Forecast discussion: A high pressure ridge brought sunshine to Providence on Friday, along with some windy conditions early in the day. But, that ridge will begin to weaken this evening, as we watch a couple of low pressure systems in the Midwest U.S. work their way up towards the Northeast U.S. for tomorrow. In fact, a Winter Storm Watch is in effect for parts of Norfolk, Plymouth, and Bristol Counties starting at 10 AM Saturday morning until 7 AM Sunday morning. Boston will be under a Winter Weather Advisory from 10 AM to 7 AM Sunday.
We will begin to see increasing clouds by sunrise, as moisture from the system begins to infiltrate our atmosphere. Based on the latest computer models, I’m expecting to see the first snowflakes to fall during mid-morning. We should see some light snowfall by noon. Based on the track of a secondary low along the coastline, we will see some heavier snowfall during the evening and overnight hours. As the move through early Sunday morning, the low’s center will continue to move further northeast, with some remnant snow showers by sunrise. All precipitation should end by mid-morning on Sunday, with some sunshine expected Sunday afternoon. Since the low’s track has not changed since last night’s forecast, I’m expecting 3-5 inches to fall in the capital city, including along the Mass Pike into Glocester. Along the south Cape and Islands, we will see more of a mix of rain and snow, so I’m calling for 1-3 inches. South of Boston into Plymouth County will see the most snowfall, at 4-7 inches.
You may want to keep up with local television stations to see if your city or town will have a parking ban in effect. Also, take precaution if you do have to travel during the storm, as streets may become icy and visibility may be low due to moderate snow.
By Sunday night, high pressure over the Central U.S. will move over us, but it will bring polar air down from the Arctic. Temperatures Sunday night will be in the upper teens, with wind chills making it feel like the lower teens. As we approach New Year’s Eve night, it will be quite cold if you are attending First Night, as lows will be approaching the middle teens for midnight. Also, a weak Alberta Clipper may bring some brief snow showers Tuesday morning. The first few days of 2013 will remain dry but cold as we move into the next weekend.
72 hour forecast:
Tonight: Partly to mostly cloudy with a low of 25.
Saturday: Mostly cloudy with light snow developing in the late morning. Moderate snow expected by sunset. We will see a high of 33, with east-northeast winds of 8-11 mph.
Saturday night: Light to moderate snow with a low of 25. Winds increase from the north-northwest to 13-16 mph.
Sunday: Snow showers end by sunrise, with bright sunshine in the afternoon. I’m expecting 3-5 total inches of snow in Boston. We will see a high of 33.
Sunday night: Partly cloudy and very cold with a low of 17.
Monday: Mostly sunny with a high near 33.
Monday night: Partly to mostly cloudy with a low of 23.
New Year’s Day: Mostly cloudy with possible morning snow showers. Highs 32-35, lows 13-16.
Wednesday: Partly sunny. Highs 26-29, lows 16-19.
Thursday: Mostly sunny. Highs 29-32, lows 14-17.
Friday: Mostly sunny. Highs 27-30, lows 15-18.