Sunny start, storm potential Tue-Wed

Skies will start off sunny tomorrow morning, but clouds will be on the increase throughout the day as the next system approaches from the Ohio Valley. Strong lift to the north of the warm frontal boundary will quickly trigger showers across SNE Friday evening. Secondary low pressure develops south of Long Island Friday night and moves to the east of Cape Cod by Saturday morning. This low will generate easterly flow that will pump moisture in off the Atlantic. The heaviest rains should occur overnight, with light showers lingering through Saturday morning and early afternoon. This will be a relatively fast moving system so anticipate rainfall of around .3" to .4". As low pressure moves offshore, a cold pool of air aloft may nose toward the surface enough to change rain to snow across higher elevations of southern NH and northern MA. There is a chance that a coating of snow may accumulate in some areas.

Clouds will dissipate through Saturday night, with a broad strong ridge of high pressure moving into the Great Lakes region. Expect mostly sunny skies for Sunday and Monday. High temperatures will climb to near 50 both days, with lows tumbling back into the 20's. Sunday night will be especially cold, with the potential for a few readings in the upper teens.

The next storm will be moving through the southern Plains on Sunday, and moving into the Ohio Valley by Tuesday morning. There is some uncertainty to the track of this storm. It may be shoved well south of the region (as the ECM advertises), keeping us mostly dry, or it could track further north (like the GFS shows), giving us another widespread moderate to heavy rain event Tuesday through Wednesday. There is a slight chance of some snow mixing in Tuesday night into Wednesday morning given the perfect track, but for accumulation, it will be threading the needle.

By Thursday high pressure will be back in place. 8-10 day height anomalies show the development of a ridge over the northeast Atlantic. This will force a trough upstream, near Nova Scotia, keeping New England in a relatively dry northwest flow. Dry weather should be present through the first half of the following weekend.