2 products issued by NWS for: Downtown Seattle WA
Flood Watch
Flood Watch
National Weather Service Seattle WA
935 PM PST Thu Nov 30 2023
.An active weather pattern will continue with a series of frontal
systems set to move across the Pacific Northwest through the middle
of next week bringing multiple rounds of rain and mountain snow with
increasing intensity through the weekend and into next week. Current
snow levels around 2700 feet this evening will rise closer to 6000
to 7000 feet by Sunday and then closer to 8000 to 9000 feet Monday
evening as persistent atmospheric river moisture advects into the
Western Washington. Prolonged heavy rainfall will lead to rapid
rises on rivers Sunday into early next week, especially when
combined with melting snow as snow levels most notably rise Sunday
and Monday.
Numerous rivers are currently forecast to go into flood stage, some
from Moderate to near Major, starting with the Skokomish River in
Mason County late Saturday then eastward with many of the Cascade
Rivers by early next week. Excessive rainfall may also lead to
isolated residential and/or urban flooding.
WAC009-027-029-031-033-035-041-045-053-055-057-061-067-073-011845-
/O.NEW.KSEW.FA.A.0007.231203T0600Z-231207T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clallam-Grays Harbor-Island-Jefferson-King-Kitsap-Lewis-Mason-
Pierce-San Juan-Skagit-Snohomish-Thurston-Whatcom-
Including the cities of Chehalis, Lynnwood, Olympia,
Sedro-Woolley, Burlington, Everett, Shelton, Hoquiam, Bremerton,
Fords Prairie, Bellingham, Mount Vernon, Silverdale, Tumwater,
Lacey, Marysville, Freeland, Port Townsend, Anacortes, Sequim,
Edmonds, Langley, Aberdeen, Tacoma, Friday Harbor, and Seattle
935 PM PST Thu Nov 30 2023
...FLOOD WATCH IN EFFECT FROM SATURDAY EVENING THROUGH LATE
WEDNESDAY NIGHT...
* WHAT...Flooding caused by excessive rainfall is possible.
* WHERE...Portions of northwest and west central Washington,
including the following counties, in northwest Washington,
Clallam, Grays Harbor, Island, Jefferson, Kitsap, Mason, San Juan,
Skagit and Whatcom. In west central Washington, King, Lewis,
Pierce, Snohomish and Thurston.
* WHEN...From Saturday evening through late Wednesday night.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Flooding may occur in poor drainage and urban areas. Extensive
street flooding and flooding of creeks and rivers are possible.
* ADDITIONAL DETAILS...
- Excessive rainfall from a long-duration atmospheric river
event. Total rainfall forecast has increased with total
liquid accumulation through Wednesday of next week ranging
from 3 to 7 inches over the lowlands to upwards of 10 to 12
inches over the Cascades and 10 to 15 inches over the
Olympics.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
$$
Davis
Hydrologic Outlook
Hydrologic Outlook WAC009-027-029-031-033-035-041-045-053-055-057-061-067-073-011315- Hydrologic Outlook National Weather Service Seattle WA 405 PM PST Thu Nov 30 2023 ...THREAT OF RIVER AND URBAN FLOODING SUNDAY INTO THE MIDDLE OF NEXT WEEK ACROSS WESTERN WASHINGTON... An active weather pattern will continue with a series of frontal systems set to move across the Pacific Northwest through the middle of next week bringing multiple rounds of rain and mountain snow with increasing intensity through the weekend and into next week. Current snow levels around 2500 feet this afternoon will rise closer to 6000 to 7000 feet by Sunday and then closer to 8000 to 9000 feet Monday evening as persistent atmospheric river moisture advects into the Western Washington. Total rainfall forecast has increased with total liquid accumulation through Wednesday from these systems ranging from 3 to 7 inches over the lowlands to upwards of 10 to 12 inches over the Cascades and 10 to 15 inches over the Olympics. This will lead to rapid rises on rivers Sunday into early next week, especially when combined with melting snow as snow levels most notably rise Sunday and Monday. Numerous rivers are currently forecast to go into flood stage, some from Moderate to near Major, starting with the Skokomish River in Mason County late Saturday then eastward with many of the Cascade Rivers by early next week. River flooding may lead to isolated residential and/or urban flooding. Widespread inundation of farmland and road closures are possible near rivers. Please monitor the latest river forecasts from the National Weather Service for additional information. $$ Davis