Flood Potential Outlook
Issued by NWS Pendleton, OR

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ORZ049-050-502-503-505-507-508-WAZ026-027-029-030-520-521-300000-

Hydrologic Outlook
National Weather Service Pendleton OR
315 PM PDT Tue Mar 28 2017

...Rain and higher elevation snow melt may cause localized
flooding issues later this week....

Small stream flooding may develop or increase late this week as a
storm system brings warmer air and periods of rain to the region
Wednesday through Thursday. This will be followed by mainly dry
weather and near normal temperatures Friday. Overnight lows across
the higher elevations will dip into the 20s and lower 30s at the
end of the week, which should help to at least slow the snow melt
some.

Moderate rainfall will likely lead to an increase of ponding of
water and higher flows on smaller rivers and streams that
originate in the higher terrain around the Kittitas and Yakima
Valleys, as well as across the northeast Oregon mountains.
Precipitation amounts through Thursday morning are expected to
range from 1 to 2 inches along the immediate Cascade Crest and
across the northern Blue Mountains, with half an inch to one inch
along the East Slopes of the Cascades. A quarter to half inch of
precipitation is expected in the Simcoe Highlands. Rainfall
amounts in the Yakima and Kittitas Valley will likely remain under
a quarter of an inch. Snow levels start out between 4000 and 5000
feet early Wednesday, rising to 7000-8500 feet later Wednesday
and Wednesday night, before falling back to near 3000 feet
Thursday.

Streams will remain high through the week as increased snowmelt
is seen with the warmer temperatures this week.

River rises on mainstem rivers will also be seen. Flooding may be
possible on the Grande Ronde River at Troy and on the John Day
River at Service Creek late this week.

Residents are encouraged to monitor this weather situation for
updates, watches or warnings. People who live along streams or
rivers should monitor water levels closely.

$$



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