Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 423 PM EDT Tue Oct 25 2016 Valid 00Z Wed Oct 26 2016 - 00Z Fri Oct 28 2016 ...Heavy rain possible over parts of the Upper Mississippi Valley... ...Heavy rain possible over parts of the Pacific Northwest and Northern California... ...Snow over parts of the Northern Appalachians... Low pressure over the Northern/Central Plains will move eastward to the Lower Great Lakes/Ohio Valley by Thursday. The system will produce rain north of the low and showers and thunderstorms south of the low over parts of the Northern Plains into parts of the Upper/Middle Mississippi Valley on Tuesday evening. The showers and thunderstorms will expand into the Central/Southern Plains by Wednesday morning that will move eastward into the Central Appalachians and parts of the Ohio/Tennessee Valleys by Thursday morning. The rain will move eastward into the Great Lakes and parts of the Ohio Valley/Mid-Atlantic/Northeast by Thursday morning, too. Meanwhile, upper-level energy over parts of the Northern Intermountain Region into parts of the Great Basin will move northward into West-Central Canada by Wednesday evening. The energy will produce rain over parts of the Northern Rockies/Intermountain Region into parts of the Central Rockies that will move northward into parts of the interior Pacific Northwest and Northern Intermountain Region on Wednesday, ending by Wednesday evening. Additionally, a plume of moisture will move into the Pacific Northwest/Northern California Coast Tuesday evening into Thursday as the next front moves onshore over the West Coast Wednesday into Thursday. Rain will develop along the Pacific Northwest/Northern California Coast Tuesday evening into Thursday. Elsewhere, upper-level energy over the Northeast will aid in producing rain and snow over the highest elevations of the Northern Appalachians and parts of Northern New England through Wednesday evening. In addition, easterly flow off the Atlantic will trigger showers and thunderstorm over parts of southeastern Florida Wednesday morning into Thursday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php