Abrupt Spring Cooldown Grips Midwest, Northeast

A significant cooldown has swept into parts of the Midwest and Northeast, so hopefully you haven't put away your jacket yet after enjoying a taste of spring last week. This flip to a cooler temperature regime is due to an upper-level trough that has dipped southward into Midwest, dragging modified Canadian air from the northern Plains to the Northeast. This upper-level trough will make slow progress eastward which will allow the cool temperatures to remain in place.

The trough will likely begin to shift off the East Coast midweek, but a northwest flow in the higher levels of the atmosphere will keep the cooler air in place.