Quebec Cluster Storms Poised for Severe Intensification Over New England — SevereWX

Thunderstorms lingering near the Maine-New Hampshire border and a fresh cluster over southern Quebec are showing signs of strengthening as they near a rich unstable air mass this evening.

The SPC's Mesoscale Discussion 1616 highlights how wildfire smoke and clouds have capped heating in parts of New England, keeping current storms in northern NH and southwest ME relatively weak. But just south of a key baroclinic zone, MLCAPE soars to 2000-3000 J/kg with strong vertical shear. If these storms tap that juice, they could morph into organized clusters or supercells packing 1.50-2.50 inch hail, 55-70 mph wind gusts, and EF1 tornadoes (100-125 mph).

Adding fuel, agitated cumulus along the U.S.-Canada border and HRRR model runs suggest the Quebec cluster could intensify, aided by an approaching upper trough and 70+ kt mid-level jet. This setup offers ascent to bust lingering inhibition, though forecasters note very low confidence in the evolution.

The environment conditionally backs severe-organized convection across portions of northern New York, Vermont, New Hampshire, and southwest Maine through around 7 PM EDT. Watch issuance sits at 40% probability—trends are under close watch.

Peak Threats:

Keep an eye on radar for storm developments. Have your severe weather plan ready—secure outdoors, seek shelter for large hail or tornado warnings, and monitor local NWS updates.