* AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North
Cascades Generally above 1500 Feet, Fire Weather Zone 659 West
Slopes of the Central Cascades Generally above 1500 Feet and
Fire Weather Zone 661 East Portion of the Olympic Mountains.
* THUNDERSTORMS...Thunderstorms are favored along the eastern
slopes of the Olympic mountains and more so in the Cascades
this afternoon and evening. Some brief heavy rain or isolated
wetting rains are possible, but lightning strikes on very dry
fuel are capable of new fire starts.
* OUTFLOW WINDS...Outflow winds of 25 to 30 mph are possible.
Outflow winds can occur ahead of and behind storms and cause
erratic wind directions.
* IMPACTS...Scattered lightning in dry fuels can cause multiple
fire starts. Thunderstorms can also bring sudden sharp wind
shifts on existing fires, causing rapid changes in a fire's rate
of spread and direction of spread. Thunderstorm outflow winds
can be a threat for several hours following the start of a new
lightning-caused fire. If a fire were to begin, air quality may
diminish in the surrounding area. With lightning occurrences
having started earlier this week and thunderstorms expected
again today, multiple days in a row of lightning strikes on our
dry fuels could result in a critical number of new wildfires.
* THUNDERSTORMS...A few lightning strikes occurred in the higher
terrain of the Cascades mountains yesterday and that will
resume this afternoon and evening. Multiple days in a row of
lightning strikes on our dry fuels could result in a critical
number of new wildfires.
* WHAT...Flash flooding and debris flows caused by excessive
rainfall from thunderstorms is possible.
* WHERE...A portion of North Central Washington, including the
following counties, Chelan and Okanogan.
* WHEN...From 11 AM PDT this morning through this evening.
* IMPACTS...Heavy rainfall may result in flash flooding or debris
flows in steep terrain, particularly near burn scar locations.
Rain rates of up to an inch per hour will be possible with
thunderstorms.
* ADDITIONAL DETAILS...
- Those within canyons or near burn scars should monitor for
updated information from local authorities.
- http://www.weather.gov/safety/flood
* AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North
Cascades Generally above 1500 Feet, Fire Weather Zone 659 West
Slopes of the Central Cascades Generally above 1500 Feet and
Fire Weather Zone 661 East Portion of the Olympic Mountains.
* THUNDERSTORMS...Thunderstorms are favored along the eastern
slopes of the Olympic mountains and more so in the Cascades
from this afternoon and evening and again Thursday into
Thursday night. Some brief heavy rain or isolated wetting
rains are possible, but lightning strikes on very dry fuel are
capable of new fire starts.
* OUTFLOW WINDS...Outflow winds of 25 to 30 mph are possible.
Outflow winds can occur ahead of and behind storms and cause
erratic wind directions.
* IMPACTS...Scattered lightning in dry fuels can cause multiple
fire starts. Thunderstorms can also bring sudden sharp wind
shifts on existing fires, causing rapid changes in a fire's
rate of spread and direction of spread. Thunderstorm outflow
winds can be a threat for several hours following the start of
a new lightning-caused fire. If a fire were to begin, air
quality may diminish in the surrounding area. With lightning
occurrences having started Tuesday and thunderstorms expect
for two more days, multiple days in a row of lightning strikes
on our dry fuels could result in a critical number of new
wildfires.
* THUNDERSTORMS...Multiple lightning strikes occurred in the
higher terrain of the Cascades mountains yesterday afternoon
and evening and that will resume this afternoon and evening.
Multiple days in a row of lightning strikes on our dry fuels
could result in a critical number of new wildfires.
Thunderstorms with heavy rain are expected to develop late Thursday
morning through Thursday evening in the Cascades. Heavy rainfall in
steep terrain and burn scars may lead to flash flooding or debris
flows on Thursday.
* WHAT...Flash flooding and debris flows caused by excessive
rainfall from thunderstorms is possible.
* WHERE...A portion of North Central Washington, including the
following counties, Chelan and Okanogan. This will include, but
not limited to burn scar locations: Pioneer and 25 Mile burn scars
in Chelan County, and Cedar Creek, Cub Creek, Muckamuck, Walker
Creek, and Eagle Bluff burn scars in Okanogan County.
* WHEN...From Thursday morning through Thursday evening.
* IMPACTS...Heavy rainfall may result in flash flooding or debris
flows in steep terrain, particularly near burn scar locations.
Rain rates of up to an inch per hour will be possible with
thunderstorms.
* ADDITIONAL DETAILS...
- Those within canyons or near burn scars should monitor for
updated information from local authorities.
- http://www.weather.gov/safety/flood
* WHAT...Flash flooding caused by excessive rainfall continues to be
possible.
* WHERE...Portions of Idaho, including the following areas, Boise
Mountains, Camas Prairie, Lower Treasure Valley, Owyhee Mountains,
Southern Twin Falls County, Southwest Highlands, Upper Treasure
Valley, Upper Weiser River, West Central Mountains and Western
Magic Valley and southeast Oregon, including the following area,
Oregon Lower Treasure Valley.
* WHEN...Until midnight MDT /11 PM PDT/ tonight.
* IMPACTS...Heavy rainfall could trigger flash flooding or debris
flows in and near recent wildfire burn scars.
* ADDITIONAL DETAILS...
- https://www.weather.gov/safety/flood
...RED FLAG WARNING IN EFFECT THROUGH THIS EVENING FOR OUTFLOW
WINDS AND HIGH INSTABILITY...
* AFFECTED AREA...In Oregon, Fire Weather Zone 688 Mt. Hood
National Forest Region. In Washington, Fire Weather Zone 634
Southern Gifford Pinchot National Forest and Fire Weather Zone
635 Mt. Adams Ranger District of the Gifford-Pinchot National
Forest.
* THUNDERSTORMS...Isolated to scattered thunderstorms. 20-30%
chance of thunderstorms through this evening. 10-15% chance for
wetting rains with passing thunderstorms.
* UNSTABLE...High instability with elevated mixing heights may
promote pyroconvective activity.
* OUTFLOW WINDS...Instantaneous gusts as high as 40 mph. Gusts at
these speeds can be observed tens of miles away from the core of
the thunderstorm.
* IMPACTS...Conditions may be favorable for rapid fire spread
which may threaten life and property. Thunderstorm outflow
winds may result in unanticipated erratic fire spread. High
instability may result in fire growth. Frequent lightning and
critically dry fuels may result in fire starts.
...RED FLAG WARNING IN EFFECT THROUGH THIS EVENING FOR OUTFLOW
WINDS AND HIGH INSTABILITY...
* AFFECTED AREA...In Oregon, Fire Weather Zone 689 Northern
Willamette National Forest and Fire Weather Zone 690 Southern
Willamette National Forest.
* THUNDERSTORMS...Isolated to scattered thunderstorms. 15-25%
chance of thunderstorms through this evening. 5% chance for
wetting rains with passing thunderstorms.
* UNSTABLE...High instability with elevated mixing heights may
promote pyroconvective activity.
* OUTFLOW WINDS...Instantaneous gusts as high as 40 mph. Gusts at
these speeds can be observed tens of miles away from the core of
the thunderstorm.
* IMPACTS...Conditions may be favorable for rapid fire spread
which may threaten life and property. Thunderstorm outflow
winds may result in unanticipated erratic fire spread. High
instability may result in fire growth. Frequent lightning and
critically dry fuels may result in fire starts.
...RED FLAG WARNING IN EFFECT THROUGH THIS EVENING FOR OUTFLOW
WINDS AND HIGH INSTABILITY...
* AFFECTED AREA...In Oregon, Fire Weather Zone 688 Mt. Hood
National Forest Region. In Washington, Fire Weather Zone 634
Southern Gifford Pinchot National Forest and Fire Weather Zone
635 Mt. Adams Ranger District of the Gifford-Pinchot National
Forest.
* THUNDERSTORMS...Isolated to scattered thunderstorms. 20-30%
chance of thunderstorms through this evening. 10-15% chance for
wetting rains with passing thunderstorms.
* UNSTABLE...High instability with elevated mixing heights may
promote pyroconvective activity.
* OUTFLOW WINDS...Instantaneous gusts as high as 40 mph. Gusts at
these speeds can be observed tens of miles away from the core of
the thunderstorm.
* IMPACTS...Conditions may be favorable for rapid fire spread
which may threaten life and property. Thunderstorm outflow
winds may result in unanticipated erratic fire spread. High
instability may result in fire growth. Frequent lightning and
critically dry fuels may result in fire starts.
* AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North
Cascades Generally above 1500 Feet, Fire Weather Zone 659 West
Slopes of the Central Cascades Generally above 1500 Feet and
Fire Weather Zone 661 East Portion of the Olympic Mountains.
* THUNDERSTORMS...Thunderstorms are favored along the eastern
slopes of the Olympic mountains and more so in the Cascades from
this afternoon and evening and again Thursday into Thursday
night. Some brief heavy rain or isolated wetting rains are
possible, but lightning strikes on very dry fuel are capable of
new fire starts.
* OUTFLOW WINDS...Outflow winds of 25 to 30 mph are possible.
Outflow winds can occur ahead of and behind storms and cause
erratic wind directions.
* IMPACTS...Scattered lightning in dry fuels can cause multiple
fire starts. Thunderstorms can also bring sudden sharp wind
shifts on existing fires, causing rapid changes in a fire's rate
of spread and direction of spread. Thunderstorm outflow winds
can be a threat for several hours following the start of a new
lightning-caused fire. If a fire were to begin, air quality may
diminish in the surrounding area. With lightning occurrences
having started Tuesday and thunderstorms expect for two more
days, multiple days in a row of lightning strikes on our dry
fuels could result in a critical number of new wildfires.
* THUNDERSTORMS...Multiple lightning strikes occurred in the
higher terrain of the Cascades mountains yesterday afternoon
and evening and that will resume this afternoon and evening.
Multiple days in a row of lightning strikes on our dry fuels
could result in a critical number of new wildfires.
* IMPACTS...Abundant lightning on dry fuels resulting in the
potential for numerous new fire starts.
* AFFECTED AREA...In California, Fire weather zones 281, 284,
and 285, and in Oregon, Fire weather zones 617, 623, 624, and
625.
* THUNDERSTORMS...Scattered thunderstorms with abundant
lightning expected. Storms are likely to be wet, but lightning
strikes outside of precipitation cores are possible, and may
cause many new fire starts.
* OUTFLOW WINDS...Gusts of 35 to 50 mph could travel outward up
to 25 miles from thunderstorm cores.
* DETAILED URL...View the hazard area in detail at
https://www.wrh.noaa.gov/map/?wfo=mfr
* AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North
Cascades Generally above 1500 Feet, Fire Weather Zone 659 West
Slopes of the Central Cascades Generally above 1500 Feet and
Fire Weather Zone 661 East Portion of the Olympic Mountains.
* THUNDERSTORMS...Thunderstorms are favored along the eastern
slopes of the Olympic mountains between 11 AM and 3 PM, and
more so in the Cascades from 3 PM to 8 PM. Wetting rains are
possible, but lightning strikes on very dry fuel are capable
of new fire starts.
* OUTFLOW WINDS...Outflow winds of 25 to 30 mph are possible.
Outflow winds can occur ahead of and behind storms and cause
erratic wind directions.
* IMPACTS...Scattered lightning in dry fuels can cause multiple
fire starts. Thunderstorms can also bring sudden sharp wind
shifts on existing fires, causing rapid changes in a fire's
rate of spread and direction of spread. Thunderstorm outflow
winds can be a threat for several hours following the start of
a new lightning-caused fire. If a fire were to begin, air
quality may diminish in the surrounding area.
* THUNDERSTORMS...Multiple lightning strikes occurred in the
higher terrain of the Cascades mountains yesterday afternoon and
evening and that will resume this afternoon and evening.
Multiple days in a row of lightning strikes on our dry fuels
could result in a critical number of new wildfires.
...RED FLAG WARNING IN EFFECT THROUGH THIS EVENING FOR DRY AND
UNSTABLE CONDITIONS, AND THUNDERSTORMS...
.Low pressure in the area is increasing instability and producing
thunderstorms within the area. Instability will be highest within
the Lane and Linn County Cascades. High probability for
pyrocumulus development. Outflow winds from thunderstorms may
cause rapid fire spread.
* AFFECTED AREA...In Oregon, Fire Weather Zone 688 Mt. Hood
National Forest Region. In Washington, Fire Weather Zone 634
Southern Gifford Pinchot National Forest and Fire Weather Zone
635 Mt. Adams Ranger District of the Gifford-Pinchot National
Forest.
* THUNDERSTORMS...Isolated to scattered thunderstorms. 20-30%
chance of thunderstorms today. 10-15% chance for wetting rains
with passing thunderstorms.
* UNSTABLE...High instability with elevated mixing heights may
promote pyroconvective activity.
* OUTFLOW WINDS...Instantaneous gusts as high as 40 mph. Gusts at
these speeds can be observed tens of miles away from the core of
the thunderstorm.
* IMPACTS...Conditions may be favorable for rapid fire spread
which may threaten life and property. Thunderstorm outflow
winds may result in unanticipated erratic fire spread. High
instability may result in fire growth. Frequent lightning and
critically dry fuels may result in fire starts.
...RED FLAG WARNING IN EFFECT THROUGH THIS EVENING FOR DRY AND
UNSTABLE CONDITIONS, AND THUNDERSTORMS...
.Low pressure in the area is increasing instability and producing
thunderstorms within the area. Instability will be highest within
the Lane and Linn County Cascades. High probability for
pyrocumulus development. Outflow winds from thunderstorms may
cause rapid fire spread.
* AFFECTED AREA...In Oregon, Fire Weather Zone 689 Northern
Willamette National Forest and Fire Weather Zone 690 Southern
Willamette National Forest.
* THUNDERSTORMS...Isolated to scattered thunderstorms. 20-30%
chance of thunderstorms today. 5-10% chance for wetting rains
with passing thunderstorms.
* UNSTABLE...High instability with elevated mixing heights may
promote pyroconvective activity.
* OUTFLOW WINDS...Instantaneous gusts as high as 40 mph. Gusts at
these speeds can be observed tens of miles away from the core of
the thunderstorm.
* IMPACTS...Conditions may be favorable for rapid fire spread
which may threaten life and property. Thunderstorm outflow
winds may result in unanticipated erratic fire spread. High
instability may result in fire growth. Frequent lightning and
critically dry fuels may result in fire starts.
...RED FLAG WARNING IN EFFECT THROUGH THIS EVENING FOR DRY AND
UNSTABLE CONDITIONS, AND THUNDERSTORMS...
.Low pressure in the area is increasing instability and producing
thunderstorms within the area. Instability will be highest within
the Lane and Linn County Cascades. High probability for
pyrocumulus development. Outflow winds from thunderstorms may
cause rapid fire spread.
* AFFECTED AREA...In Oregon, Fire Weather Zone 688 Mt. Hood
National Forest Region. In Washington, Fire Weather Zone 634
Southern Gifford Pinchot National Forest and Fire Weather Zone
635 Mt. Adams Ranger District of the Gifford-Pinchot National
Forest.
* THUNDERSTORMS...Isolated to scattered thunderstorms. 20-30%
chance of thunderstorms today. 10-15% chance for wetting rains
with passing thunderstorms.
* UNSTABLE...High instability with elevated mixing heights may
promote pyroconvective activity.
* OUTFLOW WINDS...Instantaneous gusts as high as 40 mph. Gusts at
these speeds can be observed tens of miles away from the core of
the thunderstorm.
* IMPACTS...Conditions may be favorable for rapid fire spread
which may threaten life and property. Thunderstorm outflow
winds may result in unanticipated erratic fire spread. High
instability may result in fire growth. Frequent lightning and
critically dry fuels may result in fire starts.
* WHAT...Flash flooding caused by excessive rainfall continues to be
possible.
* WHERE...Portions of Idaho, including the following areas, Boise
Mountains, Camas Prairie, Lower Treasure Valley, Owyhee Mountains,
Southern Twin Falls County, Southwest Highlands, Upper Treasure
Valley, Upper Weiser River, West Central Mountains and Western
Magic Valley and Oregon, including the following areas, Baker
County, Malheur County and Oregon Lower Treasure Valley.
* WHEN...Through this evening.
* IMPACTS...Heavy rainfall could trigger flash flooding or debris
flows in and near recent wildfire burn scars.
* ADDITIONAL DETAILS...
- https://www.weather.gov/safety/flood
...RED FLAG WARNING IN EFFECT THROUGH THIS EVENING FOR DRY AND
UNSTABLE CONDITIONS, AND THUNDERSTORMS...
.Low pressure in the area is increasing instability and producing
thunderstorms within the area. Instability will be highest within
the Lane and Linn County Cascades. High probability for
pyrocumulus development. Within thunderstorms, outflow winds may
cause rapid fire spread.
The National Weather Service in Portland has issued a Red Flag
Warning for thunderstorms, which is in effect from 9 AM this
morning to 9 PM PDT this evening.
* AFFECTED AREA...In Oregon, Fire Weather Zone 688 Mt. Hood
National Forest Region. In Washington, Fire Weather Zone 634
Southern Gifford Pinchot National Forest and Fire Weather Zone
635 Mt. Adams Ranger District of the Gifford-Pinchot National
Forest.
* THUNDERSTORMS...Isolated to scattered thunderstorms. 25-30%
chance of thunderstorms between 9 AM and 1 PM.
* DRY AND UNSTABLE...Unstable conditions with elevated mixing
heights may promote pyroconvective activity.
* OUTFLOW WINDS...Outflow wind gusts up to 35 mph.
* IMPACTS...Conditions may be favorable for rapid fire spread
which may threaten life and property. Thunderstorm outflow
winds may result in unanticipated erratic fire spread. High
instability may result in fire growth. Frequent lightning and
critically dry fuels may result in fire starts.
* IMPACTS...Thunderstorm outflow winds may result in erratic
fire spread. Frequent lightning and critically dry fuels may
result in numerous fire starts.
...RED FLAG WARNING IN EFFECT THROUGH THIS EVENING FOR DRY AND
UNSTABLE CONDITIONS, AND THUNDERSTORMS...
.Low pressure in the area is increasing instability and producing
thunderstorms within the area. Instability will be highest within
the Lane and Linn County Cascades. High probability for
pyrocumulus development. Within thunderstorms, outflow winds may
cause rapid fire spread.
* AFFECTED AREA...In Oregon, Fire Weather Zone 689 Northern
Willamette National Forest and Fire Weather Zone 690 Southern
Willamette National Forest.
* THUNDERSTORMS...Isolated to scattered thunderstorms. 15-25%
chance of thunderstorms after 1 PM.
* DRY AND UNSTABLE...Very unstable conditions with elevated
mixing heights may promote pyroconvective activity.
* OUTFLOW WINDS...Outflow wind gusts up to 35 mph.
* IMPACTS...Conditions may be favorable for rapid fire spread
which may threaten life and property. Thunderstorm outflow
winds may result in unanticipated erratic fire spread. High
instability may result in fire growth. Frequent lightning and
critically dry fuels may result in fire starts.
...RED FLAG WARNING IN EFFECT THROUGH THIS EVENING FOR DRY AND
UNSTABLE CONDITIONS, AND THUNDERSTORMS...
.Low pressure in the area is increasing instability and producing
thunderstorms within the area. Instability will be highest within
the Lane and Linn County Cascades. High probability for
pyrocumulus development. Within thunderstorms, outflow winds may
cause rapid fire spread.
The National Weather Service in Portland has issued a Red Flag
Warning for thunderstorms, which is in effect from 9 AM this
morning to 9 PM PDT this evening.
* AFFECTED AREA...In Oregon, Fire Weather Zone 688 Mt. Hood
National Forest Region. In Washington, Fire Weather Zone 634
Southern Gifford Pinchot National Forest and Fire Weather Zone
635 Mt. Adams Ranger District of the Gifford-Pinchot National
Forest.
* THUNDERSTORMS...Isolated to scattered thunderstorms. 25-30%
chance of thunderstorms between 9 AM and 1 PM.
* DRY AND UNSTABLE...Unstable conditions with elevated mixing
heights may promote pyroconvective activity.
* OUTFLOW WINDS...Outflow wind gusts up to 35 mph.
* IMPACTS...Conditions may be favorable for rapid fire spread
which may threaten life and property. Thunderstorm outflow
winds may result in unanticipated erratic fire spread. High
instability may result in fire growth. Frequent lightning and
critically dry fuels may result in fire starts.
* IMPACTS...Thunderstorm outflow winds may result in erratic
fire spread. Frequent lightning and critically dry fuels may
result in numerous fire starts.
The National Weather Service in Seattle has issued a Red Flag
Warning for dry thunderstorms and gusty outflow winds, which is
in effect from 11 AM this morning to 8 PM PDT this evening.
* AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North
Cascades Generally above 1500 Feet, Fire Weather Zone 659 West
Slopes of the Central Cascades Generally above 1500 Feet and
Fire Weather Zone 661 East Portion of the Olympic Mountains.
* THUNDERSTORMS...Thunderstorms are favored along the eastern
slopes of the Olympic mountains between 11 AM and 3 PM, and more
so in the Cascades from 3 PM to 8 PM. Wetting rains are
possible, but lightning strikes on very dry fuel are capable of
new fire starts.
* OUTFLOW WINDS...Outflow winds of 25 to 30 mph are possible.
Outflow winds can occur ahead of and behind storms and cause
erratic wind directions.
* IMPACTS...Scattered lightning in dry fuels can cause multiple
fire starts. Thunderstorms can also bring sudden sharp wind
shifts on existing fires, causing rapid changes in a fire's
rate of spread and direction of spread. Thunderstorm outflow
winds can be a threat for several hours following the start of
a new lightning-caused fire. If a fire were to begin, air
quality may diminish in the surrounding area.
The National Weather Service in Portland has issued a Red Flag
Warning for thunderstorms and unstable conditions, which is in
effect from 9 AM to 9 PM PDT Wednesday.
* AFFECTED AREA...In Oregon, Fire Weather Zone 689 Northern
Willamette National Forest and Fire Weather Zone 690 Southern
Willamette National Forest.
* THUNDERSTORMS...Isolated to scattered thunderstorms.
* DRY AND UNSTABLE...Unstable conditions with elevated mixing
heights may promote pyroconvective activity.
* OUTFLOW WINDS...Instantaneous gusts as high as 40 mph. Gusts at
these speeds can be observed tens of miles away from the core of
the thunderstorm.
* IMPACTS...Conditions may be favorable for rapid fire spread
which may threaten life and property. Thunderstorm outflow winds
may result in unanticipated erratic fire spread. High
instability may result in fire growth. Frequent lightning and
critically dry fuels may result in fire starts.