Showers and thunderstorms have developed this afternoon across the
Washington Cascade crests. These storms have produced abundant
lighting and heavy downpours at times, with as much as an inch an
hour reported near Stevens Pass. While these storms are largely
expected to remain over the wilderness, those outdoors should
consider finding shelter until storms dissipate. Those with
friends or loved ones hiking or camping in the area should reach
out if possible, as these storms could produce minor flooding in
canyons or deep valleys, combined with the threat of lightning and
even small hail.
* WHAT...Minor flooding caused by excessive rainfall is expected.
* WHERE...US 2 at Stevens Pass
* WHEN...Until 800 PM PDT.
* IMPACTS...Water over roadways.
* ADDITIONAL DETAILS...
- At 507 PM PDT, Doppler radar indicated heavy rain due to
thunderstorms. Minor flooding is ongoing or expected to begin
shortly for Stevens Pass. Between 0.5 and 1.25 inches of rain
have fallen.
- Stevens Pass is the most likely place to experience minor
flooding.
- Some locations that will experience flooding include...
US 2 at Stevens Pass
- http://www.weather.gov/safety/flood
Heavy rain from thunderstorms will cause to ponding of water on US
2 as the thunderstorms move eastward this afternoon.
* WHAT...Flooding, including ponding of water on the highway, caused
by excessive rainfall is expected.
* WHERE...A portion of west central Washington, including the
following county, King.
* WHEN...Until 600 PM PDT.
* IMPACTS...Minor ponding of water on the highway.
* ADDITIONAL DETAILS...
- At 509 PM PDT, Doppler radar and automated rain gauges
indicated heavy rain of one inch due to thunderstorms. Minor
flooding and ponding of water is possible within the advisory
area.
- Some locations that may experience flooding include...
US 2 at Stevens Pass.
- http://www.weather.gov/safety/flood
* AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North
Cascades Generally above 1500 Feet.
* THUNDERSTORMS...Scattered thunderstorms are expected over the
North Cascades with LAL of 3 during the afternoon and evening
hours.
* 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 with temperatures in the mid 80s to low 90s
expected. This will pose a moderate to isolated major risk of
heat-related illness.
* WHERE...Portions of northwest and west central Washington.
* WHEN...Until 9 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.
* ADDITIONAL DETAILS...Areas of elevated smoke and haze are expected
to remain over western Washington through Friday. This could
result in slightly lower temperatures than forecast.
FFWOTX
The National Weather Service in Spokane has issued a
* Flash Flood Warning for...
The Cedar Creek Burn Scar in...
Western Okanogan County in north central Washington...
* Until 500 PM PDT.
* At 154 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain over the Cedar Creek Burn Scar. Between 0.4 and 0.8
inches of rain have fallen. Flash flooding is ongoing or expected
to begin shortly.
Excessive rainfall over the warning area will cause mud slides near
steep terrain. The mud slide can consist of rock, mud, vegetation
and other loose materials.
HAZARD...Flash flooding caused by thunderstorms in and around
the Cedar Creek Burn Scar.
SOURCE...Radar.
IMPACT...Flooding of areas in and around the Cedar Creek Burn
Scar.
* Some locations that will experience flash flooding include...
Mazama.
The Yakima Regional Clean Air Agency has issued an Air Quality
Alert...IN EFFECT UNTIL FURTHER NOTICE.
A Smoke Air Quality Alert has been issued. Wildfires burning in the
region combined with forecasted conditions will cause air quality to
reach unhealthy levels.
Pollutants in smoke can cause burning eyes...runny nose...aggravate
heart and lung diseases...and aggravate other serious health
problems. Limit outdoor activities and keep children indoors if it
is smoky. Please follow medical advice if you have a heart or lung
condition.
Information about air quality is on the Washington Department of
Ecology Web site at http://www.ecy.wa.gov/air.html or call 360-407-
6000.
The Southwest Clean Air Agency will allow the Air Quality Advisory to
expire at 1 PM PDT Friday as air quality conditions are expected to
gradually improve.
More information about air quality can be found at:
www.swcleanair.gov
...ABUNDANT LIGHTNING IN CASCADES THIS AFTERNOON AND EVENING...
Showers and thunderstorms will expand in coverage over the
Cascades this afternoon with abundant lightning into the evening
hours. A mix of wet and dry thunderstorms is expected with enough
lightning to occur to overcome the extinguishing effects of rain.
This will especially be so for lightning strikes outside of cores
of thunderstorms.
* 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 703 Okanogan Valley
(Zone 703), Fire Weather Zone 704 Methow Valley (Zone 704) and
Fire Weather Zone 705 Foothills of Central Washington Cascades
(Zone 705).
* Thunderstorms: Abundant lightning resulting in frequent cloud to
ground lightning strikes.
* Outflow Winds: Gusty and erratic outflow winds of up to 40 mph
will be possible.
* Impacts: Lightning may result in new fire starts. Gusty outflow
winds will be capable of rapid fire spread and causing erratic
wind directions.
* AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North
Cascades Generally above 1500 Feet.
* THUNDERSTORMS...Scattered thunderstorms are expected over the
North Cascades with LAL of 3 during the afternoon and evening
hours.
* 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.
...ABUNDANT LIGHTNING IN CASCADES THIS AFTERNOON AND EVENING...
Showers and thunderstorms will expand in coverage over the
Cascades this afternoon with abundant lightning into the evening
hours. A mix of wet and dry thunderstorms is expected with enough
lightning to occur to overcome the extinguishing effects of rain.
This will especially be so for lightning strikes outside of cores
of thunderstorms.
The National Weather Service in Spokane has issued a Red Flag
Warning for thunderstorms, which is in effect from noon today to
midnight PDT tonight.
* 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 703 Okanogan Valley
(Zone 703), Fire Weather Zone 704 Methow Valley (Zone 704) and
Fire Weather Zone 705 Foothills of Central Washington Cascades
(Zone 705).
* Thunderstorms: Abundant lightning resulting in frequent cloud to
ground lightning strikes.
* Outflow Winds: Gusty and erratic outflow winds of up to 40 mph
will be possible.
* Impacts: Lightning may result in new fire starts. Gusty outflow
winds will be capable of rapid fire spread and causing erratic
wind directions.
* WHAT...Hot conditions with temperatures in the mid 80s to low 90s
expected. This will pose a moderate to isolated major risk of
heat-related illness.
* WHERE...Portions of northwest and west central Washington.
* WHEN...Until 9 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.
* ADDITIONAL DETAILS...Areas of elevated smoke and haze are expected
to remain over western Washington through Friday. This could
result in slightly lower temperatures than forecast.
* WHAT...Hot conditions with temperatures in the upper 80s to low
90s expected. This will pose a moderate to isolated major risk of
heat-related illness.
* WHERE...Portions of northwest and west central Washington.
* WHEN...Until 9 PM PDT Friday.
* 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...Areas of elevated smoke and haze are expected
to remain over western Washington through Friday. This could
result in slightly lower temperatures than forecast.
The Southwest Clean Air Agency has issued an Air Quality Advisory,
which is in effect until 1 PM PDT Friday.
An Air Quality Advisory for Smoke has been issued. Wildfires burning in
the region will cause air quality to reach unhealthy levels due to smoke
at times through 1 PM PDT Friday.
Pollutants in smoke can cause burning eyes, runny nose, aggravate
heart and lung diseases, and aggravate other serious health
problems. Limit outdoor activities and keep children indoors if it
is smoky. Please follow medical advice if you have a heart or lung
condition.
More information about air quality can be found at:
www.orcaa.org
www.swcleanair.gov
www.oregon.gov/DEQ
www.lrapa.org
An Air Quality Alert for smoke has been issued by Southwest Clean
Air Agency until 1 PM PDT Friday. Wildfires burning in the region
will cause air quality to reach unhealthy for sensitive groups
due to smoke.
All sensitive groups should limit spending any time
outdoors. People with health conditions may have worsened symptoms.
Healthy people may start to have symptoms.
Wildfire smoke can cause burning eyes, sore throat, headache,
coughing, wheezing, shortness of breath, and worsening of heart
and lung conditions.
For current current air quality conditions, health precautions,
and additional information on wildland fire smoke, visit the
Southwest Clean Air Agency website at swcleanair.gov or the
Washington Smoke Blog at http://wasmoke.blogspot.com. You may also
contact your local air quality agency.
* WHAT...Hot conditions with temperatures in the upper 80s to low
90s expected. This will pose a moderate to isolated major risk of
heat-related illness.
* WHERE...Portions of northwest and west central Washington.
* WHEN...Until 9 PM PDT Friday.
* 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 in the upper 80s expected.
This will pose a moderate risk of heat-related illness.
* WHERE...Lower Chehalis Valley Area and Southwest Interior.
* WHEN...Until 9 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.
The National Weather Service in Seattle has issued a Red Flag
Warning for thunderstorms and gusty outflow winds, which is in
effect from 10 AM Friday to midnight PDT Friday night.
* AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North
Cascades Generally above 1500 Feet.
* THUNDERSTORMS...Scattered thunderstorms are expected over the
North Cascades with LAL of 3 during the afternoon and evening
hours.
* 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.
The Yakima Regional Clean Air Agency has issued an Air Quality
Alert...IN EFFECT UNTIL FURTHER NOTICE.
A Smoke Air Quality Alert has been issued. Wildfires burning in the
region combined with forecasted conditions will cause air quality to
reach unhealthy levels.
Pollutants in smoke can cause burning eyes...runny nose...aggravate
heart and lung diseases...and aggravate other serious health
problems. Limit outdoor activities and keep children indoors if it
is smoky. Please follow medical advice if you have a heart or lung
condition.
Information about air quality is on the Washington Department of
Ecology Web site at http://www.ecy.wa.gov/air.html or call 360-407-
6000.
* WHAT...Hot conditions with temperatures in the upper 80s to low
90s expected. This will pose a moderate to isolated major risk of
heat-related illness.
* WHERE...Portions of northwest and west central Washington.
* WHEN...From noon Thursday to 9 PM PDT Friday.
* 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...Areas of elevated smoke and haze are expected
to move over western Washington Thursday and Friday. This could
result in slightly lower temperatures than forecast.
