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ESFRIW A wet weather system will support periods of showers and thunderstorms across Wyoming Friday, Saturday, and Sunday. This weather system is funneling abundant tropical moisture into the state. Given this anomalously high moisture, many thunderstorms will feature heavy rainfall, possibly leading to localized flooding. Poor drainage areas, urban areas, and steep terrain will be the most susceptible locations for this isolated flooding. Many locations could see rainfall totals anywhere between 0.75" to

ESFAFG ...Locations Impacted... Upper Kuskokwim Valley River levels on the Kuskokwim River at McGrath may still rise this afternoon in response to the heavy rain earlier this week. The Kuskokwim has leveled out around 18.5ft as of 6 AM AKDT Friday morning, there is a chance for it to rise back up to near bankfull later today or tonight. If the river looks to drop, this will be the last update.

AQAMEG The Shelby County Health Department has issued a Code Orange Ozone Forecast effective for Shelby County Tennessee, Crittenden County Arkansas, and DeSoto County Mississippi, including the city of Memphis for today. This ozone forecast is due to forecasted ozone values that will be unhealthy for sensitive groups. These values will exceed the Environmental Protection Agency's federal safe health standard. The Shelby County Health Department recommends that

AQAMEG The Shelby County Health Department has issued a Code Orange Ozone Forecast effective for Shelby County Tennessee, Crittenden County Arkansas, and DeSoto County Mississippi, including the city of Memphis for Friday. This ozone forecast is due to forecasted ozone values that will be unhealthy for sensitive groups. These values will exceed the Environmental Protection Agency's federal safe health standard. The Shelby County Health Department recommends that

AQAMEG The Shelby County Health Department has issued a Code Orange Ozone Health Advisory effective for Shelby County Tennessee, Crittenden County Arkansas, and DeSoto County Mississippi, including the city of Memphis that will remain in effect until sunset. This ozone health advisory is due to monitored ozone values that are unhealthy for sensitive groups. These values have exceeded the Environmental Protection Agency's federal safe health standard. The Shelby County

AQAFWD The Texas Commission on Environmental Quality (TCEQ) has issued an Ozone Action Day for the Dallas-Fort Worth area for Friday, September 18, 2026. Atmospheric conditions are expected to be favorable for producing high levels of ozone air pollution in the Dallas-Fort Worth area on Friday. You can help prevent ozone pollution by sharing a ride, walking, riding a bicycle, taking your lunch to work, avoiding drive-through lanes, conserving energy, and keeping your vehicle properly tuned.

The St. Louis Clean Air Partnership has issued an air quality alert for the St. Louis metropolitan area from 10 AM to 8 PM CDT Friday. An Orange air quality forecast means that maximum ozone concentrations are expected to reach levels that pose a health risk. Adverse health effects increase as air quality deteriorates. Ground- level ozone is an air contaminant which can cause breathing difficulties for children, older adults, as well as persons with respiratory problems.

AQAFFC The Georgia Department of Natural Resources, Environmental Protection Division has issued a Code Orange (Unhealthy for sensitive groups) Air Quality Alert for Atlanta for Friday September 18. Under Code Orange conditions, the outdoor air quality is likely to be unhealthy for some people. Children, people who are sensitive to ozone, and people with heart or lung disease should limit prolonged outdoor exertion during the late afternoon or early evening when ozone concentrations are highest.

ESFLOT Several rounds of showers and thunderstorms are possible starting late Friday night and continuing into Monday across southern Wisconsin, northern Illinois, and part of northwestern Indiana. High moisture content in the atmosphere will lead to torrential downpours where thunderstorms are most frequent, leading to the potential for several inches of rain on a widespread basis. The favored area for several rounds of showers and thunderstorms