Damaging Wind in Oregon, August 13, 2004

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OREGON
215 PM PDT FRI AUG 13 2004

.SHORT TERM...TONIGHT THROUGH MONDAY...MID/UPPER LEVEL MOISTURE
IS BEGINNING TO INCREASE ACROSS CENTRAL OR ESPECIALLY AS WEAK
WAVES/MOISTURE MIGRATE NORTHWARD IN SOUTHERLY FLOW ALOFT. MID/UPPER
LEVEL CLDS ARE MOVING INTO THE NE MTNS OF OR...WITH ENHANCED CU
ACROSS CENTRAL SECTIONS...AND A FEW LIGHTNING STRIKES APPROACHING
THE GRANT/HARNEY COUNTY LINE. FURTHER NORTH...TEMPS ARE NEAR 100
DEGREES ACROSS MUCH OF THE LOWER ELEVATIONS IN NORTHERN OR...WITH
PENDLETON AIRPORT 101 DEGREES AT 2 PM.

FOR TONIGHT THRU SAT NIGHT...ATMOSPHERE WILL CONTINUE TO MOISTEN
FROM THE TOP DOWN...WITH MIDDLE LEVELS MOISTENING ACROSS CENTRAL OR
BY SAT AFTN/EVE...AND SAT NIGHT ACROSS NORTHERN OR/SE WA. INSTABILITY
WILL INCREASE WITH THE APPROACH OF WAVES...WITH A WEAK IMPULSE
TNGT...AND A STRONGER WAVE SAT/SAT NIGHT. WILL USE ISOLATED TSTMS
FOR CENTRAL OR TNGT...INCREASING TO CHC CATEGORY FOR SAT WITH
INCREASED INSTABILITY/LIFT/MID-LEVEL MOISTURE. TSTMS WILL INITIALLY
PRODUCE LITTLE RAINFALL WITH THE DRY LOWER LEVELS...BUT WILL BECOME
WETTER SAT NIGHT ACROSS MOST AREAS. A FIRE WEATHER WATCH HAS BEEN
ISSUED FOR CENTRAL OR SAT AFTN/EVE AND FOR NORTHERN OR/SE WA SAT
NIGHT FOR SCATTERED TSTMS AFTER LONG HOT/DRY PERIOD...AS STORMS WILL
NOT BE THAT WET AND ANY STRIKE COULD RESULT IN FIRE STARTS. TEMP
WISE...ANOTHER HOT DAY IN STORE ACROSS NORTHERN OR/SE WA WITH MANY
LOCATIONS IN THE MID/UPPER 90S TO PERHAPS 100 OR SO LOWER COLUMBIA
BASIN.

SUN/MON...THE WEATHER PATTERN WILL NOT UNDERGO AS MUCH CHANGE AS
PREVIOUSLY THOUGHT...AS THE RIDGE AXIS WILL RESIDE JUST EAST OF THE
AREA...WITH WEAK WAVES CROSSING IN SOUTHERLY FLOW. THIS...ALONG WITH
SOME MID-LEVEL MOISTURE WILL RESULT IN SLIGHT CHC OF TSTMS...MAINLY
ACROSS MTN LOCATIONS. TEMPS WILL ONLY COOL SLIGHTLY...WITH 90S THE
RULE.

.LONG TERM...MONDAY NIGHT THROUGH FRIDAY...HIGH PRESSURE ALOFT WILL
REBUILD SLOWLY BACK OVER THE PACIFIC NORTHWEST MONDAY NIGHT AND
TUESDAY. HOWEVER IT WILL NOT BE AS STRONG AS THE CURRENT HIGH AND
THEREFORE WILL ALLOW A WEATHER DISTURBANCE TO PENETRATE IT MONDAY
NIGHT THROUGH TUESDAY EVENING. THE ATMOSPHERE WILL BE UNSTABLE ON
TUESDAY AS WELL. THIS COMBINATION WILL ALLOW ISOLATED SHOWERS AND
THUNDERSTORMS TO DEVELOP...HOWEVER THEY WILL BE CONFINED MAINLY TO
THE MOUNTAINOUS AREAS OF CENTRAL AND NORTHEAST OREGON. THE HIGH
PRESSURE WILL THEN STRENGTHEN ON WEDNESDAY AND PERSIST THROUGH THE
END OF THE EXTENDED PERIOD. THIS WILL KEEP ANY MOISTURE PUSHING INTO
IT TO GO TO THE NORTH OR TO THE SOUTH OF THE FORECAST AREA.
TEMPERATURES WILL REMAIN ABOVE NORMAL THROUGH THE PERIOD DUE TO THE
HIGH PRESSURE ALOFT THIS TIME OF YEAR.

&&

.PRELIMINARY POINT TEMPS/POPS...
PENDLETON (AIRPORT) 067 100 067 097 / 005 010 030 020
WALLA WALLA         069 100 068 098 / 005 010 030 020
TRI-CITIES          061 102 061 100 / 000 010 030 020
YAKIMA              061 098 060 095 / 000 010 030 020
HERMISTON           060 101 062 099 / 000 010 030 020
ELLENSBURG          062 100 061 095 / 000 010 030 020
REDMOND             058 095 055 092 / 020 030 030 020
LA GRANDE           056 099 055 096 / 010 020 020 020
JOHN DAY            058 099 056 096 / 010 030 030 020
THE DALLES          071 097 069 094 / 010 020 030 020
&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FIRE WEATHER WATCH CENTRAL OR ZONES 609/610/611/630
     SAT AFTN/EVE...NORTHERN OR ZONES 631/632/633 SAT NIGHT.
WA...FIRE WEATHER WATCH SOUTHEAST WA ZONES 675/681 SAT NIGHT.
&&

ALLEN/RSC

HAZARDOUS WEATHER OUTLOOK...UPDATED FOR FIRE WEATHER WATCH
NATIONAL WEATHER SERVICE PENDLETON OREGON
245 PM PDT FRI AUG 13 2004

ORZ041>050-WAZ024>030-141200-
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-
228 PM PDT FRI AUG 13 2004

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

ISOLATED THUNDERSTORMS
     NORTHWEST BLUE MOUNTAINS, CENTRAL OREGON, BLUE MOUNTAINS,
     OCHOCO-JOHN DAY HIGHLANDS, WALLOWA COUNTY

EXCESSIVE HEAT
     EASTERN COLUMBIA RIVER GORGE (WA), KITTITAS VALLEY, YAKIMA
     VALLEY, LOWER COLUMBIA BASIN (WA), FOOTHILLS OF THE BLUE
     MOUNTAINS (WA), EASTERN COLUMBIA RIVER GORGE (OR), NORTH CENTRAL
     OREGON, LOWER COLUMBIA BASIN (OR), FOOTHILLS OF THE BLUE
     MOUNTAINS (OR), JOHN DAY BASIN

ISOLATED THUNDERSTORMS WILL CONTINUE ACROSS CENTRAL OREGON...THE
OCHOCO-JOHN DAY HIGHLANDS...AND THE MOUNTAINS OF NORTHEAST OREGON
AND SOUTHEAST WASHINGTON THIS EVENING.  THUNDERSTORMS WILL TAPER OFF
OVERNIGHT. THE MAIN THREAT FROM THUNDERSTORMS WILL BE GUSTY AND
ERRATIC WINDS.  TEMPERATURES HAVE SOARED INTO THE 90S TO AROUND 105
THIS AFTERNOON ACROSS THE REGION...AND PEOPLE ARE ENCOURAGED TO STAY
INDOORS AND DRINK PLENTY OF FLUIDS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH FRIDAY

SCATTERED THUNDERSTORMS AND A FIRE WEATHER WATCH SATURDAY AFTERNOON
AND SATURDAY NIGHT
          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, EASTERN COLUMBIA RIVER GORGE
          (OR), NORTH CENTRAL OREGON, CENTRAL OREGON, LOWER COLUMBIA
          BASIN (OR), FOOTHILLS OF THE BLUE MOUNTAINS (OR), BLUE
          MOUNTAINS, JOHN DAY BASIN, OCHOCO-JOHN DAY HIGHLANDS

ISOLATED THUNDERSTORMS SATURDAY
          GRANDE RONDE VALLEY, WALLOWA COUNTY

THUNDERSTORMS SUNDAY
          CENTRAL OREGON, BLUE MOUNTAINS, OCHOCO-JOHN DAY HIGHLANDS,
          WALLOWA COUNTY

SCATTERED THUNDERSTORMS WILL DEVELOP IN CENTRAL OREGON AND ALONG THE
EAST SLOPES OF THE OREGON CASCADES SATURDAY AFTERNOON AND EVENING.
SCATTERED THUNDERSTORMS WILL MOVE ACROSS THE COLUMBIA BASIN...THE
BLUE MOUNTAINS...AND THE EAST SLOPES OF THE SOUTHERN WASHINGTON
CASCADES SATURDAY NIGHT.  DUE TO A PROLONGED PERIOD OF DRY
CONDITIONS FOLLOWED BY SCATTERED THUNDERSTORMS SATURDAY AFTERNOON
AND SATURDAY NIGHT...A FIRE WEATHER WATCH HAS BEEN ISSUED FOR THESE
AREAS.  PLEASE REFER TO THE LATEST FIRE WEATHER WATCH PDXFWFPDT
WWUS86 KPDT FOR DETAILS.  CONTACT YOUR LOCAL FOREST OR LAND
MANAGEMENT AGENCY FOR CURRENT FIRE DANGER CONDITIONS IN YOUR AREA.
ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED SUNDAY AND EARLY
NEXT WEEK. DRY CONDITIONS WILL RETURN WEDNESDAY THROUGH FRIDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED SATURDAY.

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.