667 
FXUS66 KPDT 120936
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
236 AM PDT Tue Sep 12 2023

.SHORT TERM...
Today through Thursday night...Southwesterly flow early in the day
will become more westerly during the afternoon and evening as a
shortwave approaches from the west. This shortwave will bring a
chance of rain to the Washington Cascades and help tighten the
pressure gradient later this afternoon into this evening. 

By Wednesday morning, high pressure will begin to build in from
the west for the remainder of the period. The high will allow the
winds to decrease and will cause a warming trend to begin on
Thursday.

Winds will be a bit breezy today through early tonight in the
Kittitas Valley and portions of the Columbia Basin and Gorge 
through the Foothills of the Blue Mountains. WInds will gust 20 to
25 mph, with some local gusts to 30 mph. The NBM wind gust 
probabilities have 80 to 100% from Pendleton westward to the 
Dalles for wind gusts to 25 mph today and about 50% at Yakima and
90 to 100% at Ellensburg. However, probabilities drop 
considerably in most locations if we look at wind gusts to 39 mph.
At Ellensburg, they are still around 80% and the Dalles 40-50%, 
but across the Basin generally less than 20%. 

High temperatures today will range from the upper 70s to the lower
80s, with some mid 80s possible in the Columbia Basin. Highs will
be about the same or a bit cooler on Wednesday, in the wake of 
the passage of the shortwave. On THursday, temperatures will 
rebound with most everywhere in the low to mid 80s and some upper
80s are possible. Overnight lows will mainly be in the 40s and 
50s.

.LONG TERM...
Friday through Tuesday...High pressure over the Pacific Northwest
will bring continued warm and dry conditions through Sunday. 
Temperatures under the influence of this system will be 10 to 15 
degrees above normal. The warmest temperatures on Saturday are 
favored across the valleys, which are currently showing a 60-80% 
chance of reaching at least 90 degrees. Temperatures will cool 
slightly on Sunday, with lesser coverage of 90 degree temperatures
expected. 

An approaching system Sunday into Monday will cool temperatures and 
introduce pockets of shower activity. By Tuesday, temperatures are 
generally expected to cool to near normal levels. Forecast showers 
are generally confined to the Washington Cascades. However, models 
are showing some varying scenarios with the placement and strength 
of this upcoming system that could produce additional showers along 
the higher terrain of the forecast area. Branham/76

&&

.AVIATION...
Previous Discussion...06Z TAFs...VFR conditions to prevail 
through the period. CIGS of sct-bkn AOA 20kft to 25kft AGL will 
affect all sites. Winds will mostly be light, less than 12kts, 
through the period at sites RDM/BDN/YKM/ALW/PSC. Site DLS will see
winds increase to 12-20kts with gusts 25-30kts develop tomorrow 
afternoon. Site PDT will see winds increase to 12-15kts with gusts
up to 25kts possible in the afternoon tomorrow. Lawhorn/82

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  78  52  77  49 /   0   0   0   0 
ALW  81  56  79  52 /   0   0   0   0 
PSC  84  58  82  55 /   0   0   0   0 
YKM  82  50  82  49 /   0   0   0   0 
HRI  83  56  81  52 /   0   0   0   0 
ELN  79  53  80  49 /   0  10   0   0 
RDM  78  45  78  43 /   0   0   0   0 
LGD  80  49  76  47 /   0   0   0   0 
GCD  82  46  79  45 /   0   0   0   0 
DLS  81  58  84  55 /   0   0   0   0 

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
&&

$$

SHORT TERM...77
LONG TERM....76
AVIATION...76