350
FXUS66 KPDT 112325
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
425 PM PDT SUN OCT 11 2026
KEY MESSAGES
- COLD, DRY AIR MASS CONTINUES TO BRING NEAR-FREEZING TO SUB
FREEZING MORNING TEMPERATURES INTO EARLY THIS WEEK
- LIGHT RAIN-SNOW SHOWERS FOR THE WALLOWA MOUNTAINS AND
SOUTHERN BLUE MOUNTAINS TONIGHT INTO MONDAY MORNING
- DRY CONDITIONS, LIGHT WINDS, AND ABOVE-NORMAL TEMPERATURES
PREVAIL MIDDLE OF NEXT WEEK THROUGH FRIDAY
DISCUSSION
BREEZY CONDITIONS THIS AFTERNOON WHIT NORTHEAST WIND
TRAJECTORIES AND ALTHOUGH NO WIDESPREAD BLOWING DUST IS
EXPECTED, PATCHY BLOWING DUST WAS ADDED TO THE THE WEATHER GRIDS
FOR THE BALANCE OF THE AFTERNOON. OVERNIGHT TEMPERATURES
TEETERED AROUND THE FREEZING MARK IN T FEW OF THE VALLEYS,
CERTAINLY IN THE WALLOWA VALLEY AS WELL AS THE FOOTHILLS OF THE
BLUE MTS, AIDED THERE BY SOME CLEARING SKY OVERNIGHT. TONIGHT'S
CHALLENGES WILL BE OF A SIMILAR NATURE, WITH AT LEAST SOME
BETTER CONFIDENCE ON CLOUD COVER DIMINISHED ALTOGETHER IT HE THE
NORTHWEST ZONES (KITTITAS AND YAKIMA VALLEYS) AND A MORE LIKELY
BAND OF A MIX OF LOW AND MID LEVEL CLOUD LINGERING ON THE
MIDDLE OF THE UPPER LOW/ COLD POOL ALOFT, WHICH THE HREF SHOWS
IN A NORTH TO SOUTH AXIS WITH 50 TO 70 PERCENT COVERAGE FOR BOTH
CLOUD LEVELS. ADDITIONALLY THE NBM SPRINKLES 30 TO 50 PERCENT
CHANCES OF PRECIPITATION ACROSS THE HIGHER TERRAIN MOUNTAIN
ZONES OF EASTERN OREGON (RAIN OR RAIN/SNOW SHOWERS) WHICH BASED
ON HRR TREND COULD LINGER FROM ABOUT MIDNIGHT THOUGH NOON
MONDAY. SIMILAR TO YESTERDAY, THE NBM HAS MEANINGFULLY COLDER
TEMPERATURES ACROSS THE BOARD THAN THE HREF DATA ACROSS THE
AFOREMENTIONED ZONES AS WELL AS THE GRANDE RONDE VALLEY/AND
WALLOWAS. AS THE WALLOWA VALLEY SAW FREEZING TEMPS FOR AN HOUR
ONLY AT ENTERPRISE, AND TONIGHT LOOKS ABOUT AS CLOUDY OR MORE SO
WE WILL DEFER TO TUESDAY NIGHT WHERE COLDER TEMPS ARE
ANTICIPATED BY ALL OF THE PROBABILISTIC DATA (GREATER CHANCES IN
AREAL COVERAGE) FOR ANY FREEZE WARNINGS IN THE THE EASTERN
ZONES. FREEZE WARNINGS WILL BE HOISTED TONIGHT OF THE YAKIMA AND
ELLENSBURG AREAS. THE UPPER LOW LOOKS TO PULL INTO THE GREAT
BASIN OF NEVADA AND UTAH BY 12Z TUESDAY , LEAVING ALL OF
WASHINGTON AND OREGON IN A NORTHERLY FLOW ALOFT BEHIND THE
SYSTEM, AND THUS DRY, CLEAR WITH LIGHT WINDS. THIS WILL ALLOW
EFFICIENT LONG WAVE RADIATIONAL COOLING TO BRING THE COLDEST
TEMPS OF THE WEEK ACROSS A LARGER AREA. MUCH COLDER NBM LOWS
TEMPERATURES AND PROBABILITIES FOR REACHING BELOW FREEZING/32F
AT ABOUT 50-60 PERCENT AND UP IN MANY OF THE LOWER ELEVATIONS
POINTS TOWARD FREEZE WATCHES FOR MONDAY NIGHT AND TUESDAY
MORNING. CONFIDENCE LEANS HIGHER IN THESE INSTANCES AS THE
WIDESPREAD CLOUDINESS OF THE LAST COUPLE OF NIGHTS WILL NOT BE A
FACTOR.
AVIATION /00Z TAFS THROUGH 00Z TUESDAY/
VFR CONDITIONS CONTINUE TO PREVAIL THROUGH THE PERIOD WITH
3000-3500 FEET CEILINGS CONTINUE TO IMPACT RDM AND BDN. WE CAN
SEE BRIEF PERIODS THROUGH THE REST OF THE AFTERNOON (20-40%
CHANCE) THAT THEY WILL DROP BELOW VFR BUT EXPECTING CONDITIONS
TO DRY OUT HEADING INTO THE EARLY EVENING HOURS. WINDS WILL BE
BREEZY AT BDN, RDM, AND PSC WITH PERIODS OF 15 TO 25 KNOT GUSTS
THROUGH THE LATE AFTERNOON, DECREASING AS WE HEAD INTO THE EARLY
EVENING HOURS.
PRELIMINARY POINT TEMPS/POPS
PDT 32 57 30 63 / 10 20 0 0
ALW 36 57 36 64 / 20 20 0 0
PSC 35 62 31 66 / 0 0 0 0
YKM 34 63 34 65 / 0 0 0 0
HRI 34 60 30 66 / 0 10 0 0
ELN 29 59 30 63 / 0 0 0 0
RDM 22 55 22 64 / 0 0 0 0
LGD 30 54 26 62 / 30 10 0 0
GCD 28 54 25 64 / 20 10 0 0
DLS 37 68 36 71 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...FREEZE WATCH FROM MONDAY EVENING THROUGH TUESDAY MORNING FOR
WAZ026>029-521.
FREEZE WARNING FROM 11 PM THIS EVENING TO 9 AM PDT MONDAY FOR
WAZ026-027.
OR...FREEZE WATCH FROM MONDAY EVENING THROUGH TUESDAY MORNING FOR
ORZ044-049-050-507-508-510.
DISCUSSION...71
AVIATION...95
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