* WHAT...Heavy snow expected. Additional snow accumulations of 4 to
12 inches above 4000 feet.
* WHERE...Stevens Pass, Holden Village, Washington Pass, and Loup
Loup Pass.
* WHEN...Until 4 PM PST Monday.
* IMPACTS...Travel could be very difficult over mountain passes.
ESFPQR
A series of storms will bring ample precipitation to Northwest
Oregon and Southwest Washington this week. Of particular concern is
the potential for heavy rain Tuesday night through Friday morning,
which could result in some flooding for area creeks and rivers.
The latest projections of the most likely amounts for storm total
precipitation are a little lower today than yesterday's forecasts.
Amounts range from 3.5 to 6 inches for the Coast, Coast Range, and
Cascades, with 1.5 to 3 inches for inland valley locations,
including Portland, Salem, and Eugene. Upper end projections, with
about a 10 percent chance of occurring, range from 6 to 10 inches
for the Coast, Coast Range, and Cascades, and 2.5 to 3.5 inches for
inland valleys. Snowmelt in the Cascades from 2000 to 4000 feet
elevation could add runoff, although runoff from heavy rain would be
the main driver for any flooding that occurs.
Rivers will rise starting Wednesday. Small streams and
fast-responding rivers could see flooding as early as Wednesday
night or Thursday, with slow-responding rivers potentially flooding
by this weekend. Heavy rainfall will also cause water ponding in low
lying areas and other areas of poor drainage.
Monitor weather.gov/portland for the latest updates and any watches,
warnings, or advisories that may be issued for this event.
* WHAT...Minor coastal flooding expected. Inundation of around 2
feet above ground level is possible along shorelines and low-
lying coastal areas.
* WHERE...San Juan County, Western Whatcom County, Southwest
Interior, Western Skagit County, Everett and Vicinity, Tacoma
Area, Admiralty Inlet Area, Hood Canal Area, Seattle and
Vicinity and Bremerton and Vicinity zones.
* WHEN...From 5 AM to 10 AM PST Monday.
* IMPACTS...Minor coastal flooding due to tidal overflow is
expected around high tide. This may lead to flooding of
parking lots, parks, and roads, with only isolated road
closures expected.
* WHAT...Minor coastal flooding expected. Inundation of around 2
feet above ground level is possible along shorelines and low-
lying coastal areas.
* WHERE...Eastern Strait of Juan de Fuca and Western Strait of
Juan De Fuca zones.
* WHEN...Until 5 PM PST this afternoon.
* IMPACTS...Minor coastal flooding due to tidal overflow is
expected around high tide. This may lead to flooding of
parking lots, parks, and roads, with only isolated road
closures expected.
* WHAT...Significant coastal flooding expected. Inundation of
around 2.5 feet above ground level is possible along shorelines
and low-lying coastal areas.
* WHERE...North Coast and Central Coast zones.
* WHEN...Until 4 PM PST this afternoon.
* IMPACTS...Significant coastal flooding due to high tides and
storm surge is expected. This is expected to lead to numerous
road closures. Low lying property including homes, businesses,
and some critical infrastructure may be inundated. Shoreline
erosion or damage may occur.
Heavy rainfall in the Olympics will force sharp rises on the
Skokomish River in Mason County Tuesday night and Wednesday with
flooding possible.
* WHAT...Flooding caused by excessive rainfall is possible.
* WHERE...A portion of northwest Washington, including the following
county, Mason.
* WHEN...From late Tuesday night through Wednesday afternoon.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
* ADDITIONAL DETAILS...
- Two to three inches of rain in the Olympics will force sharp
rises on the Skokomish River with flooding possible.
- http://www.weather.gov/safety/flood
* WHAT...Minor coastal flooding expected. Inundation of around 2
feet above ground level is possible along shorelines and low-
lying coastal areas.
* WHERE...Eastern Strait of Juan de Fuca and Western Strait of
Juan De Fuca zones.
* WHEN...Until 5 PM PST this afternoon.
* IMPACTS...Minor coastal flooding due to tidal overflow is
expected around high tide. This may lead to flooding of
parking lots, parks, and roads, with only isolated road
closures expected.
* WHAT...Significant coastal flooding expected. Inundation of
around 2.5 feet above ground level is possible along shorelines
and low-lying coastal areas.
* WHERE...North Coast and Central Coast zones.
* WHEN...Until 4 PM PST this afternoon.
* IMPACTS...Significant coastal flooding due to high tides and
storm surge is expected. This is expected to lead to numerous
road closures. Low lying property including homes, businesses,
and some critical infrastructure may be inundated. Shorline
erosion or damage may occur.
...WINTER WEATHER HIGHLIGHTS...
.A cold front passage moves across the region today through this
evening, which will lower snow levels and increase snowfall under
these currently warned areas.
* WHAT...Heavy mixed precipitation below 4000ft with snow above
4000ft. Additional snow accumulations between 6 and 12 inches
above 4000ft and 3 to 6 inches below 4000 feet. Winds gusting as
high as 40 mph.
* WHERE...In Oregon, Northern Blue Mountains of Oregon. In
Washington, Northwest Blue Mountains.
* WHEN...Until 10 PM PST Monday.
* IMPACTS...Heavy snowfall rates resulting in significant
accumulation will combine with low visibility to create very
difficult driving conditions.
...WINTER WEATHER HIGHLIGHTS...
.A cold front passage moves across the region today through this
evening, which will lower snow levels and increase snowfall under
these currently warned areas.
* WHAT...Heavy snow above 2500 ft. Additional snow accumulations
around 6-10 inches at pass levels and up to 1-2 ft over the higher
mountains. Winds gusting as high as 35 mph.
* WHERE...Upper Slopes of the Eastern Washington Cascades Crest.
* WHEN...Until 10 PM PST Monday.
* IMPACTS...Heavy snowfall and very low visibility will create
extremely dangerous driving conditions.
* WHAT...Heavy snow expected. Additional snow accumulations of 7 to
15 inches above 4000 feet.
* WHERE...Stevens Pass, Holden Village, Washington Pass, Loup Loup
Pass
* WHEN...Until 10 PM PST Monday.
* IMPACTS...Travel could be very difficult over mountain passes.
* WHAT...Heavy snow expected. Total snow accumulations of 10 to 30
inches at pass level, up to 3 to 4 feet above 5500 feet. Winds
gusting as high as 45 mph.
* WHERE...West Slopes of the Northern and Central Oregon
Cascades, and South Washington Cascades.
* WHEN...From 10 AM PST Sunday to 10 PM PST Monday.
* IMPACTS...Travel could be very difficult. Patchy blowing snow
could significantly reduce visibility.
* WHAT...Minor coastal flooding expected. Inundation of around 2
feet above ground level is possible along shorelines and low-
lying coastal areas.
* WHERE...Eastern Strait of Juan de Fuca and Western Strait of
Juan De Fuca zones.
* WHEN...For the first Coastal Flood Advisory, until 5 PM PST
this afternoon. For the second Coastal Flood Advisory, from 10
AM to 5 PM PST Sunday.
* IMPACTS...Minor coastal flooding due to tidal overflow is
expected around high tide. This may lead to flooding of
parking lots, parks, and roads, with only isolated road
closures expected.
* WHAT...Significant coastal flooding expected. Inundation of
around 2.5 feet above ground level is possible along
shorelines and low-lying coastal areas.
* WHERE...North Coast and Central Coast zones.
* WHEN...From 9 AM to 4 PM PST Sunday.
* IMPACTS...Coastal flooding due to tidal overflow is expected
around high tide. This may lead to flooding of parking lots,
parks, and roads, with road closures expected.
* WHAT...Minor coastal flooding expected. Inundation of around 2
feet above ground level is possible along shorelines and low-
lying coastal areas.
* WHERE...San Juan County zone.
* WHEN...From 4 AM to 10 AM PST Sunday.
* IMPACTS...Minor coastal flooding due to tidal overflow is
expected around high tide. This may lead to flooding of
parking lots, parks, and roads, with only isolated road
closures expected.
* WHAT...Minor coastal flooding expected. Inundation of around 2
feet above ground level is possible along shorelines and low-
lying coastal areas.
* WHERE...Western Whatcom County, Southwest Interior, Western
Skagit County, Everett and Vicinity, Tacoma Area, Admiralty
Inlet Area, Hood Canal Area, Seattle and Vicinity and
Bremerton and Vicinity zones.
* WHEN...From 4 AM to 10 AM PST Sunday.
* IMPACTS...Minor coastal flooding due to tidal overflow is
expected around high tide. This may lead to flooding of
parking lots, parks, and roads, with only isolated road
closures expected.
Colder air moving into the area behind a cold front will lower snow
levels in the Cascades to near 2000 feet Sunday morning. Snow levels
remaining near 2000 feet into Monday morning.
* WHAT...Heavy snow expected at or above elevations greater than
2000 ft. Total snow accumulations between 6 and 18 inches.
Heaviest accumulations likely near Stevens Pass with a convergence
zone.
* WHERE...West Slopes North Cascades and Passes, West Slopes North
Central Cascades and Passes, and West Slopes South Central
Cascades and Passes.
* WHEN...From 5 AM Sunday to 10 AM PST Monday.
* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous. Travel could be very difficult.
...WINTER WEATHER HIGHLIGHTS...
.An upper level trough will push a warm front across the region
overnight followed by a cold frontal passage late Sunday. Snow
levels will start out low and then rise overnight through Sunday
before lowering again late Sunday. This will produce some initial
mountain snow tonight, with some freezing rain also possible, before
turning to rain then returning to snow late Sunday through Monday.
* WHAT...Heavy mixed precipitation Above 4000 ft. Additional snow
accumulations between 8 and 11 inches...and ice accumulations
around one tenth of an inch tonight through Sunday morning. Total
snow accumulations 3 to 6 inches below 4000 feet. Winds gusting as
high as 40 mph.
* WHERE...In Oregon, Northern Blue Mountains of Oregon. In
Washington, Northwest Blue Mountains.
* WHEN...Until 10 PM PST Monday.
* IMPACTS...Periods of moderate and heavy snow will combine with low
visibilities to create difficult driving conditions.
