551
FXUS66 KPDT 221148
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
448 AM PDT MON JUN 22 2026
KEY MESSAGES
- MODERATE HEATRISK CONDITIONS DEVELOP TODAY THROUGH WEDNESDAY
AS RIDGE MOVES OVER THE AREA.
- DRY AIR WITH BREEZY CONDITIONS DEVELOPING WILL BRING ELEVATED
FIRE WEATHER CONDITIONS THROUGH THURSDAY.
- WETTER PATTERN EXPECTED BY THE WEEKEND WITH ONCOMING TROUGH,
BRINGING WIDESPREAD SHOWERS ACROSS THE REGION WITH ISOLATED
THUNDERSTORMS ALONG THE EASTERN MOUNTAINS AND SOUTHERN PARTS
OF THE BLUES.
DISCUSSION
SATELLITE AND RADAR CONTINUE TO SHOW THE EXPECTED DRY AND CLEAR
CONDITIONS ACROSS THE AREA, AS AN ONCOMING RIDGE APPROACHES THE
REGION. DETERMINISTIC MODELS IN THE SHORT-TERM ARE AGREEABLE
THAT THE RIDGE AXIS WILL MAKE ITS WAY OVER THE REGION TUESDAY &
WEDNESDAY. IN RESPONSE, A WARMING TREND WILL CONTINUE TODAY
THROUGH MID-WEEK (>90% CHANCE) WITH TEMPERATURES PEAKING IN THE
LOW TO UPPER 90S THROUGHOUT THE LOWER ELEVATION/POPULATED
AREAS. WIDESPREAD MODERATE HEAT RISK WILL DEVELOP (VALUE OF
'2'), BRINGING HEAT THREATS TO THE MOST VULNERABLE TO HEAT
EVENTS. NBM ADVERTISES VIRTUALLY NO CHANCES OF TRIPLE DIGITS
OCCURRING, COMING OFF OF 0-20% CHANCES FROM A FEW DAYS AGO.
REGARDLESS, VERY WARM AND HOT TEMPERATURES WILL DEVELOP AND
PREPARATION MAY BE NEEDED TO STAY COOL.
DRY AIR WITH MINIMUM RELATIVE HUMIDITIES IN THE 10-21% RANGE
WILL PREVAIL THROUGH AT LEAST THURSDAY (70-90% CHANCE) WITH
BREEZY TO LOCALLY WINDY CONDITIONS DEVELOPING FROM AN ONCOMING
SHORTWAVE ARRIVING IN THE MIDWEEK (60-80% CHANCE). BREEZY TO
LOCALLY WINDY GUSTS OF 25-35 MPH ARE EXPECTED TO DEVELOP
THURSDAY (50-70% CHANCE) SITUATED IN THE COLUMBIA BASIN & THE
KITTITAS VALLEY. IN CONJUNCTION WITH THE DRY AIR STILL
LINGERING, ELEVATED/CRITICAL FIRE WEATHER CONDITIONS COULD
DEVELOP ACROSS THE COLUMBIA BASIN & KITTITAS/YAKIMA REGION
THURSDAY, AND TO A LESSER AND MORE ISOLATED EXTENT, ON
WEDNESDAY. BY FRIDAY, IMPROVING OVERNIGHT RECOVERIES AND
MINIMUM RELATIVE HUMIDITIES. THIS WILL BRING SOME RELIEF FROM
THE DRY AIR AND WARMER TEMPERATURES AND BRING SOME RAIN SHOWERS
ACROSS THE REGION. CURRENT ENSEMBLE GUIDANCE IS A BIT
DISAGREEABLE WITH THE EXACT TIMING/AMPLITUDE OF THE SYSTEM, BUT
THEY ALL POINT TO A TROUGH/COLD FRONT OCCURRING BY THE FRIDAY-
SATURDAY TIMEFRAME.
AVIATION /12Z TAFS THROUGH 12Z TUESDAY/
VFR CONDITIONS CONTINUE WITH SKC TO SCT CONDITIONS THROUGH THE
FORECAST PERIOD. WINDS REMAIN UNDER 12 KNOTS WITH NO CIG OR VIS
ISSUES EXPECTED.
PRELIMINARY POINT TEMPS/POPS
PDT 88 53 90 55 / 0 0 0 0
ALW 89 58 92 60 / 0 0 0 0
PSC 92 56 94 58 / 0 0 0 0
YKM 90 60 92 61 / 0 0 0 0
HRI 91 56 93 58 / 0 0 0 0
ELN 87 57 89 59 / 0 0 0 0
RDM 88 51 89 52 / 0 0 0 0
LGD 85 50 89 52 / 0 0 0 10
GCD 89 49 93 51 / 0 0 0 0
DLS 93 63 95 65 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...HEAT ADVISORY FROM 11 AM THIS MORNING TO 11 PM PDT TUESDAY FOR
WAZ024.
OR...HEAT ADVISORY FROM 11 AM THIS MORNING TO 11 PM PDT TUESDAY FOR
ORZ041.
DISCUSSION...95
AVIATION...95
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