762
FXUS66 KPDT 160531
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1031 PM PDT MON JUN 15 2026
KEY MESSAGES
- MODERATE TO MAJOR HEATRISK THIS AFTERNOON AND EVENING
- WINDY TUESDAY
- CRITICAL FIRE WEATHER CONDITIONS TUESDAY AFTERNOON AND EVENING
DISCUSSION
MID LEVEL RIDGING IS BEGINNING TO BREAK DOWN INTO WHAT WILL BE
A MORE ZONAL PATTERN HEADING INTO THE OVERNIGHT AND TUESDAY,
TRANSITIONING TO NW FLOW BY WEDNESDAY MORNING ACROSS THE
INTERIOR NW. THAT WILL ALLOW AN INCREASE IN THE GAP WINDS
STARING TONIGHT AND RESULT IN BREEZY TO WINDY CONDITIONS OVER
THE ENTIRE FORECAST AREA ON TUESDAY. BASED ON PROBABILITIES FOR
WIND GUSTS IN EXCESS OF 40 MPH, THE KITTITAS VALLEY HAS ABOUT A
90% CHANCE FOR EXCEEDANCE OF 40 MPH LENDING TO HIGH CONFIDENCE
TO HIGH END ADVISORY CRITERIA, AND PERHAPS PUSHING THE LIMITS OF
HIGH WIND CRITERIA (40 MPH SUSTAINED WINDS AND/OR 58 MPH
GUSTS). WE WILL HEDGE ON A WIND ADVISORY OVER HIGH WIND HERE AS
THE NBM MEMBERS AREA AT AROUND 34% FOR LATE AFTERNOON SUSTAINED
WINDS AT 34 KTS (39 MPH) PEAKING IN THE LATE AFTERNOON.
HEAT RISK IS AT ITS HIGHEST THIS AFTERNOON AND WILL WANE AFTER
TODAY AS THE THERMAL TROUGH BREAKS EASTWARD AND THE
TEMPERATURES ARE UNABLE TO WARM UP AS MUCH ON TUESDAY DUE TO
MIXING OF THE BOUNDARY LAYER. STILL ELEVATED OR LEVEL 2 HEATRISK
WILL CREATE CONDITIONS THAT AFFECT THOSE MORE AT RISK TO HEAT
ILLNESSES AND DO NOT HAVE ACCESS TO COOLING OR HYDRATION. A
COUPLE OF COOLER DAYS ON WEDNESDAY AND THURSDAY DIPPING INTO A
WIDESPREAD LEVEL 1 HEATRISK WILL BE FOLLOWED BY WARMING TEMPS
AGAIN FRIDAY, HOWEVER NOT AS INTENSE AS TODAY.
AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/
VFR CONDITIONS PREVAIL THROUGH THE TAF PERIOD. THE BIG HIGHLIGHT
WILL BE THE WIND THIS PERIOD, WITH GUSTS PEAKING AT 25-35 KNOTS
IN THE LATE MORNING HOURS TUESDAY, PREVAILING THROUGH THE
AFTERNOON AND EVENING IN SOME AREAS. CENTRAL OREGON SITES + ALW
WILL SEE A DECREASE IN THE WINDS SOONER BY 02-04Z, WHILE THE
OTHER SITES REMAIN BREEZY THROUGH AT LEAST THE END OF THE TAF
PERIOD. NO CIG OR VIS ISSUES EXPECTED, WITH THE SLIGHT
POSSIBILITY OF HZ PASSING THROUGH SOME OF THE COLUMBIA BASIN
AREAS DUE TO NEARBY WILDFIRES (5 TO 15 PERCENT CHANCE).
FIRE WEATHER
THE FIRE WEATHER WATCHES HAVE BEEN UPGRADED TO RED FLAG
WARNINGS FOR THE FIRE ZONES WA691/OR691 VALID TUESDAY 10 AM
THROUGH 11 PM. COMBINED PROBABILITIES FOR LOW RH AND WIND OF
25% AND 30 MPH GUSTS ARE IN THE 80 TO 90TH PERCENTILE, RESULTING
IN HIGH CONFIDENCE IN THE RISK FOR RAPID FIRE SPREADING OF ANY
STARTS TUESDAY AFTERNOON AND EVENING.
PRELIMINARY POINT TEMPS/POPS
PDT 62 89 51 84 / 0 0 0 0
ALW 66 90 55 84 / 0 0 0 0
PSC 64 94 55 89 / 0 0 0 0
YKM 62 90 55 89 / 0 0 0 0
HRI 67 91 55 87 / 0 0 0 0
ELN 62 80 52 81 / 0 0 0 0
RDM 54 89 47 87 / 0 0 0 0
LGD 55 88 49 81 / 0 0 0 0
GCD 53 91 48 85 / 0 0 0 0
DLS 69 86 57 85 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...RED FLAG WARNING FROM 10 AM TO 11 PM PDT TUESDAY FOR WAZ691.
WIND ADVISORY FROM 10 AM TO 11 PM PDT TUESDAY FOR WAZ024-026-
521.
OR...RED FLAG WARNING FROM 10 AM TO 11 PM PDT TUESDAY FOR ORZ691.
DISCUSSION...71
AVIATION...95
FIRE WEATHER...71
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