938
FXUS66 KPDT 041015
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
315 AM PDT SAT JUL 4 2026
KEY MESSAGES
- RED FLAG WARNING FOR CRITICAL FIRE WEATHER CONDITIONS IN THE
OREGON COLUMBIA BASIN TODAY, WITH LOCAL ENHANCED FIRE WEATHER
CONDITIONS ELSEWHERE.
- WARMING TEMPERATURES THROUGH TUESDAY, WITH ISOLATED
THUNDERSTORMS IN THE EASTERN MOUNTAINS SUNDAY THROUGH TUESDAY.
- ANOTHER ROUND OF ELEVATED FIRE WEATHER CONCERNS AROUND
MIDWEEK.
DISCUSSION
ZONAL FLOW WILL REMAIN OVER THE REGION TODAY BEFORE THE FLOW
BECOMES SOUTHWESTERLY LATER SUNDAY INTO MONDAY. THE FLOW WILL
THEN REMAIN SOUTHWESTERLY THOUGH TUESDAY BEFORE BECOMING MORE
WESTERLY AGAIN ON WEDNESDAY.
DRY AND DIURNALLY BREEZY CONDITIONS ARE EXPECTED TODAY. THE DRY
CONDITIONS COUPLED WITH AFTERNOON RH VALUES IN THE TEENS IN MANY
LOCATIONS HAS PROMPTED THE ISSUANCE OF A RED FLAG WARNING FOR
THE COLUMBIA BASIN OF OREGON. IN OTHER AREAS, WINDS ARE NOT
EXPECTED TO BE AS HIGH, BUT RH VALUES WILL STILL BE LOW, SO
ELEVATED FIRE WEATHER CONCERNS ARE STILL EXPECTED DESPITE NO
FIRE WEATHER HEADLINES.
AS THE FLOW BECOMES MORE SOUTHWESTERLY ON SUNDAY, A SERIES OF
SHORT WAVES WILL MOVE THROUGH THE FLOW EACH DAY. AS A RESULT
THERE WILL BE LOW (<20 PERCENT) CHANCES OF SHOWERS AND
THUNDERSTORMS, MAINLY OVER THE EASTERN OREGON MOUNTAINS, WITH
THE BEST (ALBEIT LOW) PROBABILITIES MONDAY AND TUESDAY.
MONDAY AND TUESDAY WILL ALSO SEE THE HOTTEST TEMPERATURES, WITH
MONDAY IN THE LOW TO MID 90S IN THE LOWER ELEVATIONS AND
TUESDAY IN THE MID TO UPPER 90S. THE COLUMBIA BASIN, COULD
CERTAINLY MAKE A RUN AT 100 DEGREES ON ONE OR BOTH OF THOSE
DAYS. HEATRISK IS WIDESPREAD MODERATE ACROSS THE LOWER
ELEVATIONS ON MONDAY AND TUESDAY.
BY WEDNESDAY, AN AREA OF LOW PRESSURE IS EXPECTED TO MOVE INTO
BRITISH COLUMBIA AND WILL BRING A WEAK FRONT THROUGH THE AREA.
STRONGER WESTERLY WINDS WILL INCREASE LATER TUESDAY AND CONTINUE
BEHIND THE FRONT WILL BRING ANOTHER PERIOD OF ENHANCED FIRE
WEATHER CONCERNS, ESPECIALLY FOR THE COLUMBIA BASIN, BUT ALSO
FOR THE KITTITAS CALLEY, SIMCOE HIGHLANDS AND POSSIBLY OTHER
AREAS AS WELL. RH VALUES WILL BE HIGHER ON WEDNESDAY IN SOME
AREAS, BEFORE DECREASING AGAIN ON THURSDAY.
AVIATION /12Z TAFS THROUGH 12Z SUNDAY/
VFR CONDITIONS ARE EXPECTED THROUGH THE TAF PERIOD.
WINDS WILL GUST THIS AFTERNOON AND EVENING TO 20 TO 25 KTS AT
ALL SITES EXCEPT PSC, BEFORE SUBSIDING TO AROUND 10 KTS OR LESS.
FIRE WEATHER
RED FLAG WARNING IS IN EFFECT FOR THIS AFTERNOON AND EVENING
FOR OR691 AS GUST DIURNAL WINDS AND LOW RH CREATE CRITICAL
CONDITIONS. FOR OTHER AREAS, WINDS AREN'T EXPECTED TO BE AS
STRONG BUT WILL STILL HAVE LOW RH SO THERE WILL STILL BE
ELEVATED CONCERNS. WINDS WILL DECREASE SUNDAY INTO MONDAY.
ELEVATED FIRE WEATHER CONCERNS OCCUR AGAIN LATER TUESDAY THROUGH
MIDWEEK AS WESTERLY WINDS INCREASE. WILL HAVE TO SEE HOW THE RH
PROFILE COMBINES WITH THESE INCREASING WINDS.
THERE IS ALSO A LOW (<20 PERCENT) CHANCE OF THUNDERSTORMS
SUNDAY THROUGH TUESDAY, MAINLY OVER THE EASTERN OREGON
MOUNTAINS.
PRELIMINARY POINT TEMPS/POPS
PDT 89 53 87 56 / 0 0 0 0
ALW 90 58 88 60 / 0 0 0 0
PSC 93 56 91 56 / 0 0 0 0
YKM 92 55 91 58 / 0 0 0 0
HRI 92 56 90 57 / 0 0 0 0
ELN 83 51 87 54 / 0 0 0 0
RDM 88 49 89 54 / 0 0 0 0
LGD 89 53 88 55 / 0 0 0 0
GCD 92 52 93 56 / 0 0 0 10
DLS 87 57 92 60 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...OR...RED FLAG WARNING FROM NOON TODAY TO 10 PM PDT THIS EVENING FOR
ORZ691.
DISCUSSION...77
AVIATION...77
FIRE WEATHER...82
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page