In the West, strong low pressure in eastern Montana would produce more unsettling weather across portions of the Northwest and the
upper Midwest as it lifted northeastward through North Dakota toward south-central Canada. Increasing instability associated with this system would translate into scattered thunderstorm activity, rainfall and breezy conditions from the
northern Intermountain West to the upper and lower Mississippi valleys. Forecasters said thunderstorms in the
northern Plains and the upper and lower Mississippi valleys might turn severe with large hail, strong winds and damaging wind gusts, very heavy rainfall, and isolated tornadoes. Residents of these regions were encouraged to monitor the local weather activity throughout the day.
In the East, a less potent low pressure system would trek eastward across New England with scattered rain showers and chances of thunderstorms Thursday. The system would also swing the upper half of an associated cold front across the Mid-Atlantic coast, allowing showers over the region to taper off through the afternoon. As this disturbance exited, high pressure from the Great Lakes would begin filling into the
northern Appalachians. Meanwhile, to the south, the tail of the aforementioned cold front would become draped across the Southeast. Moisture over the region would combine with energy near the disturbance to kick up scattered showers and thunderstorms through the afternoon.
Temperatures in the Lower 48 states Wednesday ranged from a low of 26 degrees at Lakeview, Ore., to a high of 105 degrees at Goodyear, Ariz.
