Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 1219 PM EST Mon Nov 25 2024 Valid 00Z Tue Nov 26 2024 - 00Z Thu Nov 28 2024 ...Heavy snow over parts of the Sierra Nevada Mountains, Upper Great Lakes and Central Rockies... ...Below average temperatures in the Plains... A surface low pressure system with its accompanying upper level trough will move inland across the West, helping to focus anomalous moisture over coastal areas as well as the southern Sierra Nevada. In lower elevations of the southern Sierra Nevada, there is a Slight Risk of excessive rainfall/flash flooding through Tuesday. Heavy snow is probable at the higher elevations, where 3 foot amounts, with local totals to 6 feet, are forecast to accumulate by Wednesday morning. The anomalous moisture feed is also expected to penetrate into the interior of the West. Parts of the Great Basin will experience snow showers while heavy snow blankets the Intermountain West and Colorado Rockies with 1-2 feet (isolated 4 feet) likely over the next couple of days. A low pressure system moving through the Great Lakes into southern Canada will generate several inches of snow over the Upper Peninsula of Michigan, while snow showers occur across the greater Upper Midwest and Lower Great Lakes due to the combination of cold air at the surface and aloft interacting with Great Lakes water temperatures (which are at record levels for late November). The broad cyclone will drive a cold front through much of the southern Plains and Southeast before it rebounds north ahead of the system moving through the West into the southern Plains on Wednesday, bringing the threat of record high temperatures across south-central and southeast Texas. Much of the Plains, Midwest, and Great Lakes will be below average, yet seasonably cold. Ahead of the front, mild conditions continue over much of the East Coast through Tuesday with warm temperatures across Florida through the foreseeable future. Roth/Kebede Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php