567
FXUS66 KPDT 061713
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1013 AM PDT SAT JUN 6 2026
KEY MESSAGES
- SHOWERS AND ISOLATED THUNDERSTORMS ALONG THE CASCADE CREST
TODAY.
- BREEZY WINDS IN THE LOWER ELEVATIONS THROUGH SUNDAY.
- ANOTHER SYSTEM WILL BRING ADDITIONAL SHOWER AND THUNDERSTORM
CHANCES MONDAY THROUGH WEDNESDAY.
DISCUSSION
544 DM UPPER LOW PRESSURE CENTERED NEAR 48.6N AND 128W IS
FORECAST TO BE CENTERED NEAR THE WA/BC BORDER 24 HOURS FOR NOW.
WHAT THIS MEANS FOR SENSIBLE WEATHER IS MORE CLOUDS AND COOLER
TEMPERATURES THIS AFTERNOON AS WELL AS MOUNTAIN SHOWERS FOR THE
CASCADES AND EVEN SOME RISK FOR ISOLATED THUNDERSTORMS.
ADDITIONALLY BREEZY TO WINDY SURFACE WESTERLIES ACROSS THE
COLUMBIA BASIN/BLUE MT FOOTHILLS AND COLUMBIA RIVER GORGE, WILL
BE LARGELY DIURNALLY DRIVEN, WEAKENING IN THE EVENING. THIS
UPPER LOW BECOMES STRETCHED/AMPLIFIED AND LIFTS NORTHEAST INTO
CANADA OVERNIGHT INTO SUNDAY MORNING WITH A SHORTWAVE RIDGE,
SUBSIDENCE AND DRY CONDITIONS SETTING UP FOR SUNDAY AFTERNOON. A
DRY SUNDAY WILL BE FOLLOWED BY ANOTHER UPPER LOW TO INFLUENCE
SENSIBLE WEATHER AGAIN MONDAY AND TUESDAY WITH RAIN AND
THUNDERSTORMS, AND EVEN WETTING RAINS ACROSS THE MOUNTAIN
ZONES, (EASTERN MOUNTAINS INCLUDED THIS TIME) AS THE TRACK OF
THE UPPER LOW APPEARS MUCH FARTHER SOUTH. THURSDAY AND FRIDAY
WILL BRING A REBOUND TO MORE SUMMER LIKE TEMPERATURES IN THE 80S
ACROSS THE LOWER ELEVATIONS.
AVIATION /18Z TAFS THROUGH 18Z SUNDAY/
VFR CONDITIONS PREVAIL THROUGH THE PERIOD. BREEZY WINDS AT TIMES
AT THE TAF SITES, WITH PROB30 CHANCES OF A SLIGHT SHOWER AT THE
DLS SITE LATER TODAY. NOT EXPECTING ANY SIGNIFICANT CIG OR VIS
ISSUES.
FIRE WEATHER
RIGHT NOW, ONLY THE WA FIRE WX ZONE (691) OF THE COLUMBIA BASIN
HAS FUELS READY FOR RED FLAG CONSIDERATION. FOR SATURDAY
AFTERNOON, THE COMBINED PROBABILITIES FOR SUB 30% RH AND 15 MPH
OR HIGHER ARE IN THE 20% TO LOCALLY 55-60% RANGE, A BIT SHORT OF
RED FLAG ISSUANCE CONFIDENCE. SUNDAY IS SIMILAR IN NATURE IN
TERMS FIRE RISK, WITH COMBINED PROBABILITIES FOR CRITICAL FORE
WEATHER RUNNING 10-40% ACROSS THE EASTERN SECTIONS OF WA691 AND
NEAR THE COLUMBIA RIVER. PROBABILITY OF LIGHTING IS BETWEEN 10
AND 30 % ON CASCADE RIDGETOP FROM AROUND NOON THROUGH 7 PM.
PRELIMINARY POINT TEMPS/POPS
PDT 66 40 70 46 / 0 0 0 20
ALW 67 45 70 50 / 0 0 0 0
PSC 71 42 75 48 / 10 0 0 10
YKM 68 40 74 48 / 20 10 0 10
HRI 69 41 73 47 / 0 0 0 20
ELN 60 36 66 42 / 40 10 0 20
RDM 62 28 69 42 / 0 0 0 20
LGD 63 38 67 42 / 0 10 0 0
GCD 65 36 68 41 / 0 10 0 0
DLS 66 43 72 51 / 40 30 0 20
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...71
AVIATION...95
FIRE WEATHER...71
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