Weather Alerts for Seattle and Vicinity

Issued by the National Weather Service

Flood Warning  FLOOD WARNING   Flood Warning
SEATTLE AND VICINITY

Areas Affected:
King, WA
Effective: Fri, 12/12 8:08pm Updated: Fri, 12/12 9:37pm Urgency: Expected
Expires: Sat, 12/13 4:15am Severity:  Severe  Certainty: Likely

 
Details:
...Forecast flooding changed from Minor to Moderate severity for the
following rivers in Washington...

Green River Near Auburn affecting King County.

.Dam operations to reduce the flood pool of area dams will
increase the flow levels below the dams.

* WHAT...Minor flooding is occurring and moderate flooding is
forecast.

* WHERE...Green River near Auburn.

* WHEN...Until further notice.

* IMPACTS...At 12,000.0 cfs, the Green River will inundate low areas
from the middle Green River valley downstream to Auburn...with
water over several roads including SE Green Valley Rd and West
Valley Rd.  Levees from Auburn down through Tukwilla may exhibit
seeapage and may weaken due to saturation.  A flow of 12000 cfs on
the Green River corresponds to a phase 4 flood in the King County
flood system.

* ADDITIONAL DETAILS...
- At 6:45 PM PST Friday the flow was 11,000.0 cfs.
- Flood flow is 9,000.0 cfs.
- Recent Activity...The maximum river flow in the 24 hours
ending at 6:45 PM PST Friday was 11,000.0 cfs.
- Forecast...The river is expected to rise to a crest of
12,489.7 cfs tomorrow afternoon.
- http://www.weather.gov/safety/flood

Information:
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Additional information is available at www.weather.gov.

The next statement will be issued by late tonight at 415 AM PST.

Flood Warning  FLOOD WARNING   Flood Warning
SEATTLE AND VICINITY

Areas Affected:
King, WA
Effective: Fri, 12/12 7:20pm Updated: Fri, 12/12 9:37pm Urgency: Immediate
Expires: Sat, 12/13 3:30am Severity:  Severe  Certainty: Observed

 
Details:
...The Flood Warning is extended for the following rivers in
Washington...

Cedar River At Renton affecting King County.

.Dam operations to reduce the flood pool of area dams will
increase the flow levels below the dams.

* WHAT...Moderate flooding is occurring and moderate flooding is
forecast.

* WHERE...Cedar River at Renton.

* WHEN...Until early Monday morning.

* IMPACTS...At 14.5 feet, the Cedar River will flood areas of Renton
including the Renton Airport.

* ADDITIONAL DETAILS...
- At 6:15 PM PST Friday the stage was 15.9 feet.
- Flood stage is 13.0 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 6:15 PM PST Friday was 17.3 feet.
- Forecast...The river is expected to fall below flood stage
Sunday evening and continue falling to 12.4 feet Monday
afternoon.
- http://www.weather.gov/safety/flood

Information:
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Additional information is available at www.weather.gov.

The next statement will be issued by late tonight at 330 AM PST.

Flood Warning  FLOOD WARNING   Flood Warning
SEATTLE AND VICINITY

Areas Affected:
King, WA
Effective: Fri, 12/12 7:16pm Updated: Fri, 12/12 9:37pm Urgency: Immediate
Expires: Sat, 12/13 3:30am Severity:  Severe  Certainty: Observed

 
Details:
...The Flood Warning is extended for the following rivers in
Washington...

Cedar River Near Landsburg affecting King County.

.Dam operations to reduce the flood pool of area dams will
increase the flow levels below the dams.

* WHAT...Major flooding is occurring and major flooding is forecast.

* WHERE...Cedar River near Landsburg.

* WHEN...Until Sunday evening.

* IMPACTS...At 7.5 feet, the Cedar River will cause severe flooding
from Landsburg downstream through Maplewood. Deep and swift flood
waters will inundate many roads and some residential areas,
especially in Maple Valley.  Flooding will occur all along the
river including headwaters, tributaries, and other streams within
and near the Cedar River Basin.  A stage of 7.5 feet on the Cedar
River corresponds to a phase 4 flood in the King County flood
system.

* ADDITIONAL DETAILS...
- At 6:45 PM PST Friday the stage was 8.2 feet.
- Flood stage is 5.7 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 6:45 PM PST Friday was 8.8 feet.
- Forecast...The river is expected to fall below flood stage
late Sunday morning and continue falling to 4.9 feet Monday
afternoon.
- Flood History...This crest compares to a previous crest of
7.7 feet on 12/22/1933.
- http://www.weather.gov/safety/flood

Information:
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Additional information is available at www.weather.gov.

The next statement will be issued by late tonight at 330 AM PST.

Flood Warning  FLOOD WARNING   Flood Warning
SEATTLE AND VICINITY

Areas Affected:
King, WA
Effective: Fri, 12/12 4:17pm Updated: Fri, 12/12 9:37pm Urgency: Immediate
Expires: Sat, 12/13 12:30am Severity:  Severe  Certainty: Observed

 
Details:
...The Flood Warning is extended for the following rivers in
Washington...

Snohomish River At Snohomish affecting Snohomish County.

Snohomish River Near Monroe affecting Snohomish County.

Snoqualmie River Near Carnation affecting King County.

Cowlitz River At Randle affecting Lewis County.

...The Flood Warning continues for the following rivers in
Washington...

Cowlitz River Below Mayfield Dam affecting Lewis County.

.Flood waters will continue to drain from streams while the weather
stays mostly dry for a few days.

* WHAT...Moderate flooding is occurring and minor flooding is
forecast.

* WHERE...Snoqualmie River near Carnation.

* WHEN...Until tomorrow afternoon.

* IMPACTS...At 56.0 feet, the Snoqualmie River will cause widespread
flooding from Fall City downstream through Carnation and Duvall...
inundating much of the farm land and numerous roads.

* ADDITIONAL DETAILS...
- At 2:15 PM PST Friday the stage was 56.9 feet.
- Flood stage is 54.0 feet.
- Forecast...The river is expected to fall below flood stage
tomorrow and continue falling.
- http://www.weather.gov/safety/flood

Information:
Even 6 inches of fast-moving flood water can knock you off your feet
and a depth of 2 feet will float your car. Never try to walk, swim,
or drive through such swift water. If you come upon flood waters,
stop, turn around and go another way.

Motorists should not attempt to drive around barricades or drive
cars through flooded areas.

To escape rising water, take the shortest path to higher ground.

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Caution is urged when walking near riverbanks.

Additional information is available at www.weather.gov.

The next statement will be issued by late tonight at 1230 AM PST.

Flood Warning  FLOOD WARNING   Flood Warning
SEATTLE AND VICINITY

Areas Affected:
King, WA - Pierce, WA
Effective: Fri, 12/12 3:41pm Updated: Fri, 12/12 9:37pm Urgency: Immediate
Expires: Fri, 12/12 11:45pm Severity:  Severe  Certainty: Observed

 
Details:
...The Flood Warning continues for the following rivers in
Washington...

Cedar River At Renton affecting King County.

Green River Near Auburn affecting King County.

White River Near Mud Mtn. Dam Outflow affecting King and Pierce
Counties.

White River At R Street Bridge affecting King and Pierce Counties.

...Forecast flooding changed from Moderate to Major severity and
increased in duration for the following rivers in Washington...

Cedar River Near Landsburg affecting King County.

.Dam operations to reduce the flood pool area dams will
increase the flow levels or maintain elevated flow levels below the
dams.

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...White River at R Street Bridge.

* WHEN...Until further notice.

* ADDITIONAL DETAILS...
- At 1:45 PM PST Friday the flow was 8,630.0 cfs.
- Flood flow is 7,500.0 cfs.
- Forecast...The river is expected to rise to a crest of 9,800
cfs late tomorrow morning. The river will remain steady
through the weekend.
- http://www.weather.gov/safety/flood

Information:
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.

Caution is urged when walking near riverbanks.

Even 6 inches of fast-moving flood water can knock you off your feet
and a depth of 2 feet will float your car. Never try to walk, swim,
or drive through such swift water. If you come upon flood waters,
stop, turn around and go another way.

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Additional information is available at www.weather.gov.

The next statement will be issued by this evening at 1145 PM PST.

Flood Warning  FLOOD WARNING   Flood Warning
SEATTLE AND VICINITY

Areas Affected:
King, WA - Pierce, WA
Effective: Fri, 12/12 3:41pm Updated: Fri, 12/12 9:37pm Urgency: Immediate
Expires: Fri, 12/12 11:45pm Severity:  Severe  Certainty: Observed

 
Details:
...The Flood Warning continues for the following rivers in
Washington...

Cedar River At Renton affecting King County.

Green River Near Auburn affecting King County.

White River Near Mud Mtn. Dam Outflow affecting King and Pierce
Counties.

White River At R Street Bridge affecting King and Pierce Counties.

...Forecast flooding changed from Moderate to Major severity and
increased in duration for the following rivers in Washington...

Cedar River Near Landsburg affecting King County.

.Dam operations to reduce the flood pool area dams will
increase the flow levels or maintain elevated flow levels below the
dams.

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...White River near Mud Mtn. Dam Outflow.

* WHEN...Until further notice.

* IMPACTS...At 8,000.0 cfs, the White River will spill over its
banks below Mud Mountain Dam producing high water that will
encroach on roads and residences, particularly in the Red Creek
area. 8000 cfs on the White River is within phase 3 flood in the
King County flood system.

* ADDITIONAL DETAILS...
- At 3:00 PM PST Friday the flow was 9,550.0 cfs.
- Flood flow is 9,000.0 cfs.
- Recent Activity...The maximum river flow in the 24 hours
ending at 3:00 PM PST Friday was 9,550.0 cfs.
- Forecast...The river is expected to continue at 9500 cfs
through the weekend.
- http://www.weather.gov/safety/flood

Information:
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.

Caution is urged when walking near riverbanks.

Even 6 inches of fast-moving flood water can knock you off your feet
and a depth of 2 feet will float your car. Never try to walk, swim,
or drive through such swift water. If you come upon flood waters,
stop, turn around and go another way.

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Additional information is available at www.weather.gov.

The next statement will be issued by this evening at 1145 PM PST.

Special Weather Statement  SPECIAL WEATHER STATEMENT   Special Weather Statement
SEATTLE AND VICINITY

Areas Affected:
San Juan County - Cascades of Whatcom and Skagit Counties - Cascades of Snohomish and Northern King Counties - Cascades of Southern King County - Cascades of Pierce and Lewis Counties - Foothills and Valleys of the North Cascades - Foothills and Valleys of Snohomish and Northern King Counties - Foothills and Valleys of Central King County - Foothills and Valleys of Pierce and Southern King Counties - Foothills and Valleys of Thurston and Lewis Counties - Lowlands of Western Whatcom County - Lowlands of Western Skagit and Northwestern Snohomish Counties - Downtown Everett / Marysville Area - Shoreline / Lynnwood / South Everett Area - Eastside - City of Seattle - Lowlands of Pierce and Southern King Counties - Olympia and Southern Puget Sound - Lowlands of Lewis and Southern Thurston Counties - Middle Chehalis River Valley - Willapa and Black Hills - Southern Hood Canal - Northern Hood Canal - Eastern Kitsap County - Port Townsend Area - Eastern Strait of Juan de Fuca - Western Strait of Juan de Fuca - Lake Crescent Area Including US 101 - Olympics - Foothills of the Western and Southern Olympic Peninsula - Northern Washington Coast - Grays Harbor County Coast - Lower Chehalis River Valley - Island County
Effective: Fri, 12/12 5:02am Updated: Fri, 12/12 9:37pm Urgency: Expected
Expires: Sat, 12/13 10:00am Severity:  Moderate  Certainty: Observed

 
Details:
Rainfall of 2 to 12 inches over the past several days has increased
soil moisture to very high levels across western Washington. This
amount of rain will put extra pressure on soil instability, leading
to an increased threat of landslides and debris flows, especially
from recent burned areas.

Numerous landslides have already been reported in the western
Cascades in western Washington. More landslides are possible.

Areas most susceptible to landslides debris flows under these
conditions are steep coastal bluffs, other steep hillsides or
road cuts, and recent burned areas. A diminishing threat of
landslides and debris flows will continue for several days after
the rain ends.

For more information about current conditions, visit
www.weather.gov/seattle, select Hydrology, and then scroll down
for the links to the landslide information pages.

For more information on landslides, visit the website for the
Washington State Department of Natural Resources landslide
geologic hazards at: http://bit.ly/2mtA3wn

Hydrologic Outlook  HYDROLOGIC OUTLOOK   Hydrologic Outlook
SEATTLE AND VICINITY

Areas Affected:
Clallam, WA - Grays Harbor, WA - Jefferson, WA - King, WA - Kitsap, WA - Lewis, WA - Mason, WA - Pierce, WA - Skagit, WA - Snohomish, WA - Thurston, WA - Whatcom, WA
Effective: Fri, 12/12 5:27pm Updated: Fri, 12/12 9:37pm Urgency: Future
Expires: Sat, 12/13 6:30am Severity: Unknown Certainty: Possible

 
Details:
ESFSEW

Another moderately strong atmospheric river will impact western
Washington starting as early as Saturday night and extending into
Wednesday. Rain, heavy at times, is likely. The snow level will be
5000 feet rising to 8000 ft during the heaviest rainfall on Monday
before dropping to 3000 to 4000 feet Monday night into Tuesday. In
addition, soils will still be nearly saturated and rivers elevated
or still above flood stage.

Expect rising rivers with the potential for flooding. Urban
flooding, landslides, and debris flows are also possible throughout
this period.


Please monitor the latest river forecasts from the National Weather
Service for additional information.