Damaging Wind in Washington, October 17, 2004

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OREGON
220 PM PDT SUN OCT 17 2004

.SHORT TERM...TONIGHT THROUGH WEDNESDAY...MODELS IN FAIRLY GOOD
AGREEMENT ON SWINGING TROUGH THROUGH AREA TONIGHT AND EARLY MONDAY
AND DIGGING NEXT TROUGH ALONG WEST COAST TUESDAY AND WEDNESDAY.
RATHER VIGOROUS SHORT WAVE OVER SOUTHWEST OREGON WITH CURRENT TROUGH
KICKING OFF SHOWERS AND ISOLATED THUNDERSTORMS IN CENTRAL OREGON AND
EAST SLOPES OF WASHINGTON CASCADES WHICH SHOULD MOVE ACROSS THE REST
OF THE AREA DURING THE LATE AFTERNOON AND EVENING. SNOW LEVELS
DROPPING TO AROUND 5000 FT WITH ABOUT 2 INCHES SNOW ABOVE 6000FT.
PRESSURE GRADIENT TO TIGHTEN AS SURFACE LOW TRACKS INTO NORTHEAST
WASHINGTON.  EXPECT WINDS 20-30 WITH GUSTS 35 MPH TONIGHT IN THE
BASIN. A FEW SHOWERS TO DEVELOP IN LEFTOVER INSTABILITY/MOISTURE ON
MONDAY...BUT THE NEXT SIGNIFICANT PRECIPITATION WILL ARRIVE TUESDAY
AND CONTINUE INTO WEDNESDAY AS DIGGING OFFSHORE MOVES EAST JUST
SOUTH OF FORECAST AREA. BELOW NORMAL DAYTIME TEMPERATURES THE NEXT
FEW DAYS WITH CLOUDS AND UPPER LEVEL TROUGH.
  HULL

.LONG TERM...WEDNESDAY NIGHT THROUGH SUNDAY. THE COOL AND SHOWERY
CONDITIONS WILL CONTINUE THROUGH THE EXTENDED PERIOD. A BRIEF BREAK
IN PRECIPITATION IS EXPECTED WEDNESDAY NIGHT...BUT THE PATTERN WILL
QUICKLY CHANGE TO A WESTERLY PROGRESSIVE FLOW.  THE TIMING OF
INDIVIDUAL WAVES WILL BE A CHALLENGE TO FORECAST...BUT A THREAT OF
SHOWERS IS EXPECTED EACH DAY.  SNOW LEVELS WILL REMAIN NEAR
4500-5500 FEET THROUGHOUT THE PERIOD.  SMITH

&&

.PRELIMINARY POINT TEMPS/POPS...
PENDLETON (AIRPORT) 045 056 039 054 / 070 030 030 050
WALLA WALLA         049 058 042 056 / 070 030 020 050
TRI-CITIES          044 061 040 059 / 060 020 020 040
YAKIMA              037 059 038 057 / 030 020 030 060
HERMISTON           045 061 040 059 / 060 020 020 040
ELLENSBURG          040 056 037 053 / 030 020 030 060
REDMOND             034 054 035 050 / 040 030 040 060
LA GRANDE           041 053 035 054 / 080 030 030 050
JOHN DAY            038 055 036 054 / 070 030 040 060
THE DALLES          044 059 040 061 / 050 040 030 060
&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...NONE.
&&

79

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OREGON
247 PM PDT SUN OCT 17 2004

ORZ041>050-WAZ024>030-181200-
NORTH CENTRAL OREGON-CENTRAL OREGON-LOWER COLUMBIA BASIN (OR)-
FOOTHILLS OF THE BLUE MOUNTAINS (OR)-BLUE MOUNTAINS-JOHN DAY BASIN-
OCHOCO-JOHN DAY HIGHLANDS-GRANDE RONDE VALLEY-WALLOWA COUNTY-
EASTERN COLUMBIA RIVER GORGE (WA)-
EAST SLOPES OF THE SOUTHERN CASCADES-KITTITAS VALLEY-YAKIMA VALLEY-
LOWER COLUMBIA BASIN (WA)-FOOTHILLS OF THE BLUE MOUNTAINS (WA)-
NORTHWEST BLUE MOUNTAINS-
247 PM PDT SUN OCT 17 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.

.DAY ONE...REST OF TODAY AND TONIGHT

ISOLATED THUNDERSTORMS
     LOWER COLUMBIA BASIN (WA), FOOTHILLS OF THE BLUE MOUNTAINS (WA),
     NORTHWEST BLUE MOUNTAINS, LOWER COLUMBIA BASIN (OR), FOOTHILLS
     OF THE BLUE MOUNTAINS (OR), BLUE MOUNTAINS, JOHN DAY BASIN,
     OCHOCO-JOHN DAY HIGHLANDS, GRANDE RONDE VALLEY, WALLOWA COUNTY

A COLD FRONT WILL TRACK ACROSS EASTERN WASHINGTON AND EASTERN OREGON
LATE THIS AFTERNOON AND EVENING.  THE FRONT WILL BRING A COMBINATION
OF HEAVY SHOWERS...ISOLATED THUNDERSTORMS...AND WINDS GUSTING TO 40
MPH IN SOME AREAS.  GUSTY WINDS WILL RESULT IN LOCAL BLOWING DUST.
THUNDERSTORMS...SHOWERS...AND WINDS WILL TAPER OFF OVERNIGHT AS THE
FRONT EXITS THE REGION.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SUNDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

A COOL AND UNSETTLED PATTERN WILL CONTINUE AS A SERIES OF FAST
MOVING SYSTEMS MOVE THROUGH THE REGION.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED.

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

PROTOTYPE GRAPHICAL FORECASTS OF WEATHER HAZARDS OUT TO SEVEN DAYS
ARE DISPLAYED ON THE WORLD WIDE WEB AT:

WWW.WRH.NOAA.GOV/PENDLETON/FORECAST/HWOGRAPHICS/HWOGRAPHICS.PHP

ALL LETTERS IN THE ABOVE URL ARE LOWER CASE...EXCEPT THE G IN
HWOGRAPHICS AND THE G IN HWOGRAPHICS.PHP.