Forecast discussion: Well, we had the luck of the Irish with us today in Boston, as a large high pressure system brought some sunshine on St. Patrick’s Day. This high will calm our winds and help clear our skies this evening. But, it will make for some strong radiational cooling, and our temperatures will fall into the upper teens in the capital city.
The high will move offshore on Monday, so we will be losing the sunshine by the afternoon. A combination of low pressure systems will merge their energy and upper level dynamics together, and will bring some snow showers by the end of the evening commute tomorrow night.
As we go into tomorrow night, snow showers will intensify to light to moderate snow, especially after midnight. There may be areas that see an inch an hour of snow at times. This will make for a very messy morning commute Tuesday morning. By mid-morning on Tuesday, the snow will begin to turn into sleet and freezing rain, before changing over to all rain. At this time, northern Rhode Island may see several inches of snow before the changeover in precipitation. In fact, the National Weather Service has issued a Winter Storm Watch from 10 p.m. Monday night into 6 p.m. Monday evening. The rain may be heavy at times. So, with snowfall blocking some drainage areas, there is the chance of street flooding. Also, with the heavier rainfall, some rivers may reach flood stage.
The southern part of the state, along with the coastline, will see about 1-3 inches before the changeover to rain. The northern part of the state, basically anyone north and west of I-295 will see about 4-7 inches of snow before the changeover.
As we go into Wednesday, we should see more clouds than sunshine, with the chance of some possible rain showers. Due to a secondary low to our north, some showers may be on the western side of the low. However, this moisture will move offshore by early Thursday morning. For the rest of the week, we will see partly to mostly sunny skies. Temperatures will actually be near seasonable on Saturday, before lowering back to the lower 40’s next Sunday.
72 hour forecast:
Tonight: Clear to partly cloudy skies with a low of 18.
Monday: Mostly sunny up until mid-morning, with increasing clouds and snow showers by the end of the evening commute. We will see a high of 34 with wind shifting to the east-southeast at 7-10 mph in the afternoon.
Monday night: Light to moderate snow, with snowfall of an inch an hour possible. We will see a low of 29 with winds increasing from the east-southeast to 14-17 mph.
Tuesday: A combination of snow, sleet, and freezing rain turning to rain by late morning. Rain may be heavy at times. We will see a high of 42.
Tuesday night: Precipitation changing to snow showers by the evening commute and ending by midnight. Patchy fog is expected. We will see a low of 29.
Wednesday: Partly sunny with possible late afternoon showers and a high of 40.
Wednesday night: Partly cloudy with a low of 26.
Thursday: Partly to mostly sunny. Highs 39-42, lows 27-30.
Friday: Mostly sunny and breezy. Highs 40-43, lows 28-31.
Saturday: Partly to mostly sunny. Highs 44-47, lows 27-30.
Sunday: Partly sunny. Highs 40-43, lows 33-36.