Lower Columbia and I - 5 Corridor in Cowlitz County

 Flood Warning  Statement as of 10:14 am PST on December 20, 2014


The National Weather Service in Portland has issued a

* Flood Warning for
the Grays River near Rosburg.
* From this evening to late Sunday night... or until the warning is
cancelled.
* At 8 am Saturday the stage was... 7.4 feet / 1200 cfs.
* Flood stage is 12.0 feet and flood flow is 8300 cfs.
* Minor flooding is forecast.
* Forecast... this river is forecast to rise above flood stage around
9 PM Saturday and is expected to crest at 12.7 ft around 4 am
Sunday.
* Impact... above 12.0 feet, expect some flooding of roads along and
near the Grays River, including roadway approaches to the Altoona
bridge over the Grays, and portions of Covered Bridge Road,
Barr-durrah Road, and loop Road near Rosburg and Hwy 4.


Lat... Lon 4630 12368 4631 12370 4636 12361 4637 12355 4635 12356





 Areal Flood Advisory, Areal Flood Watch  Statement as of 12:36 PM PST on December 20, 2014


The National Weather Service in Portland has issued a

* Urban and Small Stream Flood Advisory for...
western Yamhill County in northwestern Oregon...
Clatsop County in northwestern Oregon...
Tillamook County in northwestern Oregon...
Pacific County in southwestern Washington...
Wahkiakum County in southwestern Washington...

* until 330 PM PST

* at 1230 PM PST... emergency management and law enforcement have
reported issues with low lying roads flooding in northwest Oregon
and southwest Washington due to 1 to 3 inches of rain this
morning.

* Some locations that will experience flooding include...
Astoria... seaside... Warrenton... Cannon Beach... Long Beach...
Garibaldi... Manzanita... Grays River... Jewell... Pacific City...
Frances... Tillamook... Ocean Park... Raymond... South Bend... Rockaway
Beach... Ilwaco... Netarts... Camp rilea and Skamokawa.

This includes the following highways in Washington...
U. S. Highway 101 between mile markers 5 and 38... and between mile
markers 52 and 66.
State Route 4 between mile markers 1 and 34.
State Route 6 between mile markers 1 and 27.

This includes the following highways in Oregon...
U.S. Highway 26 west of Portland between mile markers 1 and 30.
U.S. Highway 30 west of Portland between mile markers 74 and 93.
U.S. Highway 101 between mile markers 6 and 93.
State Highway 6 between mile markers 1 and 28.

Precautionary/preparedness actions...

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams... as well as farm and country roads. Do not
attempt to travel across flooded roads. Find alternate routes.

Landslides and debris flows are possible during this flood event.
People... structures and roads located below steep slopes... in canyons
and near the mouths of canyons may be at serious risk from rapidly
moving landslides.


Lat... Lon 4679 12337 4620 12323 4617 12342 4514 12346
      4513 12398 4623 12403 4615 12382 4618 12386
      4619 12332 4626 12349 4626 12348 4627 12408
      4664 12407 4665 12406 4637 12401 4670 12383
      4679 12410


Neuman


821 am PST Sat Dec 20 2014

... Flood Watch remains in effect from 4 PM PST this afternoon
through Monday afternoon for southwest Washington and northwest
Oregon...

The Flood Watch continues for southwest Washington and northwest
Oregon from 4 PM PST this afternoon through Monday afternoon.


A classic atmospheric river type precipitation event is setting up
over the Pacific northwest today... which will continue to impact
the region into early Monday. A very long fetch of moisture with
origins west to the South China Sea is feeding into this
system... bringing the potential for very large rainfall totals
across the region. A deep and moist westerly flow will develop
today and continue through Sunday. With the flow forecasted to
remain perpendicular to the Coast Range and Cascades for an
extended period of time... expect strong orographic enhancement to
lead to the highest rainfall totals over the mountains. The Coast
Range... foothills and Cascades are expected to see in the range of
6 to 12 inches of rain... with locally higher amounts possible.
Lower but still significant totals are expected for the lower
terrain. Projected rainfall along the coast is forecasted to be
around 4 to 8 inches. The interior lowlands should see 1 to 4
inches... with the highest amounts closer to the Cascade foothills.

Given the latest forecasted rainfall totals... it appears that
there is the strong potential for flooding over the weekend on
numerous rivers and tributaries draining the Coast Range and
Cascades. A few rivers may even reach major flood stage. The
Current River stage forecasts indicate that the faster responding
rivers could reach flood stage as early as tonight. There are also likely
to be impacts from Urban and Small Stream flooding and flooding
along low lying pasture land.

In addition to the flooding concerns... excessive rainfall has the
potential to create landslides... debris flows... and excessive runoff
in the vicinity of recent wildfire burn scars. Burn scars from two
large fires this Summer... the 36 pit fire in the Clackamas river
basin near Estacada and the deception complex near Oakridge... will
be particularly vulnerable.


Precautionary/preparedness actions...

A Flood Watch means there is a potential for flooding based on
current forecasts.

Landslides and debris flows are possible during this flood event.
People... structures and roads located below steep slopes... in
canyons and near the mouths of canyons may be at serious risk
from rapidly moving landslides.

You should monitor later forecasts and be alert for possible
flood warnings. Those living in areas prone to flooding should be
prepared to take action should flooding develop.

The next update for this watch will be issued by 10 PM Saturday
night.





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