Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 403 PM EDT Mon Oct 24 2016 Valid 00Z Tue Oct 25 2016 - 00Z Thu Oct 27 2016 ...Heavy rain possible over parts of the Upper Mississippi Valley... ...Heavy rain possible for parts of the Pacific Northwest and Northern Sierras... ...Snow possible for the highest elevations of Northern New England... Low pressure over the Northern High Plains will move southeastward to the Middle Missouri Valley by Wednesday. The system will produce rain over parts of the Northern Plains into parts of the Middle Missouri Valley overnight Monday into Tuesday morning that will move into the Upper Mississippi Valley/Upper Great Lakes/Western Ohio Valley by Wednesday morning. Showers and thunderstorms will develop over parts of the Middle Mississippi Valley on Tuesday afternoon into Tuesday evening that will expand into parts of the Central Plains and Oklahoma by Wednesday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php