Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 407 AM EDT Thu Oct 17 2013 Valid 12Z Thu Oct 17 2013 - 12Z Sat Oct 19 2013 ...Quick moving storm will produce rain from the Tennessee Valley to the Northeast... ...Heavy rain possible over the Western Gulf Coast... ...Temperatures will be 10 to near 20 degrees below average over the Northern/Central High Plains and Northern/Central Rockies... A quasi-stationary front over the Eastern Seaboard with a wave of low pressure over the Tennessee Valley that will move northeastward to Maine by Friday morning. The system will produce rain over parts of the Great Lakes/Ohio Valley and the Central/Southern Appalachians that will move northeastward to the Northeast by Friday morning, with the rain ending by Friday evening. Along the southern end of the front, showers and thunderstorms will develop along the Central Gulf Coast that will move eastward to the Southeast Coast, while a new wave of low pressure develops along the Southeast Coast on Friday. Another front extending from the Upper Great Lakes southwestward to the Central Rockies will mover southeastward to the Southern Plains to the Great Lakes by Friday evening. Associated upper-level energy will aid in producing rain over the Northern Plains that will move eastward to the Great Lakes by Friday. Upslope flow will aid in producing light snow over parts of the Northern High Plains through Friday. Additional upper-level energy will drop southeastward from the Northern Rockies to the Southern/Central Plains from Thursday evening into Friday evening. The energy will aid in producing scattered light snow over parts of the Northern/Central Rockies through Friday morning. In the meantime, return flow off the Western Gulf of Mexico will bring moisture northward over the Southern Plains aiding in the development of showers and thunderstorms over Southern Texas that will expand north and eastward to over parts of Texas and the Lower Mississippi Valley by Friday evening. Likewise, when the upper-level energy intersects the moisture, rain will develop over parts of the Central High Plains on early Friday morning moving eastward to parts of the Middle Mississippi Valley and the Southern Plains. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php