461
FXUS66 KPDT 202314
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
414 PM PDT SAT JUN 20 2026
KEY MESSAGES
1. FIRE WEATHER CONCERNS TODAY FOR WINDS AND RHS
*RED FLAG WARNINGS ISSUED*
2. DRY AND WARM CONDITIONS WILL PERSIST THROUGH THURSDAY
*HEAT ADVISORY ISSUED*
3. PATTERN SHIFT THURSDAY WILL BRING COOLER TEMPERATURES AND
MOUNTAIN RAIN
DISCUSSION
CURRENT SATELLITE SHOWS SOME CLOUD COVERAGE OVER THE REGION THIS
AFTERNOON. THESE WILL BEGIN TO TAPPER OFF THROUGH THE DAY LEAVING
THE REGION MOSTLY UNDER CLEAR SKIES. TEMPERATURES TODAY WILL BE IN
THE MID 80S TO LOW 90S IN THE COLUMBIA BASIN AND NORTHER BLUE
FOOTHILLS WITH 80-90% CONFIDENCE WHILE THE REMAINDER OF THE REGION
WILL BE IN THE LOW TO MID 80S WITH 70S IN SOME OF THE HIGHER
LOCATIONS SUCH AS CLE ELUM, TOLLGATE AND MEACHAM. OVERNIGHT LOWS
WILL BE A BIT ON THE WARMER SIDE WITH THE VAST MAJORITY OF THE AREA
SEEING LOW IN THE UPPER 40S TO LOW 50S. WINDS TODAY WILL ALSO BE
BREEZY AS MODELS SHOW AN UPPER LEVEL SHORTWAVE MAKING ITS WAY ACROSS
THE REGION. WEST WINDS OF 10-15 MPH WITH GUSTS TO 30 MPH (70-90%
PROBABILITIES) WILL OCCUR ACROSS THE FOOTHILLS OF THE NORTHERN AND
SOUTHERN BLUES, THROUGH THE GORGE AS WELL AS THE BASIN. WINDS IN THE
KITTITAS VALLEY AND YAKIMA VALLEY WILL BE 20-30 MPH SUSTAINED WITH
GUSTS TO NEAR 45 MPH. DUE TO THE WINDY CONDITIONS IN THAT AREA, A
WIND ADVISORY HAS BEEN ISSUED FOR 3 PM TODAY THROUGH MIDNIGHT.
MODELS SHOW THE UPPER LEVEL RIDGE TO REMAIN IN PLACE THROUGH
THURSDAY. WITH IT REMAINING IN PLACE, MODELS AND ENSEMBLES SHOW
TEMPERATURES TO STEADILY INCREASE THROUGH THE WEEK. THE HOTTEST DAYS
WILL BE MONDAY THROUGH WEDNESDAY WITH HEATRISK BECOMING A 2 OF 4
EACH DAY. THERE IS AN ISOLATED POCKET OF MAJOR HEATRISK (3 OF 4)
THROUGH THE WA & OR COLUMBIA RIVER GORGE FOR MONDAY AND TUESDAY WITH
ENSEMBLES SHOWING THERE TO BE A 70-90% PROBABILITY OF 97 DEGREES OR
HIGHER SO A HEAT ADVISORY HAS BEEN ISSUED FOR THAT LOCATION. AS FOR
THE BASIN, YAKIMA/KITTITAS VALLEY/CENTRAL OR AND THE FOOTHILLS OF
THE NORTHERN AND SOUTHERN BLUES, THOSE AREAS WILL BE IN THE MODERATE
HEATRISK (2 OF 4) WHILE THE HIGHER ELEVATIONS WILL REMAIN IN THE
MINOR (1 OF 4) CATEGORY. OVERNIGHT LOWS MONDAY INTO TUESDAY WILL BE
IN THE LOW TO MID 50S ACROSS THE MODERATE HEATRISK REGIONS WITH
OVERNIGHT LOWS THROUGH THE GORGE BEING IN THE MID 60S (70-80%
CONFIDENCE). NOT MUCH REPRIEVE THROUGH THE OVERNIGHT HOURS.
LASTLY, BY WEDNESDAY NIGHT INTO THURSDAY MORNING, MODELS SHOW AN
UPPER LEVEL SYSTEM MOVING INTO THE REGION FROM THE NORTHWEST.
CLUSTERS SHOW SOME VARIANCE BETWEEN THE MODELS WITH MOSTLY AMPLITUDE
AND TIMING. REGARDLESS, MODELS SHOW THE SYSTEM TO BRING WITH IT
MOUNTAIN RAIN AND COOLER TEMPERATURES. RAIN AMOUNTS WILL BE LOW WITH
ONLY 20-25% OF THE NBM RAW ENSEMBLES SHOWING 0.01 INCHES OF RAIN
THURSDAY BEFORE BECOMING WIDESPREAD AND ONLY 10-15% OF THE RAW
ENSEMBLES SHOWING 0.01 INCHES ACROSS THE REGION FRIDAY. THURSDAY NBM
RAW ENSEMBLES SHOW 80-90% PROBABILITIES OF TEMPERATURES ABOVE 80
DEGREES DECREASING TO 60-80% PROBABILITIES OF TEMPERATURES ABOVE 70
DEGREES FRIDAY.
AVIATION /18Z TAFS THROUGH 18Z SUNDAY/
VFR CONDITIONS WILL PERSIST THROUGH THE FORECAST PERIOD.
WINDS WILL BE BREEZY ACROSS ALL TAF SITES THROUGH THE PERIOD BEFORE
WINDS DECREASE BELOW 10 KTS AFTER 07Z. OTHERWISE, WINDS WILL BE 12-
20 SUSTAINED WITH GUSTS AS HIGH AS 22-30 KTS POSSIBLE. CONFIDENCE IN
THE WINDS IS MODERATE TO HIGH BETWEEN 60-80% PROBABILITIES. CIGS
WILL REMAIN SCT/FEW250 THROUGH THE LATE MORNING BEFORE BREAKING AWAY
TO SKC.
AVIATION /00Z TAFS THROUGH 00Z MONDAY/
VFR FLIGHT CATEGORY IS EXPECTED AT ALL TERMINALS AS A DRY
BOUNDARY PLAYER PRECLUDES THE DEVELOPMENT OF ANY OBSCURATIONS
OR CEILINGS. BREEZY TO WINDY WEST TO NW WINDS WILL WEAKEN AFTER
5 Z BECOMING LESS THAN 12 KNOTS OUT OF THE WEST OR NORTHWEST
FOR THE BALANCE OF THE OVERNIGHT AND MUCH OF THE DAY ON SUNDAY.
FIRE WEATHER
RED FLAG WARNINGS ISSUED FOR YAKIMA VALLEY (WA690),
COLUMBIA BASIN OF OR & WA AND EASTERN COLUMBIA RIVER GORGE OF WA
(OR691/WA691) AND THE MOUNTAINS OF CENTRAL OR (OR700). RFW IS FOR
WEST WINDS 10-25 MPH WITH GUSTS TO 35 MPH WITH MINIMUM RELATIVE
HUMIDITY'S AS LOW AS 8%. THIS PUTS THESE AREAS IN CRITICAL FIRE
WEATHER AND ANY IGNITION WILL HAVE THE ABILITY TO GROW RAPIDLY.
PRELIMINARY POINT TEMPS/POPS
PDT 50 84 52 88 / 0 0 0 0
ALW 56 85 58 89 / 0 0 0 0
PSC 54 89 57 92 / 0 0 0 0
YKM 54 88 57 91 / 0 0 0 0
HRI 54 87 55 91 / 0 0 0 0
ELN 51 84 54 87 / 0 0 0 0
RDM 41 83 46 89 / 0 0 0 0
LGD 46 81 48 86 / 0 0 0 0
GCD 44 84 45 89 / 0 0 0 0
DLS 55 88 60 94 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...RED FLAG WARNING UNTIL 8 PM PDT THIS EVENING FOR WAZ690-691.
HEAT ADVISORY FROM 11 AM MONDAY TO 11 PM PDT TUESDAY FOR
WAZ024.
WIND ADVISORY UNTIL MIDNIGHT PDT TONIGHT FOR WAZ026.
OR...RED FLAG WARNING UNTIL 8 PM PDT THIS EVENING FOR ORZ691-700.
HEAT ADVISORY FROM 11 AM MONDAY TO 11 PM PDT TUESDAY FOR
ORZ041.
DISCUSSION...90
AVIATION...71
FIRE WEATHER...90
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