Weather across America

(NATIONAL) Rain and heavy mountain snow to continue across the West, unseasonably warm temperatures in the central U.S., and periods of snow and a wintry mix persist for coastal New England as the rest of the East Coast begins a warmup. 

Lower elevation valley/coastal rain and heavy high elevation mountain snow continue to expand across the west as multiple storm systems affect the region. The first system that brought more heavy rain and flooding concerns across California on Saturday moved through the Great Basin and towards the Rockies ahead of another system moving in from the Pacific early Monday. 

Rain also continued for lower elevation valley locations across the West Sunday, with some snow mixing in outside of the Desert Southwest. Heavier snow is expected at higher elevations in the mountains from the Cascades into the Great Basin and the Four Corners region. The highest totals through Tuesday morning will be in the Wasatch, San Juan, and White Mountains, as well as along the higher elevations of the Mogollon Rim and in the Sierras where 1-2 feet, locally higher, are forecast. 

Precipitation chances begin to taper off for the northern tier of the West Monday as the next storm system is forecast to take a more southerly track. Isolated cases of flooding are possible in southern California as well as upslope regions of the Sierra and Mogollon Rim. High temperatures will be seasonably cool in the Pacific Northwest and Northern Rockies with mostly 40s expected. Cooler than average temperatures are forecast further south as clouds and precipitation linger across the region, with highs only reaching the 50s for much of the Desert Southwest and the low 60s for southern California. Highs in the 50s are forecast for central and northern portions of California, with 30s and 40s for the Great Basin and Central/Southern Rockies.

Precipitation chances ramp up this evening for the Northern/Central Plains, Midwest, and Mississippi Valley as a storm system strengthens and begins to track to the northeast. Showers and some thunderstorms are forecast to continue into Monday for the Mississippi, Ohio, and Tennessee Valleys while a wintry mix of freezing rain, sleet, and snow will spread from the High Plains northeastward to the Upper Midwest to the north of the surface low track. Snow accumulations are expected to remain light, but a glaze to a tenth of an inch of ice will be possible from eastern South Dakota through southern Minnesota and northern Wisconsin.

High temperatures remained on the chilly side Sunday afternoon for the East Coast as the airmass slowly moderates following the passage of a cold front earlier this weekend. Temperatures begin to rebound more on Monday as 50s overspread portions of the Mid-Atlantic and 60s return to the South. A wintry mix of freezing rain, sleet, and snow will linger for coastal New England and Maine as a low-pressure system over the Atlantic tracks northward towards the region. A couple inches of snow are possible over eastern Massachusetts with some locally higher amounts possible. The precipitation will be heaviest in Maine, where several inches of snow, an inch of sleet, and 0.25"+ of freezing rain are possible through Monday night.