440
FXUS66 KPDT 072143
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
243 PM PDT TUE OCT 7 2025
DISCUSSION
EFFECTIVE RADIATIVE COOLING WITH CLEAR, CALM
CONDITIONS CONTINUES OVERNIGHT AS THE UPPER-LEVEL RIDGE OF HIGH
PRESSURE CONTINUES TO TAKE PLACE OVER THE PACIFIC NORTHWEST. WE'LL
SEE ANOTHER ROUND ISOLATED/PATCHY AREAS OF FROST ACROSS THE
COLDEST PARTS OF CENTRAL OR AND OTHER PARTS OF THE SOUTHERN
BLUES. LOWS TONIGHT WILL BE A TAD WARMER THAN LAST NIGHT, SO NOT
EXPECTING AS MUCH FREEZING TONIGHT. AREAS ACROSS THE HIGHER
TERRAINS AND THE DEEP SHELTERED VALLEY AREAS WILL SEE LOWS DIP
JUST BELOW/AT FREEZING (30-50% CONFIDENCE).
OUR NEXT WEATHER SYSTEM WILL ORIGINATE FROM THE GULF OF ALASKA,
AS A TROUGH DIGS SOUTH THROUGH THE MID-WEEK, GRADUALLY
TRANSITIONING INTO A LOW PRESSURE SYSTEM THROUGH THURSDAY. AFTER
THE INITIAL LOW PROGRESSES PASS THE AREA, A SECOND SHORTWAVE IS
EXPECTED TO DEVELOP RIGHT BEHIND THE LOW, TO EXTEND RAIN/MOUNTAIN
SNOW CHANCES THROUGH SUNDAY/EARLY MONDAY. PRECIP CHANCES WILL BE
HIGHEST FRIDAY GOING INTO SUNDAY, WITH CHANCES HIGHER IN
ELEVATED/MOUNTAIN REGIONS (70-90% CHANCE) THAN IN THE BASIN
(30-50% CHANCE). SNOW LEVELS WILL DROP TO 4500-5000 FEET SATURDAY-
SUNDAY, ALLOWING CHANCES FOR MEASURABLE SNOW TO ACCUMULATE IN THE
MOUNTAINS (50-80% CHANCE). AS THE NEXT SHORTWAVE MAKES ITS WAY
INTO THE REGION SUNDAY, MODELS SUGGEST WINDS WILL GET STRONGER,
ESPECIALLY ACROSS THE COLUMBIA BASIN/GORGE AND THE CASCADE GAPS.
NBM SUGGESTS 40-60% CHANCES OF WIND GUSTS 45 MPH OR GREATER GOING
THROUGH SUNDAY.
AVIATION...18Z TAFS
VFR CONDITIONS CONTINUE TO PREVAIL AT ALL
SITES WHILE THE CALM WEATHER PATTERN CONTINUES. WINDS WILL BE
GENERALLY LIGHT AND VARIABLE IN NATURE. NO VIS OR CIG ISSUES
EXPECTED WITH SKC DOMINATING THE PERIOD.
PRELIMINARY POINT TEMPS/POPS
PDT 44 72 42 68 / 0 0 10 10
ALW 49 74 47 70 / 0 0 10 10
PSC 40 74 42 70 / 0 0 10 20
YKM 42 71 44 67 / 0 0 30 40
HRI 41 72 42 70 / 0 0 10 20
ELN 38 67 40 66 / 0 0 40 30
RDM 35 72 35 62 / 0 0 30 30
LGD 42 74 43 75 / 0 0 10 10
GCD 40 76 44 75 / 0 0 10 10
DLS 46 67 47 66 / 0 0 40 40
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
DISCUSSION....95
AVIATION...95
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