1:50 PM: Very Hot And Humid, Heat Index Over 100
With an unseasonably warm and very humid air mass, along with mostly sunny skies, temperatures warmed up into the low 90s away from the coast, so far getting as high as 93 degrees in Newark, NJ and LaGuardia, with 94 degrees in Central Park. Dew points, however, are higher than forecast, and are currently in the mid 70s for most of the area, reaching as high as 77 degrees in Montgomery, NY. These dew points are unusually high for a sunny, hot day for any time of the year, especially for September. As a result, heat index values are higher than forecast, and are in the 100-105 degree range across most of NYC, northern NJ and southeast NY, peaking at 105 near Newark.
Additional slight warming is forecast over the next few hours until the temperature increase stops later this afternoon as cloud cover spreads into the area associated with developing strong to locally severe thunderstorms over Pennsylvania. These storms should stay mostly, if not entirely to the north and west of the area, perhaps affecting northwestern parts of the area (NW NJ, SE NY) this evening, with otherwise increasing cloud cover and continued mild and humid conditions tonight, with lows only falling into the low to mid 70s. The cold front will affect the area tomorrow with widespread thunderstorms, possibly strong inland, towards the late afternoon, evening and early overnight hours, with highs possibly reaching the low 90s again in northeast NJ with heat index values in the mid-upper 90s possible.
Another brief update may be posted this evening, with the next full forecast discussion and updated 5-day forecast to be posted on Thursday morning. Storm updates, if necessary, will be posted on Twitter.