Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 257 PM EST Mon Feb 12 2018 Valid 00Z Tue Feb 13 2018 - 00Z Thu Feb 15 2018 ...Heavy snow is forecast to continue for higher elevations of Colorado tonight... ...Warmer temperatures are expected for much of the U.S. by Wednesday... The Southwest U.S. and Four Corners region will continue to see some precipitation overnight and into Tuesday--rain in southern parts and snow in northern parts and in higher elevations. This is because of an upper-level low centered over California and Nevada. The heaviest snow is forecast for the San Juan mountains of southern Colorado, where over a foot of snow is possible through Tuesday. In the Northwest, an approaching upper-level low will lead to increasing rain and mountain snow chances by Tuesday night and Wednesday. In the high elevations of the Cascades and far Northern Rockies, 6 to 10 inches of snow is possible. In lower elevations, snow and rain totals will stay light since the system will be moving quickly. The snow is expected to spread into the Northern Rockies and Northern Plains by Wednesday evening. Showers and a few thunderstorms are forecast to continue for eastern Texas through the Lower Mississippi Valley and Southeast over the next couple of days, as moisture remains in the area and a front lingers offshore of the Gulf coast. By Wednesday, the chance for rain will spread to the Tennessee and Ohio Valleys as the moisture spreads northeast. Rainfall totals are expected to be less than an inch. After a cool spell for portions of the U.S., much of the Lower 48 will be in a warming trend into the middle of the workweek due to south winds bringing in warmer air. By Wednesday, high temperatures east of the Rockies will be above average, particularly in the Plains to Ohio Valley, where temperatures 10 to 20 degrees warmer than normal are forecast. This will be over a 30 degree high temperature swing for parts of the Plains from Monday to Wednesday. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php