Sep 9, 2015 12:22 AM
Weather Insider: Wednesday September 9, 2015
NH1 Chief Meteorologist
A warm front has lifted north of New Hampshire with warm SW winds remaining in place for Wednesday. Mostly sunny skies will help to heat temperatures back into the upper 80's and Lwr 90's by afternoon. With dewpoints hovering in the 60's and Lwr 70's, temps will feel in the mid 90's for a brief time Wednesday afternoon. A good day for the AC or swimming the lake or ocean. A cold front will approach late in the day. This cold front will be a trigger for scattered showers and thunderstorms to form between 5-9 PM Wednesday from west to east. Because of the available energy of heat and humidity ahead of this frontal passage, there will be the potenial for scattered strong/severe storms during this time.
The cold front will be slowing and stalling over New England, or just off the coast Thursday, as upper level winds begin to shift to the SSW. This will help to keep a lot of clouds around Thursday with a cooler feel with highs in the upper 70's and Lwr 80's. Another round of showers will likely begin to ride up along this stalled front with showers developing in the afternoon. A wave of low pressure will develop along this front and bring in a steady period of rain, with downpours and embedded storms for Thursday night. There will be the potential for some areas to pick up over 1" of rain in this heavy rain event so there will be the potential for some localized flooding.
The low will begin to pull away early Friday, taking the heavy rain along with it. Still with mostly cloudy skies and NNE winds...Highs will only be in Lwr 70's and a little cool for this time of year. Weak high pressure follows in for Saturday with sunny to partly sunny skies and highs in the mid 70's. But with the front stalled off the coast with a digging trough across the eastern US, another weak wave of low pressure will be shifting up the coast Saturday night. Showers will be arriving for later Saturday night & Sunday morning. Today the showers are looking light...but the intensity and timing of these showers can and will change as we get closer to the event. Sunday afternoon afternoon will be drier, but NE winds will likely keep temps in the 60's.
Another question is does another wave of low pressure come up the coast for a period of more showers Monday night or early Tuesday? We'll see. Obviously, we have enough on our plate from now into the weekend. Unfortunately, sometimes to break down a heat wave it comes with a cost. What we have here is cooler fall like air wanting to return to the Northeast, and a heat ridge which does not want to break down. So this is what we get...periodic showers, plenty of clouds with a stalled front in the close proximity to us. Again, there will be changes so stay tuned to NH1 for the latest information so you can plan your day or weekends.