Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 304 AM EST Mon Nov 04 2013 Valid 12Z Mon Nov 04 2013 - 12Z Wed Nov 06 2013 ...Snow moves out of the Northern/Central Rockies onto the Central Plains into the Upper Great Lakes... ...Temperatures will be 10 to 15 degrees below average for parts of the Great Basin/Northern Rcokies/Northern High Plains... A slow moving front extending from the Upper Mississippi Valley southward to the Southern High Plains will advance to the Upper Great Lakes/Southern Plains by Tuesday evening. Upper-level energy associated with the system will move northeastward from the Central High Plains into South-Central Canada by late Monday night. Moisture from the Gulf of Mexico will accompany the energy aiding in the development of light rain over parts of the Upper Mississippi Valley/Upper Great Lakes on Monday. Additional upper-level energy over the Northern Intermountain Region will dig southeastward to the Southern Rockies by Tuesday evening. The energy will produce light snow over parts of the Northern Rockies into parts of the Central Rockies/Great Basin on Monday. Meanwhile, a new surge of moisture from the Gulf of Mexico will move northward over the Plains into parts of the Mississippi Valley. This plume will be richer in moisture that the previous one that advanced into the Upper Midwest on Monday. The moisture will also pool along the front aiding in the development of rain over part of the Southern Plains on Monday, that will expand northeastward over parts of the Middle Mississippi Valley into the Upper Great Lakes by Tuesday evening. Showers and thunderstorms will develop along and ahead of the boundary over parts of the Southern/Central Plains on Tuesday evening. On the northwest side of the precipitation shield, snow will develop over parts of the Central High Plains late Monday night moving into parts of the Northern/Central Plains and the Upper Mississippi Valley/Upper Great Lakes on Tuesday. In the meantime, moisture pushing northward out of Mexico will trigger showers and thunderstorms over parts of the Southwest/Southern Rockies on Monday evening into Tuesday morning. A weakening front will move into the Pacific Northwest Monday into Tuesday. An accompaning plume of Pacific moisture will likewise move into the Northwest producing coastal rain that will expand inland on Monday. The system will produce rain and higher elevation snow over parts of the Pacific Northwest extending into the Northern Rockies on Tuesday. Elsewhere, easterly flow off the Atlantic will produce light rain over parts of the Southeast Coast and showers/thunderstorms over the southern tip of Florida through Tuesday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php