Markham, WA Warnings, Watches and Advisories

When a severe thunderstorm warning is issued, the storm may produce damaging winds, large hail, dangerous lightning, and heavy rain. In some cases, heavy rainfall produced by a severe storm can also lead to flash flooding. Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Markham.

Use the Radar Maps link provided to understand the trajectory of a storm.

Heat Advisory issued July 21 at 3:19PM PDT until July 22 at 11:00PM PDT by NWS Seattle WA

* WHAT...Hot conditions with high temperatures in the mid to upper 90s expected and low temperatures from 60 to 65 degrees. This will pose a major risk of heat-related illness. * WHERE...Eastern Kitsap County, City of Seattle, Downtown Everett / Marysville Area, Eastside, Foothills and Valleys of Central King County, Foothills and Valleys of Pierce and Southern King Counties, Foothills and Valleys of Snohomish and Northern King Counties, Lowlands of Pierce and Southern King Counties, and Shoreline / Lynnwood / South Everett Area. * WHEN...Until 11 PM PDT Wednesday. * 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. * ADDITIONAL DETAILS...Areas immediately along the water will experience cooler daytime high temperatures.

Heat Advisory issued July 21 at 3:19PM PDT until July 22 at 11:00PM PDT by NWS Seattle WA

* WHAT...Hot conditions with high temperatures in the upper 80s to lower 90s and low temperatures around 60 degrees. This will pose a moderate risk of heat-related illness. * WHERE...Eastern Strait of Juan de Fuca, Foothills and Valleys of the North Cascades, Lake Crescent Area Including US 101, Lowlands of Western Skagit and Northwestern Snohomish Counties, Lowlands of Western Whatcom County, Northern Hood Canal, and Port Townsend Area. * WHEN...Until 11 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. * ADDITIONAL DETAILS...Areas closest to the water will experience cooler daytime high temperatures.

Heat Advisory issued July 21 at 3:19PM PDT until July 22 at 11:00PM PDT by NWS Seattle WA

* WHAT...Hot conditions with high temperatures in the 90s to near 100 degrees and low temperatures in the mid 60s. This will pose a major risk of heat-related illness. * WHERE...Foothills of the Western and Southern Olympic Peninsula, Middle Chehalis River Valley, Southern Hood Canal, Foothills and Valleys of Thurston and Lewis Counties, Lowlands of Lewis and Southern Thurston Counties, and Olympia and Southern Puget Sound. * WHEN...Until 11 PM PDT Wednesday. * 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.

Fire Weather Watch issued July 21 at 1:55PM PDT until July 23 at 2:00PM PDT by NWS Seattle WA

The National Weather Service in Seattle has issued a Fire Weather Watch for lightning and gusty outflow winds, which is in effect from Wednesday afternoon through Thursday afternoon. * AFFECTED AREA...Fire Weather Zone 655 Black Hills and Southwest Interior Lowlands and Fire Weather Zone 659 West Slopes of the Central Cascades Generally above 1500 Feet. * LIGHTNING...Isolated to scattered thunderstorm coverage is possible across the southern Cascade Mountains and portions of southwest Washington. Thunderstorms will develop late Wednesday night and move from south to north across the area. * OUTFLOW WINDS...Any storms that develop will be capable of gusty and erratic outflow winds between 25 and 30 miles per hour. 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.

Air Quality Alert issued July 21 at 12:16PM PDT by NWS Spokane WA

An Air Quality Alert has been issued by the following agencies: Washington Department of Ecology Spokane Regional Clean Air Agency An Air Quality Alert continues for Spokane, Ferry, Lincoln, Okanogan, Pend Oreille, and Stevens Counties, effective immediately through Wednesday, July 22nd at 9 AM, due to current and expected wildfire smoke from regional fires. Particulate matter (PM2.5) levels are expected to range in the Unhealthy for Sensitive Groups and Unhealthy categories. In Eastern Okanogan County near active wildfires, air quality may reach Very Unhealthy to Hazardous levels. When air quality is Unhealthy, everyone should reduce exposure. Limit time outside, avoid strenuous activity, and follow tips for cleaner indoor air.

Heat Advisory issued July 21 at 11:44AM PDT until July 23 at 9:00PM PDT by NWS Spokane WA

* WHAT...Hot temperatures with daytime highs in the 90s Tuesday and mid 90s to near 100 Wednesday and Thursday. This will pose a moderate to major risk of heat-related illness. * WHERE...Portions of North and North Central Idaho and Central, East Central, North Central, Northeast, and Southeast Washington. * WHEN...Until 9 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Wednesday will likely be the hottest day with widespread moderate and major HeatRisk. Limited overnight relief expected across the lower elevations Wednesday and Thursday mornings with low temperatures in the mid 60s to mid 70s.

Heat Advisory issued July 21 at 10:47AM PDT until July 22 at 11:00PM PDT by NWS Portland OR

* WHAT...High temperature today of 95 to 98 degrees F. * WHERE...South Washington Cascade Foothills. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Smoke from fires outside of the region or clouds moving into the area could result in cooler daytime high temperatures than currently forecast. Around a 10-15% chance of thunderstorms on Wednesday afternoon which may increase cloud cover and thus cause temperatures to be slightly lower than forecast.

Heat Advisory issued July 21 at 10:47AM PDT until July 22 at 11:00PM PDT by NWS Portland OR

* WHAT...High temperatures up to 100. * WHERE...Greater Portland/Vancouver Metro, Western and Central Columbia River Gorge and the Hood River Valley, Lower Columbia River and Cowlitz River Valleys, and Central Willamette Valley. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Smoke from fires outside of the region or clouds moving into the area could result in cooler daytime high temperatures than currently forecast. Around a 10-15% chance of thunderstorms on Wednesday afternoon which may increase cloud cover and thus cause temperatures to be slightly lower than forecast.

Heat Advisory issued July 21 at 6:14AM PDT until July 23 at 9:00PM PDT by NWS Pendleton OR

* WHAT...Hot conditions with temperatures up to 100 to 103 degrees expected, with 101 to 105 degrees in the Columbia Basin. This will pose a moderate to major risk of heat-related illness. * WHERE...Eastern Columbia River Gorge of Oregon and Washington, Lower Columbia Basin of Oregon and Washington, Foothills of the Northern Blue Mountains of Oregon, Yakima Valley, and Foothills of the Blue Mountains of Washington. * WHEN...From 11 AM this morning to 9 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...The heat will begin today, with widespread moderate and locally major HeatRisk. Wednesday looks to be the hottest day, with Major HeatRisk across the Columbia Basin, Yakima Valley and portions of the Gorge and Blue Mountain Foothills. Thursday will also see widespread moderate HeatRisk and locally major HeatRisk, mainly across the Columbia Basin. Smoke from area wildfires could end up affecting how hot temperatures get.

Air Quality Alert issued July 20 at 7:40PM PDT by NWS Pendleton OR

The Washington State Department of Ecology, Benton Clean Air Agency, have issued an Air Quality Alert until 9 AM PDT Wednesday. For the Smoke Air Quality Alert, 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 from the Washington Department of Ecology web site is available at http://www.ecy.wa.gov/air.html or call 360-407-6000. Information from the Benton County Clean Air Agency web site is available at http://www.bentoncleanair.org or call 509-783-1304.

Air Quality Alert issued July 20 at 6:03PM PDT by NWS Pendleton OR

The Washington State Department of Ecology and Benton Clean Air Agency have issued an Air Quality Alert until 9 AM PDT Wednesday. For the Dust Air Quality Alert, forecasted winds may carry large amounts of dust causing 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 from the Washington Department of Ecology web site is available at http://www.ecy.wa.gov/air.html or call 360-407-6000. Information from the Benton County Clean Air Agency web site is available at http://www.bentoncleanair.org or call 509-783-1304.

Air Quality Alert issued July 20 at 1:46PM PDT by NWS Pendleton OR

The Washington State Department of Ecology and/or the Yakima Regional Clean Air Agency has issued an Air Quality Alert until 9 AM PDT Wednesday. For the Smoke Air Quality Alert, 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 from the Washington Department of Ecology Web site is available at http://www.ecy.wa.gov/air.html or call 360-407-6000.Information about air quality is on the Yakima Regional Clean Air Agency Web site at http://www.yakimacleanair.org or call 509-834-2050.

Air Quality Alert issued July 20 at 12:48PM PDT by NWS Seattle WA

An Air Quality Alert has been issued by the Northwest Clean Air Agency until 9 AM PDT Wednesday. An Air Quality Alert has been issued for Skagit and Whatcom Counties, effective immediately through Wednesday July 22nd at 9am due to expected wildfire smoke from Canadian wildfires. Particulate matter (PM2.5) levels may reach Unhealthy for Sensitive Groups. When air quality is Unhealthy for Sensitive Groups, sensitive groups should take steps to reduce exposure. Limit time outside, avoid strenuous outdoor activity, and follow tips for cleaner indoor air. Everyone should watch for symptoms as a sign to reduce exposure. For current air quality conditions and additional information visit https://nwcleanairwa.gov

Air Quality Alert issued July 20 at 12:03PM PDT by NWS Spokane WA

An Air Quality Alert has been issued by the following agencies: Washington Department of Ecology Spokane Regional Clean Air Agency An Air Quality Alert has been issued for Spokane, Ferry, Lincoln, Okanogan, Grant, Pend Oreille, and Stevens Counties, effective immediately through Wednesday, July 22nd at 9 AM, due to current and expected wildfire smoke from regional fires. Particulate matter (PM2.5) levels are expected to range in the Unhealthy for Sensitive Groups and Unhealthy categories. In Eastern Okanogan County near active wildfires, air quality may reach Very Unhealthy to Hazardous levels. When air quality is Unhealthy, everyone should reduce exposure. Limit time outside, avoid strenuous activity, and follow tips for cleaner indoor air.

Air Quality Alert issued July 20 at 11:59AM PDT by NWS Spokane WA

An Air Quality Alert has been issued by the following agencies: Washington Department of Ecology Spokane Regional Clean Air Agency An Air Quality Alert has been issued for Spokane, Ferry, Lincoln, Okanogan, Pend Oreille, and Stevens Counties, effective immediately through Wednesday, July 22nd at 9 AM, due to current and expected wildfire smoke from regional fires. Particulate matter (PM2.5) levels are expected to range in the Unhealthy for Sensitive Groups and Unhealthy categories. In Eastern Okanogan County near active wildfires, air quality may reach Very Unhealthy to Hazardous levels. When air quality is Unhealthy, everyone should reduce exposure. Limit time outside, avoid strenuous activity, and follow tips for cleaner indoor air.

Air Quality Alert issued July 20 at 10:43AM PDT by NWS Spokane WA

An Air Quality Alert has been issued by the following agencies: Spokane Regional Clean Air Agency Washington Department of Ecology An Air Quality Alert has been issued for Spokane, Ferry, Lincoln, Okanogan, Pend Oreille, and Stevens Counties, effective immediately through Wednesday, July 22nd at 9 AM, due to current and expected wildfire smoke from regional fires. Particulate matter (PM2.5) levels are expected to range in the Unhealthy for Sensitive Groups and Unhealthy categories. In Eastern Okanogan County near active wildfires, air quality may reach Very Unhealthy to Hazardous levels. When air quality is Unhealthy, everyone should reduce exposure. Limit time outside, avoid strenuous activity, and follow tips for cleaner indoor air.

Air Quality Alert issued July 20 at 10:23AM PDT by NWS Seattle WA

An Air Quality Alert has been issued by the Northwest Clean Air Agency until 9 AM PDT Wednesday. An Air Quality Alert has been issued for Skagit and Whatcom Counties, effective immediately through Wednesday July 22nd at 9am due to expected wildfire smoke from Canadian wildfires. Particulate matter (PM2.5) levels may reach Unhealthy for Sensitive Groups. When air quality is Unhealthy for Sensitive Groups, sensitive groups should take steps to reduce exposure. Limit time outside, avoid strenuous outdoor activity, and follow tips for cleaner indoor air. Everyone should watch for symptoms as a sign to reduce exposure. For current air quality conditions and additional information visit www.nwcleanairwa.gov