Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 352 PM EDT Mon Oct 26 2015 Valid 00Z Tue Oct 27 2015 - 00Z Thu Oct 29 2015 ...Heavy rainfall possible over parts of the Eastern Gulf Coast... ...Heavy rainfall possible over parts of the Ohio Valley and Southern/Central Appalachians... A storm along the Central Gulf Coast will slowly move northward to the Western Ohio Valley becoming absorbed into a developing storm over the Upper Great Lakes on Wednesday. Circulation around the low will draw moisture off the Gulf of Mexico into the Southeast to the Lower Mississippi Valley. The system will produce rain, heavy at times, from the Lower Mississippi Valley eastward to the Southeast with a few areas of embedded thunderstorms that will expand into the Ohio Valley/Great Lakes and into the Mid-Atlantic/Southern New England on Tuesday into Wednesday. Meanwhile, upper-level energy over the Northern Rockies/High Plains will move southeastward to the Central Plains/Middle Mississippi Valley by Wednesday. The system will produce rain over parts of the Pacific Northwest eastward to the Northern Plains and over the Central Rockies with some snow at the highest elevations on Monday evening. The rain will move eastward to the Northern/Central Plains with the snow ending over the highest elevations by Tuesday evening. In addition, more upper-level energy over West-Central Canada will move southeastward to the Northern Plains while beginning to absorb the storm from the Gulf Coast by Wednesday. Furthermore, the energy will consolidate with the energy from the Northern Rockies by Wednesday as well. The complex system will produce a front over the Northern Plains extending southward to the Southern High Plains by Tuesday evening. The boundary will move eastward to the Upper Mississippi Valley/Upper Great Lakes and southward to the Southern Plains/Lower Mississippi Valley by Wednesday morning. Rain will develop over the Upper Mississippi Valley/Upper Great Lakes on Tuesday evening that will move into parts of the Northeast/Northern Mid-Atlantic by Wednesday morning, too. Additionally, a deep upper-level trough over the Eastern Pacific will begin to move into the West Coast by Wednesday morning. The energy will aid in developing rain along the Pacific Northwest Coast to Northern California by Tuesday evening that will expand into parts of the Great Basin/Central California by Wednesday morning. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php