Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 254 AM EST Thu Mar 07 2019 Valid 12Z Thu Mar 07 2019 - 12Z Sat Mar 09 2019 ...Heavy snow possible over the Northern/Central Rockies into the Upper Great Lakes/Upper Mississippi Valley on Saturday... ...Heavy snow possible over the higher elevation across the West... ...Freeze Warnings are in place again on Thursday morning for the Southeast... A deep upper-level low over parts of the Northwest will slowly weaken and move eastward to the Canadian Prairies by Saturday. Energy racing out over the Plains and the Great Basin will move eastward off the Mid-Atlantic Coast by Friday evening. Snow will develop over parts of the Northern/Central Plains and move to the Middle Mississippi/Ohio Valleys overnight Thursday and into the Mid-Atlantic/Central Appalachians by Friday afternoon. The precipitation will move off the Mid-Atlantic Coast by Saturday. Moisture will stream northward from the Gulf of Mexico into Lower Mississippi Valley on Thursday and into parts of the Tennessee Valley on Friday. The moisture will aid in developing rain over parts of the Western Gulf Coast on Thursday afternoon and expand into parts of the Middle Mississippi and Tennessee Valleys overnight Thursday. Showers and thunderstorms will also develop over parts of the Lower Mississippi Valley by early Friday morning and into parts of the Tennessee Valley by Friday evening. Rain will develop over parts of the Southern Mid-Atlantic Friday evening into Saturday. Rain and higher elevation snow will develop over parts of the California into the Great Basin on Thursday. Snow will also develop over interior parts of the Pacific Northwest into parts of the Northern/Central Rockies on Thursday, too. Additional energy moving eastward over the Pacific will rotate around the upper-level low moving into California by Thursday evening and advancing eastward to the Northern/Central Plains by Saturday. The energy will aid in producing an increase of snow over parts of the Great Basin on Friday that will expand into the Northern/Central Plains overnight Friday and into parts of the Upper Mississippi Valley by Saturday. Elsewhere, the eastern half of the U.S. is expected to have below average temperatures and Freeze Warnings are in place for the Southeast for Thursday morning before that area warms up on Friday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php