Portland, ME Warnings, Watches and Advisories

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 Portland.

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

Air Quality Alert issued July 15 at 2:48PM EDT by NWS Caribou ME

The Maine Department of Environmental Protection's Bureau of Air Quality has issued an Air Quality Alert for particle pollution until midnight EDT Wednesday night. Particle pollution levels are expected to rise into the Unhealthy for Sensitive Groups range on Tuesday. Values are already in the USG range this morning. Smoke is currently expected to not move out of Maine until Thursday, though this denser portion of the plume should move out by Thursday. In addition, particle pollution levels are expected to be moderate for the remainder of the state while ozone level are expected in the moderate range for the Maine coastal regions. The Maine Department of Environmental Protection recommends that individuals consider limiting strenuous outdoor physical activity to reduce the risk of adverse health effects. People who may be especially sensitive to the effects of elevated levels of pollutants include the very young, the elderly, those with pre-existing respiratory problems such as asthma, those with heart disease and anyone who is working hard outdoors. But if you experience symptoms such as shortness of breath, coughing, throat irritation or an uncomfortable sensation in your chest please consider limiting the intensity and duration of your outdoor activities. A toll free air quality hotline has been established so Maine residents can stay informed on the air quality situations. The toll free number is: 1-800-223-1196. Additionally the Maine Department of Environmental Protection has the air quality forecast available on the web at www.maine.gov/dep/air/aqforecast.

Heat Advisory issued July 15 at 1:33PM EDT until July 16 at 8:00PM EDT by NWS Gray ME

* WHAT...Heat index values up to 97 expected. * WHERE...In Maine, Interior York County. In New Hampshire, Strafford County. * WHEN...From 11 AM to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Humidity will continue to build Thursday, with greater coverage of high heat index values.