Forecast discussion: High pressure over Wisconsin at the moment brought a strong ridge over Southern New England on Saturday. This allowed Boston to see sunny skies by the late morning, but with slightly below normal temperatures. Over the next 36 hours, we will be seeing a little bit of every kind of winter precipitation, before cold temperatures hit the region by the middle of the week.
At this time, the strong ridge will protect us for tonight. We will begin to see some moisture move up from the south into Southern New England by Sunday afternoon. A weak area of low pressure forming in South Carolina will ride up the coastline during the day. A stronger low will form near the Ohio River Valley, and become the primary low.
The primary low will bring us some light snow showers early Monday morning. However, some warmer air in the lower levels of the atmosphere will help change the snow showers to some sleet and possibly freezing rain before dawn. So, this will make for some treacherous driving during the morning commute. So, please give yourself extra time to make it to work or school. The wintry mix will change back to plain rain by noon, before we end as some rain showers around midnight. There is a slight chance we could see some scattered snow showers during the daytime hours on Tuesday, as some leftover energy from the low hangs right off the east coast.
By Tuesday night, a strong high pressure system from the Rockies will come down into the Southwest U.S. before moving east. This high will dominate our weather for the remainder of the week. However, we will also feel the coldest air of the season, as daytime highs stay below or near freezing. Overnight lows will reach the upper teens to lower 20’s. Looking well into the future, the American model wants to develop a Nor’easter type system next Sunday, with possible light snow to fall next Monday. However, my overall confidence is very low, as this is almost eight days out in the future, and the computer model is not very accurate the further you go into time.
72 hour forecast:
Tonight: Partly cloudy and cold with a low of 24.
Sunday: Partly sunny by the morning, with overcast skies by the early afternoon. We will see a high of 34 with northwest winds of 5-8 mph.
Sunday night: Light snow starting around 3 a.m. but quickly mixing with sleet and freezing rain. We will see a low of 29 with east-northeast winds of 6-9 mph.
Monday: A mix of sleet, snow, and freezing rain through noon before changing to all rain. We will see a high of 42.
Monday night: Showers end by around midnight, but remaining mostly cloudy. We will see a low of 32.
Tuesday: Partly sunny in the morning with possible snow showers during the late morning to mid-afternoon hours and a high of 37.
Tuesday night: Partly cloudy with a low of 23.
Wednesday: Mostly sunny. Highs 30-33, lows 16-19.
Thursday: Mostly sunny. Highs 26-29, lows 16-19.
Friday: Partly sunny. Highs 27-30, lows 20-23.
Saturday: Partly to mostly sunny. Highs 29-32, lows 18-21.