Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 359 PM EDT Thu Apr 05 2018 Valid 00Z Fri Apr 06 2018 - 00Z Sun Apr 08 2018 ...Heavy rain possible over the California/Pacific Northwest and the Lower Mississippi/Tennessee Valleys... ...Heavy snow possible over parts of the Central Plains ...Snow over parts of the Cascades, Sierras, the Northern/Central Rockies, Great Lakes/Northern New England, and Ohio Valley/Central Appalachians/Southern Mid-Atlantic... ...Temperatures will be 20 to 35 degrees below average over the Northern/Central Plain into Upper/Middle Mississippi Valley... One front followed by another front will move into the Pacific Northwest and Northern/Central California with the second boundary moving inland to the Northern Rockies/Great Basin and California by Saturday. Moisture from the Pacific will stream into Northern/Central California through Saturday, too. The systems will produce rain over most of the Pacific Northwest into Northern California with rain and higher elevation snow extending into the Northern Rockies by Thursday evening. The rain will expand southeastward into Central California and the Great Basin by Friday morning and into parts of Southern California by Friday evening. On Saturday when the second boundary moves inland, the snow levels will lower over the Northwest into the Northern Rockies with snow developing over higher elevations of the Pacific Northwest into Northern California and over parts of the Northern Rockies by Saturday afternoon into evening. Meanwhile, a strong cold front along the foot hill of the Northern Rockies into the Central High Plains will sink southward to the Southern Rockies and the Texas/Mexican border into the Western Gulf Coast by Saturday. Very cold air will move into the Plains and most of the Mississippi Valley by Saturday, too. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php