...HOT, DRY, AND UNSTABLE CONDITIONS FOR MONDAY AND TUESDAY...
.A strong ridge of high pressure will bring a period of hot and
dry conditions to the central and northern Cascades of Washington
this weekend. The ridge will shift east of the Cascades early
next week with the atmosphere becoming more unstable at that
time. Increased instability with hot and dry conditions will
bring the potential for critical fire weather conditions.
* Affected Area: East Washington Central Cascades (Zone 696),
East Portion of North Cascades National Park/Lake Chelan
National Recreation Area (Zone 697), East Washington North
Cascades (Zone 698) and Methow Valley (Zone 704).
* Winds: East-southeast 3 to 7 mph in the afternoon becoming west
5 to 10 mph in the evening.
* Timing: Afternoon and evening for both Monday and Tuesday.
* Relative Humidities: Below 4,000 feet: 13 to 20 percent. Above
4,000 feet: 20 to 30 percent.
* Temperatures: Below 4,000 feet: 90 to 102 degrees. Above 4,000
feet: 75 to 90 degrees.
* Impacts: Hot, dry, and unstable conditions may lead to rapid
fire growth on any new or existing fires.
* AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North
Cascades Generally above 1500 Feet and Fire Weather Zone 659
West Slopes of the Central Cascades Generally above 1500 Feet.
* RELATIVE HUMIDITY...As low as 15 to 25 percent.
* TEMPERATURES...Up to 90 to 100 degrees.
* STABILITY...Unstable conditions can be expected.
* IMPACTS...A dry and unstable air mass with warm temperatures
can contribute to active fire behavior. In western Washington,
significant growth on existing fires takes place under such
conditions. If a fire were to begin, air quality may diminish
in the surrounding area.
* AFFECTED AREA...Fire Weather Zone 661 East Portion of the
Olympic Mountains.
* RELATIVE HUMIDITY...As low as 20 to 25 percent.
* TEMPERATURES...Up to 90 to 95 degrees.
* STABILITY...Unstable conditions can be expected.
* IMPACTS...A dry and unstable air mass with warm temperatures
can contribute to active fire behavior. In western Washington,
significant growth on existing fires takes place under such
conditions. If a fire were to begin, air quality may diminish
in the surrounding area.
* AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North
Cascades Generally above 1500 Feet and Fire Weather Zone 659
West Slopes of the Central Cascades Generally above 1500 Feet.
* RELATIVE HUMIDITY...As low as 15 to 25 percent.
* TEMPERATURES...Up to 90 to 100 degrees.
* STABILITY...Unstable conditions can be expected.
* IMPACTS...A dry and unstable air mass with warm temperatures
can contribute to active fire behavior. In western Washington,
significant growth on existing fires takes place under such
conditions. If a fire were to begin, air quality may diminish
in the surrounding area.
* WHAT...Hot conditions with high temperatures ranging from the mid
80s to 90s expected and low temperatures mostly in the 60s. This
will pose a moderate risk of heat-related illness.
* WHERE...Portions of northwest and west central Washington.
* WHEN...Until 5 AM PDT Tuesday.
* IMPACTS...Heat will significantly 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 ranging from the
upper 80s to upper 90s and low temperatures mostly in the 60s.
This will pose a major risk of heat-related illness.
* WHERE...Foothills and Valleys of the North Cascades, Foothills and
Valleys of Central King County, Foothills and Valleys of Pierce
and Southern King Counties, Foothills and Valleys of Snohomish and
Northern King Counties, and Foothills and Valleys of Thurston and
Lewis Counties.
* WHEN...Until 5 AM PDT Tuesday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.
* WHAT...Hot conditions with high temperatures ranging from the mid
80s to 90s expected and low temperatures mostly in the 60s. This
will pose a moderate risk of heat-related illness.
* WHERE...Lake Crescent Area Including US 101.
* WHEN...Until 5 AM PDT Tuesday.
* IMPACTS...Heat will significantly 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 ranging from the
upper 80s to mid 90s and low temperatures in the mid 60s. This
will pose a major risk of heat-related illness.
* WHERE...City of Seattle, Eastside, and Lowlands of Pierce and
Southern King Counties.
* WHEN...Until 5 AM PDT Tuesday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.
* WHAT...Dangerously hot conditions with high temperatures up to
93-98F and overnight low temperatures of 60-68F possible.
* WHERE...South Washington Cascades and the Northern and Central
Cascades of Oregon, North and Central Coast Range Valleys of
Oregon, and Willapa and Wahkiakum Lowlands.
* WHEN...Until 5 AM PDT Tuesday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events, especially for those spending time outdoors
or without access to adequate cooling.
* ADDITIONAL DETAILS...Saturday will be the hottest day. Overnight
lows as warm as the lower 70s are possible on the mid slopes of
the Cascades.
* WHAT...Dangerously hot conditions with high temperatures up to
93-98F and overnight low temperatures of 60-68F possible.
* WHERE...North and Central Coast Range Mountains of Oregon, and
Willapa Hills.
* WHEN...Until 5 AM PDT Monday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events, especially for those spending time outdoors
or without access to adequate cooling.
* ADDITIONAL DETAILS...Saturday will be the hottest day.
* WHAT...Dangerously hot conditions with high temperatures of
97-103F and overnight low temperatures of 60-70F expected, except
low to mid 70s in the Columbia River Gorge.
* WHERE...Greater Portland/Vancouver Metro, Western and Central
Columbia River Gorge, the Corbett area and the Hood River Valley,
Central and Southern Willamette Valley, Foothills of the Northern
and Central Oregon Cascades, Lower Columbia River and Cowlitz
River Valleys, and South Washington Cascade Foothills.
* WHEN...Until 11 PM PDT Tuesday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events, especially for those spending time outdoors
or without access to adequate cooling.
* ADDITIONAL DETAILS...Saturday and Sunday will be the hottest days.
The warmest overnight lows are expected to occur in the Columbia
River Gorge and in urban areas from Salem northward.
* AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North
Cascades Generally above 1500 Feet and Fire Weather Zone 659
West Slopes of the Central Cascades Generally above 1500 Feet.
* RELATIVE HUMIDITY...As low as 15 to 25 percent.
* TEMPERATURES...Up to 90 to 100 degrees.
* STABILITY...Unstable conditions can be expected.
* IMPACTS...A dry and unstable air mass with warm temperatures can
contribute to active fire behavior. In western Washington,
significant growth on existing fires takes place under such
conditions. If a fire were to begin, air quality may diminish in
the surrounding area.
* AFFECTED AREA...Fire Weather Zone 661 East Portion of the
Olympic Mountains.
* RELATIVE HUMIDITY...As low as 20 to 25 percent.
* TEMPERATURES...Up to 90 degrees
* STABILITY...Unstable conditions can be expected.
* IMPACTS...A dry and unstable air mass with warm temperatures can
contribute to active fire behavior. In western Washington,
significant growth on existing fires takes place under such
conditions. If a fire were to begin, air quality may diminish in
the surrounding area.
* AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North
Cascades Generally above 1500 Feet and Fire Weather Zone 659
West Slopes of the Central Cascades Generally above 1500 Feet.
* RELATIVE HUMIDITY...As low as 15 to 25 percent.
* TEMPERATURES...Up to 90 to 100 degrees.
* STABILITY...Unstable conditions can be expected.
* IMPACTS...A dry and unstable air mass with warm temperatures can
contribute to active fire behavior. In western Washington,
significant growth on existing fires takes place under such
conditions. If a fire were to begin, air quality may diminish in
the surrounding area.
* WHAT...Hot conditions with high temperatures ranging from the
upper 80s to upper 90s and low temperatures mostly in the 60s.
This will pose a major risk of heat-related illness.
* WHERE...Foothills and Valleys of the North Cascades, Foothills and
Valleys of Central King County, Foothills and Valleys of Pierce
and Southern King Counties, Foothills and Valleys of Snohomish and
Northern King Counties, and Foothills and Valleys of Thurston and
Lewis Counties.
* WHEN...Until 5 AM PDT Tuesday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.
* WHAT...Hot conditions with high temperatures ranging from the mid
80s to 90s expected and low temperatures mostly in the 60s. This
will pose a moderate risk of heat-related illness.
* WHERE...Portions of northwest and west central Washington.
* WHEN...Until 5 AM PDT Tuesday.
* IMPACTS...Heat will significantly 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 ranging from the
upper 80s to mid 90s and low temperatures in the mid 60s. This
will pose a major risk of heat-related illness.
* WHERE...City of Seattle, Eastside, and Lowlands of Pierce and
Southern King Counties.
* WHEN...Until 5 AM PDT Tuesday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.
* WHAT...Hot conditions with high temperatures ranging from the mid
80s to 90s expected and low temperatures mostly in the 60s. This
will pose a moderate risk of heat-related illness.
* WHERE...Lake Crescent Area Including US 101.
* WHEN...Until 5 AM PDT Tuesday.
* IMPACTS...Heat will significantly increase the risk of
heat-related illnesses for those who are sensitive to heat,
especially those without effective cooling or adequate hydration.
Breezy easterly winds are expected through Friday evening for the
eastern Portland/Vancouver metro and through Friday night for the
Columbia River Gorge and adjacent Cascade ridgetops. Winds will
be strongest on exposed ridgetops where wind gusts will most
likely peak between 25-35 mph. Elsewhere, expect wind gusts
between 15-20 mph, except up to 30 mph in the western Columbia
River Gorge. The breezy east winds will occur simultaneously with
low relative humidity values of 20-30% or less, resulting in
elevated fire weather conditions. Due to recent rains in the
area, larger fuels (such as trees and shrubs) are not dry enough
to cause rapid fire spread, but the hot weather will allow fine
fuels (such as grasses) to dry out quickly, allowing for potential
rapid spread. Use extra caution with potential ignition sources,
especially in grassy areas. Outdoor burning is not recommended.
* WHAT...Dangerously hot conditions with high temperatures up to
93-98F and overnight low temperatures of 60-68F possible.
* WHERE...South Washington Cascades and the Northern and Central
Cascades of Oregon, North and Central Coast Range Valleys of
Oregon, and Willapa and Wahkiakum Lowlands.
* WHEN...Until 5 AM PDT Tuesday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events, especially for those spending time outdoors
or without access to adequate cooling.
* ADDITIONAL DETAILS...Friday and Saturday will be the hottest days.
Overnight lows as warm as the lower 70s are possible on the mid
slopes of the Cascades.
