...ISOLATED THUNDERSTORM CHANCES THIS AFTERNOON, OVERNIGHT, AND
WEDNESDAY...
A low pressure system will move north-northeastward into the
Pacific Northwest late today through Wednesday night. This system
will provide enough moisture and elevated instability for high-
based showers and isolated thunderstorms to develop late this
afternoon, overnight, and Wednesday.
* AFFECTED AREA...Fire Weather Zones 690 Kittitas Valley, 694
Yakama Alpine District and 695 East Washington South Central
Cascade Mountains.
* IMPACTS...Any lightning strikes combined with hot and dry
conditions can create new fire starts.
* THUNDERSTORMS...Isolated to scattered thunderstorms are
possible.
* 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.
* THUNDERSTORMS...Scattered thunderstorms with LAL 3.
* OUTFLOW WINDS...Gusty and erratic winds are possible in the
vicinity of any thunderstorms that develop.
* 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.
* WHAT...Hot conditions during the day for the valleys. Highs 93 to
105. Overnight lows mainly in the upper 50s and 60s.
* WHERE...Portions of North and North Central Idaho and Central,
East Central, North Central, Northeast, and Southeast Washington.
* WHEN...From noon today to 10 PM PDT Thursday.
* IMPACTS...Heat will increase the risk of heat-related illnesses,
especially those without effective cooling or adequate hydration.
* WHAT...Daytime temperatures between 95 to 100 expected. Overnight
lows between 65 to 70 will limit chances to recover from the heat
Tuesday night.
* WHERE...In Oregon, Central Columbia River Gorge I-84 Corridor,
East Portland Metro, Inner Portland Metro, and West Columbia River
Gorge I-84 Corridor. In Washington, Central Columbia River Gorge
SR 14 Corridor, East Clark County Lowlands, Inner Vancouver Metro,
and West Columbia River Gorge SR 14 Corridor.
* WHEN...From 11 AM this morning to 8 AM PDT Wednesday.
* IMPACTS...Hot temperatures may cause heat illnesses.
* WHAT...Dangerously hot conditions. Afternoon high temperatures of
95 to 103 degrees accompanied by overnight low temperatures in the
mid-60s to lower 70s. This will pose a major risk of heat-related
illness.
* WHERE...Kittitas Valley and Yakima Valley.
* WHEN...From noon today to 10 PM PDT Thursday.
* 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. Afternoon high temperatures of 95 to 105
degrees accompanied by overnight low temperatures in the lower 60s
to lower 70s. This will pose a major risk of heat-related illness.
* WHERE...Lower Columbia Basin of Oregon and Washington.
* WHEN...From noon today to 10 PM PDT Thursday.
* 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. Afternoon high temperatures of 95 to 105
degrees accompanied by overnight low temperatures in the lower 60s
to mid-70s. This will pose a moderate to locally major risk of
heat-related illness.
* WHERE...Eastern Columbia River Gorge of Oregon and Washington,
Foothills of the Northern Blue Mountains of Oregon, and Foothills
of the Blue Mountains of Washington.
* WHEN...From noon today to 10 PM PDT Wednesday.
* 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. Afternoon high temperatures of 95 to 105
degrees accompanied by overnight low temperatures in the lower 60s
to lower 70s. This will pose a moderate to locally major risk of
heat-related illness.
* WHERE...In Oregon, Foothills of the Southern Blue Mountains of
Oregon and North Central Oregon. In Washington, Simcoe Highlands.
* WHEN...From noon today to 10 PM PDT Wednesday.
* 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.
...THUNDERSTORMS TO INCREASE CHANCES OF RED FLAG CONDITIONS LATER
TUESDAY INTO WEDNESDAY...
An upper low pressure system will clip the region as it moves
north offshore the PacNW. This system will provide enough
elevated instability for isolated thunderstorms to develop late
Tuesday through Wednesday.
* AFFECTED AREA...Fire Weather Zones 690 Kittitas Valley, 694
Yakama Alpine District and 695 East Washington South Central
Cascade Mountains.
* IMPACTS...Any lightning strikes combined with hot and dry
conditions can create new fire starts.
* THUNDERSTORMS...Isolated to scattered thunderstorms are
possible.
Re-transmitting the message. No changes to forecast.
...DRY AND A SLIGHT CHANCE FOR THUNDERSTORMS TUESDAY AFTERNOON
INTO WEDNESDAY...
.A slight chance for thunderstorms develop Tuesday afternoon as
an upper level disturbance shifts south to north across the
forecast area into Wednesday.
* AFFECTED AREA...In Washington, Fire Weather Zone 633 Clark
County Lowlands and Swift Reservoir Region, Fire Weather Zone
634 Southern Gifford Pinchot National Forest, Fire Weather
Zone 635 Mt. Adams Ranger District of the Gifford-Pinchot
National Forest and Fire Weather Zone 636 Western Columbia
River Gorge in Oregon and Washington.
* THUNDERSTORMS...2 (A slight chance of thunderstorms).
* IMPACTS...Lightning and critically dry fuels may result in
numerous fire starts. Thunderstorm outflow winds may result in
erratic fire spread.
* 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 noon Tuesday to 10 PM PDT Thursday.
* 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 temperatures up to 98 to 103 degrees
expected. This will pose a moderate to locally major risk of
heat-related illness.
* WHERE...In Oregon, Foothills of the Southern Blue Mountains of
Oregon and North Central Oregon. In Washington, Simcoe Highlands.
* WHEN...From noon Tuesday to 10 PM PDT Wednesday.
* 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 temperatures up to 101 to 103 degrees
expected. This will pose a moderate to locally major risk of
heat-related illness.
* WHERE...Eastern Columbia River Gorge of Oregon and Washington,
Foothills of the Northern Blue Mountains of Oregon, and Foothills
of the Blue Mountains of Washington.
* WHEN...From noon Tuesday to 10 PM PDT Wednesday.
* 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.
...DRY AND A SLIGHT CHANCE FOR THUNDERSTORMS TUESDAY AFTERNOON
INTO WEDNESDAY...
.A slight chance for thunderstorms develop Tuesday afternoon as an
upper level disturbance shifts south to north across the forecast
area into Wednesday.
The National Weather Service in Portland has issued a Fire
Weather Watch for thunderstorms, which is in effect from Tuesday
afternoon through Wednesday evening.
* AFFECTED AREA...In Washington, Fire Weather Zone 633 Clark
County Lowlands and Swift Reservoir Region, Fire Weather Zone
634 Southern Gifford Pinchot National Forest, Fire Weather
Zone 635 Mt. Adams Ranger District of the Gifford-Pinchot
National Forest and Fire Weather Zone 636 Western Columbia
River Gorge in Oregon and Washington.
* THUNDERSTORMS...2 (A slight chance of thunderstorms).
* IMPACTS...Lightning and critically dry fuels may result in
numerous fire starts. Thunderstorm outflow winds may result in
erratic fire spread.
* 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 noon Tuesday to 10 PM PDT Thursday.
* 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 temperatures up to 101 to 103 degrees
expected. This will pose a moderate to locally major risk of
heat-related illness.
* WHERE...Eastern Columbia River Gorge of Oregon and Washington,
Foothills of the Northern Blue Mountains of Oregon, and Foothills
of the Blue Mountains of Washington.
* WHEN...From noon Tuesday to 10 PM PDT Wednesday.
* 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.
...THUNDERSTORMS TO INCREASE CHANCES OF RED FLAG CONDITIONS LATER
TUESDAY INTO WEDNESDAY...
The National Weather Service in Pendleton has issued a Fire
Weather Watch for abundant lightning, which is in effect from
Tuesday evening through Wednesday evening.
* AFFECTED AREA...Fire Weather Zones 690 Kittitas Valley, 694
Yakama Alpine District and 695 East Washington South Central
Cascade Mountains.
* IMPACTS...Any lightning strikes combined with hot and dry
conditions can create new fire starts.
* THUNDERSTORMS...Isolated to scattered thunderstorms are
possible.
...SCATTERED DRY THUNDERSTORMS POSSIBLE ON WEDNESDAY...
Scattered thunderstorms containing little to no rainfall will be
possible over much of North Central Washington Wednesday afternoon
and evening. Isolated thunderstorms are possible elsewhere across
Eastern Washington and North Idaho.
The National Weather Service in Spokane has issued a Fire Weather
Watch for thunderstorms, which is in effect from Wednesday
afternoon through Wednesday evening.
* 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), Fire Weather Zone 698 East Washington North
Cascades (Zone 698), Fire Weather Zone 699 Okanogan Highlands
and Kettle Mountains (Zone 699), Fire Weather Zone 702
Colville Reservation (Zone 702), Fire Weather Zone 703
Okanogan Valley (Zone 703), Fire Weather Zone 704 Methow
Valley (Zone 704), Fire Weather Zone 705 Foothills of Central
Washington Cascades (Zone 705) and Fire Weather Zone 706
Waterville Plateau (Zone 706).
* Thunderstorms: Scattered dry thunderstorms are possible, LAL 6.
* Outflow Winds: Gusty and erratic winds are possible in the
vicinity of any thunderstorms that develop.
* Impacts: Thunderstorms containing little to no rain combined
with dry fuels will lead to the potential for new fire starts
that may overwhelm initial attack capabilities. Gusty winds near
thunderstorms may result in rapid fire spread with any new or
existing fires.
The National Weather Service in Seattle has issued a Fire Weather
Watch for dry thunderstorms and gusty outflow winds, which is in
effect from Tuesday evening through Wednesday evening.
* 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.
* THUNDERSTORMS...Scattered thunderstorms with LAL 3.
* OUTFLOW WINDS...Gusty and erratic winds are possible in the
vicinity of any thunderstorms that develop.
* 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.
* WHAT...Hot conditions during the day for the valleys. Highs 93 to
105. Overnight lows mainly in the upper 50s and 60s.
* WHERE...Portions of North and North Central Idaho and Central,
East Central, North Central, Northeast, and Southeast Washington.
* WHEN...From noon Tuesday to 10 PM PDT Thursday.
* IMPACTS...Heat will increase the risk of heat-related illnesses,
especially those without effective cooling or adequate hydration.
