* WHAT...Temperatures between 33 and 35 will result in frost
formation.
* WHERE...Hood Canal Area, East Puget Sound Lowlands, Lower Chehalis
Valley Area, and Southwest Interior.
* WHEN...Until 8 AM PDT this morning.
* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.
* WHAT...Very cold wind chills. Wind chills as low as 15 below
zero.
* WHERE...East Puget Sound Lowlands from Snohomish County to
Pierce County, including Arlington, Gold Bar, Duvall,
Snoqualmie, Buckley, and Eatonville.
* WHEN...Until 6 AM PST Sunday.
* IMPACTS...The cold wind chills could result in hypothermia if
precautions are not taken.
* WHAT...Near gaps in the terrain...east winds 25 to 40 mph with
gusts to 50 mph increasing to 35 to 50 mph with gusts up to 65
mph this afternoon.
* WHERE...East Puget Sound Lowlands.
* WHEN...Until 10 PM PST this evening.
* IMPACTS...Damaging winds will blow down trees and power lines.
Power outages are expected. Travel will be difficult, especially
for high profile vehicles.
...AFTER A RELATIVELY MILD WINTER THUS FAR, THE POTENTIAL EXISTS FOR
THE COLDEST TEMPERATURES OF THE SEASON JANUARY 12-15, 2024...
An active weather pattern will continue to impact the region
through at least the next week as a series of strong frontal
systems bring additional rounds of lowland rain and mountain snow
to Western Washington. Heavy snow will slowly decrease in
intensity through the Olympics and Cascades this morning as snow
transitions into snow showers. After a brief break Sunday into
Sunday night, prolonged heavy snow is becoming increasingly likely
Monday through Thursday as a series of systems move across the
Pacific Northwest. Current forecast snowfall totals of 2 to 5
feet over 2000 feet will be possible through this timeframe.
Currently, there is a 50-80% chance for 48-hour snowfall totals in
excess of 30 inches over the Cascades above 2500 feet, including
Stevens and Snoqualmie passes. In addition, westerly winds will
increase during this time, with gusts to around 40 mph and even
higher over the high Cascades Tuesday with a 65% chance for peak
wind gusts over 50 mph. Anyone with travel plans over the Cascade
passes and/or through the rest of the Cascades and Olympic
mountains will need to be well prepared for dangerous travel
conditions due to a combination of heavy and blowing snow.
The potential also exists for much colder temperatures across
Western Washington by the second half of the week as a much colder
airmass settles into the Pacific Northwest. Uncertainty still
exists in how cold this airmass will be with disagreement in how
far south high pressure penetrates out of southern Canada.
Currently, there is a 50% chance for the low temperatures to drop
below 20F Thursday night through Saturday night across the
lowlands. After a relatively mild start to the winter season,
these temperatures will come as a drastic change to many. While
the details remain unclear, it is worth monitoring the forecast
for potential changes and additional information over the next
several days.
For more information about current conditions and forecasts,
visit www.weather.gov/seattle.
Breezy north winds will continue on Tuesday alongside afternoon
relative humidity values in the 20 to 30 percent range during the
afternoon and into the evening hours. Conditions will also become
unstable on Tuesday as mid- level Haines values approach or reach
6. These conditions will combine to produce a favorable
environment for fire starts and fire spreads.
* WHAT...Hot conditions with temperatures in the mid 80s to low
90s expected. This will pose a moderate, to localized major, risk
of heat-related illness.
* WHERE...Portions of northwest and west central Washington.
* WHEN...From 2 PM Saturday to 8 PM PDT Monday.
* IMPACTS...Hot conditions will increase the risk of heat-related
illnesses for those who are sensitive to heat, especially those
without effective cooling or adequate hydration.
* WHAT...Hot conditions with high temperatures in the mid 80s to
low 90s. This will pose a moderate, to localized major, risk of
heat-related illness.
* WHERE...Portions of northwest and west central Washington.
* WHEN...From 2 PM today to 8 PM PDT Monday.
* IMPACTS...Hot conditions will increase the risk of heat-
related illnesses for those who are sensitive to heat,
especially those without effective cooling or adequate
hydration.
* WHAT...Hot conditions with high temperatures in the mid 80s to
low 90s. This will pose a moderate, to localized major, risk of
heat-related illness.
* WHERE...Portions of northwest and west central Washington.
* WHEN...Until 8 PM PDT Monday.
* IMPACTS...Hot conditions will increase the risk of heat- related
illnesses for those who are sensitive to heat, especially those
without effective cooling or adequate hydration.
* WHAT...Hot conditions with high temperatures in the mid 80s to
low 90s. This will pose a moderate risk of heat-related
illness.
* WHERE...Portions of northwest and west central Washington.
* WHEN...Until 8 PM PDT Monday.
* IMPACTS...Hot conditions will increase the risk of heat-related
illnesses for those who are sensitive to heat, especially those
without effective cooling or adequate hydration.
* WHAT...Hot conditions with high temperatures in the mid 80s to
low 90s. This will pose a moderate risk of heat-related
illness.
* WHERE...Portions of northwest and west central Washington.
* WHEN...Until 8 PM PDT Monday.
* IMPACTS...Hot conditions will increase the risk of heat-
related illnesses for those who are sensitive to heat,
especially those without effective cooling or adequate
hydration.