Heat will be the main weather story on Thursday as air temperatures reach into the mid-90s and dewpoints peak in the mid-70s, combining for heat indices that could approach 110-115° in the afternoon. This has prompted an Excessive Heat Watch from noon-8PM, when heat indices could be highest. If the forecast indicates heat indices approaching or exceeding 113°, this could be upgraded to an Excessive Heat Warning; otherwise, a Heat Advisory would likely be the move barring an unexpected cooler start (like we saw today, in fact!)
Showers and thunderstorms will be possible in the afternoon and evening hours as the seabreeze pushes inland. We could also see storms coming our way from the Midlands once again as well. Widespread severe weather is not expected, but you can never rule out a damaging wind gust or two this time of year.
High pressure building in aloft will turn on the heat and keep storms at bay for the rest of the work week. After reaching 93° on Tuesday, we should reach well into the mid-90s for the next few days. Dewpoints surging back into the mid-to-upper 70s will drive heat indices back into Advisory territory possibly as early as Wednesday and more likely on Thursday and Friday. Be ready to take heat precautions once again as you head outside at the height of the afternoons.
Looking for relief from storms? Don’t count on it — the high pressure aloft will generally put a lid on much in the way of thunderstorm activity. If one can get going, then you might get some heavy rain and gusty winds, but otherwise, widespread storm activity doesn’t appear likely until next week.
Well, the respite is decidedly over: we’re back to 100°+ heat indices on Tuesday as surface high pressure shifts offshore and higher-dewpoint air returns to the area. We start the day in the low 70s one more time, but will warm quickly into the 80s by mid-morning and should be back in the 90s by early afternoon. Dewpoints look to climb into the mid-70s throughout the day, and this will yield heat indices around 103° — hot to be sure, but shy of advisory criteria. Scattered showers and thunderstorms are primarily expected in the afternoon and evening hours, though a few showers can’t be ruled out in the morning. A few showers may try to get going on the seabreeze, but high-resolution guidance suggests that the bulk of any activity will get going perhaps in the Midlands and Upstate before dropping southeasterly into the metro. Some heavy rain is possible, and a damaging wind gust or two is not out of the question, either. Keep an ear out for possible warnings Tuesday evening, just in case.
After a really nice Sunday that featured dewpoints dropping into the low 60s and no rain to speak of, we get one more day of lower humidity before we return to the swamp for the rest of the upcoming week. For Monday, though, enjoy lows around 70° yielding to highs around 90° in the afternoon with dewpoints generally in the mid-60s. We’ll see a mix of sun and clouds throughout the day, but rain should just hold off to our west for one more day. (Can’t rule out some showers near I-95, though.)