Monday and Monday night...
Following the cold and raw weekend, Monday will be a breath of fresh
air as a warm front lifts north of southern New England bringing the
return of temperatures well into the 60s. This is thanks to a
surface low which lifts from the Great Lakes Sunday night into Nova
Scotia by Monday night. This drags the warm front into northern New
England bringing a plume of moisture overhead with dewpoints in the
mid 50s and PWATs approaching 1.5". This, together with ample
forcing from a 45-60 kt LLJ, placement beneath the right entrance
region of a 300 mb jet, and the surface cold front will lead to
widespread rain including some heavy downpours and even some
embedded thunder. There is some marginal instability available with
several hundred J/kg of MUCAPE in the warm sector late Monday/Monday
night. By the time the rain moves out Tuesday morning 0.5-1 inches
of rain are likely to have fallen.