Boston gets a wet, foggy start to September, with heavy rain possible and localized flooding concerns. A quieter Wednesday leads into another stormy turn Thursday.

Baltimore's hottest day arrives Tuesday, with a 94-degree high and a 101-degree heat index before storm chances rise this week.

Jacksonville faces afternoon storms, heat indexes near 100 and a wetter forecast through Labor Day.

Atlanta’s sunny stretch is bringing mid-90s heat through the workweek, with the heat index reaching 101 Wednesday. Storm chances finally return this weekend.

New York City starts Tuesday in fog and humidity before potentially severe thunderstorms move in by the afternoon. A much drier holiday weekend is ahead.

Portland hits 85 Monday before rain, wind and thunderstorm chances take over midweek.

Phoenix faces a stormy Monday with flood concerns before sunny skies and triple-digit heat return Tuesday.

A tramway camera atop Mount San Jacinto caught the silent flashes, a trick of elevation and desert monsoon physics.

Seattle gets one more sunny day Monday before rain arrives late Tuesday and lingers through Thursday. Cooler, unsettled weather is headed into the weekend.

A bright flash near 8:50 p.m. Sunday sent dozens of reports to the American Meteor Society across Washington and Oregon.

A Heat Advisory begins Monday as Kansas City heads toward 100 degrees and heat indexes up to 103. Warm nights will offer little relief through Wednesday.

Greenville’s start gives way to a week of dangerous heat, with highs reaching the mid- to upper-90s before storms arrive Friday.

A Stanford study shows seniors reach dangerous heat limits at temperatures 8.5 to 13.5 degrees lower than younger adults.