Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 220 AM EST Mon Nov 11 2024 Valid 12Z Mon Nov 11 2024 - 12Z Wed Nov 13 2024 ...An Atmospheric River will bring a couple rounds of heavy, lower elevation rain and high elevation mountain snow to the Pacific Northwest and northern California... ...Lingering precipitation chances for the Northeast and Carolinas Monday with some locally heavier rainfall along the central Gulf Coast... ...Above average temperatures continue for much of the country, more seasonable temperatures for the Northeast and the West on Tuesday... A pair of Pacific storm systems will help to usher in waves of moisture into the Pacific Northwest and northern California in an active Atmospheric River pattern over the next couple of days. Moderate to heavy coastal rain and high elevation mountain snow is already ongoing over the Pacific Northwest this morning and will continue to spread inland as well as into northern California throughout the day Monday. A moderate lower elevation rain/wintry mix and higher elevation snow will also spread into portions of the northern Rockies and Great Basin by Monday evening. Some locally heavier snowfall totals of 8-12"+ will be possible for the Cascades with more moderate totals elsewhere. Precipitation will linger into Tuesday for the Pacific Northwest and northern Rockies/Great Basin as well as spread into the central Rockies as this system continues inland. Then, on Tuesday evening, a second system will approach the Pacific Northwest bringing the next wave of moisture inland. Showers and even some thunderstorms along the coast and upslope portions of the Coastal Ranges will lead to some heavier rainfall totals late Tuesday into early Wednesday, with an isolated threat for flooding. Additional heavy snowfall is also expected for the Cascades. Some showers and thunderstorms will linger in the Carolinas and along the central Gulf Coast ahead of a cold front pushing off the East Coast through the day Monday. Higher moisture along the Gulf could lead to some locally heavier downpours. A secondary cold front to the northwest will also bring some additional light to moderate showers to the interior Northeast, which may include a wintry mix by Monday evening. Elsewhere, some isolated showers and storms will be possible across the central/northern Plains and Mississippi Valley late Tuesday/early Wednesday morning as the first storm system over the West reaches the region. Forecast high temperatures Monday continue to remain above average by around 5-15 degrees for much of the country. Some of the most unseasonably warm highs will be throughout New England, with highs in the 50s and 60s, and the Mid-Atlantic, with highs into the 60s and 70s. Otherwise, temperatures range from the 40s and 50s in the northern Plains/Midwest; the 50s and 60s for the Pacific Northwest, northern Rockies, Great Basin, and California; the 50s for the central Plains and Ohio Valley; and the 70s and 80s for the Desert Southwest, Texas, and the Southeast. A cold front passing through the Northeast will bring much cooler, more seasonable temperatures Tuesday, as highs fall into the 40s and 50s. The Pacific system passing through the West will also bring some more seasonable temperatures Tuesday, with highs falling into the 40s for the Great Basin/northern Rockies and the 60s and 70s in the Desert Southwest. Putnam Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php