321
FXUS66 KPDT 071702
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
902 AM PST SAT MAR 7 2026
DISCUSSION
A PROGRESSIVE PATTERN WILL CONTINUE THIS WEEKEND AND THROUGH
NEXT WEEK. WINDY CONDITIONS ARE ANTICIPATED ON SUNDAY AFTERNOON
AS THE FORECAST AREA UNDERGOES MID LEVEL HEIGHT FALLS AND
BOUNDARY LAYER WARM ADVECTION. MID LEVEL VORTICITY A ZONAL
ATMOSPHERIC RIVER BECOMES MORE PRONOUNCED MONDAY, WHEN MOUNTAIN
SNOWS BECOME MORE IMPACTFUL NEAR THE PASS LEVELS IN THE WA
CASCADES. DAYTIME SURFACE ROAD TEMPS MIGHT STILL BE CHALLENGED
BY SNOW RATES ON MONDAY WITH SLICK ROADS AT PASS LEVELS AS 6
INCHES IS POSSIBLE AT PASS LEVELS (70-80% CONFIDENCE). THIS
INITIAL AR IS FOLLOWED UP AND ANOTHER WAVE OF MOISTURE ON
INCREASING MID LEVEL HEIGHT AND STRONGER JET LEVEL WINDS
WEDNESDAY AND THURSDAY. THURSDAY COULD ALSO BE A PARTICULARLY
WINDY DAY FOR THE FORECAST AREA AS THE NAEFS SHOWS AN SA OF
AROUND 3 ACROSS THE COLUMBIA BASIN AT THE 850 MB LEVEL. THE
NAEFS ALSO SHOWS THE MOISTURE TRANSPORT /IVT TRANSITIONING FROM
A MORE ROBUST EPISODE OVER THE WEEKEND, WITH A MERIDIONAL
ASPECT, RETURNING BY WEDNESDAY , WEAKER IN TERMS OF STANDARDIZED
ANOMALIES BUT MORE ZONAL, IMPINGING ON THE MOUNTAINS WITH LOWER
SNOW LEVELS. MEAN SLRS FALL FROM DECENT 15:1 AT THE PASS LEVELS
ON TUESDAY INTO THE 9 TO 10:1 RANGE BY WEDNESDAY INTO EARLY
THURSDAY. NBM RAMPS UP SNOW WEDNESDAY WITH MEAN TOTALS OF 2 TO 4
FEET OF SNOW ACROSS THE EASTERN SLOPES OF THE WA CASCADES
THROUGH FRIDAY (50% CONFIDENCE FOR PASS LEVELS AND 60-80%
CONFIDENCE IN THE HIGHER ELEVATIONS). SIMILARLY ONE TO TWO FEET
OF SNOW IS POSSIBLE ACROSS THE OREGON CASCADE EASTERN SLOPES,
AND UP TO A FOOT OF SNOW FOR THE NORTHERN BLUES AND WALLOWAS.
THE 6-10 DAY LEANS ON NORMAL TEMPERATURES AND WETTER THAN NORMAL
PRECIPITATION BEFORE TRENDING TO WARMER , AND SLIGHTLY LEANING
WETTER FOR THE 8-14 (WEEK 2) PERIOD, ENDING INTO THE 3RD WEEK
OF MARCH.
AVIATION /18Z TAFS THROUGH 18Z SUNDAY/
VFR CONDITIONS WILL PREVAIL THROUGH THE FORECASTED PERIOD. CIGS
WILL BE 10-25KFT THROUGH THE DAY WITH SOME TAF SITES CLEARING TO
SKC. A SHORTWAVE DISTURBANCE WILL BRING ELEVATED WINDS ACROSS
TAF SITES DLS/ALW/PDT/PSC RANGING FROM 10-17KTS WITH GUSTS
NEARING 30 KTS THROUGH THE PERIOD. 90
PRELIMINARY POINT TEMPS/POPS
PDT 64 43 63 34 / 20 0 10 30
ALW 64 47 62 35 / 20 0 20 50
PSC 69 46 66 34 / 10 0 0 10
YKM 66 40 62 30 / 10 0 20 0
HRI 67 45 65 35 / 10 0 0 10
ELN 58 41 55 30 / 10 10 40 20
RDM 62 32 60 30 / 10 0 0 0
LGD 61 39 60 32 / 30 0 10 50
GCD 58 35 60 36 / 20 0 0 20
DLS 63 46 60 37 / 20 10 40 30
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...71
AVIATION...90
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