Large Hail, Severe Gusts Possible as Thunderstorms Fire in Northern Appalachians — SevereWX

Northern Appalachians and New England Face Conditional Severe Threat

The Storm Prediction Center has issued Mesoscale Discussion 1418, highlighting a growing risk for severe thunderstorms across parts of the northern Appalachians into New England. A 60% chance of a tornado watch exists from 1 PM to 8 PM CDT (2 PM-9 PM EDT) as daytime heating unlocks extreme buoyancy in a very moist air mass.

Surface temperatures are surging into the upper 80s to low 90s, eroding any lingering low-level stability and boosting MLCAPE to around 3000 J/kg. While regional forcing remains weak under an upper ridge, subtle confluence and terrain should spark isolated thunderstorms by late afternoon (roughly 3-6 PM EDT). These storms could multiply along outflow boundaries in this uninhibited setup.

Modest 30-35 knot mid-level flow may organize any development into transient supercells or clusters, priming threats of 1.00-1.75 inch hail (up to tennis ball size) and 55-70 mph wind gusts. CAM models show high variance in coverage, but any robust initiation could prompt watch issuance.

Impacts look most probable across portions of PA, NY, NJ, and into New England—populated areas where severe weather is less common but highly disruptive.

Stay prepared: Monitor radar closely, have a severe weather plan, and heed local warnings. Power outages, hail damage, and downed trees are possible. Check SPC updates at spc.noaa.gov.