North and East Texas are under a Heat Advisory with predictions of heat index values up to 108 and temperatures up to 104, warning of potential heat-related illnesses.

Phoenix, AZ, is set for a heatwave with sunny days and temperatures peaking around 111 degrees, and minimal respite at night. Some chances of showers are expected Thursday evening.

Chicago experiences heavy rain with an 80% chance of showers, possible flash floods, and severe weather warnings, including damaging winds. Temperatures to drop with cooler air incoming.

Miami's weather forecast includes sun, light showers, high heat with index values up to 103 degrees, and typically humid evenings. A plume of Saharan dust may increase rain chances over the weekend.

Pittsburgh is experiencing a heat wave with high humidity and temperatures in the 90s, prompting a Heat Advisory. Fog has reduced visibility, and a cold front is expected to bring relief with cooler temperatures and potential rain later in the week.

Boston faces a hot day with heat indexes nearing 100 degrees, per National Weather Service, though coastal areas may stay cooler. Thunderstorms may miss the city, and a more predictable sunny weekend is ahead.

The NWS warns of high heat in East Tennessee, with advisories for heat illnesses and upcoming thunderstorms with potential flash flooding and gusty winds.

A heatwave in Orlando prompts a Heat Advisory with temperatures potentially hitting 112°F. Despite high heat, rain chances could provide relief, and a weekend weather front may slightly cool temperatures.

Philadelphia faces a heat advisory with index values up to 104 degrees; residents are told to stay cool, limit outdoor activity, and watch out for health risks. An air quality alert is also in effect for sensitive groups.

The NWS issued a Heat Advisory in Indianapolis for high heat index values, cautioning against heat-related illnesses and advising precautions. Later, potential severe thunderstorms and weather instability are expected.

NWS warns of continued high heat in Ohio, Kentucky, and Indiana with a heat advisory in effect; isolated storms possible with a cold front bringing cooler temperatures and rain later on.

Cleveland's weekend weather, shaped by Canadian high pressure, will see cooler temperatures and possible isolated storms, with clearer and cooler conditions expected as the week progresses.

The National Weather Service predicts hot conditions for Baltimore today, with severe thunderstorms and potential flash flooding by Thursday, followed by cooler temperatures over the weekend.