The back door cold front that moved through the local area very early Sunday morning lies across western Massachusetts into northeast Connecticut and across Rhode Island this morning. North of Boston temperatures are in the low 30s and for that matter generally in the 30s throughout the eastern 2/3rds of the state, except in the low 40s through Cape Cod. Meanwhile, on the other side of the front temperatures are in the 50s through a good portion of Connecticut.
The original forecast for Sunday became a complete bust once it was evident the cold front would move through. Temperatures that were forecast to reach into the 50s fell backwards into the 30s behind the frontal passage and they stayed there throughout the day. Cold air continues to drain southward and temperatures have inched to the freezing level throughout the local area. With rain advancing from the southwest the big concern becomes icing this morning as freezing rain is likely throughout parts of the area once the rain shield in Connecticut arrives. The National Weather Service has continued the Freezing Rain Advisory through the morning hours, until 1 pm this afternoon.
Low pressure will move across the area later today and tonight. Temperatures should rise a few degrees this afternoon, above the freezing level, so that any rain that continues to fall through the day will not freeze at that time. It is a dangerous set up that needs to be monitored very closely throughout the day. The good news for the morning commute was that traffic was much lighter than usual as many folks take time off for holiday preparations.
Once the low pressure pulls away tonight the precipitation will shut off and skies improve Tuesday. However, an upper level disturbance moves through southern New England during the day and this will hold in some clouds locally with a chance of snow showers in Connecticut. It turns colder and stays that way into Christmas Day with much drier conditions.
72 Hour Outlook:
Today: Fog and mist with periods of rain and freezing rain through the morning, possibly into the early afternoon, becoming plain rain for the remainder of the day. Temperatures in the low 30s this morning will only recover to the mid 30s to 40 degrees this afternoon. Light north winds.
Tonight: Chance of a few showers early, slight chance of a brief mix or change to snow before ending, then remaining mostly cloudy overnight. Lows falling into the mid to upper 20s by morning. Northwest winds 5 to 15 mph.
Tuesday: Partly cloudy and cold. Temperatures remaining fairly steady as highs only recover to the upper 20s and low 30s. Northwest winds 10 to 15 mph.
Christmas Eve: Partly cloudy and colder. Lows in the teens.
Christmas Day: Much colder despite sunshine. Highs only in the low to mid 20s.
Christmas Night: Partly to mostly cloudy. Lows in the low 20s.