776
FXUS66 KPDT 191056
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
356 AM PDT TUE MAY 19 2026
KEY MESSAGES
- BREEZY TO LOCALLY WINDY TODAY
- CONTINUED DRY WITH A WARMING TREND THIS WEEK
DISCUSSION
LATER THIS AFTERNOON AND EVENING, BREEZY GAP WINDS WILL DEVELOP
ACROSS THE CASCADES MAINLY THE EASTERN COLUMBIA RIVER GORGE AND
THE KITTITAS VALLEY, WITH GUSTS OF 15 TO 25 MPH AROUND DLS AND
ELN, AND HIGHER GUSTS. THIS IS IN PART TO AN UPPER RIDGE
BUILDING ACROSS THE REGION WITH INCREASED CROSS CASCADE
GRADIENTS. NBM MEMBERS INDICATE ABOUT A 30 TO 60% CHANCES FOR
WIND GUSTS 40 MPH OR HIGHER, BETWEEN ABOUT 4 AND 8 PM THIS
EVENING.
THE NEXT FEATURE IS A SHORTWAVE MODELED TO SWING SOUTHEAST
THROUGH THE NORTHERN ROCKIES OF MONTANA INTO CO WEDNESDAY
EVENING, TURNING WINDS FROM LIGHT AND VARIABLE OR WESTERLY, TO
DEFINITIVELY AN NORTHEASTERLY , BUT STILL LIGHT, ON THURSDAY.
TEMPERATURES WILL STILL BE TRENDING WARMER THOUGH THIS PERIOD
ALTHOUGH HEATRISK IS STILL COMPUTED IN THE CATEGORY1 LEVEL.
SIGNIFICANT DIFFERENCES OR SPREAD IS SEEN IN THE ENSEMBLES AND
SPECIFICALLY THE CLUSTER ANALYSIS FOR THE WEEKEND, WITH RESPECT
TO THE TIMING AND DEPTH /AMPLITUDE OF AN APPROACHING WEST COAST
500 MB TROUGH DAYS 5-7. THESE PATTERNS DO NOT HAVE SIGNIFICANT
IMPLICATIONS FOR WIND OR PRECIPITATION OTHER THAN CLUSTER3 (THE
FLAT RIDGE) BEING DRIER THAN THE REST, WITH AT 26% OF THE MEMBER
BY MONDAY KEEPING THE MOUNTAINS ZONES DRY WHEREAS OTHER
CLUSTERS FORECAST AT LEAST A FEW HUNDREDTHS OF AN INCH OF LIGHT
RAIN IN THE COLUMBIA BASIN AND EVEN WETTING RAINS IN THE CASCADE
CREST ON A 24 HOUR BASIS.
AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/
DRY, VFR FLIGHT CATEGORY CONDITIONS ARE EXPECTED FOR THE
DURATION OF THE TAF PERIOD. GUSTY WINDS ARE ANTICIPATED AT ELN
AND DLS DUE TO MOUNTAIN GAP WINDS DEVELOPING EARLIER IN THE
DAY. PSC AND PDT SHOULD ALSO HAVE BREEZY SOUTHWEST WINDS.
PRELIMINARY POINT TEMPS/POPS
PDT 72 45 73 46 / 0 0 0 0
ALW 72 50 73 49 / 0 0 0 0
PSC 77 48 79 50 / 0 0 0 0
YKM 75 47 79 50 / 0 0 0 0
HRI 75 48 77 48 / 0 0 0 0
ELN 68 43 73 45 / 0 0 0 0
RDM 72 37 74 39 / 0 0 0 0
LGD 68 40 70 41 / 0 0 0 0
GCD 70 38 73 39 / 0 0 0 0
DLS 73 49 78 50 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...71
AVIATION...71
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