748
FXUS66 KPDT 131130
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
430 AM PDT TUE OCT 13 2026
KEY MESSAGES
- WARMING AND DRYING TREND THROUGHOUT THE WEEK
- PATTERN CHANGE THIS WEEKEND BRINGING POTENTIAL FOR LIGHT
PRECIPITATION
DISCUSSION
A CUTOFF LOW OVER NEVADA SHOWN ON THE MIDLEVEL WATER VAPOR IS
EXPECTED TO DIG SOUTH AND TRANSLATE EAST. WRAPPED AROUND THIS LOW
REMAINS A POCKET OF DRY SINKING AIR WHICH IS WHAT IS PREVENTING
CLOUDS OVER THE REGION. OVER THE PACIFIC, A HIGH PRESSURE SYSTEM IS
BUILDING FORCING THE AMPLIFICATION OF THE THE RIDGE UPSTREAM FROM
THE CWA.
THIS WEEK THE REGION IS EXPECTED TO WARM UP LOWERING THE CHANCES FOR
SUBFREEZING TEMPERATURES. WEDNESDAY, THE SUBFREEZING PROBABILITIES
ARE LIMITED TO THE HIGHER ELEVATIONS ALONG THE BLUE MOUNTAINS INTO
THE JOHN DAY HIGHLANDS. THE WEDNESDAY SUBFREEZING TEMPERATURES
PROBABILITIES RANGE FROM 30% TO 75%. THURSDAY OVERNIGHT LOWS THOUGH
THE REGION REMAIN ABOVE FREEZING, BUT SOME ISOLATED CASES IN THE LOW
VALLEYS SUCH AS SENECA AND THE FOOTHILLS OF THE BLUE MOUNTAINS COULD
SEE SUB-FREEZING TEMPERATURES STILL. MOVING TOWARD THE WEEKEND, THE
WARMING TREND CONTINUES UNDER THE RIDGE, BRINGING THE REGION ABOVE
CLIMATOLOGICAL NORMALS BY 6-15 DEGREES. THE AREA SHOULD REMAIN DRY
UNTIL NEXT WEEK. BOX AND WHISKERS HAVE A A WIDER ENVELOPE WITH THE
25TH AND 75TH HAVING A WIDER VARIANCE IN THE TEMPERATURES.
NEXT WEEK CLUSTERS ARE SUGGESTING A TIMING AND AMPLITUDE DIFFERENCES
IN ALL THE CLUSTERS. CLUSTERS 3 AND 4 HAVE THE RIDGE BEING STRONGER
IN AMPLITUDE AND LINGERING OVER THE REGION WHILE SHOWING LOWER QPF
VALUES. CLUSTERS 2 AND 3 ARE A DIPOLE PATTERN SUGGESTING A TIMING
ISSUE WITH THE TROUGH MOVING THROUGH. CLUSTER 1 SUGGESTS THE TROUGH
WILL LIKELY BE STRONGER COINCIDING WITH HIGHER QPF VALUES.
AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/
VFR CONDIONS TO PREVAIL THROUGH THE TAF PERIOD.
WINDS ARE LIGHT WITH A DIURNAL WIND PATTERN.
PRELIMINARY POINT TEMPS/POPS
PDT 64 36 68 37 / 0 0 0 0
ALW 65 41 69 41 / 0 0 0 0
PSC 67 34 71 36 / 0 0 0 0
YKM 65 39 70 41 / 0 0 0 0
HRI 66 36 70 38 / 0 0 0 0
ELN 62 35 67 37 / 0 0 0 0
RDM 66 27 69 30 / 0 0 0 0
LGD 63 31 68 34 / 0 0 0 0
GCD 64 33 70 37 / 0 0 0 0
DLS 70 41 74 45 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...FREEZE WARNING UNTIL 9 AM PDT THIS MORNING FOR WAZ026>029-521.
OR...FREEZE WARNING UNTIL 9 AM PDT THIS MORNING FOR ORZ044-049-050-
507-508-510.
DISCUSSION...18/90
AVIATION...18/90
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page