141 
FXUS66 KPDT 260209
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
709 PM PDT Thu Jul 25 2019

.SHORT TERM...Satellite shows mid and high level clouds moving
northward into Oregon. South to southwest flow aloft will continue
overnight into Friday. Mid and high level clouds over California
and Nevada will continue to move across much of the forecast area
with partly cloudy skies. Instability and any isolated thunderstorm
activity late Friday should remain just south of the region. 
Meanwhile an upper low moving into BC will push a weak cold front 
through the area late in the day with increasing westerly winds.
Humidity profiles remain very dry in the low levels tonight into
Friday and this will create a high fire danger with the increasing
winds for the afternoon and evening. Smoke from fires over the
Washington Cascade east slopes will drift into the Columbia basin
with hazy conditions overnight and Friday. 94

&&

.PREV DISCUSSION... /issued 111 PM PDT Thu Jul 25 2019/ 

SHORT TERM...Tonight through Sunday...A dry SW-W flow regime will 
be over the region for the next few days. A cold front will cross 
the region Friday. Ahead of the front it will be hot with afternoon 
temperatures well into the 90s in the lower elevations and 80s in 
the mountains. At the present time it looks like any thunderstorm 
activity with the front will remain south and east of the forecast 
area. Winds will pick up in the Cascade gaps late in the afternoon 
Friday and continue in the evening before diminishing overnight 
Friday night. Saturday looks to be breezy and a bit cooler with high 
temperatures about 5-7 degrees lower than on Friday. The fair 
weather is expected to continue on Sunday with mostly clear skies, 
lighter winds and near normal temperatures. 78

LONG TERM...Sunday night through Thursday.  Dry conditions with 
seasonal temperatures will prevail through the extended period as 
the overall westerly flow pattern remains over the northwest. A weak 
trough will move inland and fill Sunday night and Monday and again 
Wednesday with a cool front moving through.  Main effect will be 
some stronger winds through the Columbia River Gorge and through the 
gaps in the Cascades and will continue to watch for any fire weather 
concerns, but most models show the timing of stronger winds with 
increasing rh as marine air spills through.  Highs in the 80s to 
lower 90s with 70s to 80s in mountains. 93 

AVIATION...00z Tafs. Mostly clear skies and winds less than 15 
knots will continue through the next 18-24 hours.  Winds will be 
increasing at DLS to 15-20kts and gusty after 21z on Friday.  

FIRE WEATHER...A fire weather watch remains in effect for Friday 
afternoon and evening for WA and ORE fire zones 639. Gusty west 
winds and low relative humidities are expected on Friday. The 
overlap of the stronger winds and lowest RH is expected to be for a 
few hours roughly from about 22Z-02Z. Gusty winds will continue 
beyond 02Z but RH's will have recovered by then. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  56  94  61  87 /   0   0   0   0 
ALW  60  98  65  91 /   0   0   0   0 
PSC  57  98  66  92 /   0   0   0   0 
YKM  57  97  61  88 /   0   0   0   0 
HRI  56  98  64  91 /   0   0   0   0 
ELN  55  93  61  82 /   0   0   0   0 
RDM  53  92  53  87 /   0  10  10   0 
LGD  54  92  60  85 /   0   0   0   0 
GCD  55  93  57  90 /   0  10  10   0 
DLS  62  97  65  87 /   0   0   0   0 

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Fire Weather Watch from Friday afternoon through Friday evening 
     for ORZ639.

WA...Fire Weather Watch from Friday afternoon through Friday evening 
     for WAZ639.

&&

$$

94