"Steamy" is today's highly technical weather word. A thick layer of very humid air has settled in across the East Coast, pushing dew point temperatures into the mid 70s across the city. Dew points that high mean our bodies can't cool by evaporation, making it feel much warmer than the expected high in the mid 80s.
Along with the extreme humidity and warm weather a cold front is headed our way this afternoon. That combination, plus an upper level trough, is likely to result in a couple of lines of strong to severe thunderstorms. Heavy rains, flash flooding, and damaging winds are possible from these storms and we can't totally discount the chance of hail or the threat of tornado development. The entire area, save for eastern Long Island is now in a severe thunderstorm watch.
Much drier air will arrive tomorrow behind the front. Tuesday's high will be in the mid 80s under mostly sunny skies. Wednesday and Thursday should be mild, with highs in the lower 80s. An upper-level disturbance could cause a few clouds or showers on Wednesday but Thursday looks to be sunny.
The forecasts get a bit fuzzier toward the weekend, but it generally looks like some humidity will return with scattered showers and thunderstorms through Sunday. A potential wild card is what becomes of the tropical system that is likely to develop in the Gulf of Mexico this week. At least one model has the remains of that system passing pretty close to us on Sunday, but it is way too early to have confidence in that path.