Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 446 PM EDT Mon Oct 30 2017 Valid 00Z Tue Oct 31 2017 - 00Z Thu Nov 02 2017 ...Heavy snow possible over parts of the Northern Rockies... ...Heavy snow possible over parts of the Northern Wisconsin and the extreme western parts of the Upper Peninsula of Michigan... ...Heavy rain possible over parts of the Western Gulf Coast... A deep upper-level low over James Bay will slowly move northeastward to the Davis Strait by Wednesday. Upper-level energy over the Central Plains/Middle Mississippi Valley will move eastward around the upper-level low to Maine by Tuesday afternoon then moving into Eastern Canada by Wednesday. Light snow and rain will develop over parts of Upper Great Lakes/Upper Mississippi Valley through Tuesday morning. Tuesday into Wednesday, lake enhanced snow will develop over over parts of Upper Great Lakes that will begin to wane on Wednesday. In addition, rain will develop over the parts of the Ohio Valley into the Lower Great Lakes that will end over the Ohio Valley by early Tuesday morning. The rain over the Lower Great Lakes will also wane by Wednesday morning. Meanwhile, upper-level energy over Northwestern Mexico and upper-level energy over the Northern High Plains will merge together over the Central/Southern Rockies and move eastward to the Middle/Lower Mississippi Valley into the Ohio Valley by Wednesday. Light snow will develop over parts of the Central Rockies through Tuesday afternoon. Moisture from the Gulf of Mexico will move northward over the Southern Plains into the Central High Plains starting overnight Monday into Tuesday evening. Tuesday into Wednesday, the moisture axis will move eastward into the Lower Mississippi Valley by Wednesday. The energy will aid in producing showers and thunderstorms over parts of the Southwest by late Monday night that will move into the Southern Rockies/Southern High Plains by Tuesday morning. On Tuesday rain will move into the Southern/Central Plains that will move into parts of the Southern Ohio/Middle Mississippi Valley and the Tennessee Valley by Wednesday morning. Showers and thunderstorms will redevelop over the Western Gulf Coast by Tuesday morning that will expand into parts of the Lower Mississippi Valley by Wednesday. Furthermore, a front over Northwestern Canada will move southward into the Northern Rockies/Northern Plains on Tuesday evening into Wednesday. Rain and snow will develop over parts of the Northern High Plains overnight Tuesday expanding into parts of the Northern Plains by Wednesday. Similarly, snow will develop over parts of the Northern Rockies that will become heavy at times Tuesday evening into Wednesday morning. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php