Today will feature the return of much cooler weather as northwesterly flow pushes air straight from northern Canada into the region this morning. Not far to our northwest, over Ontario, temps are currently in the 10s and low 20s. That airmass, while it won’t be nearly as cold when it gets here, is what’s moving our way today. Because our winds have a bit more of a northerly component today (not pure NW, more like NNW), we unfortunately need to entertain the idea of some clouds as moist cyclonic flow around an area of low pressure near Cape Breton sends a deck of stratus our way. These clouds are thickest across the mountains (upsloping) and parts of central Maine. Currently, southern Maine is looking at a mix of sun and clouds while New Hampshire is considerably sunnier (downsloping off the Whites).
As a disturbance pinwheels around that low into our area, expect cloud cover to expand this afternoon. Some brief showers can’t be ruled out either (best chance in the mountains and northeast of Portland). This disturbance will also mark the end of the best support for northwesterly flow. As a result, the gusty NW winds you see this morning should taper off by this afternoon/evening.
High temps today will be on the cooler side, ranging from around 40 in the mountains to just above 50 along the coastal plain.