Active weather will continue in the eastern half of the nation Monday as low pressure in the Great Lakes moves eastward into the Northeast. Showers and thunderstorms will develop along an associated stationary front that will extend across the northern Mid-Atlantic.
Additional precipitation and clusters of thunderstorms are anticipated along and ahead of an associated cold front that will trail behind this system, extending through the Ohio Valley into the Central Plains. In addition to storms, strong humidity and daytime heating will lead to another day of hot temperatures and high heat indices from the Plains through the Eastern Valleys and the Mid-Atlantic.
Daytime highs in these regions are expected to climb into the 90s and 100s, while heat indices reach into the 110s. Residents in these areas are encouraged to drink plenty of fluids, stay in air-conditioned facilities, and check on neighbors _ especially the elderly, young children and pets.
In the West, chances of showers and thunderstorms will remain over the Four Corners because of monsoonal moisture and daytime heating. To the north, a wave of low pressure will kick up a few showers and thunderstorms in parts of the Northern Intermountain West and Northern Rockies. Temperatures in the Lower 48 states Sunday ranged from a morning low of 28 degrees at West Yellowstone, Mont., to a high of 109 degrees at Shawnee, Okla.