Backdoor Cold Front; Relief After Today

Good morning! Today will feature some more clouds, and a chance for some thunderstorms, especially in northern MA and southern NH. Winds will generally turn north or northeast, mostly light; some spots up to 10 mph with some exceptions. Nonetheless, mainly high clouds are expected for those who see clouds and it will remain mostly sunny to sunny.

Highs today will range from the mid to upper 60s in far northern Maine to around 90 in the Connecticut and Merrimack river valleys; in between, low 70s are likely throughout more of the northern half (but not necessarily far-northern) of Maine, with upper 70s to mid-80s in southern Maine, warmer as you get closer to the coast (but cooling off at the immediate coast, to high temperatures in the mid to upper 70s.) Across New Hampshire, highs will range from the mid to upper 70s in northern New Hampshire, to the low to mid 80s across central New Hampshire, and the mid 80s across most of southern New Hampshire (with upper 80s and perhaps a 90 reading in the Merrimack River Valley from Concord south to the MA border); highs will be in the upper 70s at the coast. In Vermont, lower to mid 80s along the western and eastern state borders, and around 80 elsewhere. In Massachusetts, highs range from the upper 70s on outer (eastern) Cape Cod, Martha’s Vineyard and Nantucket to the low 80s on the remainder of the coast (including southern/western Cape Cod); low 80s also prevail in parts of the Berkshires. Mid 80s to be the rule across western Mass., as well as areas near but not right at the coast plus southeast Massachusetts; upper 80s will be widespread across central and northeast Mass. and much of the Boston metro. Upper 80s and low 90s to prevail across the Merrimack Valley west of Lawrence, and the Connecticut Valley south of the Vermont/NH tripoint. Rhode Island will range from 80 to 90, lowest south, highest north. Connecticut will be ranging from the mid 80s to 90, except around 80 at the coastline – warmest temps along the Connecticut (River) Valley.

A backdoor cold front for most today will bring relief tomorrow in the form of much cooler temperatures.

There will be a chance of thunderstorms, particularly in S. New England and the southern third of N. New England; no severe weather is expected, as these storms will mostly be triggered by some instability aloft, with little shear to work with.

The HRRR shows these as mainly harmless showers in mainly southern NH:hrrr_ref_boston_16

No less, lightning is a leading killer; if you can hear thunder, you are close enough to be struck by lightning. Heavy rain and gusty wind can’t be ruled out either.

Have a good day!

-Nathan

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