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Hydrologic Outlook

Hydrologic Outlook
ORZ001-003-005>007-010-011-014>016-WAZ019>022-039-040-045-046-
200000-

Hydrologic Outlook
National Weather Service Portland OR
439 AM PDT Thu Oct 19 2017

...HEAVY RAIN LIKELY THIS WEEKEND ACROSS SOUTHWEST WASHINGTON AND
PORTIONS OF NORTHWEST OREGON...

Heavy rain appears likely this weekend across southwest Washington
and northwest Oregon, as a warm front lifts northeast across
Oregon and stalls near the Washington border. Meanwhile, a strong
and moist Pacific jet stream will run parallel to this front,
resulting in areas of heavy rainfall across the Pacific Northwest.

While some details remain uncertain, forecast models are showing
fairly good agreement in placing the heaviest rain from this event
in the higher terrain of southwest Washington and far northwest
Oregon. These areas stand to see 3 to 6 inches of rain this
weekend, though this precipitation may start out as snow in the
higher elevations of the Cascades. Coastal and lowland areas of
southwest Washington are expected to receive 2 to 4 inches of rain
this weekend, while the Willamette Valley and Lane County will
generally receive 1 to 2 inches. These numbers may still change
depending on where the frontal zone stalls.

Rainfall totals of this magnitude may be enough to trigger debris
flows and landslides in burn scar areas such as those from the
Eagle Creek Fire in the Columbia Gorge, as well as for the
Whitewater and other recent burns in the Cascades.

While significant rises are expected on many area rivers, mainstem
river flooding is not anticipated at this time. However, minor
urban and small stream flooding is possible, especially where
storm drains are clogged. Creeks and smaller rivers such as the
Grays River near Rosburg may be prone to minor flooding as well.

The National Weather Service will continue to monitor the rivers
closely and issue watches and warnings if needed. People living
near southwest Washington and northwest Oregon rivers should
monitor the latest weather and river conditions for the next week.
Listen to NOAA weather radio or check weather.gov/portland for
further updates.


$$

Weagle




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