Showers and thunderstorms will develop along and ahead of the front from the Northeast to the Southeast.
A few storms may turn severe across parts of the Northeast and the Southeast.
Therefore, the SPC has issued a Slight Risk of severe thunderstorms over parts of the Northeast/northern Mid-Atlantic and Southeast through Sunday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
Farther north, over Maine, rain will mix with rain/freezing rain overnight Saturday into Sunday morning, as rain/snow occurs over parts of the Great Lakes.
In the wake of the system, light rain and higher elevation snow will develop over parts of the Northeast on Sunday.
Meanwhile, a front moving across the West and the associated deep upper-level trough will move from the Northern Rockies/Southern California eastward to the Plains, as a wave of low pressure develops over Southern Plains by Monday evening.
The storm will produce coastal/lower elevation rain and higher elevation snow over the Pacific Northwest into parts of the Northern Rockies/Great Basin and California overnight Saturday.
On Sunday, snow over the Northern Rockies/Great Basin will move into the Central/Southern Rockies, with rain over the lower elevations over the Southern Rockies.
Onshore flow and a deep upper-level trough will produce rain and higher elevation snow over parts of the Pacific Northwest into Monday evening.
As the system moves out of the Rockies, a wave of low pressure will develop over the Southern High Plains, pulling moisture northward over the Plains and Mississippi Valley from the Gulf of Mexico.
The wave of low pressure will produce snow over the Central/Southern Rockies and showers and thunderstorms over the Central/Southern Plains and the Middle/lower Mississippi Valley.
Some of the thunderstorms will become severe.
Therefore, on Monday, the SPC has issued an Enhanced Risk of severe thunderstorms over parts of the Southern Plains and Lower Mississippi Valley.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
In addition, there will be heavy rain associated with these thunderstorms.
Therefore, the WPC has issued a Slight Risk of excessive rainfall with these thunderstorms over the Ark-La-Tex and adjacent parts of Oklahoma on Monday.
The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams the most vulnerable through Sunday morning.
Furthermore, the SPC has issued a Critical Risk of fire weather over parts of the Southern Rockies and Central/Southern High Plains on Sunday due to gusty winds, low relative humidity, and dry fuels. ■