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Fire Weather Forecast
Zone 631 (WFO Pendleton)
| NWS
Forecasts and Warnings |
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Observed
and Projected ERC and 100 hr Fuel Moisture Graphs by PSA
| ZONE
631: |
COLUMBIA BASIN OF OREGON
AND SOUTHEAST WASHINGTON (WFO Pendleton)
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This area is characterized
as flat or smooth rolling hills in the Lower Columbia Basin of Northeast
Oregon and Southeast Washington. Elevations range from about 200 ft MSL
to approximately 3000 ft MSL along the foothills of the Blue Mountains.
The weather in this area is characterized as warm to hot and dry during
the summer with little precipitation, especially July through September.
This is one of the two driest zones in the district. Precipitation averages
range from 5-8 inches at the lowest elevations of the basin to near 20
inches along the foothills of the Blue mountains. The Cascade Mountains
to the west and the Blue Mountains to the east have a considerable influence
on this area. A rain shadow is often created from weather systems that
move inland from the Pacific. Down slope foehn type winds are not uncommon
during the fire season. The Columbia River Gorge frequently causes strong
channeling of westerly winds into the area after a cold front passage,
but with little rainfall. Gusts 20-25 mph are common on ridge tops. Occasional
summer thunderstorms bring localized heavy rain, however average precipitation
July through September is about .50 inches. This zone has a low frequency
of lightning with around 5 thunderstorm days west of Arlington and 5-10
thunderstorm days east of Arlington. Agencies responsible for fire protection
in this area are ODF Pendleton, ODF The Dalles, Prineville BLM, Spokane
BLM, Vale BLM, and southeast DNR.
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Tel: (406) 329-4840
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