534
FXUS66 KPDT 021048
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
348 AM PDT SUN AUG 2 2026
KEY MESSAGES
- WARMING TREND NEXT WEEK.
DISCUSSION
A TIGHT ZONAL FLOW PATTERN IS IN PLACE AT THE BASE OF A MORE
BROAD MID LEVEL TROUGH ACROSS THE COLUMBIA BASIN . A THERMAL
TROUGH WAS ALSO DEVELOPING ALONG THE NRN CA AND SRN OR COASTS.
MODELS SHOW THE NORTHWARD DEVELOPMENT OF THE THERMAL TROUGH
THROUGH MONDAY AS AN UPPER RIDGE BUILD BACK OVER THE CASCADES
BEHIND THE EXITING SHORTWAVE. AS THE UPPER RIDGE BUILDS THROUGH
THE WEEK, HOTTER TEMPERATURES ARE EXPECTED TO DEVELOP EACH
AFTERNOON THROUGH THURSDAY; THURSDAY WILL BE THE HOTTEST DAY
WITH WIDESPREAD UPPER 90S ACROSS THE COLUMBIA BASIN, SNAKE RIVER
AND JOHN DAY BASINS. HEAT RISK WILL BE WIDESPREAD IN THE MINOR
CATEGORY (YELLOW) WITH SOME LOCALLY MODERATE WEDNESDAY ONTO
SATURDAY. THURSDAY WILL THE THE WARMEST DAY WITH AREAS OF OF
MODERATE HEAT RISK AFFECTING THOSE SENSITIVE TO HEAT AND WITHOUT
COOLING TO HYDRATION, AND SOME HEALTH SYSTEMS. FOLLOWING INTO
THE WEEKEND, THE UPPER RIDGE APPEARS TO FLATTER BASED ON THE
GFS/EC AS SHORTWAVE ENERGY MOVES ACROSS BC. THIS PATTERN WOULD
EASE THE HEAT WHILE REMAINING DRY. THE 6 TO 10 DAY OUTLOOK LEANS
DRYER THAN NORMAL WITH WARMER THAN NORMAL TEMPERATURES FOR THE
AUGUST 7 TO 11 PERIOD.
AVIATION /12Z TAFS THROUGH 12Z MONDAY/
NIGHTTIME MICROPHYSICS RGB SATELLITE CHANNEL IS SHOWING CLEAR
SKY WITH SOME STRATUS ALONG HE CASCADES AND PATCHY 4-5KFT
STRATUS IN THE OREGON COLUMBIA BASIN. WINDS TODAY WILL BE
LIGHTER AS HIGH PRESSURE DOMINATES.
FIRE WEATHER
RELATIVE HUMIDITY WILL REMAIN CRITICAL OVER THE NEXT WEEK. WIND
WILL BE LACKING ENOUGH TO PREVENT ANY RISK OF WIDESPREAD RED
FLAG CRITERIA. RED FLAG CRITERIA COULD BE MET ON A MORE LOCALIZE
BASIS AND MAINLY IN THE LAST FEW HOURS OF THE AFTERNOON AS
AFTERNOON MIXING/WIND GUSTS BECOME MAXIMIZED WITH THIS WEATHER
PATTERN.
PRELIMINARY POINT TEMPS/POPS
PDT 77 45 81 50 / 0 0 0 0
ALW 78 51 83 55 / 0 0 0 0
PSC 82 50 86 53 / 0 0 0 0
YKM 81 51 84 56 / 0 0 0 0
HRI 80 51 85 54 / 0 0 0 0
ELN 74 49 82 55 / 0 0 0 0
RDM 79 38 83 44 / 0 0 0 0
LGD 78 46 83 49 / 0 0 0 0
GCD 81 45 85 48 / 0 0 0 0
DLS 79 56 87 60 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...AIR QUALITY ALERT UNTIL FURTHER NOTICE FOR WAZ028>030.
OR...AIR QUALITY ALERT UNTIL 2 PM PDT MONDAY FOR ORZ044-049-050-502-
503-505>511.
DISCUSSION...71
AVIATION...71
FIRE WEATHER...71
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