Omega Block Cools New England 5-10 Degrees as Rain Brings Up to 2 Inches

2 articles · Updated · The Boston Globe · May 27

New England shifts into a cooler, unsettled stretch after a front turned winds northerly, with temperatures expected to run 5 to 10 degrees below average into the weekend.
An Omega Block tied to a heat dome over Central Canada is locking that pattern in place, keeping a trough of cooler air over the region and slowing any quick warmup.
Thursday stays relatively mild but cooler, with Boston near the low 70s, the coast in the upper 60s and scattered afternoon pop-up showers after a sunnier morning.
Friday into Saturday brings the wetter period as a Canadian storm pushes south, turning scattered showers into steadier rain; northern New England could pick up as much as 2 inches, while Greater Boston may see about 0.5 inch.
The cooldown follows an unusually warm May in Boston, which has already logged 13 days at 70 degrees or higher, six 80-degree days and three 90-degree days—its most 90-degree days in May since 2017.

From record heat to May snow in New England. Is this extreme weather whiplash our new climate reality?

A rare 'Omega Block' is freezing New England. Why are these powerful atmospheric 'traffic jams' so difficult for forecasters to predict?