FXUS66 KPDT 201705

AFDPDT



Area Forecast Discussion

National Weather Service Pendleton OR

1005 AM PDT Sat Jun 20 2026



.KEY MESSAGES...

- Critical Fire Weather conditions will occur today as dry and 

  locally breezy conditions develop.



- Heat Risk values increase starting early next week as an

  offshore ridge pushes through the area.



- Dry conditions prevail through at least the second half of

  next week.



&&



.DISCUSSION...

Today through Sunday: Satellite currently shows high FEW to SCT

clouds across the region, with radar showing very light showers

in eastern Grant and southern Wallowa counties. Precip will dry

out by the morning hours, paving the way for drier conditions

later on. Forecast wise, the latest deterministic guidance from

the EURO and GFS currently show a shortwave passing through the

region, which will help in the development of locally breezy

winds across the region. With relative humidities during the 

day ranging from 10-20% and the previously mentioned breezy 

winds, critical fire weather concerns will occur from the 

Kittitas Valley down to the Columbia Basin down to Central 

Oregon. Fire weather zones WA690, WA691, OR691, and OR700 have 

been warned for Red Flag Warnings through much of today as a 

result.



Monday through Wednesday: A ridge currently situated just

offshore in the Pacific will continue to push on-shore through

the next several days. Current guidance is in good agreement 

the ridge axis will move over the area sometime late Monday 

night through Tuesday morning (>90% chance). This will initiate 

a warming trend early next-week through mid next-week with the 

hottest days looking to be Tuesday and Wednesday (60-80% 

chance). NBM has slightly trended down with the high 

temperatures compared to last night, shying further from the 

triple digits. Latest NBM still only advertises the chances of 

triple digits reaching the lower elevations at 0-20%, with a 

somewhat slight downtrend compared to 24-hours ago. Regardless, 

widespread moderate heat risk through the region will develop 

Tuesday & Wednesday with isolated major heat risks across the 

Columbia Basin at this time. Confidence in major heat risk 

(40-70% chance) has initiated an extreme heat watch for The 

Dalles on Tuesday. Still plenty of time to monitor for trends 

and if additional high lights are warranted.



&&



.AVIATION /18Z TAFS THROUGH 18Z SUNDAY/...

VFR conditions will persist through the forecast period. 

Winds will be breezy across all TAF sites through the period before 

winds decrease below 10 kts after 07Z. Otherwise, winds will be 12-

20 sustained with gusts as high as 22-30 kts possible. 

Confidence in the winds is moderate to high between 60-80% 

probabilities. CIGs will remain SCT/FEW250 through the late 

morning before breaking away to SKC. 



&&



.Preliminary Point Temps/PoPs...

PDT  84  50  84  52 /   0   0   0   0 

ALW  86  56  85  58 /   0   0   0   0 

PSC  91  54  89  57 /   0   0   0   0 

YKM  90  54  88  57 /   0   0   0   0 

HRI  86  54  87  55 /   0   0   0   0 

ELN  81  51  84  54 /   0   0   0   0 

RDM  83  41  83  46 /   0   0   0   0 

LGD  83  46  81  48 /   0   0   0   0 

GCD  86  44  84  45 /  10   0   0   0 

DLS  81  55  88  60 /   0   0   0   0 



&&



.PDT WATCHES/WARNINGS/ADVISORIES...

WA...Red Flag Warning from 3 PM this afternoon to 8 PM PDT this 

     evening for WAZ691.

     Extreme Heat Watch from Monday morning through Tuesday evening 

     for WAZ024.

     Wind Advisory from 3 PM this afternoon to midnight PDT tonight 

     for WAZ026.

     Red Flag Warning from 4 PM this afternoon to 8 PM PDT this 

     evening for WAZ690.

OR...Red Flag Warning from 3 PM this afternoon to 8 PM PDT this 

     evening for ORZ691-700.

     Extreme Heat Watch from Monday morning through Tuesday evening 

     for ORZ041.



&&



$$



DISCUSSION...95

AVIATION...90