Hazard Report Provided By forecast.weather.gov

Hydrologic Outlook
ORZ101>128-WAZ201>211-231215-

Hydrologic Outlook
National Weather Service Portland OR
257 AM PST Sat Feb 22 2025

...PERIOD OF WET WEATHER WILL LEAD TO RISES ON RIVERS AND INCREASE
CHANCES FOR URBAN FLOODING...

An series of frontal systems will bring heavy rainfall to northwest
Oregon and southwest Washington through Monday. Heavier rain will
begin with the arrival of a front this afternoon, and intensify
tonight into Sunday. After a brief lull in precipitation late Sunday,
another strong system will bring additional moderate to heavy
rainfall on Monday. This will lead to rises on rivers and creeks,
especially for rivers draining the Willapa Hills and Oregon Coast
Range through Monday. Main stem rivers may be delayed to respond, and
flooding may occur beyond this time frame.

There is around a 20-30% chance of the Wilson River, the Grays River,
and other localized quick responding coastal rivers of reaching minor
flood stage by late Sunday or early Monday. More widespread river
flooding is not expected, but increases in forecast precipitation
amounts could lead to additional rises on area rivers if heavier
rainfall stalls over the area for a longer period of time.

Heavy rainfall along the Cascades combined with snowmelt will lead to
an enhanced risk of landslides.

Heavy rainfall may also lead to ponding of water and localized urban
flooding, especially in low-lying areas or other poor-drainage areas.
Heavy rainfall will also increase the potential for landslides in
areas of steep terrain. The probability of debris flows is currently
low as rainfall rates are not expected to meet thresholds over areas
that have been burned by wildfires over the past few years.

Shifts in the forecast storm track can change the outlook and
probabilities for river flooding, so be sure to monitor
weather.gov/portland for the latest weather updates, as well as any
watches, warnings, or advisories that may be issued. To view the
latest river forecasts, visit water.noaa.gov/wfo/pqr.

$$

CB

ORZ126-240200-

URGENT - IMMEDIATE BROADCAST REQUESTED
Avalanche Warning
Northwest Avalanche Center
Relayed by National Weather Service Portland OR
507 PM PST Sat Feb 22 2025

The following message is transmitted at the request of the Northwest
Avalanche Center.

...The Northwest Avalanche Center in Seattle has issued an Avalanche
Warning...

* WHAT...Very dangerous conditions are expected overnight and
  continue into Sunday as heavy wet snow and rain overload a dry and
  weak snowpack. Very large natural avalanches may occur and could
  descend into lower elevation forested areas.

* WHERE...Areas near Mt Hood, Stevens Pass, Snoqualmie Pass, and the
  west slopes of the Cascades from I-90 to the Columbia River,
  including Crystal Mountain, Mt Rainier, White Pass, Mt Saint
  Helens, and Mt Adams. As well as the East slopes of the Cascades
  from the Canadian border to Lake Chelan, including Washington
  Pass, Methow Valley, and Twisp areas.

* WHEN...In effect from Sat 18:00 PST to Sun 18:00 PST.

* IMPACTS...Very large natural avalanches are expected. These will
  be more than enough to bury, injure, or kill backcountry travelers.

* PRECAUTIONARY / PREPAREDNESS ACTIONS...Avoid all areas where
  avalanches can start, run, or stop. This includes openings in the
  forest well below large steep alpine slopes.

Consult https://www.nwac.us/ or www.avalanche.org for more detailed
information.

Similar avalanche danger may exist at locations outside the coverage
area of this or any avalanche center.

$$

Flood Watch
National Weather Service Portland OR
232 PM PST Sat Feb 22 2025

ORZ101>128-WAZ201>211-231515-
/O.CON.KPQR.FA.A.0001.250223T1200Z-250226T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clatsop County Coast-Tillamook County Coast-Central Coast of
Oregon-North Oregon Coast Range Lowlands-Central Oregon Coast
Range Lowlands-North Oregon Coast Range-Central Oregon Coast
Range-Lower Columbia River-Tualatin Valley-Portland West Hills
and Chehalem Mountain-Inner Portland Metro-East Portland Metro-
Outer Southeast Portland Metro-West Central Willamette Valley-
East Central Willamette Valley-Benton County Lowlands-Linn County
Lowlands-Lane County Lowlands-West Columbia River Gorge of Oregon
above 500 ft-West Columbia River Gorge I-84 Corridor-Upper Hood
River Valley-Central Columbia River Gorge I-84 Corridor-Clackamas
County Cascade Foothills-Cascade Foothills of Marion and Linn
Counties-Lane County Cascade Foothills-North Oregon Cascades-
Cascades of Marion and Linn Counties-Cascades of Lane County-
South Washington Coast-Willapa and Wahkiakum Lowlands-Willapa
Hills-Cowlitz County Lowlands-North Clark County Lowlands-Inner
Vancouver Metro-East Clark County Lowlands-South Washington
Cascade Foothills-West Columbia River Gorge SR 14 Corridor-
Central Columbia River Gorge SR 14 Corridor-South Washington
Cascades-
Including the cities of Lebanon, McMinnville, Newberg, McKenzie
Bridge, Lake Oswego, Oakridge, Portland, Clatskanie, Skyline
Drive, Underwood, Cherryville, Rosburg, Rhododendron, Tokeland,
Mary`s Peak, Battle Ground, Mt. St. Helens, Salmon Creek,
Willamette Pass, Woodburn, Larch Mountain, Evergreen, Lincoln
City, Cathlamet, Alma, Ridgefield, Rooster Rock, Seaside, Sunset
Summit, Toutle, Tigard, Vernonia, Odell, Tombstone Summit,
Newport, Sellwood, Lost Lake, Springfield, Troutdale, Kalama,
Jewell, Cascade Locks, Monmouth, Cottage Grove, Carson, Silver
Falls, Chehalem Mountain, Brownsville, Horton, Rockaway Beach,
Government Camp, Raymond, Castle Rock, Corbett, Hockinson,
Rainier, Corvallis, North Bonneville, Wyeth, Monroe, Manzanita,
Gresham, Vida, La Center, McKenzie Pass, Bonneville, Mill City,
Grand Ronde, Warrenton, Santiam Pass, Willapa, Bennett Pass,
Wilsonville, Amboy, Forest Grove, Molalla, Albany, Hood River,
Detroit, Hoskins, Pacific City, Brightwood, Cape Horn, Vancouver,
Tillamook, Multnomah Falls, Harrisburg, Waldo Lake, Camas, Sylvan
Hill, Stevenson, Eugene, Sheridan, Lake Merwin, Parkdale,
Welches, Eagle Creek, Astoria, Dallas, Mapleton, Glenwood,
Stayton, Kelso, Woodland, Valsetz, Happy Valley, Washougal,
Timothy Lake, Long Beach, Scappoose, Indian Heaven Wilderness,
Cannon Beach, Florence, Wilson River Summit, Lebam, Hillsboro,
Salem, Yacolt, Neskowin, Santiam Junction, St. Helens, Beacon
Rock SP, Silverton, Creswell, Junction City, Sandy, Grand Ronde
Indian Reservation, Knappa, Estacada, Longview, Necanicum,
Rockcreek, Keizer, Oregon City, Fairview, Sherwood, Ocean Park,
Breitenbush Springs, Philomath, Waldport, Alsea, Naselle,
Brooklyn, Brush Prairie, and Boring
232 PM PST Sat Feb 22 2025

...FLOOD WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH LATE
TUESDAY NIGHT...

* WHAT...Flooding caused by excessive rainfall continues to be
  possible.

* WHERE...Portions of northwest Oregon and southwest Washington,
  including the following counties, in Oregon, Benton, Clackamas,
  Clatsop, Columbia, Cowlitz, Hood River, Lane, Lincoln, Linn,
  Marion, Multnomah, Polk, Tillamook, Washington, and Yamhill. In
  Washington, Clark, Pacific, Skamania, and Wahkiakum Lowlands.

* WHEN...From late tonight through late Tuesday night.

* IMPACTS...Excessive runoff may result in flooding of rivers,
  creeks, streams, and other low-lying and flood-prone locations,
  especially for rivers draining the Willapa Hills and Oregon Coast
  Range. Flooding may occur in poor drainage and urban areas.
  Landslides are possible through this period, especially over the
  Cascades due to heavy rainfall above 7,000 feet combined with
  snowmelt. There is low probability for debris flows as rainfall
  rates are not expected to meet thresholds over recently burned
  areas.

* ADDITIONAL DETAILS...
  - An atmospheric river and series of frontal systems will
    produce periods of heavy rainfall over northwest Oregon and
    Southwest Washington through Monday. The heaviest rain will
    be over the coast, Coast Range, Willapa Hills, and Cascades
    where rain totals from Saturday through Monday night will
    range from 3 to 6 inches, with locally higher amounts
    possible. Snow levels will rise to above 7,000 feet on
    Sunday, and snow melt due to rain falling on the Cascade snow
    pack could cause additional flooding concerns for drainages
    from the Cascades along with enhanced risk of landslides.
  - 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.

&&

$$

03

Hazard Report Provided By forecast.weather.gov