Weather across America

(NATIONAL) Heavy snow for the Upper Midwest, Cascades, and Northern Intermountain Region, a moderate risk of excessive rainfall over the central Gulf Coast, an enhanced risk of severe thunderstorms over parts of the central Gulf Coast and a slight risk of severe thunderstorms over the southeast Coast and southern Mid-Atlantic. 

A developing storm over the southern Rockies will move northeastward the Upper Great Lakes by Tuesday evening. The system will produce snow over parts of the Northern Intermountain Region southward to the Southwest/Southern Rockies Sunday evening into Monday and rain over the lower elevations of the Southwest. On Monday, the storm will create heavy snow over parts of the Central/Southern High Plains and Northern/Central Plains. 

There are Blizzard Warnings over parts of the central/southern High Plains through early Tuesday morning. Moreover, as moisture streams northward over the Plains and Mississippi Valley, showers and thunderstorms with heavy rain will develop over the central Gulf Coast. Therefore, the WPC has issued a Moderate Risk of excessive rainfall over the central Gulf Coast from Monday into Tuesday morning. 

The associated heavy rain will create numerous areas of flash flooding. Furthermore, many streams may flood, potentially affecting larger rivers. Additionally, the showers and thunderstorms will be severe over the central Gulf Coast on Monday. Therefore, the SPC has issued an Enhanced Risk of severe thunderstorms over the central Gulf Coast from Monday through Tuesday morning. 

The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes. Moreover, there will be an increased threat of EF2 to EF5 tornados and severe thunderstorm wind gusts of 65 knots or greater over parts of the central Gulf Coast. The storm will move over the Middle Mississippi Valley to the Upper Great Lakes on Tuesday evening. 

Heavy snow will continue over parts of the middle/upper Mississippi Valley, and moderate snow will fall into parts of the Upper Great Lakes. Furthermore, snow will start over parts of the Northeast on Tuesday afternoon into evening. The threat of excessive rainfall moves to the Northeast, Mid-Atlantic, and Southern Appalachians on Tuesday. Therefore, the WPC has issued a Moderate Risk of excessive rainfall over parts of the Northern Mid-Atlantic on Tuesday. 

The associated heavy rain will create numerous areas of flash flooding. Furthermore, many streams may flood, potentially affecting larger rivers. Further, the threat of severe thunderstorms decreases slightly on Tuesday as the warm sector moves into the Southeast. Therefore, the SPC has issued a Slight Risk of severe thunderstorms over parts of the Southeast Coast and southern Mid-Atlantic on Tuesday. 

The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes. Meanwhile, a front over the North Pacific moves onshore over the Pacific Northwest overnight Sunday into Monday. The system will produce rain and higher-elevation over the Northwest. 

Heavy snow will develop over the Cascades and the Northern Intermountain Region overnight Monday into Tuesday. Rain and higher-elevation snow will move into parts of Northern California late Tuesday morning into the afternoon. Snow will also move into parts of the Northern High Plains on Tuesday evening.