At 323 PM PDT, Doppler radar was tracking a strong thunderstorm near
Sherman Pass, or 44 miles east of Omak. This storm was nearly
stationary.
HAZARD...Pea size hail.
SOURCE...Radar indicated.
IMPACT...Minor hail damage to outdoor objects is possible.
Locations impacted include...
Sherman Pass.
This includes U.S. Highway 20 in Washington between mile markers 311
and 331.
A low pressure system will bring increased moisture with increasing
showers and thunderstorms. Heavy rainfall amounts associated with
slow-moving thunderstorms may lead to flash flooding and debris
flows over recent burn scars and areas of steep terrain Monday
afternoon and evening.
* WHAT...Flash flooding caused by excessive rainfall is possible.
* WHERE...A portion of North Central Washington, including the
following counties, Chelan and Okanogan.
* WHEN...From Monday afternoon through Monday evening.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations
including recent burn scars. Flash flooding of recent burn scars
may lead to debris flows.
* ADDITIONAL DETAILS...
- Scattered to numerous showers and thunderstorms will develop
Monday afternoon containing moderate to heavy rain.
- http://www.weather.gov/safety/flood
* Affected Area: Foothills of Central Washington Cascades (Zone
705), Waterville Plateau (Zone 706), Western Columbia Basin
(Zone 707), Eastern Columbia Basin -Palouse -Spokane Area
(Zone 708) and Lower Palouse -Snake River (Zone 709).
* Winds: West to Southwest 10 to 20 mph with gusts up to 35 mph,
except 15 to 25 mph with gusts up to 40 MPH on the Waterville
Plateau.
* Relative Humidities: 10 to 20 percent.
* Impacts: Rapid fire spread is likely with any new or existing
fires.
* AFFECTED AREA...Fire Weather Zone 690 Kittitas Valley.
* TIMING...Until 10 PM PDT this evening.
* WINDS...Northwest 15 to 25 mph with gusts up to 40 mph.
* RELATIVE HUMIDITY...As low as 15 percent.
* IMPACTS...Any fire that develops will catch and spread
quickly. Outdoor burning is not recommended.
* AFFECTED AREA...Fire Weather Zones 691 Lower Columbia Basin of
Oregon, 691 Lower Columbia Basin of Washington and 701 Eastern
Columbia River Gorge of Oregon.
* TIMING...Until 10 PM PDT this evening.
* WINDS...West 15 to 25 mph with gusts up to 35 mph.
* RELATIVE HUMIDITY...13 to 20 percent.
* IMPACTS...Any fire that develops will catch and spread
quickly. Outdoor burning is not recommended.
* AFFECTED AREA...Fire Weather Zones 696 John Day Valley, 700
Central Mountains of Oregon and 703 Warm Springs Reservation.
* TIMING...Until 10 PM PDT this evening.
* WINDS...West 10 to 15 mph with gusts up to 25 mph.
* RELATIVE HUMIDITY...10 to 15 percent.
* IMPACTS...Any fire that develops will catch and spread
quickly. Outdoor burning is not recommended.
The National Weather Service in Pendleton has issued a Red Flag
Warning for wind and low relative humidity, which is in effect
until 10 PM PDT this evening.
* AFFECTED AREA...Fire Weather Zones 697 Central Blue Mountains
and 698 Southern Blue Mountains.
* TIMING...Until 10 PM PDT this evening.
* WINDS...West 10 to 15 mph with gusts up to 25 mph.
* RELATIVE HUMIDITY...10 to 15 percent.
* IMPACTS...Any fire that develops will catch and spread
quickly. Outdoor burning is not recommended.
* AFFECTED AREA...Fire Weather Zones 691 Lower Columbia Basin of
Oregon, 691 Lower Columbia Basin of Washington and 701 Eastern
Columbia River Gorge of Oregon.
* TIMING...Until 10 PM PDT this evening.
* WINDS...West 15 to 25 mph with gusts up to 35 mph.
* RELATIVE HUMIDITY...13 to 20 percent.
* IMPACTS...Any fire that develops will catch and spread
quickly. Outdoor burning is not recommended.
* Affected Area: Foothills of Central Washington Cascades (Zone
705), Waterville Plateau (Zone 706), Western Columbia Basin
(Zone 707), Eastern Columbia Basin -Palouse -Spokane Area
(Zone 708) and Lower Palouse -Snake River (Zone 709).
* Winds: West to Southwest 10 to 20 mph with gusts up to 35 mph,
except 15 to 25 mph with gusts up to 40 MPH on the Waterville
Plateau.
* Relative Humidities: 11 to 20 percent.
* Impacts: Rapid fire spread is likely with any new or existing
fires.
The National Weather Service in Spokane has issued a Red Flag
Warning for wind and low relative humidity, which is in effect
from 2 PM to 10 PM PDT Friday. The Fire Weather Watch is no
longer in effect.
* Affected Area: Foothills of Central Washington Cascades (Zone
705), Waterville Plateau (Zone 706), Western Columbia Basin
(Zone 707), Eastern Columbia Basin -Palouse -Spokane Area
(Zone 708) and Lower Palouse -Snake River (Zone 709).
* Winds: West to Southwest 10 to 20 mph with gusts up to 35 mph,
except 15 to 25 mph with gusts up to 40 MPH on the Waterville
Plateau.
* Relative Humidities: 12 to 20 percent.
* Impacts: Rapid fire spread is likely with any new or existing
fires.
...DRY AND BREEZY TO WINDY CONDITIONS EXPECTED ACROSS PORTIONS OF
CENTRAL AND EASTERN OREGON AND SOUTH CENTRAL WASHINGTON THROUGH
FRIDAY...
.Warm, dry, and breezy to windy conditions are expected through
Friday across portions of central and eastern Oregon and central
Washington, especially through the Cascade gaps. Afternoon
relative humidity will be low to very low, and overnight relative
humidity recovery is forecast to be poor to moderate. Strongest
winds are expected Friday.
The National Weather Service in Pendleton has issued a Red Flag
Warning for wind and low relative humidity, which is in effect
from 1 PM to 10 PM PDT Friday. The Fire Weather Watch is no
longer in effect.
* AFFECTED AREA...Fire Weather Zone 690 Kittitas Valley.
* TIMING...From 1 PM to 10 PM PDT Friday.
* WINDS...West 15 to 25 mph with gusts up to 40 mph.
* RELATIVE HUMIDITY...As low as 15 percent.
* IMPACTS...Any fire that develops will catch and spread
quickly. Outdoor burning is not recommended.
...DRY AND BREEZY TO WINDY CONDITIONS EXPECTED ACROSS PORTIONS OF
CENTRAL AND EASTERN OREGON AND SOUTH CENTRAL WASHINGTON THROUGH
FRIDAY...
.Warm, dry, and breezy to windy conditions are expected through
Friday across portions of central and eastern Oregon and central
Washington, especially through the Cascade gaps. Afternoon
relative humidity will be low to very low, and overnight relative
humidity recovery is forecast to be poor to moderate. Strongest
winds are expected Friday.
* AFFECTED AREA...Fire Weather Zones 691 Lower Columbia Basin of
Oregon, 691 Lower Columbia Basin of Washington and 701 Eastern
Columbia River Gorge of Oregon.
* TIMING...Until 10 PM PDT Friday.
* WINDS...West 15 to 25 mph with gusts up to 35 mph.
* RELATIVE HUMIDITY...As low as 10 percent.
* IMPACTS...Any fire that develops will catch and spread
quickly. Outdoor burning is not recommended.
...DRY AND BREEZY TO WINDY CONDITIONS EXPECTED ACROSS PORTIONS OF
CENTRAL AND EASTERN OREGON AND SOUTH CENTRAL WASHINGTON THROUGH
FRIDAY...
.Warm, dry, and breezy to windy conditions are expected through
Friday across portions of central and eastern Oregon and central
Washington, especially through the Cascade gaps. Afternoon
relative humidity will be low to very low, and overnight relative
humidity recovery is forecast to be poor to moderate. Strongest
winds are expected Friday.
* AFFECTED AREA...Fire Weather Zones 691 Lower Columbia Basin of
Oregon, 691 Lower Columbia Basin of Washington and 701 Eastern
Columbia River Gorge of Oregon.
* TIMING...Until 10 PM PDT Friday.
* WINDS...West 15 to 25 mph with gusts up to 35 mph.
* RELATIVE HUMIDITY...As low as 10 percent.
* IMPACTS...Any fire that develops will catch and spread
quickly. Outdoor burning is not recommended.
...DRY AND BREEZY TO WINDY CONDITIONS EXPECTED ACROSS PORTIONS OF
CENTRAL AND EASTERN OREGON AND SOUTH CENTRAL WASHINGTON THROUGH
FRIDAY...
.Warm, dry, and breezy to windy conditions are expected through
Friday across portions of central and eastern Oregon and central
Washington, especially through the Cascade gaps. Afternoon
relative humidity will be low to very low, and overnight relative
humidity recovery is forecast to be poor to moderate. Strongest
winds are expected Friday.
* AFFECTED AREA...Fire Weather Zones 700 Central Mountains of
Oregon and 703 Warm Springs Reservation.
* TIMING...Until 10 PM PDT Friday.
* WINDS...West 10 to 15 mph with gusts up to 25 mph.
* RELATIVE HUMIDITY...As low as 10 percent.
* IMPACTS...Any fire that develops will catch and spread
quickly. Outdoor burning is not recommended.
...DRY AND BREEZY TO WINDY CONDITIONS EXPECTED ACROSS PORTIONS OF
CENTRAL AND EASTERN OREGON AND SOUTH CENTRAL WASHINGTON THROUGH
FRIDAY...
.Warm, dry, and breezy to windy conditions are expected through
Friday across portions of central and eastern Oregon and central
Washington, especially through the Cascade gaps. Afternoon
relative humidity will be low to very low, and overnight relative
humidity recovery is forecast to be poor to moderate. Strongest
winds are expected Friday.
* AFFECTED AREA...Fire Weather Zone 696 John Day Valley.
* TIMING...Until 10 PM PDT Friday.
* WINDS...West 10 to 15 mph with gusts up to 20 mph.
* RELATIVE HUMIDITY...As low as 10 percent.
* IMPACTS...Any fire that develops will catch and spread
quickly. Outdoor burning is not recommended.
* Affected Area: Foothills of Central Washington Cascades (Zone
705), Waterville Plateau (Zone 706), Western Columbia Basin
(Zone 707), Eastern Columbia Basin -Palouse -Spokane Area
(Zone 708) and Lower Palouse -Snake River (Zone 709).
* Winds: Southwest 10 to 20 mph with gusts up to 35 mph.
* Relative Humidities: 12 to 20 percent.
* Impacts: Rapid fire spread is possible.
* WHAT...Hot conditions with high temperatures in the 80s to near
90, and low temperatures in the upper 50s to low 60s. This will
pose a moderate risk of heat-related illness.
* WHERE...Portions of northwest and west central Washington.
* WHEN...Until 8 PM PDT this evening.
* 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.
A strong gust front will push down the Okanogan Valley tonight
through 300 AM with sustained winds of 20 to 30 mph and gusts to
between 40 to 50 mph. Strong winds with the front will occur for
up to a couple of hours and then remain breezy through the rest of
the night. Winds will be capable of breaking small tree limbs,
causing isolated power outages, and blowing around unsecured light
weight objects.
* WHAT...Hot conditions with high temperatures in the 80s to low
90s, and low temperatures in the upper 50s to low 60s. This will
pose a moderate risk of heat-related illness.
* WHERE...Portions of northwest and west central Washington.
* WHEN...Until 5PM 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.