...Heavy rain across the southern tip of Texas...
...Temperatures will be 10 to 20 degrees below average over parts of the Upper Midwest and the Upper Great Lakes...
...Temperatures will be 10 to 15 degrees below average over parts of the Southern Plains...
A complex storm over the Northeast will move northeastward to the Davis Strait by Tuesday. The system will produce moderate snow over parts of Northern New England that will taper off to light snow over parts of the Northern Appalachians before ending on Monday.
Moderate to heavy rain will develop over Southern New England into coastal Mid-Atlantic on Sunday evening before ending early Monday morning over Coastal Northern New England.
Additionally, the associated front will linger over the southern tip of Florida producing showers and thunderstorms over the area through
Meanwhile, upper-level energy over the Northern High Plains will move eastward to the Great Lakes by Tuesday morning. The energy induces a low over the Northern High Plains that will move eastward to the Great Lakes. The storm will produce snow over the Northern High Plains/Northern Plains on Sunday evening that will move to the Great Lakes by Tuesday. Downwind from this system, lake effect snow will develop downwind of the Great Lakes through Monday night.
On Monday, upper-level energy will move onshore over the Pacific Northwest moving to the Central Rockies by Tuesday morning. Snow will develop over parts of the Northern Rockies by Monday afternoon, that will expand into the Northern Plains/Middle Missouri Valley by Tuesday.
In addition, another region of upper-level energy over Northern Mexico
will move eastward to the Lower Rio Grande Valley by Tuesday morning. The energy will produce light to moderate rain over the Southern tip of Texas starting early Monday morning and extending into Tuesday.