110 
FXUS66 KPDT 282100
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
200 PM PDT Mon Jul 28 2025

.DISCUSSION...Satellite and radar imagery shows mostly clear skies 
across the region with convection activity developing over the 
eastern mountains. With the S/SW flow aloft continuing along the 
ridge, isolated to scattered thunderstorms will remain being our 
popular threat through tomorrow during afternoon and evening hours 
over central OR to the eastern mountains. This has led us to
issuing a Red Flag Warning for Tuesday from 1 PM to 11 PM for OR
ORZ697-698-700-705 and a Fire Weather Watch for ORZ696-699. Low 
to moderate instability persists with MUCAPE values of 500-1000 
J/Kg, effective shear at 20-30kts and anomalously high PWATs 
(>0.70 inches). These parameters show that these storms' severity 
may become slight to enhanced. For Wednesday, the SPC Outlook 
shows general risk for thunderstorms across majority of our 
region. Slight chance (<30%) of these storms may develop over 
Deschutes County through Grant County before showers linger late 
Wednesday evening into overnight. 

Thunderstorms may become mainly dry with chances of wetting rain 
(CWR) less than 0.10 inches, thanks to the upper ridge and thermal 
trough. This will increase potential for abundant lightning to 
impact any new or ongoing fires. Strong winds may also develop, 
given the wind parameters show inverted-V sounding profiles, DCAPE
above 900, and steep lapse rates for dry microburst. These storms
will then gradually move across the eastern mountains and 
portions of the Foothills of the Blues-OR by Friday night. We 
should have a break over the weekend into Monday across most 
locations, though the Wallowas may have a slight chance (<20%) of 
thunderstorms around Monday afternoon. Convection activity should 
weaken during overnight hours, leaving behind light showers. Fire 
weather concerns will remain elevated for abundant 
lightning/severe winds that could impact any fires in these 
aforementioned locations. 

Tomorrow and Wednesday will be our hottest days of this week with 
high temperatures reaching from the high 90s to the triple digits. 
Thursday onwards, temps will cool by a few degrees once a weak 
system arrives. Winds will be breezy (15-25 mph) through Wednesday 
before increasing to locally windy conditions around the Gorge and 
Kittitas Valley Thursday afternoon into the weekend. Feaster/97 

&&

.AVIATION...18Z TAFs(Previous Discussion)...VFR conditions 
throughout the TAF period. Slight chances (15-30%) for thunderstorms 
to develop across KRDM/KBDN this afternoon into evening hours, with 
the best chances at KBDN. This may reduce VSBYs and CIGs to MVFR or 
lower for those aforementioned sites. Other than that, winds will 
generally be around 10kts or less for most sites with an exception 
of KDLS/KBDN having gusts of 20-25kts from this afternoon through 
late evening. Feaster/97

.PRELIMINARY POINT TEMPS/POPS...
PDT  62  99  65  99 /  10   0  10   0 
ALW  67 100  70 100 /  10   0   0   0 
PSC  60 101  62 102 /   0   0   0   0 
YKM  62  99  67 101 /   0  10   0  10 
HRI  62 102  65 102 /   0   0   0   0 
ELN  61  98  66  99 /   0   0   0  10 
RDM  52  94  56  93 /  20  10  20  20 
LGD  61  94  62  95 /  10  10  10  10 
GCD  59  94  60  94 /  30  20  30  20 
DLS  65 101  69 101 /   0   0   0  10 

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Fire Weather Watch from Tuesday afternoon through Tuesday 
     evening for ORZ696-699.

     Red Flag Warning from 2 PM to 11 PM PDT Tuesday for ORZ697-698-
     700-705.

WA...None.
&&

$$

SHORT TERM...97
LONG TERM....97
AVIATION...97