561
FXUS66 KPDT 090933
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
230 AM PDT WED JUL 9 2008
SHORT TERM...TODAY THROUGH THURSDAY NIGHT
A BROAD HIGH PRESSURE
RIDGE WILL PERSIST TODAY OVER THE REGION...HOWEVER IT WILL BE
WEAKENING AS THE DAY PROGRESSES. THE FLOW WILL THEN BECOME WEST TO
NORTHWEST TONIGHT...AND THEN CYCLONIC ON THURSDAY AS A WAVE IN THE
FLOW MOVES ACROSS NORTHERN WASHINGTON STATE AND SOUTHERN BC. THIS
WAVE WILL HAVE VERY LITTLE IF ANY MOISTURE...HOWEVER A STRONG 120 KT
JET STREAM WILL SAG OVER THE PACIFIC NORTHWEST BY THURSDAY
AFTERNOON. THE ATMOSPHERIC MIXING COMBINED WITH DECREASING STABILITY
WILL ALLOW SOME OF THOSE WINDS TO MIX DOWN TO THE SURFACE THURSDAY
AFTERNOON AND EVENING. THIS WILL CAUSE BREEZY TO WINDY CONDITIONS TO
DEVELOP IN MOST AREAS OF THE CWA. THE STRONGEST WINDS WILL BE OVER
THE CASCADE PASSES/EAST SLOPES AS WELL AS IN THE EASTERN COLUMBIA
RIVER GORGE...THE WESTERN LOWER COLUMBIA BASIN AND THE KITTITAS
VALLEY. WIND GUSTS ARE EXPECTED TO REACH AT LEAST 30 TO 40 KTS IN
THE KITTITAS VALLEY AND IN THE EASTERN COLUMBIA GORGE. THIS IS JUST
UNDER ADVISORY CRITERIA. WHILE THE POSSIBILITY EXISTS FOR WIND
ADVISORY TYPE WINDS IN THESE AREAS WILL HOLD OFF ON ANY ISSUANCE OF
A WIND ADVISORY FOR NOW AND WAIT FOR BETTER CONFIDENCE WITH ANOTHER
MODEL RUN OR TWO. TODAY WILL BE THE WARMEST DAY OF THE WEEK AND THEN
A COOLING TREND WILL BEGIN ON THURSDAY AND CONTINUE THROUGH THE REST
OF THE WEEK BEHIND A COLD FRONT WHICH WILL ALSO MOVE ACROSS THE
REGION ON THURSDAY. 88
LONG TERM...FRIDAY THROUGH TUESDAY
A RIDGE OF HIGH PRESSURE WILL
INFLUENCE THE AREAS WEATHER THIS FRIDAY AND CONTINUE INTO THIS
WEEKEND WITH A WARMING TREND EXPECTED TO RETURN. BY THIS WEEKEND
AFTERNOON TEMPS WILL CLIMB AGAIN INTO THE 90S. A DISTURBANCE ALONG
WITH A DRY COOL FRONT SHUD DRIFT ACROSS THE REGION MONDAY AND HIGH
TEMPS WILL BE SEVERAL DEGREES COOLER INTO TUESDAY.
AVIATION
VFR CONDITIONS WILL PERSIST FOR THE NEXT 24 HOURS ACROSS
ALL TAF SITES.
FIRE WEATHER...THE COMBINATION OF VERY LOW RELATIVE HUMIDITIES
DEVELOPING BREEZY TO WINDY CONDITIONS AND DRY FUELS WILL CREATE A
STRONG POTENTIAL FOR CRITICAL FIRE WEATHER CONDITIONS BEGINNING THIS
AFTERNOON AND PERSISTING THROUGH THROUGH THURSDAY EVENING. A FIRE
WEATHER WATCH FOR LOW RH AND WINDS FOR THE COLUMBIA RIVER GORGE AND
SURROUNDING SLOPES (FWZ 609) WILL REMAIN IN EFFECT FOR THE PERIOD
FROM THIS AFTERNOON THROUGH THURSDAY EVENING. 88
PRELIMINARY POINT TEMPS/POPS
PDT 96 64 89 56 / 0 0 0 0
ALW 96 66 88 58 / 0 0 0 0
PSC 99 61 92 53 / 0 0 0 0
YKM 96 61 89 53 / 0 0 0 0
HRI 99 64 91 56 / 0 0 0 0
ELN 93 63 84 55 / 0 0 0 0
RDM 97 53 89 45 / 0 0 0 0
LGD 94 57 88 49 / 0 0 0 0
GCD 95 58 90 50 / 0 0 0 0
DLS 97 67 88 59 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
OR...FIRE WEATHER WATCH FROM THIS AFTERNOON THROUGH THURSDAY EVENING
FOR ORZ609.
WA...FIRE WEATHER WATCH FROM THIS AFTERNOON THROUGH THURSDAY EVENING
FOR WAZ609.
TI:GGG
FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON
88/97/97
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