378
FXUS66 KPDT 081705
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1005 AM PDT WED APR 8 2026
KEY MESSAGES
- DRY AND SLIGHTLY WARMER THAN NORMAL THROUGH FRIDAY MORNING
- A SURGE IN CHANCES FOR PRECIPITATION INCLUDING THUNDERSTORMS AND
HIGH MOUNTAIN SNOW SHOWERS LATE FRIDAY THROUGH THE WEEKEND.
DISCUSSION
THROUGH FRIDAY A WARM AND MOSTLY SUNNY WEATHER REGIME IS
EXPECTED ESPECIALLY IN THE COLUMBIA BASIN AND MOST OF THE OTHER
VALLEYS AND BASINS. IMPACTS WILL BE HARD OR COME BY UNTIL THE
WEEKEND WHEN WINDS PICK UP AND PRECIPITATION RAIN /HIGH
ELEVATION SNOW AND THUNDERSTORMS RETURN. IN TERMS OF WIND
IMPACTS, VERY LITTLE IS EXPECTED OUTSIDE OF OPEN AREAS AND
TERRAIN DRIVEN GUSTS TO AROUND 20 MPH THOUGH THE END OF THE
WEEK. BREEZY TO MARGINALLY WINDY/GUSTY WEATHER CAN RETURN OVER
THE WEEKEND AS PRECIPITATION CHANCES RAMP UP. THIS WILL BE IN
RESPONSE TO A SURFACE LOW LOCATED AROUND 135W AND 38N THAT WILL
BE PUSHED ONSHORE BY THE END OF THE WEEK BY A LARGER NORTHEAST
PACIFIC HIGH, RESULTING IN MOISTURE AND WARM AIR ADVECTION INTO
NRN CA/SRN OR BY FRIDAY. THE SLOW PROGRESSION AND LOW MOISTURE
CONTENT RESULTS IN ONLY SUBTLE BUT STILL MODELED 20-24 MM
INLAND IVW (BOTH GFS/EC) FOR THE COLUMBIA BASIN FRIDAY NIGHT AND
SATURDAY MORNING. WITH THE RAMP UP IN PRECIPITATION CHANCES
THERE ARE LOW PROBABILITIES FOR THUNDERSTORMS AS WELL, STARTING
LATE FRIDAY AFTERNOON AND EVENING, ACROSS CENTRAL OREGON INTO
THE EASTERN SLOPES OF THE OREGON CASCADES (15-25% ON A 6 HOUR
BASIS). THE CHANCES WANE DIURNALLY, AND RETURN ON A MORE BROAD
AREAL BASIS, EXPANDING ACROSS THE EASTERN MOUNTAINS, MAINLY IN
OREGON, ON SATURDAY, (20-30% ON A 6 HOUR BASIS). ISOLATED GUSTY
THUNDERSTORM OUTFLOWS ARE A NON ZERO CHANCE RISK FOR ANY FIRE
CONCERNS THESE AFTERNOONS. SNOW LEVELS ARE ANTICIPATED TO BE
HIGH, WITH LIGHT AMOUNTS AND LIMITED IMPACTS, MOSTLY OCCURRING
SATURDAY NIGHT ABOVE THE 4500-5000 FT LEVELS.
AVIATION /18Z TAFS THROUGH 18Z THURSDAY/
VFR CONDITIONS WILL PERSIST THROUGH THE FORECAST PERIOD. HIGH
CIGS AND LIGHT VARIABLE WIND ARE EXPECTED TO PERSIST OVER THE
NEXT 24 HOURS. 90
PRELIMINARY POINT TEMPS/POPS
PDT 66 39 70 43 / 0 0 0 0
ALW 66 43 70 46 / 0 0 0 0
PSC 70 38 74 42 / 0 0 0 0
YKM 67 38 71 43 / 0 0 0 0
HRI 70 39 72 42 / 0 0 0 0
ELN 63 36 67 39 / 0 0 0 0
RDM 70 36 70 38 / 0 0 20 20
LGD 66 38 69 42 / 0 0 0 0
GCD 67 39 71 44 / 0 0 20 20
DLS 70 43 74 48 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...71
AVIATION...90
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