The weather on Sunday will be almost a carbon copy of the weather from the start of the weekend, and most folks in the U.S. can wear their sunday best without concern. However, the Gulf Coast and the Pacific Northwest are set for sturdier showers.
This weekend's atmospheric river will continue to funnel moisture into the northwestern quadrant of the nation. This will result in frequent rain showers for the Pacific Northwest and the lowest elevations of the interior Northwest, resulting in scattered urban and lowland flooding. Inundating totals of 2 inches or higher will be widespread west of the Cascades and the coastal ranges. Remember, "Turn Around, Don't Drown!"
Meanwhile, expect a rain/snow mix for the middle elevations and wet snow piling up in the higher elevations. Although some isolated peaks will rack up well over a foot of snow, mainly lighter accumulations are expected in the Cascades.
The same low developing in the Gulf will hug the coastline, with its heaviest rain totals in the Bayou surpassing 2 inches or more! Elsewhere, expect light showers and scattered thunderstorms from eastern Texas just into the Florida Panhandle by midnight. Although unlikely, there is a small chance for a morning wintry mix a few hundred miles inland from the Texan coastline.
A few lake-effect snow showers will move over the Great Lakes and interior Northeast. While most areas see generally small accumulations, some locally heavier amounts are possible immediately downwind from the lakes.
Temperatures will continue to moderate throughout the U.S. on Sunday. The coldest spots will be the tallest peaks in the Rockies as well as the interior Northeast. Here, highs will stay in the 20s and subfreezing 30s. Otherwise, higher 30s and 40s will be predominant to close out the weekend, including throughout the Rockies, the far northern Plains, the Great Lakes, the Midwest, the Mid-Atlantic, and southern New England.
Fifties and 60s are largely in store across most of the Northwest, the Great Basin, the Deep South, the Southeast, and even the High Plains! One exception in the South is that some 40-degree chills could linger under the Gulf Coast's storms. Being the nation's warmest, California into the Desert Southwest, the southern High Plains, and Florida will heat into 70s and 80s.