The last of the mild air has been squeezed eastward by a cold front that moved across western Massachusetts this afternoon. While temperatures are still in the mid and upper 50s, with even a few low 60s, across eastern Massachusetts this evening, locally we have seen the mercury fall back to the 40s and low 50s behind the front. The cold air will continue to overspread the Pioneer Valley overnight as skies become partly cloudy and temperatures fall into the low and mid 30s. Patchy frost is likely and the National Weather Service has issued a Frost Advisory for central and eastern Hampden and Hampshire counties from 4 am to 8 am Wednesday morning. Light north to northwest winds prevail overnight.
The front stalls offshore as low pressure rides along the front Wednesday. The low is expected to pass well to our south and east over the next 24 hours and will throw a cloud shield over us during Wednesday with just a chance of a few light showers. Skies may brighten at times and a peek of sun is possible, especially later in the day. However, it will be a cold and raw day with highs only in the mid 40s to 50 degrees with a light northwest wind.
Skies improve quickly Wednesday evening as the ocean disturbance pulls away. By morning skies will be mainly clear. It will be a cold night with lows in the mid to upper 20s throughout most of the area, a few low 30s in and around Springfield. Winds remain light. It should be noted that if this system were to track closer and bring heavier precipitation to our area we most certainly would have had a chance for some mix of snow, especially through the hilly terrain. That scenario is no longer in the cards as the computer models place the low and its precipitation shield too far east of us.
Nonetheless we still have the cold to deal with for the next several days. The dry and much cooler air mass settles in over the region Thursday and Friday as high pressure builds to our west and south. We will remain in a blustery northwest flow through the period with daily highs in the upper 40s to low 50s. Overnight lows in the upper 20s to low 30s. Skies will range from just a few clouds to partly cloudy at times.
Over the weekend a low pressure system will be tracking just north of the Great Lakes into southern Quebec. The associated warm and cold fronts will swing through here Sunday. The thinking is a sunny start on Saturday, followed by increasing clouds overnight and a chance of a few scattered showers on Sunday. Not as cold, but still below normal for this time of year as highs climb into the low and mid 50s. Overnight lows in the 30s.
At Fenway Park it appears that any rain in the Boston area should be ending early in the evening and a dry forecast is now in place for game 1 of the World Series. However, it will be cold and raw with temperatures falling through the 40s.