* 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...Dangerously hot conditions with limited overnight relief.
Afternoon high temperatures of 95 to 110 degrees. Overnight low
temperatures in the mid-50s to lower 70s.
* WHERE...Central Oregon and John Day Basin.
* 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...High temperatures of 100 to 110 with low temperatures in
the mid to upper 60s expected.
* WHERE...Central Douglas County and Eastern Douglas County
Foothills. This includes the cities of Roseburg, Toketee Falls,
and Sutherlin.
* WHEN...Until 9 PM PDT Tuesday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events, particularly for those working or
participating in outdoor activities. Area rivers will be cold and
can cause shock to swimmers.
* ADDITIONAL DETAILS...This will be a long-duration heatwave with
hot temperatures through Tuesday.
* WHAT...High temperatures of 95 to 102 degrees with lows in the mid
to upper 50s expected.
* WHERE...In California, Modoc County and eastern Siskiyou County.
This includes the cities and communities of Macdoel, Tulelake,
Pondosa, Bray, Tennant, Dorris, Tionesta, Alturas, and Adin. In
Oregon, Klamath and Lake counties. This includes the cities of
Klamath Falls, Chemult, Summer Lake, Chiloquin, Malin, Keno,
Sprague River, and Lakeview.
* WHEN...Until 9 PM PDT Tuesday.
* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses. Area rivers will be cold and can cause shock to
swimmers.
* ADDITIONAL DETAILS...This will be a long-duration heatwave with
hot temperatures through Tuesday.
* WHAT...Dangerously hot conditions with high temperatures 105 to
115, and low temperatures in the mid 60s to lower 70s.
* WHERE...In California, western and central Siskiyou County. This
includes the cities of Yreka, Weed, Etna, Happy Camp, Mt Shasta
City, and Dunsmuir. In Oregon, Josephine and Jackson counties and
eastern Curry County. This includes the entire Rogue Valley and
the cities of Medford, Grants Pass, Cave Junction, and Butte Falls.
* WHEN...Until 9 PM PDT Tuesday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Area rivers will be cold and can cause shock
to swimmers.
* ADDITIONAL DETAILS...This will be a long-duration heatwave with
hot temperatures through 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...For the Excessive Heat Warning, dangerously hot
conditions with temperatures 105 to 110 expected. For the
Excessive Heat Watch, dangerously hot conditions with
temperatures up to 106 possible.
* WHERE...Oregon Lower Treasure Valley.
* WHEN...For the Excessive Heat Warning, from 2 PM Monday to
midnight MDT Thursday night. For the Excessive Heat Watch,
from late Thursday night through Sunday evening.
* IMPACTS...Extreme heat will significantly increase the
potential for heat related illnesses, particularly for those
working or participating in outdoor activities.
* WHAT...For the Excessive Heat Warning, dangerously hot
conditions with temperatures 105-110 expected. For the Excessive
Heat Watch, dangerously hot conditions with temperatures up to
106 possible.
* WHERE...Portions of southwest and west central Idaho and
southeast Oregon.
* WHEN...For the Excessive Heat Warning, from 11 AM MDT /10 AM
PDT/ Tuesday to midnight MDT /11 PM PDT/ Thursday night. For
the Excessive Heat Watch, from late Thursday night through
Sunday evening.
* IMPACTS...Extreme heat will significantly increase the
potential for heat related illnesses, particularly for those
working or participating in outdoor activities.
* WHAT...For the Heat Advisory, temperatures up to 103 expected.
For the Excessive Heat Watch, dangerously hot conditions with
temperatures up to 102 possible.
* WHERE...Harney County.
* WHEN...For the Heat Advisory, from 10 AM Tuesday to 11 PM PDT
Thursday. For the Excessive Heat Watch, from Thursday evening
through Sunday evening.
* IMPACTS...Extreme heat will significantly increase the
potential for heat related illnesses, particularly for those
working or participating in outdoor activities.
* WHAT...For the Excessive Heat Warning, dangerously hot
conditions with temperatures 105 to 110, hottest in the lower
elevations near the Snake River. For the Excessive Heat Watch,
dangerously hot conditions with temperatures up to 100 possible.
* WHERE...Baker County.
* WHEN...For the Excessive Heat Warning, from 10 AM Tuesday to
11 PM PDT Wednesday. For the Excessive Heat Watch, from
Thursday evening through Sunday evening.
* IMPACTS...Extreme heat will significantly increase the
potential for heat related illnesses, particularly for those
working or participating in outdoor activities.
* WHAT...For the Excessive Heat Warning, dangerously hot
conditions with temperatures 105-110 expected. For the Excessive
Heat Watch, dangerously hot conditions with temperatures up to
106 possible.
* WHERE...Portions of southwest and west central Idaho and
southeast Oregon.
* WHEN...For the Excessive Heat Warning, from 11 AM MDT /10 AM
PDT/ Tuesday to midnight MDT /11 PM PDT/ Thursday night. For
the Excessive Heat Watch, from late Thursday night through
Sunday evening.
* IMPACTS...Extreme heat will significantly increase the
potential for heat related illnesses, particularly for those
working or participating in outdoor activities.
* WHAT...For the Heat Advisory, temperatures up to 103 expected.
For the Excessive Heat Watch, dangerously hot conditions with
temperatures up to 102 possible.
* WHERE...Harney County.
* WHEN...For the Heat Advisory, from 10 AM Tuesday to 11 PM PDT
Thursday. For the Excessive Heat Watch, from Thursday evening
through Sunday evening.
* IMPACTS...Extreme heat will significantly increase the
potential for heat related illnesses, particularly for those
working or participating in outdoor activities.
* WHAT...For the Excessive Heat Warning, dangerously hot
conditions with temperatures 105 to 110 expected. For the
Excessive Heat Watch, dangerously hot conditions with
temperatures up to 106 possible.
* WHERE...Oregon Lower Treasure Valley.
* WHEN...For the Excessive Heat Warning, from 2 PM Monday to
midnight MDT Thursday night. For the Excessive Heat Watch,
from late Thursday night through Sunday evening.
* IMPACTS...Extreme heat will significantly increase the
potential for heat related illnesses, particularly for those
working or participating in outdoor activities.
* WHAT...For the Excessive Heat Warning, dangerously hot
conditions with temperatures 105 to 110, hottest in the lower
elevations near the Snake River. For the Excessive Heat Watch,
dangerously hot conditions with temperatures up to 100 possible.
* WHERE...Baker County.
* WHEN...For the Excessive Heat Warning, from 10 AM Tuesday to
11 PM PDT Wednesday. For the Excessive Heat Watch, from
Thursday evening through Sunday evening.
* IMPACTS...Extreme heat will significantly increase the
potential for heat related illnesses, particularly for those
working or participating in outdoor activities.
* IMPACTS...Any fires that develop will likely spread rapidly.
* AFFECTED AREA...Fire weather zones 280...616, 617, 620, 621,
622, 623 & 624. This includes much of western Siskiyou
County, Douglas County, northern and central Josephine
County, Jackson County, most of Klamath County and western
Lake County.
* WIND...Northwest 10 to 15 mph with gusts as high as 25 mph.
* HUMIDITY...7 to 15 percent.
* DETAILED URL...View the hazard area in detail at
https://www.wrh.noaa.gov/map/?wfo=mfr