Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 291000
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
300 AM PDT FRI JUL 29 2016

.SHORT TERM...today through Sunday...Today will be hot and dry and
will be the warmest day with dry and stable conditions continuing
through tonight. High temperatures today will be 94-104 degrees,
except in the upper 70s to lower 90s in the mountains.

Saturday a dry cold front will usher in a marine push that will
transport slightly cooler pacific air into the region for some
relief from the hot temperatures expected today. Highs on Saturday
will be 7-9 degrees cooler. The cooling trend with dry conditions
will continue on Sunday for highs 81 to 91, except in the mid 60s to
lower 80s in the mountains.  Polan

.LONG TERM...Sunday night through Saturday...A dry and stable
westerly flow will persist on Sunday night through most of Monday.
This will keep mostly clear skies and warm temperatures over the
CWA. Then later on Monday the flow will become southwest as an upper
trough off the coast advances toward the Pacific Northwest. In
addition surface pressure gradients will increase. The result of
these features will be some increase in moisture and instability
from the southwest. Winds will also become breezy...especially along
the Cascade gaps and the east slopes/adjacent valleys. Moisture will
be limited so will keep the forecast dry for now. The flow will
become stable westerly again on Tuesday as the base of the upper
trough moves across the CWA. Temperatures will cool off a about 6 to
8 degrees on Tuesday as the upper trough moves across the region.
The westerly flow will persist through Wednesday and then a broad
upper ridge will build off the coast and move inland on Thursday.
Thus Thursday will be warmer...with a warming trend that will
continue through Friday (back to near normal readings) with dry and
stable conditions. 88

&&

.AVIATION...12Z TAFs...VFR conditions with mostly clear skies and
hot temperatures will persist today. Winds will be light through the
day but then they will increase to about 10 to 20 kts this evening
in the Lower Columbia Basin and adjacent valleys to the west of the
basin...especially in the eastern Columbia River Gorge where TAF
site KDLS will see the greatest increase in wind this evening. 88

&&

.FIRE WEATHER...After a week of hot and dry conditions, an
approaching dry cold front will result in possible extreme fire
behavior this weekend. The cold front on Saturday will cause winds
to increase throughout the Columbia Basin down to Central Oregon.
The actual start of the marine intrusion and increasing wind will
begin late Friday afternoon/evening in and around the Eastern
Columbia River Gorge and north central Oregon. The remainder of the
Basin and Central Oregon will observe increasing winds on Saturday
with winds around 12-25 mph in many areas. Although the winds on
Sunday will not be as strong...there will be 10-20 mph winds that
could remain a concern. The relative humidity Friday through Sunday
will primarily be 10-20 percent during the afternoons. Red Flag
Warnings are in effect for the Eastern Columbia River Gorge and
North Central Oregon (Fire zones WA/OR639 and OR610) for this
afternoon through Saturday evening. Fire Weather Watches are in
effect for the Columbia Basin down to Central Oregon (Fire zones
OR640, WA/OR641, OR644, and WA675) Saturday afternoon through Sunday
evening.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT 102  64  93  58 /   0   0   0   0
ALW 101  71  94  63 /   0   0   0   0
PSC 103  68  97  62 /   0   0   0   0
YKM 103  68  95  59 /   0   0   0   0
HRI 104  68  96  61 /   0   0   0   0
ELN 100  63  88  57 /   0   0   0   0
RDM  98  54  91  46 /   0   0   0   0
LGD  97  58  93  52 /   0   0   0   0
GCD  98  59  94  52 /   0   0   0  10
DLS 102  66  87  60 /   0   0   0   0

&&

.PDT Watches/Warnings/Advisories...
OR...Red Flag Warning from 3 PM this afternoon to 9 PM PDT Saturday
     for ORZ610-639.

     Fire Weather Watch from Saturday afternoon through Sunday
     evening for ORZ640-641-644.

WA...Red Flag Warning from 3 PM this afternoon to 9 PM PDT Saturday
     for WAZ639.

     Fire Weather Watch from Saturday afternoon through Sunday
     evening for WAZ641-675.

&&

$$

99/88/88



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