007
FXUS66 KPDT 310506
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1006 PM PDT SAT AUG 30 2025
UPDATED AVIATION...06Z TAFS
VFR CONDITIONS WILL PERSIST THROUGH
THE FORECAST PERIOD. WINDS WILL BE BELOW 10 KTS WITH THE
EXCEPTION OF AT DLS WHERE WINDS WILL BE 10-15 KTS GUSTING TO
AROUND 20 KTS THOROUGH AROUND 08Z BEFORE SETTING TO BELOW 10 KTS.
CIGS WILL RANGE FROM BKN 15-25KFT. BENNESE/90
PREV DISCUSSION... /ISSUED 125 PM PDT SAT AUG 30 2025/
DISCUSSION...A RELATIVELY COMPLEX SYNOPTIC PATTERN IS SETTING UP
FOR THE PACIFIC NORTHWEST FOR THE NEXT WEEK. SATELLITE IMAGERY
CURRENTLY SHOWS A BROAD LOW PRESSURE SYSTEM CIRCULATING JUST OFF
THE COAST. MODELS HAVE THIS LOW MEANDERING TOWARDS THE OLYMPIC
PENINSULA BEFORE RETROGRADING DURING THE WEEK, LEAVING OUR
FORECAST AREA CAUGHT BETWEEN TWO DEEP TROUGHS. A QUASI-RIDGE
PATTERN RESULTS, WHICH WILL CAUSE A DISTINCT WARM-UP THROUGH THE
MIDWEEK. SO LONG AS THIS OFFSHORE LOW REMAINS IN OUR AREA OF
INFLUENCE, HOWEVER, EXPECT MILD GAP FLOWS AND PERSISTENT CHANCES
FOR ISOLATED SHOWERS AND THUNDERSTORMS OVER AT LEAST THE NEXT
SEVERAL DAYS.
CURRENTLY, RADAR SHOWS SOME LIGHT SHOWER AND STORM ACTIVITY
DEVELOPING ACROSS UNION AND WALLOWA COUNTY. CAMS ARE NOT TOO BULLISH
ON COVERAGE THIS AFTERNOON AND EVENING, LIKELY DUE TO THE LOW SHEAR
AND SUBSIDENCE ALOFT AS WEAK RIDGING FORMS AHEAD OF THIS OFFSHORE
LOW, BUT THE INGREDIENTS STILL REMAIN FOR AT LEAST ISOLATED ACTIVITY
FOR THE AREA. WINDS REMAIN RELATIVELY LIGHT, HOWEVER GAP FLOWS ARE
PICKING UP ABOVE GUIDANCE FOR THE DALLES THIS AFTERNOON, SUGGESTING
A STRONGER CROSS-CASCADE GRADIENT THAN WHAT MODELS ARE PICKING UP ON
(WHICH MAKES SENSE. THERE IS A LOW OFFSHORE AFTER ALL). EXPECT MILD
BREEZES DOWNSLOPE OF THE CASCADES THIS AFTERNOON AS WELL AS
TOMORROW, COMBINING WITH LOW RHS TO MAKE FOR ELEVATED FIRE WEATHER
CONCERNS. DON'T THINK WINDS WILL BE STRONG NOR WIDESPREAD ENOUGH TO
WARRANT ANY HEADLINES, BUT ACTIVE INCIDENTS (LIKE THE FLAT FIRE)
WILL CERTAINLY BE AFFECTED BY THESE CONDITIONS.
FAVORABLE ASCENT THEN SHIFTS TO THE CENTRAL WASHINGTON CASCADES FOR
TOMORROW, ALBEIT ONLY ENOUGH TO SUPPORT SLIGHT (15-20%) CHANCES FOR
SHOWERS AND THUNDERSTORMS. FOCUS THEN SHIFTS TO THE BUILDING HEAT
BEYOND LABOR DAY, BUT BEFORE THEN, THIS LOW LOOKS TO CIRCULATE A
SECONDARY TROUGH FROM SOCAL INTO THE REGION TUESDAY NIGHT INTO
WEDNESDAY. MODELS AREN'T DEPICTING THIS SYSTEM TOO CLEANLY AS OF
YET, BUT WILL CERTAINLY BE SOMETHING TO KEEP AN EYE ON AS THE DAYS
PROGRESS. BY THEN, THE HEAT WILL REALLY START RAMPING UP, WITH
DECENT PROBABILITIES (50-60%) FOR THE LOWER COLUMBIA BASIN TO SEE
HIGH TEMPS ECLIPSE 100 DEGREES, WHICH WOULD FLIRT WITH DAILY RECORDS
GIVEN THE TIME OF YEAR. EVANS/74
PRELIMINARY POINT TEMPS/POPS
PDT 63 94 61 94 / 0 0 10 0
ALW 68 97 68 97 / 0 0 10 0
PSC 62 97 62 96 / 0 0 10 0
YKM 63 95 63 95 / 10 10 10 0
HRI 62 96 63 96 / 0 0 10 0
ELN 58 94 60 93 / 10 10 20 0
RDM 51 92 50 93 / 10 0 0 0
LGD 60 94 60 96 / 10 0 0 0
GCD 61 95 60 97 / 0 0 10 0
DLS 63 92 63 94 / 10 0 10 0
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
SHORT TERM...74
LONG TERM....74
AVIATION...90
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