It was a nice couple days of heat indices “only” in the upper 90s to low 100s, but we return to Advisory-level heat on Sunday as air temperatures in the mid-90s combine with dewpoints in the mid-to-upper 70s to yield heat indices 108-110°. Once again, you’ll want to be sure your outdoor activities involve frequent breaks in the shade with plenty of water.

Those outdoor activities may become disrupted as we get into the afternoon and evening hours as thunderstorms begin to fire along and ahead of the seabreeze. Coverage should increase as the evening goes on as a disturbance aloft swings by. Scattered to numerous showers and thunderstorms will be possible with some periods of locally heavy rain and cloud-to-ground lightning. A few stronger storms could produce sporadic damaging wind gusts, so be alert for possible severe weather warnings as well. Regardless of the severity of the storms, lightning makes every thunderstorm dangerous. If you can hear thunder, you’re close enough to be struck by lightning, so move those outdoor activities inside if a thunderstorm approaches your location. Most of the activity should disperse as we get later into Sunday night, though some could hang around with the energy aloft and an approaching front.

We’ll want to keep an eye on Monday for the potential for some flooding as slow-moving showers and storms should fire on that aforementioned front as it stalls out across the area. I’ll have more on that risk tomorrow as more data rolls in.