374
FXUS66 KPDT 072315
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
415 PM PDT TUE JUL 7 2026
KEY MESSAGES
- HOT, DRY, AND BREEZY CONDITIONS PERSIST, ALLOWING ELEVATED
FIRE WEATHER CONCERNS TO CONTINUE IN THE COLUMBIA BASIN AND
KITTITAS VALLEY.
- TEMPERATURES PEAK TODAY, WITH AREAS ACROSS THE BASIN REACHING
TRIPLE DIGITS.
- CHANCES OF ISOLATED THUNDERSTORMS (10-25%) ACROSS CENTRAL
OREGON AND THE EASTERN MOUNTAINS.
DISCUSSION
RADAR SHOWS DRY CONDITIONS, WITH SATELLITE SHOWING CUMULUS
CLOUDS DEVELOPING ACROSS CENTRAL OREGON AND THE BLUE MOUNTAINS.
WORTH NOTING NBM ADVERTISES 10-25% CHANCES OF THUNDERSTORMS
DEVELOPING ACROSS THERE, WITH HRW NSSL AND HRW FV3 ADVERTISING
ISOLATED CELLS DEVELOPING LATER THIS AFTERNOON. PRECIPITABLE
WATER FIGURES ARE LESS THAN 1.25 INCHES, SUGGESTING THESE WILL
BE DRY IN NATURE. NOT EXPECTING THESE STORMS TO PRODUCE AN
ABUNDANT LIGHTNING OR BE SEVERE, WITH GUSTY WINDS AND PEA SIZE
HAIL BEING THE BIGGEST EXPECTED IMPACTS. FOR THE REST OF THE
DAY, LOW RELATIVE HUMIDITIES PREVAIL THROUGH MUCH OF THE REGION
WITH PARTS OF THE COLUMBIA BASIN REACHING THE UPPER 90S TO LOW
TRIPLE DIGITS. RED FLAG WARNINGS PREVAIL THROUGH THE BASIN AND
YAKIMA/KITTITAS VALLEY REGION THROUGH 10 PM AS CRITICAL FIRE
WEATHER CONDITIONS CONTINUE.
TEMPERATURES WILL COOL OFF TOMORROW AND THROUGH THE WEEK WITH AN
ONCOMING SHORTWAVE ALLOWING HIGH TEMPERATURES TO DROP IN THE
UPPER 80S TO LOW 90S THROUGH MUCH OF THE LOWER ELEVATED REGIONS
(70-90% CHANCE). BREEZY WINDS WILL CONTINUE WITH TIGHT PRESSURE
GRADIENT FORMATION VIA SHORTWAVES AND ON-COMING LOW PRESSURE
SYSTEMS WITH SUSTAINED WINDS OF 10 TO 25 MPH FROM THE WEST AND
NORTHWEST. OTHERWISE, NOT ANTICIPATING PRECIPITATION WITH THE
LACK OF MOISTURE AND LOW PRECIPITABLE WATER VALUES. TEMPERATURES
REMAIN STEADY IN THE UPPER 80S TO LOW 90S THROUGH THE REST OF
THE WEEK (70-90% CHANCE).
AVIATION /00Z TAFS THROUGH 00Z THURSDAY/
BASED ON HRRR MODEL FIELDS SURFACE WINDS WILL INCREASE OVER THE
EVENING, MAINTAINING GUSTS AS HIGH AS 30 MPH AT DLS AND
INCREASING WITH TIME AT PDT/YKM THROUGH MIDNIGHT. CEILINGS AND
VISIBILITY ARE NOT RESTRICTIVE ALTHOUGH A BRIEF WINDOW OF HZ IN
THE 4 TO 6 MILE RANGE IS POSSIBLE AT PDT AROUND 12-15Z DUE TO
SMOKE FROM A NEARBY FIRE.
FIRE WEATHER
RED FLAG WARNINGS ARE ISSUED FOR WA690, WA691, AND OR691 FROM
NOW UNTIL 10 PM TODAY (TUESDAY) DUE TO BREEZY CONDITIONS AND LOW
RELATIVE HUMIDITIES. DRY AIR WITH BREEZY WINDS WILL PERSIST
THROUGH THE COLUMBIA BASIN AND KITTITAS VALLEY THROUGH AT LEAST
FRIDAY/SATURDAY (70-90% CHANCE) ALLOWING ELEVATED FIRE WEATHER
CONCERNS TO PREVAIL. ISOLATED AREAS ACROSS WA690, WA691, AND
OR691 COULD REACH RED FLAG CRITERIA THROUGH THE WEEK.
ADDITIONALLY, SLIGHT CHANCES OF ISOLATED THUNDERSTORMS (10-25%)
ACROSS CENTRAL OREGON AND THE EASTERN MOUNTAINS COULD DEVELOP
LATER THIS AFTERNOON. GUIDANCE ADVERTISES LOW PRECIPITABLE WATER
VALUES LESS THAN 1.25 INCHES, ALLOWING THE ASSUMPTION THAT MOST
OF THE STORMS WILL BE DRY WITH NO WETTING RAINS EXPECTED. WORTH
NOTING THAT WE'RE NOT EXPECTING THESE STORMS TO PRODUCE
ABUNDANT LIGHTNING AND THAT THEY STAY ISOLATED IN NATURE.
PRELIMINARY POINT TEMPS/POPS
PDT 59 88 55 87 / 0 0 0 0
ALW 65 89 59 88 / 0 0 0 0
PSC 64 93 57 91 / 0 0 0 0
YKM 60 91 57 91 / 0 0 0 0
HRI 63 91 58 90 / 0 0 0 0
ELN 57 82 54 83 / 0 0 0 0
RDM 52 86 48 86 / 0 0 0 0
LGD 59 87 53 87 / 0 0 0 0
GCD 55 89 51 89 / 10 0 0 0
DLS 61 85 58 87 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...RED FLAG WARNING UNTIL 10 PM PDT THIS EVENING FOR WAZ690-691.
OR...RED FLAG WARNING UNTIL 10 PM PDT THIS EVENING FOR ORZ691.
DISCUSSION...95
AVIATION...71
FIRE WEATHER...95
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