An upper level low will move up from the south along the
California coast Saturday, and will tap into some moisture that
is expected to increase late Saturday afternoon into Saturday
night. At the same time elevated instability will increase along
with a moderate to strong trigger which could result in isolated
to possibly scattered thunderstorms in the overnight period
Saturday into Sunday morning. Given how dry fuels are along with
the recent hot stretch, lightning efficiency will he high despite
storms coming in during the night.
The National Weather Service in Medford has issued a Fire Weather
Watch, which is in effect from Saturday afternoon through Sunday
morning.
* IMPACTS...Given the recent prolonged stretch of very hot and
very dry conditions, lightning efficiency will be high to very
high for fire starts. Any fires that develop will likely spread
rapidly. Additionally, winds will allow for new and existing
fires to grow rapidly out of control.
* AFFECTED AREA...All of Fire Zones 615, 616, 617, 618, 619, 620,
622, and 623.
* THUNDERSTORMS...Isolated to scattered thunderstorms are possible
Saturday night. Lightning strikes outside of precipitation
cores are possible and cause for concern.
* OUTFLOW WINDS...Gusts up to 40 mph. These outflow winds can
travel up to 50 miles away from the thunderstorm that caused
it.
* DETAILED URL...View the hazard area in detail at
https://www.wrh.noaa.gov/map/?wfo=mfr
* WHAT...Daytime temperatures between 94 and 98 degrees expected.
* WHERE...Portions of southwest Washington and northwest Oregon,
including the Willamette Valley, the Portland Metro Area, Clark
County lowlands, the western and central Columbia River Gorge, and
Hood River Valley.
* WHEN...From 11 AM to 11 PM PDT Saturday.
* IMPACTS...Hot temperatures may cause heat illnesses.
* WHAT...Dangerously hot conditions with temperatures of 100-110
degrees expected over the weekend. This will pose a Major risk of
heat-related illness.
* WHERE...Portions of central, north central, and northeast Oregon
and central, south central, and southeast Washington.
* WHEN...From 11 AM Saturday to 10 PM PDT Monday.
* 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.
* WHAT...Hot conditions with temperatures of 100-105 degrees
expected over the weekend. This will pose a Moderate to Major risk
of heat-related illness.
* WHERE...In Oregon, Central Oregon, Ochoco-John Day Highlands, and
North Central Oregon. In Washington, Lower Slopes of the Eastern
Washington Cascades Crest.
* WHEN...From 11 AM Saturday to 8 PM PDT Monday.
* 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.
...HOT, DRY, AND UNSTABLE CONDITIONS EXPECTED SATURDAY THROUGH
SUNDAY...
The high pressure will intensify over the region over the weekend
bringing increased instability to the region Saturday through
Sunday. This instability in combination with hot and dry
conditions will result in the potential for extreme fire behavior,
particularly for any currently ongoing fires in the region.
The National Weather Service in Pendleton has issued a Fire
Weather Watch for dry and unstable conditions, which is in effect
from Saturday morning through Sunday evening.
* AFFECTED AREA...Fire Weather Zone 644 Central Blue Mountains.
* TIMING...Saturday 11 AM to Sunday 11 PM.
* RELATIVE HUMIDITY...As low as 10 percent.
* TEMPERATURES...95 to 105.
* IMPACTS...Current fires could exhibit extreme fire behavior.
* HAINES...As high as 6.
...HOT, DRY, AND UNSTABLE CONDITIONS EXPECTED SATURDAY THROUGH
SUNDAY...
The high pressure will intensify over the region over the weekend
bringing increased instability to the region Saturday through
Sunday. This instability in combination with hot and dry
conditions will result in the potential for extreme fire behavior,
particularly for any currently ongoing fires in the region.
* AFFECTED AREA...Fire Weather Zone 642 Southern Blue and
Strawberry Mountains.
* TIMING...Saturday 11 AM to Sunday 11 PM.
* RELATIVE HUMIDITY...As low as 10 percent.
* TEMPERATURES...95 to 105
* IMPACTS...Current fires could exhibit extreme fire behavior.
* HAINES...As high as 6.
...HOT, DRY, AND UNSTABLE CONDITIONS EXPECTED ON SATURDAY...
A passing shortwave and flow becoming more southerly will bring
increased instability to the region on Saturday. This instability
in combination with hot and dry conditions will result in the
potential for extreme fire behavior, particularly for any
currently ongoing fires in the region.
* AFFECTED AREA...Fire Weather Zone 642 Southern Blue and
Strawberry Mountains.
* TIMING...Saturday 11 AM to 11 PM.
* WINDS...Northeast 5 to 10 mph.
* RELATIVE HUMIDITY...As low as 10 percent.
* TEMPERATURES...Up to 100.
* IMPACTS...Current fires will exhibit extreme fire behavior.
* HAINES...As high as 6.
* WHAT...Dangerously hot conditions with temperatures up to 104
degrees expected. This will pose a moderate to major risk of
heat-related illness.
* WHERE...Portions of central, north central, and northeast Oregon
and central and southeast Washington.
* WHEN...From 11 AM Saturday to 10 PM PDT Monday.
* 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.
* WHAT...Hot conditions with temperatures up to 104 degrees
expected. This will pose a major risk of heat-related illness.
* WHERE...Lower Columbia Basin of Oregon and Washington, Kittitas
Valley, and Yakima Valley.
* WHEN...From 11 AM Saturday to 10 PM PDT Monday.
* 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.
* WHAT...Hot conditions with temperatures up to 103 degrees
expected. This will pose a moderate to major risk of heat-related
illness.
* WHERE...In Oregon, Central Oregon, Ochoco-John Day Highlands, and
North Central Oregon. In Washington, Lower Slopes of the Eastern
Washington Cascades Crest.
* WHEN...From 11 AM Saturday to 8 PM PDT Monday.
* 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.
...HOT, DRY, AND UNSTABLE CONDITIONS EXPECTED ON SATURDAY...
A passing shortwave and flow becoming more southerly will bring
increased instability to the region on Saturday. This instability
in combination with hot and dry conditions will result in the
potential for extreme fire behavior, particularly for any
currently ongoing fires in the region.
The National Weather Service in Pendleton has issued a Fire
Weather Watch for dry and unstable conditions, which is in effect
from Saturday morning through Saturday evening.
* AFFECTED AREA...Fire Weather Zone 642 Southern Blue and
Strawberry Mountains.
* TIMING...Saturday 11 AM to 11 PM.
* WINDS...Northeast 5 to 10 mph.
* RELATIVE HUMIDITY...As low as 10 percent.
* TEMPERATURES...Up to 100.
* IMPACTS...Current fires will exhibit extreme fire behavior.
* HAINES...As high as 6.
* WHAT...For the Heat Advisory, hot conditions with temperatures up
to 104 degrees. For the Excessive Heat Warning, dangerously hot
conditions with temperatures up to 110 degrees expected. This will
pose a moderate to major risk of heat-related illness, with
locally extreme risk possible.
* WHERE...Lower Columbia Basin of Oregon and Washington.
* WHEN...For the Heat Advisory, until 10 PM PDT this evening. For
the Excessive Heat Warning, from 11 AM Saturday to 8 PM PDT Monday.
* 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.
* WHAT...Hot conditions with temperatures up to 103 degrees
expected. This will pose a moderate to major risk of heat-related
illness.
* WHERE...In Oregon, Central Oregon, Ochoco-John Day Highlands, and
North Central Oregon. In Washington, Lower Slopes of the Eastern
Washington Cascades Crest.
* WHEN...From 11 AM Saturday to 8 PM PDT Monday.
* 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...Dangerously hot conditions with temperatures up to 104
degrees expected. This will pose a moderate to major risk of
heat-related illness.
* WHERE...Portions of central, north central, and northeast Oregon
and central and southeast Washington.
* WHEN...From 11 AM Saturday to 8 PM PDT Monday.
* 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.
* WHAT...For the Heat Advisory, hot conditions with temperatures up
to 104 degrees. For the Excessive Heat Warning, dangerously hot
conditions with temperatures up to 110 degrees expected. This will
pose a moderate to major risk of heat-related illness, with
locally extreme risk possible.
* WHERE...Lower Columbia Basin of Oregon and Washington.
* WHEN...For the Heat Advisory, until 10 PM PDT this evening. For
the Excessive Heat Warning, from 11 AM Saturday to 8 PM PDT Monday.
* 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.
* WHAT...Dangerously hot conditions with temperatures from 105 to
107. The hottest temperatures will occur Sunday afternoon.
* WHERE...Malheur County.
* WHEN...Until midnight MDT /11 PM PDT/ Monday night.
* IMPACTS...Extreme heat will significantly increase the potential
for heat related illnesses, particularly for those working or
participating in outdoor activities.
* WHAT...Dangerously hot conditions with temperatures from 105 to
110. The hottest temperatures will occur Sunday afternoon.
* WHERE...Portions of southwest and west central Idaho and
southeast Oregon.
* WHEN...Until midnight MDT Monday night.
* IMPACTS...Extreme heat will significantly increase the
potential for heat related illnesses, particularly for those
working or participating in outdoor activities.
* WHAT...Dangerously hot conditions with temperatures up to 105
and lower elevation valleys near the Snake River seeing up to
110.
* WHERE...Baker County.
* WHEN...From 11 AM Saturday to 11 PM PDT Monday.
* IMPACTS...Extreme heat will significantly increase the potential
for heat related illnesses, particularly for those working or
participating in outdoor activities.
* WHAT...Temperatures up to 102 expected.
* WHERE...In Idaho, Southwest Highlands and Owyhee Mountains. In
Oregon, Harney County.
* WHEN...From noon MDT /11 AM PDT/ Saturday to midnight MDT /11
PM PDT/ Monday night.
* IMPACTS...Hot temperatures may cause heat illnesses to occur.
* WHAT...High concentration of smoke particulates from the Falls
Fire.
* WHERE...Harney and Malheur Counties.
* WHEN...AIR QUALITY ALERT IN EFFECT UNTIL 2 PM PDT FRIDAY.
* IMPACTS...Smoke can irritate the eyes, lungs and worsen some
medical conditions. People most at risk to adverse health effects
include infants, young children, people with heart or lung
disease, older adults, and pregnant women.
* ADDITIONAL DETAILS...Smoke levels can change rapidly depending on
weather. Check current conditions on the Oregon Smoke Information
Blog, DEQ's Air Quality Index, or by downloading the free
OregonAIR app on your smartphone.
