Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 247 AM EST Mon Jan 23 2017 Valid 12Z Mon Jan 23 2017 - 12Z Wed Jan 25 2017 ...Moderate risk of severe thunderstorms will persist over Florida through early Monday morning... ...Heavy rain possible along the Southern California Coast... ...Heavy snow for the Sierras... ...Heavy rain over parts of Southern New England... Scattered to widespread showers and thunderstorms have continued from overnight across the Tennessee valley, the Southeast and the Mid-Atlantic. An impressive low pressure system will track through the Appalachians/Southeast and lift northeastward along the Mid-Atlantic and Northeast coast. A line of dangerous storms continue to push through southern Florida this morning. The Storm Prediction Center has this area under a moderate risk through 7am today. Heavy rainfall will also be possible with this system and may lead to local flash flooding - especially areas near the southern Appalachians. As the system parallels the East Coast the precipitation will spread into the Northeast. Excessive rainfall will be possible near New Jersey and Long Island by Tuesday morning. Additionally, snow will develop over parts of Maine by this evening and will expand into parts of the Lower Great Lakes and Central Appalachians - becoming a wintry mix of snow, sleet, and or rain/freezing rain overnight Monday into Tuesday. Much of California, the Great Basin and the Central/Southern Rockies will be in an active wet pattern as a deep upper-level low traverses from the Pacific Northwest eastward to the Central High Plains. Rain and higher elevation snow is expected to develop over California and snow over the western Great Basin will wane by Tuesday morning. Snow and lower elevation rain will develop over parts of the Great Basin, Southwest that will move into parts of the Central/Southern Rockies today and will expand into parts of the Northern/Central High Plains tonight and into Tuesday. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php