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Boston weather: Wet, cool and breezy Wednesday, improving conditions Thursday

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Metro Boston, North Shore and Metro West: The Wednesday morning map features low pressure located in New Jersey with another low situated in southeast Ontario. The low in New Jersey is forecast to track slowly across southern most New England during the day to near Boston early Wednesday night. Brace yourself for an ugly day of weather, especially given this is August, as a potent storm system brings us heavy rain, gusty winds, coastal splash over potential and localized flash flooding of low lying and poor drainage areas due to the expected heavy rain.

It was mentioned the other day that our temperatures have struggled to reach normal on many days so far this month. With an average high of near 81 degrees in the Boston area it is very likely that we do not reach that number in the temperature department until this weekend, perhaps not until Sunday.

Earlier in the week it was thought that we had a good chance of widespread severe weather potential for Wednesday, however that threat is now minimal at best in the local area. Points south and southwest of the city have a better chance of a severe storm popping up. With the low passing near Boston the associated warm front will likely be cutoff from reaching the city and points north and west, keeping the severe potential low here. We will not avoid the rain with some embedded pockets of very heavy rain and a chance of a thunderstorm in and around the Boston area. The National Weather Service has issued a Flash Flood Watch until 8 p.m. since there is the potential for rainfall amounts of over an inch an hour with these embedded pockets of rain, with widespread 1 to 3 inch totals throughout the area. Locally, a few spots could realize upwards of 4 inches, especially inland. Temperatures stay cool with highs only around 70 degrees but with increasing dew points it will feel a bit sticky through the day. Southeast winds gusting between 20 and 30 mph along the coastal plain. High tide on the north shore is early in the afternoon and that is when the risk for some splash over along the usual susceptible locales may occur. A Coastal Flood Advisory is in effect from 9 a.m. to 4 p.m. today.

The low will slowly move to a position near the mid Maine Coast by Thursday morning. As the storm pulls away the shower activity will diminish overnight with the coast the last to see the showers come to an end during the early morning hours of Thursday. Lows Wednesday night near 60. Southeast winds become west at 5 to 15 mph.

Thursday, early clouds possible along the coast, otherwise a mostly sunny day unfolds with highs in the 70s. Falling dew points will make for another very comfortable day here in mid August. West winds 8 to 18 mph.

Thursday night: Partly cloudy and cool. Lows 55 to 60, low 60s in Boston.

Friday and Friday night, generally partly cloudy with a risk of a pop up afternoon shower or storm as a disturbance in the upper levels rotates across the area to our north. Highs in the 70s, overnight lows generally 55 to 60, low 60s again in Boston.

High pressure will have pushed into the area by the weekend with the possibility of a cold front passage sometime on Sunday. With that said the weekend shapes up with a mix of clouds and sun, highs 75 to 80 degrees. The down side Sunday, a chance of a few light showers with the frontal boundary in our area.

North Shore beach outlook:

Wednesday: Don’t even bother unless you want to bundle up and take a walk in the rain and wind and watch the pounding surf.

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