Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 345 AM EST Thu Jan 05 2017 Valid 12Z Thu Jan 05 2017 - 12Z Sat Jan 07 2017 ...Heavy snow possible over the Southern Rockies... ...Heavy snow possible downwind from the Great Lakes... ...Snow possible for parts of the Southeast... ...Heavy rain possible for parts of Florida... Upper-level energy over Northern California/Pacific Northwest will move southeastward to the Southern Plains by Friday evening. Onshore flow will stream a plume of moisture into Central/Southern California will slowly wane over California on Thursday before strengthening overnight Friday. The system will produce rain and snow from parts of California to the Central/Southern Rockies that will end over California by Friday morning. The rain and snow will move southeastward into the Southwest and Southern/Central Rockies on Friday morning. In addition, as upper-level energy streaks out over the Southern High Plains on Thursday night into Friday will produce snow over parts of the Southern High Plains overnight Thursday into Friday. The rain and snow will end over the Southwest and the Southern/Central Rockies overnight Friday. As upper-level energy moves onto the Southern Plains on Friday, low pressure will develop along the Western/Central Gulf Coast overnight Thursday that will move to the Eastern Gulf Coast by Friday evening. Before the low develops, cold high pressure over the Northern Rockies will move to the Southern Plains with the cold high pressure extending eastward to the Tennessee Valley/Southern Mid-Atlantic by Friday. The developing low will pull moisture from the Gulf of Mexico northward overrunning the associated front. Rain will develop over parts of the Western Gulf Coast/Lower Mississippi Valley on Thursday evening that will expand eastward to the Central/Eastern Gulf Coast by Friday morning and the rain will intensify over the Central/Eastern Gulf Coast by Friday evening. Additionally, as upper-level energy streaks eastward over the Lower Mississippi Valley into the Tennessee Valley/Southern Appalachians snow will develop over the interior Lower Mississippi Valley by Friday morning expanding into parts of the Tennessee Valley/Southern Appalachians by Friday evening. Meanwhile, upper-level energy over the Great Lakes to the Middle Mississippi Valley on Thursday morning will aid in producing snow over parts of the Middle Mississippi Valley into the Ohio Valley that will move into the Lower Great Lakes/Central Appalachians by Thursday evening. Overnight Thursday the snow will end over the Middle Mississippi Valley and the Ohio Valley. In the meantime overnight Thursday, low pressure will develop along the Southeast Coast and move northeastward to Cape Hatteras by Friday morning before moving out over the Western Atlantic by Friday evening. Snow will develop overnight Thursday over the Northern Mid-Atlantic into New England with rain over parts of Southeastern Virginia and North Carolina that will move off the coast by Friday afternoon. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php