...Heavy rain possible over Middle Mississippi Valley and Florida...
...Snow possible for Mid Mississippi Valley to Upper Great Lakes...
...Freezing rain possible over parts of Upper Great Lakes...
...Temperatures will be 20 to 35 degrees below average from the Southern Rockies/High Plains to the Upper Great Lakes...
A quasi-stationary front extending from the Southern Plains to the Upper Great Lakes will aid in focusing precipitation through the short range period.
Moisture from the Gulf of Mexico will overrun the boundary producing moderate snow at times on the northwestern side of the
precipitation shield from the Middle Mississippi Valley to the Upper Great Lakes through late Thursday night.
The snow will wane along the northwestern edge on Friday morning.
Overnight Thursday, freezing rain and rain will develop over parts of the Upper Great Lakes, retreating into Central Ontario by Friday evening.
Showers and thunderstorms will develop over the Southern Plains into parts of the Great Lakes through Thursday evening. In addition, an area of rain will develop over parts of the Southern High Plains into the Upper Great Lakes through early Friday morning.
On Friday morning, light to moderate rain will develop over parts of the Middle/Lower Mississippi Valley moving into parts of the Tennessee Valley by Friday evening.
Meanwhile, an upper-level low over the Central Gulf Coast will move slowly eastward to Florida and weaken by Friday evening. The system will produce showers and thunderstorms over the Central Gulf Coast to the Southeast.
The showers and thunderstorms will wane to the Eastern Gulf Coast /Southeast by Friday evening.
Additionally, upper-level energy will move onshore over the Pacific Northwest to the Northern Rockies late Thursday into Friday. The energy will produce rain and highest elevation snow over parts of the Northern Rockies/High Plains by Friday evening.