A storm over the Southeast and Mid-Atlantic will move northward along the East Coast to Cape Cod by Monday, then move into the Canadian Maritimes by Tuesday.
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The system will produce snow over parts of the Ohio Valley/Central Appalachians and heavy snow will start over the Northeast on Sunday evening into Monday.
Pockets of rain/freezing rain will also develop overnight Sunday into Monday over parts of The Central Appalachians into the Northeast.
The snow will result in reduced visibility and hazardous driving conditions.
Meanwhile, rain will develop over parts of the Tennessee/Ohio Valleys and the Mid-Atlantic by Sunday evening.
Additionally, showers and moderate to severe thunderstorms will develop over the Southeast.
Therefore, the SPC has issued a Marginal Risk of severe thunderstorms over parts of the Eastern Gulf Coast/Southeast through Monday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, a few tornadoes, and a minimal threat of hail.
In addition, the storm will produce moderate to heavy rain.
Therefore, the WPC has issued a Marginal Risk of excessive rainfall over parts of the Eastern Gulf/Southeastern Coast from Sunday through Monday morning.
The associated heavy rain will create localized areas of flash flooding, affecting areas that experience rapid runoff with heavy rain.
The threats of severe thunderstorms and excessive rainfall will end on Monday.
In the meantime, a front over the Central/Southern Rockies into the Southwest will move southward to Northwest Mexico by Monday.
The system will produce snow over the Intermountain Region/Great Basin and expand into the Southwest overnight Sunday.
On Monday, the snow will develop over parts of the Southwest and into the Central/Southern Rockies.
The snow will continue over parts of the Southwest and Central/Southern Rockies overnight Monday.
On Tuesday, moisture from the Western Gulf of Mexico will stream northward over the Southern Plains producing showers and severe thunderstorms.
Therefore, the SPC has issued a Slight Risk of severe thunderstorms over the Central Gulf Coast and the Southeast on Tuesday.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
Moreover, the showers and thunderstorms will produce heavy rain.
Therefore, the WPC has issued a Slight Risk of excessive rainfall over parts of the Western Gulf Coast and Lower Mississippi Valley.
The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams the most vulnerable.
Furthermore, on Tuesday, the system will produce light to moderate snow over parts of the Southern High Plains into northwest Arkansas.
Also, on Tuesday, upper-level energy move over the Northern Rockies into the Northern Plains will produce light snow over parts of the Northern Intermountain Region/Northern Rockies and Northern High Plains into the Great Basin/Central Rockies.
The snow will result in reduced visibility and hazardous driving conditions. ■