...DRY AND BREEZY CONDITIONS WEDNESDAY...
.Breezy winds will develop through the Cascade gaps and into
portions of the Columbia Basin Wednesday and will coincide with
low relative humidities in the afternoon and evening.
The National Weather Service in Pendleton has issued a Fire
Weather Watch for wind and low relative humidity, which is in
effect from Wednesday afternoon through Wednesday evening.
* AFFECTED AREA...Fire Weather Zones 641 Lower Columbia Basin of
Oregon, 690 Kittitas Valley and 691 Lower Columbia Basin.
* WINDS...West 15 to 25 mph with gusts up to 35 mph.
* RELATIVE HUMIDITY...As low as 12 percent.
* IMPACTS...Breezy conditions combined with low RHs will result
in rapid fire spread and extreme fire behavior.
* WHAT...Hot conditions with afternoon temperatures up to 100
degrees and overnight lows in the 60s. This will pose a moderate
to major risk of heat-related illness.
* WHERE...Portions of northwest and west central Washington.
* WHEN...Until 10 PM PDT Tuesday.
* IMPACTS...Extreme heat will significantly increase the risk of
heat-related illnesses for much of the population, especially
those who are heat sensitive and those without effective cooling
or adequate hydration.
* ADDITIONAL DETAILS...Temperatures will gradually cool during the
middle and late portions of the week, but will remain well above
normal in the 80s for much of the lowlands.
* WHAT...Hot conditions with temperatures away from the immediate
coastline in the 80s degrees. This will pose a moderate risk of
heat-related illness.
* WHERE...Central Coast, North Coast, and Western Strait of Juan De
Fuca.
* WHEN...Until 11 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.
* ADDITIONAL DETAILS...Temperatures along the immediate coast will
be cooler, but this will not extend very far inland during the
daytime hours through Monday. Some relief is possible during the
overnight hours, but will be gradual and somewhat brief. Stronger
onshore flow will bring a return to closer to normal temperatures
for the coastal areas by midweek.
* 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 20 percent with moderate to
poor overnight recovery.
* TEMPERATURES...High temperatures 85 to 95 degrees with overnight
lows in the 60s.
* MID-LEVEL HAINES...6
* 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 during the day for the valleys. Highs will
be in the 90s except near 100 in Stehekin. Overnight lows will be
in 50s to low 60s.
* WHERE...Stehekin, Holden Village, and Stevens Pass.
* WHEN...Until 10 PM PDT Wednesday.
* IMPACTS...Hot temperatures may cause heat illnesses.
* WHAT...Dangerously hot conditions during the day with little
relief overnight. Highs 95 to 105 Monday, 100 to 108 Tuesday and
Wednesday. Overnight lows will be in 60s to mid 70s.
* WHERE...Portions of North and North Central Idaho and Central,
East Central, North Central, Northeast, and Southeast Washington.
* WHEN...Until 10 PM PDT Wednesday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat.
* WHAT...Dangerously hot conditions during the day for the valleys.
Highs 95 to 103. Overnight lows will be in 50s to low 60s.
* WHERE...Priest River, Orin-Rice Road, Wallace, Osburn, Pinehurst,
Flowery Trail Road, Dobson Pass, Lookout Pass, Chesaw Road,
Eastport, St. Maries, Highway 20 Wauconda Summit, Newport,
Fruitland, Tiger, Inchelium, Metaline Falls, Northport, Wauconda,
Colville, Kellogg, Kettle Falls, Ione, Fourth Of July Pass,
Bonners Ferry, Fernwood, Deer Park, Sherman Pass, Schweitzer
Mountain Road, Mullan, Springdale-Hunters Road, Sandpoint,
Metaline, Republic, Clark Fork, Boulder Creek Road, Chewelah, and
Athol.
* WHEN...Until 10 PM PDT Wednesday.
* IMPACTS...Hot temperatures may cause heat illnesses.
...HOT, DRY, UNSTABLE CONDITIONS ALONG THE EAST SLOPES OF THE
CASCADES MONDAY AND TUESDAY...
The National Weather Service in Spokane has issued a Red Flag
Warning for unstable thermal trough, which is in effect from noon
Monday to 11 PM PDT Tuesday.
* Affected Area: Fire Weather Zone 696 East Washington Central
Cascades (Zone 696), Fire Weather Zone 697 East Portion of North
Cascades National Park/Lake Chelan National Recreation Area
(Zone 697) and Fire Weather Zone 698 East Washington North
Cascades (Zone 698).
* Timing: 12 PM PDT Monday through 11 PM PDT Tuesday
* Relative Humidities: Minimum values 8 to 16 percent in the
valleys and 14 to 23 percent over the higher terrain. Poor
overnight humidity recovery.
* Temperatures: High temperatures 100 to 108 in the valleys, 80s
and 90s in the mountains.
* Impacts: Hot, dry, and unstable conditions will lead to the
potential for rapid fire growth on any new or existing fires.
* WHAT...Dangerously hot conditions with temperatures between 100
and 105 degrees expected. Overnight temperatures will be slow to
cool off each evening, only falling below 70 degrees for a short
period each night, if at all depending on your location. The warm
nighttime temperatures will limit chances to recover from the
heat, exacerbating the risk of heat-related illness during this
prolonged heat wave.
* WHERE...Portions of northwest and west central Oregon and
southwest Washington.
* WHEN...Until 10 PM PDT Tuesday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.
* ADDITIONAL DETAILS...The most intense portion of this heat wave
has not yet occurred. The hottest temperatures are expected Monday
and Tuesday, with Monday night being the warmest night.
* WHAT...Afternoon temperatures in the upper 80s to middle 90s
expected. A few spots could reach close to 100 degrees, mainly the
lower valleys located towards the Willamette Valley.
* WHERE...In Oregon, North Oregon Cascades, Cascades of Lane County,
and Cascades of Marion and Linn Counties. In Washington, South
Washington Cascades.
* WHEN...Until 10 PM PDT Tuesday.
* IMPACTS...Hot temperatures may cause heat illnesses.
* 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 20 percent with moderate to
poor overnight recovery.
* TEMPERATURES...High temperatures 85 to 95 degrees with overnight
lows in the 60s.
* MID-LEVEL HAINES...6
* 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...Dangerously hot conditions with limited overnight relief.
Afternoon high temperatures of 95 to 105 degrees. Overnight low
temperatures in the mid-50s to lower 70s.
* WHERE...Lower Slopes of the Eastern Washington Cascades Crest.
* WHEN...Until 10 PM PDT Wednesday.
* IMPACTS...Heat-related illnesses increase significantly during
extreme heat events.
* ADDITIONAL DETAILS...Hottest temperatures during this
long-duration heatwave are expected Tuesday.
* WHAT...Hot temperatures with modest overnight relief. Afternoon
high temperatures of 90 to 105 degrees, highest in lower valleys
and canyons. Overnight low temperatures in the low 50s to upper
60s, lowest in high valleys.
* WHERE...Blue Mountains of Oregon and Washington, Grande Ronde
Valley, and Wallowa County.
* WHEN...From noon Monday to 10 PM PDT Wednesday.
* IMPACTS...Hot temperatures may cause heat-related illnesses.
* ADDITIONAL DETAILS...Hottest temperatures during this
long-duration heatwave are expected Tuesday and Wednesday.
* WHAT...Dangerously hot conditions with limited overnight relief.
Afternoon high temperatures of 95 to 110 degrees. Overnight low
temperatures in the upper 50s to mid-70s.
* WHERE...Portions of north central and northeast Oregon and
central, south central, and southeast Washington.
* WHEN...Until 10 PM PDT Wednesday.
* IMPACTS...Heat-related illnesses increase significantly during
extreme heat events.
* ADDITIONAL DETAILS...Hottest temperatures during this
long-duration heatwave are expected Tuesday.
* WHAT...Hot temperatures with modest overnight relief. Afternoon
high temperatures of 90 to 105 degrees, highest along the East
Slopes of the Oregon Cascades. Overnight low temperatures in the
low 50s to upper 60s, lowest in valleys.
* WHERE...In Oregon, East Slopes of the Oregon Cascades. In
Washington, Upper Slopes of the Eastern Washington Cascades Crest.
* WHEN...From noon Monday to 10 PM PDT Tuesday.
* IMPACTS...Hot temperatures may cause heat-related illnesses.
* ADDITIONAL DETAILS...Hottest temperatures during this
long-duration heatwave are expected Tuesday.
* WHAT...Hot conditions with afternoon temperatures mostly in the
90s and overnight lows in the 60s. This will pose a moderate to
major risk of heat-related illness.
* WHERE...Portions of northwest and west central Washington.
* WHEN...Until 10 PM PDT Tuesday.
* IMPACTS...This level of heat will significantly increase the risk
of heat-related illnesses for much of the population, especially
those who are heat sensitive and those without effective cooling
or adequate hydration.
* ADDITIONAL DETAILS...Temperatures will gradually cool during the
middle and late portions of the week, but they will remain well
above normal.
* WHAT...Hot conditions with temperatures away from the immediate
coastline in the 80s degrees. This will pose a moderate risk of
heat-related illness.
* WHERE...Central Coast, North Coast, and Western Strait of Juan De
Fuca.
* WHEN...Until 11 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.
* ADDITIONAL DETAILS...Temperatures along the immediate coast will
be cooler, but this will not extend very far inland during the
daytime hours through Monday. Some relief is possible during the
overnight hours, but will be gradual and somewhat brief. Stronger
onshore flow will bring a return to closer to normal temperatures
by midweek.
* WHAT...Temperatures up to 96.
* WHERE...In Oregon, North Oregon Cascades, Cascades of Lane County,
and Cascades of Marion and Linn Counties. In Washington, South
Washington Cascades.
* WHEN...Until 10 PM PDT Tuesday.
* IMPACTS...Hot temperatures may cause heat illnesses.
* WHAT...Dangerously hot conditions with temperatures 100 to 105
expected. Overnight temperatures will be slow to cool off each
evening, only falling below 70 degrees for a short period each
night, if at all. The warm nighttime temperatures will limit
chances to recover from the heat, exacerbating the risk of
heat-related illness in this prolonged heat wave.
* WHERE...Portions of northwest and west central Oregon and
southwest Washington.
* WHEN...Until 10 PM PDT Tuesday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.
* ADDITIONAL DETAILS...The most intense portion of this heat wave
has not yet occurred. The hottest temperatures are expected Monday
and Tuesday, with Monday night being the warmest night.
* WHAT...Dangerously hot conditions with little overnight relief.
Afternoon high temperatures potentially as high as 105 degrees.
Overnight and morning lows in the 60s.
* WHERE...Lower Slopes of the Eastern Washington Cascades Crest.
* WHEN...Until 10 PM PDT Wednesday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.
* ADDITIONAL DETAILS...Major to locally Extreme HeatRisk (risk of
heat-related impacts) is anticipated through the duration of the
event.
