST THIS EVENING. WINDS AHEAD OF THIS SYSTEM
ARE CURRENTLY SOLID GALE FORCE WITH OCCASIONAL STORM FORCE GUSTS
APPROACHING 50 KT. SEAS HAVE RESPONDED ACCORDINGLY AND CLIMBED
TO 20 TO 30 FT DEPENDING UPON LOCATION. SEAS SHOULD STILL COME UP
SEVERAL MORE FEET...PARTICULARLY AT BUOY 29 AND BUOY 50 GIVEN
STRONG WINDS WILL CONTINUE FOR SEVERAL MORE HOURS. AS THIS FRONT
APPROACHES THE COAST...IT WILL WEAKEN AND PUSH ASHORE ACROSS THE
SOUTH WASHINGTON AND FAR NORTH OREGON COASTS. THIS SHOULD ALLOW
WINDS TO DECREASE BELOW STORM FORCE CRITERIA. LATEST MODEL
GUIDANCE STRONG SOUTH WIND GUSTS OF 40 TO 50 KT WILL LIKELY HOLD
ON ACROSS THE CENTRAL OREGON WATERS INTO MONDAY MORNING BEFORE
THEY SPREAD BACK NORTHWARD INTO THE NORTHERN WATERS. WILL KEEP
STORM WARNING AS IS...BUT SUSPECT A GALE WARNING MAY BE MORE
APPROPRIATE FOR THE NORTHERN WATERS MONDAY AFTERNOON.
EXPECT SEAS TO PEAK BETWEEN 25 AND 35 FT TONIGHT BEFORE GRADUALLY
DECREASING INTO THE UPPER TEENS TOWARDS MIDDAY MONDAY. DEPENDING
ON HOW STRONG WINDS BECOME MONDAY AFTERNOON...SEAS COULD
TEMPORARILY FLIRT WITH 20 FT AGAIN...BUT SEAS OVERALL SHOULD BE ON
THE DOWNWARD TREND MONDAY NIGHT AND EARLY TUESDAY...LIKELY DIPPING
INTO THE 14 TO 17 FT RANGE.
THE NEXT FRONTAL STORM SYSTEM LOOKS TO ARRIVE TUESDAY...BRING AT
LEAST SOLID GALE FORCE WIND GUSTS OF 40 TO 45 KT...PERHAPS PEAKING
AGAIN AROUND 50 KT. THIS SHOULD ONCE AGAIN PUSH SEAS UP TOWARDS OR
A BIT ABOVE 20 FT. MODELS HINT THAT A BREAK IN THE WEATHER MAY
OCCUR WEDNESDAY...WHICH MAY ALLOW SEAS TO FALL BACK DOWN INTO THE
MID TO UPPER TEENS. HOWEVER...A STRONG SURFACE LOW PRESSURE WILL
LIKELY DEVELOP OFF THE PACIFIC NORTHWEST COAST LATE WEDNESDAY
NIGHT AND THURSDAY. DETAILS REMAIN UNCERTAIN REGARDING THIS STORM
SYSTEM...BUT CERTAINLY ANOTHER ROUND OF GALE TO STORM FORCE WINDS
APPEAR POSSIBLE WITH PERHAPS A WESTERLY SWELL IN THE 25 TO 30 FT
RANGE WITH A DOMINANT PERIOD AROUND 15 TO 17 SECONDS PUSHING INTO
THE WATERS ON THURSDAY. WILL NEED TO MONITOR THIS STORM SYSTEM AND
ESPECIALLY ON WHETHER OR NOT THIS LARGE SWELL DEVELOPS AS IT
APPEARS IT MAY NECESSITATE A HIGH SURF WARNING AND A COASTAL FLOOD
WATCH.
IN ADDITION...HIGH TIDES...TIDAL ANOMALIES AND INCREASING RIVER
FLOWS...WILL LIKELY RESULT IN TIDAL OVERFLOW FLOODING UP AND DOWN
THE OREGON AND SOUTH WASHINGTON COASTS MONDAY...TUESDAY AND
WEDNESDAY MORNINGS. GIVEN RIVER LEVELS WILL LIKELY BE HIGHEST
TUESDAY AND WEDNESDAY...THESE DAYS ARE OF GREATEST CONCERN. LATE
MORNING HOURS EACH DAY ARE EXPECTED TO BE THE MOST PROBLEMATIC.
/NEUMAN
&&
.PQR WATCHES/WARNINGS/ADVISORIES...
OR...FLOOD WATCH THROUGH WEDNESDAY AFTERNOON FOR CENTRAL COAST RANGE
OF WESTERN OREGON-CENTRAL COLUMBIA RIVER GORGE-CENTRAL
OREGON COAST-CENTRAL WILLAMETTE VALLEY-COAST RANGE OF
NORTHWEST OREGON-GREATER PORTLAND METRO AREA-LOWER COLUMBIA-
NORTH OREGON COAST-NORTHERN OREGON CASCADE FOOTHILLS-
NORTHERN OREGON CASCADES-SOUTH WILLAMETTE VALLEY-UPPER HOOD
RIVER VALLEY-WESTERN COLUMBIA RIVER GORGE.
WINTER WEATHER ADVISORY UNTIL 6 AM PST MONDAY FOR NORTHERN
OREGON CASCADES.
WIND ADVISORY FROM 6 AM TO 6 PM PST MONDAY FOR CENTRAL
WILLAMETTE VALLEY-GREATER PORTLAND METRO AREA-SOUTH
WILLAMETTE VALLEY.
HIGH WIND WARNING UNTIL 3 PM PST MONDAY FOR CENTRAL COAST RANGE
OF WESTERN OREGON-CENTRAL OREGON COAST-COAST RANGE OF
NORTHWEST OREGON-NORTH OREGON COAST.
HIGH SURF ADVISORY UNTIL 9 AM PST MONDAY FOR CENTRAL OREGON
COAST-NORTH OREGON COAST.
COASTAL FLOOD ADVISORY FROM 8 AM TO 1 PM PST MONDAY FOR CENTRAL
OREGON COAST-NORTH OREGON COAST.
COASTAL FLOOD ADVISORY FROM 8 AM TO 1 PM PST TUESDAY FOR CENTRAL
OREGON COAST-NORTH OREGON COAST.
COASTAL FLOOD ADVISORY FROM 8 AM TO 1 PM PST WEDNESDAY FOR
CENTRAL OREGON COAST-NORTH OREGON COAST.
WA...FLOOD WATCH THROUGH WEDNESDAY AFTERNOON FOR CENTRAL COLUMBIA
RIVER GORGE-GREATER VANCOUVER AREA-I-5 CORRIDOR IN COWLITZ
COUNTY-SOUTH WASHINGTON CASCADE FOOTHILLS-SOUTH WASHINGTON
CASCADES-SOUTH WASHINGTON COAST-WESTERN COLUMBIA RIVER
GORGE-WILLAPA HILLS.
WIND ADVISORY FROM 6 AM TO 6 PM PST MONDAY FOR GREATER VANCOUVER
AREA.
HIGH SURF ADVISORY UNTIL 9 AM PST MONDAY FOR SOUTH WASHINGTON
COAST.
COASTAL FLOOD ADVISORY FROM 8 AM TO 1 PM PST MONDAY FOR SOUTH
WASHINGTON COAST.
COASTAL FLOOD ADVISORY FROM 8 AM TO 1 PM PST TUESDAY FOR SOUTH
WASHINGTON COAST.
COASTAL FLOOD ADVISORY FROM 8 AM TO 1 PM PST WEDNESDAY FOR SOUTH
WASHINGTON COAST.
HIGH WIND WARNING UNTIL 3 AM PST MONDAY FOR SOUTH WASHINGTON
COAST-WILLAPA HILLS.
PZ...STORM WARNING UNTIL 1 PM PST MONDAY FOR COASTAL WATERS FROM CAPE
SHOALWATER WA TO FLORENCE OR OUT 60 NM.
SMALL CRAFT ADVISORY FOR ROUGH COLUMBIA RIVER BAR UNTIL 4 PM PST
MONDAY.
&&
INTERACT WITH US VIA SOCIAL MEDIA
WWW.FACEBOOK.COM/NWSPORTLAND
WWW.TWITTER.COM/NWSPORTLAND
THIS DISCUSSION IS FOR NORTHWEST OREGON AND SOUTHWEST WASHINGTON
FROM THE CASCADE CREST TO 60 NAUTICAL MILES OFFSHORE. THE AREA IS
COMMONLY REFERRED TO AS THE FORECAST AREA.The national radar mosaic for the moment the first event began.
9 flood, 4 heavy rain. Local standard time, as filed.
Heavy rain resulted in flooding of small streams in the Sweet Home area. Water flooded the basements and lower floors of some homes, and a rock slide closed one lane of Highway 20.
Heavy rain resulted in urban flooding and several landslides throughout Tillamook County.
The Wilson River near Tillamook, The Trask River near Tillamook, and The Nehalem River near Foss exceeded flood stage. high water from these rivers resulted in the closure of several roads including Highway 101.
Heavy rain resulted in urban flooding and small stream flooding throughout the Portland Metro area. The rain was heavy enough to collapse a roof of a business in Gresham Oregon, cause a sink hole near Mt Hood College. High water flowing into Fairview Creek in Gresham snapped a sewage line. Several roads were closed due to high water and the Trimet Max operations were interrupted. water crept into businesses and homes. There were at least two land slides in Portland; one on Corbett Hill, and the other on Cornell Road.
Heavy rain resulted in flooding of the Siltez river near Siletz and the Alsea River near Tidewater. High water covered many roads.
Heavy rain resulted in flooding of the Tualatin River near Dilly, and of many small creeks between Beaverton and Gaston. Around 50 homes sustained flood damage and many roads were closed including Highway 217 in Beaverton (during the evening commute).
Flooding of Johnson Creek and of the Clackamas River resulted in significant damage to businesses, homes, and vehicles in Milwuakie, Clackamas, Boring, Lake Oswego, and Happy Valley. Around 50 homes were evacuated and eight people were rescued. High water and debris flow closed several roads in the area.
Heavy rain resulted in urban flooding in McMinnville with standing water reported in town. High water closed several roads in the area including Highway 99.
Heavy rain resulted in Johnson Creek to exceed major flood stage. Water from the river flooded homes, vehicles, and businesses. Several roads were closed due to the high water.
Heavy rain resulted in the Siuslaw River to exceed flood stage at Mapleton. Several small streams also flooded in the area.
Heavy rain resulted in flooding of the Nehalem River near Vernonia, and several small streams in the area. The Timber Road Bridge over Gales Creek washed out north of Highway 6.
Heavy rain resulted in the flooding of Hood River near Hood River.
Heavy rain resulted in flooding of the Lukiamute River near Suver as well as several streams in the area. Water covered many of the roads including the closure of Highway 18.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2015Every state in 2015This day in weather historyWarnings in Oregon, December 2015
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 611954, 611945, 611946, 611948, 611956, 611960, 611955, 611961, 611947, 611952, 611963, 611966, 611958.