A strong cold front will extend from the Ohio Valley through the Ozarks into the Southern Plains on Monday.
Moisture from the Gulf of Mexico will interact with energy along this front to produce showers and thunderstorms with periods of heavy rain. Persistent showers and periods of heavy rainfall over the already-saturated areas of these regions may cause flooding and river flooding. Meanwhile, a wave of low pressure along the southern half of this front will enhance storms in Arkansas, northern Louisiana and parts of Mississippi. The Storm Prediction Center has issued a slight chance of severe weather activity across Louisiana, central to northeastern Mississippi and northwestern Alabama. Wind damage and large hail will be the main threats associated with storms in these areas.
In the West, a cold front will move through the Pacific Northwest and Northern Intermountain West with coastal rain showers and high elevation rain and snow. Additional precipitation is expected in the Central and Southern Rockies, while high pressure prevails throughout the rest of the West with dry and pleasant weather conditions.
Temperatures in the Lower 48 states Sunday have ranged from a morning low of 8 degrees at Yellowstone, Wyo., to a high of 102 degrees at Laredo, Texas.