Heavy snow over parts of Northern/Central Rockies.

There is a Slight Risk of excessive rainfall over parts of Southern New
England/northern Mid-Atlantic on Wednesday.

There is a Slight Risk of severe thunderstorms over parts of the
Southern Plains on Thursday.

Low pressure along the northern Mid-Atlantic Coast will move northeastward
into Southeast Canada by Wednesday morning. The low will develop light
rain over New England through Wednesday morning.

Additionally, a front extending from the Lower Great Lakes to the Southern
Plains will move eastward off the East Coast by Thursday evening. Moisture
pooling along the front will aid in developing showers and thunderstorms
over parts of the Lower Mississippi Valley northeastward to the Lower
Great Lakes through late Tuesday evening. Overnight Tuesday, the showers
and thunderstorms will be over parts of the Central Gulf Coast and
Southeast. The showers and thunderstorms will move off the Southeast Coast
overnight Wednesday. Further, light rain will develop over parts of the
Ohio Valley into parts of the Northeast by Wednesday morning.

On Wednesday, the system will produce rain over parts of the Northeast and
Mid-Atlantic. The rain over Southern New England/northern Mid-Atlantic
will be heavy. Therefore, the WPC has issued a Slight Risk (level 2/4) of
excessive rainfall over parts of Southern New England/northern
Mid-Atlantic from Wednesday through Thursday morning. The associated heavy
rain will create mainly localized areas of flash flooding, with urban
areas, roads, and small streams the most vulnerable. On Thursday, rain
will continue over parts of New England, with snow over northern Maine.  

Moreover, a wave of low pressure along a front over the Northern/Central
Rockies will produce heavy snow over parts of the area through Wednesday.
The associated boundary will linger through late Wednesday afternoon,
producing light snow at the higher elevations. In addition, weak onshore
flow will aid in creating light rain over parts of Northern California
through late Wednesday night.

Overnight Tuesday, the onshore flow will move southward, producing rain
over parts of Central California through early Thursday morning. Moreover,
the onshore flow will move southward over Southern California, creating
light rain through Thursday evening. 

Furthermore, the wave of low pressure moves eastward into the Northern
Plains by Wednesday morning and into Central Canada by Thursday. On
Wednesday, the low will produce light to moderate snow over parts of the
Northern Plains and the Upper Mississippi Valley.

The associated front will move southeastward over the Central Plains into
the Southern Plains by Thursday. On Thursday, the boundary will create
showers and severe thunderstorms over parts of the Southern plains.
Therefore, the SPC has issued a Slight Risk (level 2/5) of severe
thunderstorms over parts of the Southern Plains on Thursday. The hazards
associated with these thunderstorms are frequent lightning, severe
thunderstorm wind gusts, hail, and a few tornadoes.