Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 416 PM EDT Mon May 16 2016 Valid 00Z Tue May 17 2016 - 00Z Thu May 19 2016 ...There is a slight chance of severe thunderstorms over parts of the Southern Plains... ...Heavy rain possible over Nebraska, Oklahoma, and into Missouri... ...Heavy rain possible over the Central Gulf Coast and over parts of Florida... ...Temperatures will be 10 to near 20 degrees below average from the Central Appalachians westward to the Central/Southern Rockies and Southern Plains... An upper-level low over the Great Basin will slowly sink southward to the Southwest by Wednesday. The energy will aid in producing showers and thunderstorms from parts of the Northern Intermountain Region southward to the Great Basin/Southwest and extending eastward to the Middle/Lower Mississippi Valley that will end over the Northern Intermountain Region/Northern Rockies by Tuesday morning. Also on Tuesday, the showers and thunderstorms will expand southward into parts of the Southwest/Southern Rockies into parts of the Southern Plains that will continue through to Wednesday. Overnight Monday, rain will develop over parts of the Ohio Valley and expand eastward into the Mid-Atlantic by Tuesday morning and continue through Wednesday. In addition, showers and thunderstorms will develop over parts of the Southeast through Wednesday, too. Meanwhile, a weak boundary over the Great Lakes will continue to weaken while moving eastward off the Northeast Coast by Tuesday evening. The system will produce rain over parts of the Upper Mississippi Valley/Upper Great Lakes on Monday evening that will move into the Ohio Valley by Tuesday morning and become absorbed into the precipitation shield moving eastward from the Mississippi Valley by Tuesday evening. Additionally, an upper-level low over Southeastern Canada will move eastward away from the Northeast on Monday evening. The energy will aid in producing rain showers over parts of Northern New England through early Tuesday morning. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php