Today will featured continued warm temperatures and seasonably-uncomfortable humidity as southwesterly flow continues to plague the region ahead of a cold frontal boundary over the Great Lakes. Conditions today will be pretty similar to those we saw yesterday, with the hottest temperatures focused in the foothills and the coastal plain west of I-95. In this region, temps will top out in the upper 80s to low 90s this afternoon. Up in the mountains, temps will be ever so slightly cooler (mid 80s) with the nicest conditions found in higher elevations. Onshore flow will keep the coast even cooler, with highs ranging from around 70 in Rockland to around 80 closer to Portland.
Skies won’t be nearly as sunny today as the cold front moves closer. In fact, most of the area appears to be overcast this morning. Some breaks in the clouds are likely, especially across northern and eastern regions. These clouds are the only reason we won’t be headed for another day of widespread 90+ temps.
That said, we will still have enough warmth and moisture for some instability this afternoon. While the main cold front will remain too far west to be useful for triggering thunderstorms in our area, the large-scale lifting associated with the upper-level features associated with the front will give the mountains an assist in producing scattered thunderstorms, much like we saw a couple days ago. With that in mind, keep an eye to the sky if you’re headed for the hills later today. Stronger winds both near the surface and aloft will support a more robust severe weather threat this afternoon/evening especially in western NH and points north/west of Farmington ME. The primary threats will include damaging winds, heavy rain, and lightning.