Low pressure over the Southern/Central Plains will move northeastward to New England by Friday evening.
Article continues below
The system will produce snow over parts of the Central Plains/Middle Mississippi Valley and rain and embedded thunderstorms over parts of the Middle/Lower Mississippi Valley from Wednesday evening into Thursday morning.
As the storm moves farther eastward, moisture from the Gulf of Mexico will stream northward over the Southeast aiding in the production of showers and severe thunderstorms, on Thursday.
Therefore, the SPC has issued a Slight Risk of severe thunderstorms over parts of the Southeast from Thursday into Friday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, a few tornadoes, and a minimal threat of hail.
The threat of severe thunderstorms ends on Friday.
Furthermore, a weak wave of low pressure over the Upper Great Lakes on Wednesday evening will merge with the low pressure over the Middle Mississippi Valley by Thursday.
The system will produce light snow over parts of the Upper Great Lakes and light rain over the Lower Great Lakes/Ohio Valley overnight Wednesday moving into parts of the Northeast on Thursday morning.
As the precipitation moves into the Northeast overnight, a few pockets of rain/freezing rain will develop over the area.
Overnight Thursday, rain moves into the Mid-Atlantic/Northeast and heavy snow develops over Northern New England.
In addition, a slightly broader spread of rain/freezing rain will also develop over Northern New England.
On Friday morning, light snow will develop over parts of the Ohio Valley into the Central Appalachians, continuing over the Central Appalachians on Friday evening.
Meanwhile, moisture from the Pacific will stream into the West Coast, producing heavy rain over parts of Northern California and rain and higher elevation snow over other parts of California and the Pacific Northwest through Friday evening.
Therefore, the WPC has issued a Slight Risk of excessive rainfall over parts of Northern California from Wednesday to Friday evening.
The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, small streams, and burn scars the most vulnerable. ■