Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 443 AM EDT Sun Oct 09 2016 Valid 12Z Sun Oct 09 2016 - 12Z Tue Oct 11 2016 ...Hurricane Matthew is forecast to become a post tropical extratropical low off the Carolina Coast... ...Heavy rain possible across parts of the Pacific Northwest... ...Snow for parts of the Northern Rockies/Northern High Plains... Hurricane Matthew is forecast to become a post-tropical extratropical low off of Cape Hatteras and move eastward away from the East Coast. The heavy rain associated with the storm will slowly end over the Mid-Atlantic Coast by Sunday afternoon and over parts of Cape Cod by Sunday night. The rain along the Northeast Coast will end by Monday afternoon. In addition, the front over the Northeast into the Mid-Atlantic will move off the coast by Sunday morning. For more information on specific threats associated with Hurricane Matthew along with its most current track and intensity, see the National Hurricane Center (www.hurricanes.gov). Meanwhile, upper-level energy over the Southern Rockies/Southern Plains will move northeastward to parts of the Middle Mississippi/Western Ohio Valleys by Tuesday. Moisture over the Southern High Plains into the Southwest along with the upper-level energy will aid in producing showers and thunderstorms over parts of the Southwest eastward to parts of the Southern High Plains, on Sunday morning. The showers and thunderstorms will move into parts of the Central Plains/Middle Mississippi Valley by Monday evening. Additionally, a front over the Pacific Northwest will move eastward to the Northern Plains/Upper Mississippi Valley by Monday. A plume of moisture off the Pacific will stream into the Pacific Northwest with some of the moisture traveling as far inland as the Northern Plains. The system will produce rain over parts of the Northwest inland to parts of the Northern Rockies on Sunday. Overnight Sunday, cold air from Western Canada will move into parts of the Northern Rockies/Northern High Plains producing snow over parts of the area through Tuesday morning. The moisture plume over the Northwest Coast will weaken by Monday afternoon, likewise, the rain over the Pacific Northwest will wane by Monday evening. As the boundary continues to move inland, the rain will expand into parts of the Northern Plains on Monday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php