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High humidity sparks mid-week storms

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Higher humidity was featured on Tuesday, and it will continue through the middle of the week. A cold front coming through early Thursday means something has to give. Typical summertime thunderstorms are in the forecast for Long Island.

Humidity was "in check" on Monday, leading to a beautiful day with temps just into the 80s and lots of sun. By Tuesday morning, dewpoints had risen into the 60s, as opposed to being near 60 Monday. This meant higher humidity levels, and it was noticeable by mid-day. The strong summer sun led to a pretty warm day on Tuesday. The high humidity sticks around for Wednesday and highs once again reach the 80s Islandwide.

A cold front approaching from the west will lead to instability along and just ahead of it. As it creeps towards Long Island, the chance for thunderstorms will increase by late in the day Wednesday. However, it seems most of the action initially will be north and west of New York City. Into Wednesday night, however, all bets are off. Some model guidance paints a wet, stormy picture by Thursday morning. The front comes through late in the morning, but not without leaving a little instability behind it, leading to a continued chance of a late day storm.

After this clears, humidity levels noticeably drop, leading to a great stretch of weather for about 48 hours. Friday and Saturday look sunny and wonderful. The long-range forecast includes an increasing chance of wet weather by the end of the weekend with a brief spurt of tropical moisture.

In addition, the tropics shook off its quiet run, adding Tropical Depression Two to the list of this year's storms. As of Tuesday evening, nothing may seem to come of it as it approaches the Lesser Antilles. Dry air and shear will kill it, but there is still a rain threat for parts of the eastern Caribbean this week.

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