Weather Service Report


059 
WWUS46 KPQR 170436
WSWPQR

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE PORTLAND OR
836 PM PST MON JAN 16 2017

...MAJOR ICE STORM LIKELY TUESDAY AND WEDNESDAY FOR THE HOOD
RIVER AND WIND RIVER VALLEYS...THE COLUMBIA RIVER GORGE...AS WELL
AS MANY VALLEYS WITHIN THE GIFFORD PINCHOT NATIONAL FOREST...

...FREEZING RAIN EXPECTED TUESDAY FOR THE GREATER PORTLAND AND
VANCOUVER METRO AREA...NEARBY VALLEYS IN THE COAST RANGE AND
CASCADES...AND THE CENTRAL AND SOUTH WILLAMETTE VALLEY...

.TEMPERATURES ARE EXPECTED TO REMAIN AT OR BELOW FREEZING UNDER
VALLEY INVERSIONS TONIGHT AND TUESDAY MORNING. MEANWHILE...A VERY
MOIST PACIFIC FRONTAL SYSTEM WILL SPREAD RAIN ACROSS THE REGION
TUESDAY MORNING...INCREASING TUESDAY AFTERNOON AND EVENING. THERE
WILL LIKELY BE SEVERAL HOURS OF RAIN BEFORE WARM AIR ALOFT CAN
WORK ITS WAY DOWN TO THE VALLEY FLOORS...LEADING TO THE POTENTIAL
OF SEVERAL HOURS OF FREEZING RAIN. AREAS IN AND NEAR THE COLUMBIA
GORGE WILL BE HARDEST HIT...AS THEY WILL BE THE LAST TO CLIMB
ABOVE FREEZING.

ORZ006-WAZ039-171500-
/O.UPG.KPQR.ZR.Y.0003.170117T1200Z-170118T0200Z/
/O.EXB.KPQR.IS.W.0002.170117T1200Z-170118T0600Z/
GREATER PORTLAND METRO AREA-GREATER VANCOUVER AREA-
INCLUDING THE CITIES OF...HILLSBORO...PORTLAND...OREGON CITY...
GRESHAM...VANCOUVER...BATTLE GROUND...WASHOUGAL
836 PM PST MON JAN 16 2017

...ICE STORM WARNING IN EFFECT FROM 4 AM TO 10 PM PST TUESDAY FOR
THE GREATER PORTLAND AND VANCOUVER METRO AREAS...

THE NATIONAL WEATHER SERVICE IN PORTLAND HAS UPGRADED THE FREEZING
RAIN ADVISORY TO AN ICE STORM WARNING...WHICH IS IN EFFECT FROM 4
AM TO 10 PM PST TUESDAY.

* TIMING...LIGHT FREEZING RAIN IS EXPECTED TO DEVELOP EARLY
  TUESDAY MORNING...LIKELY AFFECTING THE MORNING COMMUTE. AFTER A
  LULL DURING THE LATE MORNING AND EARLY AFTERNOON...EXPECT
  HEAVIER PRECIPITATION TO MOVE IN DURING THE LATE AFTERNOON AND
  EVENING. THIS HEAVIER PRECIPITATION WILL LIKELY FALL AS FREEZING
  RAIN IN EASTERN PORTIONS OF THE METRO AREA.

* TEMPERATURES....AT OR BELOW FREEZING THROUGH TUESDAY
  MORNING...THEN SLOWLY CLIMBING ABOVE FREEZING TUESDAY AFTERNOON
  WITH MOST AREAS TRANSITIONING TO RAIN. HOWEVER...AREAS EAST OF
  INTERSTATE 205 MAY REMAIN BELOW FREEZING THROUGH MUCH OF TUESDAY
  NIGHT...ALLOWING FREEZING RAIN TO CONTINUE FOR MUCH LONGER THAN
  OTHER PORTIONS OF THE METRO AREA.

* ICE ACCUMULATION...GENERALLY 0.10 TO 0.25 INCH. HOWEVER AREAS
  EAST OF I-205 MAY SEE 0.25 TO 0.5 INCH...WITH LOCALIZED AMOUNTS
  OF 0.5 TO 1 INCH IN AREAS CLOSER TO THE GORGE.

* IMPACTS...MANY ROADS REMAIN SNOW AND ICE COVERED FROM LAST WEEKS
  SNOWSTORM. IT MAY TAKE A COUPLE HOURS OF TEMPERATURES ABOVE
  FREEZING TO COMPLETELY END THE FREEZING RAIN THREAT AT ANY GIVEN
  LOCATION. ROADS MAY AGAIN BECOME DIFFICULT FOR TRAVEL ACROSS THE
  GREATER PORTLAND AND VANCOUVER METRO AREA TUESDAY MORNING. ICE
  ACCUMULATION ON TREES AND POWER LINES MAY RESULT IN DOWNED
  BRANCHES AND LINES...WHICH WOULD BRING THE THREAT OF POWER
  OUTAGES TUESDAY INTO TUESDAY NIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AN ICE STORM WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE
EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF ICE ACCUMULATIONS
WILL MAKE TRAVEL DANGEROUS OR IMPOSSIBLE. TRAVEL IS STRONGLY
DISCOURAGED. COMMERCE WILL LIKELY BE SEVERELY IMPACTED. IF YOU
MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT...FOOD...AND WATER IN YOUR
VEHICLE IN CASE OF AN EMERGENCY. ICE ACCUMULATIONS AND WINDS WILL
LIKELY LEAD TO SNAPPED POWER LINES AND FALLING TREE BRANCHES THAT
ADD TO THE DANGER.

&&

$$

ORZ014>016-WAZ045-046-171500-
/O.CON.KPQR.IS.W.0002.170117T1400Z-170119T0200Z/
UPPER HOOD RIVER VALLEY-WESTERN COLUMBIA RIVER GORGE-
CENTRAL COLUMBIA RIVER GORGE-
INCLUDING THE CITIES OF...ODELL...CORBETT...HOOD RIVER...CARSON...
UNDERWOOD
836 PM PST MON JAN 16 2017

...ICE STORM WARNING REMAINS IN EFFECT FROM 6 AM TUESDAY TO 6 PM
PST WEDNESDAY BELOW 2500 FEET FOR THE UPPER HOOD RIVER VALLEY AND
WESTERN AND CENTRAL COLUMBIA RIVER GORGE...

* TIMING...LIGHT FREEZING RAIN IS EXPECTED TO DEVELOP TUESDAY 
  MORNING WILL THEN INCREASE IN THE AFTERNOON. FREEZING RAIN 
  WILL BECOME HEAVY AT TIMES TUESDAY NIGHT AND WEDNESDAY. 
  TEMPERATURES WILL BE VERY SLOW TO CLIMB...AND MANY LOCATIONS 
  MAY NOT CLIMB ABOVE FREEZING UNTIL WEDNESDAY AFTERNOON OR 
  EVENING. PRECIPITATION WILL TAPER TO SHOWERS WEDNESDAY NIGHT. 

* ICE ACCUMULATION...ICE ACCUMULATIONS OF ONE HALF INCH TO ONE 
  INCH EXPECTED TO BE FAIRLY WIDESPREAD. SOME LOCATIONS MAY 
  EXCEED ONE AND A HALF OF INCHES OF ICE FROM THIS STORM. 

* IMPACTS...THIS IS EXPECTED TO BE YET ANOTHER MAJOR ICE STORM
  FOR THE WESTERN AND CENTRAL COLUMBIA GORGE AND SURROUNDING
  VALLEYS. HEAVY ICE ACCUMULATION WILL LIKELY BRING DOWN SOME
  LARGE BRANCHES AND POWER LINES. POWER OUTAGES MAY LAST MULTIPLE
  DAYS DEPENDING ON HOW WIDESPREAD THESE IMPACTS ARE. THIS EVENT
  WILL ONLY ADD TO THE EXISTING HEAVY SNOW AND ICE LOADING ON
  ROOFTOPS...WHICH MAY CAUSE SOME ROOFTOPS TO FAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AN ICE STORM WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE
EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF ICE ACCUMULATIONS
WILL MAKE TRAVEL DANGEROUS OR IMPOSSIBLE. TRAVEL IS STRONGLY
DISCOURAGED. COMMERCE WILL LIKELY BE SEVERELY IMPACTED. IF YOU
MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT...FOOD...AND WATER IN YOUR
VEHICLE IN CASE OF AN EMERGENCY. ICE ACCUMULATIONS AND WINDS WILL
LIKELY LEAD TO SNAPPED POWER LINES AND FALLING TREE BRANCHES THAT
ADD TO THE DANGER.

&&

$$

WAZ019-171500-
/O.CON.KPQR.IS.W.0002.170117T1400Z-170119T0200Z/
SOUTH WASHINGTON CASCADES-
836 PM PST MON JAN 16 2017

...ICE STORM WARNING REMAINS IN EFFECT FROM 6 AM TUESDAY TO 6 PM
PST WEDNESDAY BELOW 3000 FEET FOR THE SOUTH WASHINGTON CASCADES...

* TIMING...LIGHT FREEZING RAIN IS EXPECTED TO DEVELOP TUESDAY 
  MORNING WILL THEN INCREASE IN THE AFTERNOON. FREEZING RAIN 
  WILL BECOME HEAVY AT TIMES TUESDAY NIGHT AND WEDNESDAY. 
  TEMPERATURES WILL SLOWLY CLIMB TUESDAY NIGHT BUT MANY 
  LOCATIONS MAY NOT CLIMB ABOVE FREEZING UNTIL WEDNESDAY 
  AFTERNOON OR EVENING. PRECIPITATION WILL TAPER TO SHOWERS 
  WEDNESDAY NIGHT. 

* ICE ACCUMULATION...ICE ACCUMULATIONS OF ONE INCH TO ONE AND A 
  HALF INCHES EXPECTED TO BE FAIRLY WIDESPREAD.

* IMPACTS...HEAVY ICE ACCUMULATION WILL LIKELY BRING DOWN SOME 
  LARGE BRANCHES AND POWER LINES. POWER OUTAGES MAY LAST 
  MULTIPLE DAYS DEPENDING ON HOW WIDESPREAD THESE IMPACTS ARE. 
  THIS EVENT WILL ONLY ADD TO THE EXISTING HEAVY SNOW AND ICE 
  LOADING ON ROOFTOPS...WHICH MAY CAUSE SOME ROOFTOPS TO FAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AN ICE STORM WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE
EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF ICE ACCUMULATIONS
WILL MAKE TRAVEL DANGEROUS OR IMPOSSIBLE. TRAVEL IS STRONGLY
DISCOURAGED. COMMERCE WILL LIKELY BE SEVERELY IMPACTED. IF YOU
MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT...FOOD...AND WATER IN YOUR
VEHICLE IN CASE OF AN EMERGENCY. ICE ACCUMULATIONS AND WINDS WILL
LIKELY LEAD TO SNAPPED POWER LINES AND FALLING TREE BRANCHES THAT
ADD TO THE DANGER.

&&

$$

ORZ007-171500-
/O.CON.KPQR.ZR.Y.0003.170117T1200Z-170117T2200Z/
CENTRAL WILLAMETTE VALLEY-
INCLUDING THE CITIES OF...SALEM...MCMINNVILLE
836 PM PST MON JAN 16 2017

...FREEZING RAIN ADVISORY REMAINS IN EFFECT FROM 4 AM TO 2 PM PST
TUESDAY FOR THE CENTRAL WILLAMETTE VALLEY...

* TIMING...LIGHT FREEZING RAIN IS EXPECTED TO DEVELOP TUESDAY 
  MORNING AND END BY EARLY TUESDAY AFTERNOON. 

* TEMPERATURES...ARE EXPECTED TO SLOWLY CLIMB ABOVE FREEZING 
  AROUND MIDDAY TUESDAY...ENDING THE FREEZING RAIN THREAT 
  TUESDAY AFTERNOON.

* ICE ACCUMULATION...GENERALLY LESS THAN A TENTH OF AN INCH FOR 
  MOST OF THE VALLEY. HOWEVER A 0.10 TO 0.20 ICE ACCUMULATION 
  IS POSSIBLE TOWARDS NEWBERG AND MCMINNVILLE AND OTHER 
  LOCATIONS TOWARD THE COASTAL MOUNTAINS.

* IMPACTS...SEVERAL DAYS OF VERY COLD TEMPERATURES WILL MAKE 
  GROUND SURFACES LIKE ROADS AND SIDEWALKS VERY RECEPTIVE TO 
  ICE ACCUMULATION. IT MAY TAKE A COUPLE HOURS OF TEMPERATURES 
  ABOVE FREEZING TO COMPLETELY END THE FREEZING RAIN THREAT AT 
  ANY GIVEN LOCATION. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FREEZING RAIN ADVISORY MEANS THAT PERIODS OF FREEZING RAIN OR
FREEZING DRIZZLE WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS. SLOW DOWN AND USE CAUTION WHILE DRIVING.

&&

$$

ORZ008-171500-
/O.CON.KPQR.ZR.Y.0003.170117T1200Z-170117T1800Z/
SOUTH WILLAMETTE VALLEY-
INCLUDING THE CITIES OF...EUGENE...SPRINGFIELD...CORVALLIS...
ALBANY...LEBANON
836 PM PST MON JAN 16 2017

...FREEZING RAIN ADVISORY REMAINS IN EFFECT FROM 4 AM TO 10 AM
PST TUESDAY FOR THE SOUTH WILLAMETTE VALLEY...

* TIMING...LIGHT FREEZING RAIN IS EXPECTED TO DEVELOP TUESDAY 
  MORNING AND END BY TUESDAY AFTERNOON. 

* TEMPERATURES...ARE EXPECTED TO SLOWLY CLIMB ABOVE FREEZING 
  AROUND BY MIDDAY TUESDAY...ENDING THE FREEZING RAIN.

* ICE ACCUMULATION...GENERALLY LESS THAN A TENTH OF AN INCH.

* IMPACTS...SEVERAL DAYS OF VERY COLD TEMPERATURES WILL MAKE 
  GROUND SURFACES LIKE ROADS AND SIDEWALKS VERY RECEPTIVE TO 
  ICE ACCUMULATION. IT MAY TAKE A COUPLE HOURS OF TEMPERATURES 
  ABOVE FREEZING TO COMPLETELY END THE FREEZING RAIN THREAT AT 
  ANY GIVEN LOCATION. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FREEZING RAIN ADVISORY MEANS THAT PERIODS OF FREEZING RAIN OR
FREEZING DRIZZLE WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS. SLOW DOWN AND USE CAUTION WHILE DRIVING.

&&

$$

ORZ003-005-WAZ022-171500-
/O.CON.KPQR.ZR.Y.0003.170117T1000Z-170117T2200Z/
COAST RANGE OF NORTHWEST OREGON-LOWER COLUMBIA-I-
5 CORRIDOR IN COWLITZ COUNTY-
INCLUDING THE CITIES OF...VERNONIA...ST. HELENS...LONGVIEW...
KELSO
836 PM PST MON JAN 16 2017

...FREEZING RAIN ADVISORY REMAINS IN EFFECT FROM 2 AM TO 2 PM PST
TUESDAY BELOW 1000 FEET FOR THE COAST RANGE OF NORTHWEST
OREGON AND THE LOWER COLUMBIA AND I-5 CORRIDOR IN COWLITZ
COUNTY...

* TIMING...LIGHT FREEZING RAIN IS EXPECTED TO DEVELOP TUESDAY 
  MORNING AND END TUESDAY AFTERNOON. 

* TEMPERATURES...ARE EXPECTED TO SLOWLY CLIMB ABOVE FREEZING 
  AROUND MIDDAY TUESDAY...ENDING THE FREEZING RAIN THREAT 
  TUESDAY AFTERNOON.

* ICE ACCUMULATION...GENERALLY AROUND ONE TENTH OF AN INCH... BUT
  LOCALLY AROUND A QUARTER OF AN INCH IN DEEPER VALLEYS IN THE
  COAST RANGE.

* IMPACTS...SEVERAL DAYS OF VERY COLD TEMPERATURES WILL MAKE 
  GROUND SURFACES LIKE ROADS AND SIDEWALKS VERY RECEPTIVE TO 
  ICE ACCUMULATION. IT MAY TAKE A COUPLE HOURS OF TEMPERATURES 
  ABOVE FREEZING TO COMPLETELY END THE FREEZING RAIN THREAT AT 
  ANY GIVEN LOCATION. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FREEZING RAIN ADVISORY MEANS THAT PERIODS OF FREEZING RAIN OR
FREEZING DRIZZLE WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS. SLOW DOWN AND USE CAUTION WHILE DRIVING.

&&

$$

WAZ040-171500-
/O.CON.KPQR.ZR.Y.0003.170117T1200Z-170118T0200Z/
SOUTH WASHINGTON CASCADE FOOTHILLS-
INCLUDING THE CITIES OF...TOUTLE...LAKE MERWIN...COUGAR
836 PM PST MON JAN 16 2017

...FREEZING RAIN ADVISORY REMAINS IN EFFECT FROM 4 AM TO 6 PM PST
TUESDAY BELOW 1500 FEET FOR THE SOUTH WASHINGTON CASCADE
FOOTHILLS... 

* TIMING...SUBFREEZING AIR TRAPPED IN THE CASCADE VALLEYS WILL 
  LIKELY CAUSE FREEZING RAIN. VALLEY TEMPERATURES ARE EXPECTED 
  TO CLIMB ABOVE FREEZING AROUND MIDDAY TUESDAY...ENDING THE 
  FREEZING RAIN THREAT TUESDAY AFTERNOON. 

* ICE ACCUMULATION...VALLEY ICE ACCUMULATION AROUND ONE TO TWO 
  TENTHS OF AN INCH IS POSSIBLE. RIDGETOP TEMPERATURES WILL BE 
  SIGNIFICANTLY WARMER...SO NO SIGNIFICANT ICING IS EXPECTED 
  IN THE HIGHER TERRAIN.

* IMPACTS...SEVERAL DAYS OF VERY COLD TEMPERATURES WILL MAKE 
  GROUND SURFACES RECEPTIVE TO ICE ACCUMULATION. IT MAY TAKE A 
  COUPLE HOURS OF TEMPERATURES ABOVE FREEZING TO COMPLETELY 
  END THE FREEZING RAIN THREAT AT ANY GIVEN LOCATION. ICE 
  ACCUMULATION ON TREES AND POWER LINES MAY RESULT IN DOWNED 
  BRANCHES AND LINES...WHICH WOULD BRING THE THREAT OF POWER 
  OUTAGES TUESDAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FREEZING RAIN ADVISORY MEANS THAT PERIODS OF FREEZING RAIN OR
FREEZING DRIZZLE WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS. SLOW DOWN AND USE CAUTION WHILE DRIVING.

&&

$$

ORZ010-011-171500-
/O.CON.KPQR.ZR.Y.0003.170117T1400Z-170118T0200Z/
NORTHERN OREGON CASCADE FOOTHILLS-NORTHERN OREGON CASCADES-
INCLUDING THE CITIES OF...SANDY...ESTACADA...SWEET HOME
836 PM PST MON JAN 16 2017

...FREEZING RAIN ADVISORY REMAINS IN EFFECT FROM 6 AM TO 6 PM PST
TUESDAY BELOW 2000 FEET FOR THE NORTH OREGON CASCADES AND
FOOTHILLS...

* TIMING...FREEZING RAIN IS EXPECTED TO DEVELOP TUESDAY MORNING. VALLEY
  TEMPERATURES ARE EXPECTED TO SLOWLY CLIMB ABOVE FREEZING TUESDAY
  AFTERNOON... ENDING THE FREEZING RAIN THREAT TUESDAY EVENING.

* ICE ACCUMULATION...VALLEY ICE ACCUMULATION OF ONE TO TWO 
  TENTHS...WITH THE HIGHEST AMOUNTS TOWARD THE COLUMBIA RIVER 
  GORGE. RIDGETOP TEMPERATURES WILL BE SIGNIFICANTLY WARMER...
  SO NO SIGNIFICANT ICING IS EXPECTED IN THE HIGHER TERRAIN.

* IMPACTS...SEVERAL DAYS OF VERY COLD TEMPERATURES WILL MAKE 
  GROUND SURFACES LIKE ROADS AND SIDEWALKS VERY RECEPTIVE TO 
  ICE ACCUMULATION. IT MAY TAKE A COUPLE HOURS OF TEMPERATURES 
  ABOVE FREEZING TO COMPLETELY END THE FREEZING RAIN THREAT AT 
  ANY GIVEN LOCATION. ICE ACCUMULATION ON TREES AND POWER 
  LINES MAY RESULT IN DOWNED BRANCHES AND LINES...WHICH WOULD 
  BRING THE THREAT OF POWER OUTAGES TUESDAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FREEZING RAIN ADVISORY MEANS THAT PERIODS OF FREEZING RAIN OR
FREEZING DRIZZLE WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS. SLOW DOWN AND USE CAUTION WHILE DRIVING.

&&

$$

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Western Regional Climate Center, wrcc@dri.edu