Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 320 AM EDT Thu Oct 03 2019 Valid 12Z Thu Oct 03 2019 - 12Z Sat Oct 05 2019 ...There is a slight risk of excessive rainfall over parts of the Southern Rockies/Southwest... ...Temperatures will be 10 to 20 degrees below average over the Northern/Central Plains into parts of the Southern Plains and over parts of the Upper Mississippi Valley... ...Temperatures will be 10 to 20 degrees above average over parts of the Southern Plains into the Ohio Valley and the Mid-Atlantic/Southeast ... A strong cold front over the Ohio Valley southwestward to the Southern High Plains will move eastward to off most of the East Coast on Friday into Friday night. Along the western end of the front, moisture will pool along the boundary producing showers and thunderstorms through Friday morning. Some of the thunderstorms will produce heavy rain that will produce mainly localized scattered areas of flash flooding also through Friday morning. Additionally, the system will produce rain over parts of the Upper Mississippi Valley into the Great Lakes and parts of the Northern Mid-Atlantic through Friday when the rain moves of the Northeast Coast. Some showers and thunderstorms will develop along the southern edge of the precipitation shield on Thursday into Friday morning. Also, showers and thunderstorms will continue to develop over parts of the Southwest/Southern Rockies and expand into parts of the Southern Plains/Lower Mississippi Valley on Thursday into Friday evening. In addition, locations behind the front in the Great Lakes are seeing temperatures that are up to 30 degrees colder than at this time yesterday. Ahead of the front, exceptionally warm air is breaking dozens of daily high temperature records all across the Southern Plains, Southeast, Mid-Atlantic, and Southern New England. Once the front passes the Mid-Atlantic, is will feel more fall-like, with temperatures expected to be near to slightly below average. Meanwhile, the Southeast will not see much relief from the heat with the passing of this cold front. A second front moving onshore over the West Coast will move inland to Northern Plains into parts of the Southern High Plains on Friday night into Saturday. Rain will develop along the Pacific Northwest Coast and move into parts of the Northern Rockies on Friday producing higher elevation snow and lower elevation rain through Saturday morning. As the system moves eastward, moisture will stream northward over the Plains aiding in the development of showers and thunderstorms over parts of the Central Plains. On Friday evening, showers and thunderstorms will move into parts of the Middle Mississippi Valley by Saturday as rain develops over parts of the Upper Mississippi Valley. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php