Snow Advisory 21, NWS Portland, OR

000 
WWUS46 KPQR 210358
WSWPQR

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE PORTLAND OR
858 PM PDT SAT OCT 20 2007

ORZ011-WAZ019-210500-
/O.EXP.KPQR.SN.Y.0021.000000T0000Z-071021T0400Z/
NORTHERN OREGON CASCADES-SOUTH WASHINGTON CASCADES-
INCLUDING THE CITIES OF...GOVERNMENT CAMP...DETROIT...
SANTIAM PASS...COLDWATER RIDGE VISITORS CENTER...MOUNT ST. HELENS
858 PM PDT SAT OCT 20 2007

...SNOW ADVISORY WILL EXPIRE AT 9 PM PDT THIS EVENING
FOR THE NORTH OREGON AND SOUTH WASHINGTON CASCADES...

THE SNOW ADVISORY WILL EXPIRE AT 9 PM PDT THIS EVENING. 

SHOWERS ARE STILL MOVING INTO THE CASCADES THIS EVENING BUT THEY
ARE MORE WIDELY SCATTERED AND SNOW IS EXPECTED TO BE MORE
LOCALIZED IN THE 1 TO 2 INCH AMOUNTS FOR THE REST OF THE NIGHT.
CONSIDERABLE SNOW FELL AND ACCUMULATED IN THE PAST 24 HOURS IN
THE CASCADES AND ROADS AND PASSES MAY STILL BE SNOW PACKED AND
HAZARDOUS. 





$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
244 PM PDT SAT OCT 20 2007

.SYNOPSIS...AN UPPER LEVEL TROUGH OVER THE WESTERN U.S. WILL CONTINUE
TO MOVE EAST...AS AN UPPER LEVEL RIDGE BUILDS OVER THE PACIFIC
NORTHWEST. SHOWERS ASSOCIATED WITH THE TROUGH WILL TAPER OFF THIS
EVENING. A WARM FRONT WILL BRUSH THE NORTHWEST PORTION OF THE
FORECAST AREA SUNDAY AND MAY GENERATE A FEW BRIEF SHOWERS.
CONSIDERABLY DRIER CONDITIONS ARE LIKELY IN THE COMING DAYS AS HIGH
PRESSURE BUILDS OVER THE AREA. FOG IS LIKELY DURING THE LATE NIGHT
AND MORNING HOURS THROUGH MIDWEEK. CLOUD COVER IS EXPECTED TO
INCREASE TOWARD THE END OF THE WEEK AS WEATHER SYSTEMS PASS TO THE
NORTH OF THE AREA.
&&

.SHORT TERM...INFRARED SATELLITE SHOWS HIGHEST INSTABILITY SHOWERS
MOVING ONSHORE AND DISSIPATING. UPPER LEVEL FLOW TURNING
NORTHWESTERLY AS RIDGE APPROACHES THE AREA. THERE IS STILL LOTS OF
PRECIPITATION ON THE RADAR...BUT SHOWERS APPEAR TO BE WEAKENING IN
GENERAL. PLENTY OF PRECIPITATION MOVING INTO THE MOUNTAINS AT THIS
TIME BUT IT APPEARS TO BE DECREASING PRETTY RAPIDLY AS THE WESTERLY
FLOW BEGINS TO TURN MORE NORTHWESTERLY. HEAVY SNOW WARNING MAY NEED
TO GO A COUPLE MORE HOURS INTO THE EVENING TO CATCH THE LAST OF THE
INSTABILITY SHOWERS. HOWEVER...FEEL THAT THE BULK OF THE SNOW HAS
FALLEN AS OF 2 PM.

WARM FRONT BRUSHES THE NORTHWEST PORTION OF THE FORECAST AREA SUNDAY
FOR A CHANCE OF SHOWERS OVER THE NORTH OREGON AND SOUTH WASHINGTON
COAST..AND PERHAPS THE COAST RANGE. ASIDE FROM SOME CLOUDS OVER THE
NORTH VALLEY AND NORTH OREGON AND SOUTH WASHINGTON CASCADES...THAT
SHOULD BE THE EXTENT OF THE WEATHER ISSUES FOR THE REMAINDER OF THE
WEEKEND. KELSON

.LONG TERM...HIGH PRESSURE BUILDING OVER THE FORECAST AREA THIS WEEK
FOR FOG...AS PREVIOUSLY STATED IN AFD. WITH LITTLE CHANGE IN MODELS
AND THE FORECAST SO THERE ISNT MUCH TO ADD AT THIS POINT.
INTERESTING HOW WARM THE MODELS HAVE THE 850 TEMPERATURES
RISING...NEAR 20 DEGREES CONSIDERING THE PATTERN WEVE BEEN
IN...ITS A BIT HARD TO BELIEVE. HOWEVER AS PREVIOUSLY STATED...FOG
WILL PROBABLY KEEP A LID ON THE SURFACE TEMPS. KELSON
&&

.AVIATION...SHOWERS BEGINNING TO TAPER OFF AS MOST OF THE UNSTABLE
AIR DRIFTS EAST OF THE CASCADES. IT IS UNLIKELY THAT ANY FURTHER
CONVECTION WILL DEVELOP THIS AFTERNOON. THOUGH SHOWERS WILL REMAIN
INTO THE EARLY EVENING. EXPECT MAINLY VFR CONDITIONS WITH MVFR CIGS
AND VISIBILITIES NEAR HEAVIER SHOWERS. CONDITIONS WILL STABILIZE
LATE TONIGHT AS HIGH PRESSURE BEGINS TO BUILD OVERHEAD. VALLEY FOG
WILL THEN BECOME A PROBLEM. BELIEVE ONSET WILL BE AROUND 10Z AS NEAR
SURFACE LAYER IS QUITE SATURATED FROM THIS WEEKS RAIN. WOLFE

KPDX AND APPROACHES...VFR CONDITIONS EXPECTED ACROSS ALL APPROACHES
THIS AFTERNOON WITH MVFR CEILINGS AND VISIBILITIES ASSOCIATED WITH
STRONGER SHOWERS. FOG WILL LIKELY BECOME A HINDRANCE WITH 80
PERCENT LIKELIHOOD OF DEVELOPMENT BY 10Z. EXPECT LIFR TO IFR
CONDITIONS IN FOG.
WOLFE

&&

.MARINE...SEAS AROUND 23 FT AND MAY BRIEFLY BUILD TO 25 FT THIS
AFTERNOON. SEAS SHOULD FALL BELOW 20 FT OVER ALL WATERS BY 05Z. WILL
MAINTAIN THE HIGH SURF ADVISORY FOR TODAY. WIND AND SEAS WILL
DECREASE TONIGHT AS WE ENTER INTO A QUIETER WEATHER WEEK IN THE
PACIFIC.
WOLFE

&&

.PQR WATCHES/WARNINGS/ADVISORIES...
WA/OR...SMALL CRAFT ADVISORY FOR WINDS FROM CAPE SHOALWATER TO
         FLORENCE THROUGH THIS AFTERNOON.
        SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS FROM CAPE SHOALWATER
         TO FLORENCE THROUGH SUNDAY MORNING.
        SMALL CRAFT ADVISORY FOR ROUGH COLUMBIA BAR THROUGH SUNDAY

         MORNING.
        HIGH SURF ADVISORY FOR THE SOUTH WASHINGTON AND NORTH AND
         CENTRAL OREGON COASTS THROUGH THIS EVENING.
&&

.PRELIMINARY POINT POPS (PROBABILITY OF MEASURABLE PRECIPITATION)
AST 4321--  PDX 421---  SLE 411---  EUG 41----

MORE WEATHER INFORMATION ONLINE AT...
HTTP://WEATHER.GOV/PORTLAND

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.

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PORTLAND OR
532 AM PDT SAT OCT 20 2007

ORZ011-013-WAZ019-211300-
NORTHERN OREGON CASCADES-CASCADES IN LANE COUNTY-
SOUTH WASHINGTON CASCADES-
532 AM PDT SAT OCT 20 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
OREGON AND SOUTHWEST WASHINGTON.

.DAY ONE...TODAY AND TONIGHT
SIGNIFICANT SNOWFALL IS POSSIBLE TODAY. REFER TO THE LATEST
WEATHER MESSAGE (PDXWSWPQR) FOR DETAILS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...
SPOTTER REPORTS OF SNOW ARE ENCOURAGED TODAY.

ORZ001-002-PZZ210-211300-
NORTH OREGON COAST-CENTRAL OREGON COAST-COLUMBIA RIVER BAR-
532 AM PDT SAT OCT 20 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
OREGON AND PZ.

.DAY ONE...TODAY AND TONIGHT
HIGH SURF ADVISORY FOR TODAY AND TONIGHT...REFER
TO THE LATEST WEATHER MESSAGE (PDXCFWPQR)

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...
SPOTTER REPORTS ARE NOT LIKELY TO BE NEEDED TODAY.

ORZ003>010-012-014-WAZ020>023-039-040-211300-
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-
CASCADE FOOTHILLS IN LANE COUNTY-UPPER HOOD RIVER VALLEY-
WILLAPA HILLS-SOUTH WASHINGTON COAST-I-
5 CORRIDOR IN COWLITZ COUNTY-GREATER VANCOUVER AREA-
SOUTH WASHINGTON CASCADE FOOTHILLS-
532 AM PDT SAT OCT 20 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
OREGON AND SOUTHWEST WASHINGTON.

.DAY ONE...TODAY AND TONIGHT
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...
SPOTTER REPORTS ARE NOT LIKELY TO BE NEEDED TODAY.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PORTLAND OR
1048 AM PDT SAT OCT 20 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0118 PM     TSTM WND GST     3 ESE HUBBARD           45.17N 122.75W
10/19/2007  M49.00 MPH       CLACKAMAS          OR   TRAINED SPOTTER

            MEASURED BY DAVIS WX INSTRUMENT

0130 PM     TSTM WND DMG     HUBBARD                 45.18N 122.81W
10/19/2007                   MARION             OR   BROADCAST MEDIA

            MEDIA REPORTS INDICATE THAT THREE GREENHOUSES WERE
            DAMAGED IN THE TOWN OF HUBBARD APPROXIMATELY AROUND 130
            PM.

0845 AM     TSTM WND DMG     2 E HUBBARD             45.18N 122.76W
10/20/2007                   MARION             OR   NWS STORM SURVEY

            FOUR GREENHOUSES DAMAGED. 8-10 INCH TREE BROKEN THOUGH
            TREE WAS PREVIOUSLY SPLIT. SCATTERED DEBRIS.

&&

JWOLFE