Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 332 AM EDT Tue Oct 16 2018 Valid 12Z Tue Oct 16 2018 - 12Z Thu Oct 18 2018 ...Heavy rain possible over parts of the Southern Plains... ...Isolated heavy snow possible over parts of the Central Rockies while scattered snow develops over the Southern Rockies... ...Rain/freezing rain possible over parts of New Mexico... ...Santa Ana Wind over Southern California should gradually abate the next couple of days... Cold high pressure over the Central Rockies will move southeastward into the Southern High Plains by Tuesday evening into Wednesday evening. The cold air mass will bring temperatures that will be 20 to 35 degrees below average over parts of the Southern Plains into parts of the Lower Mississippi Valley. Clock-wise circulation around the area of high pressure and moisture from the Western Gulf of Mexico will aid in developing rain over parts of the Southern Plains through Wednesday evening into Thursday. Some areas of rain/freezing rain will develop over Southwestern Texas through Tuesday evening. In contrast, an upper-level low over the Southwest will be quasi-stationary through Wednesday evening. The energy will aid in producing scattered rain and higher elevation snow over parts of the Southwest/Great Basin and Southern Rockies through Wednesday evening, too. Areas of rain/freezing rain will develop over parts of New Mexico through Thursday morning. Meanwhile, a quasi-stationary front extending from parts of the Southern Mid-Atlantic southwestward into the Central Gulf Coast with an area of low pressure off the Western Gulf Coast through Wednesday evening. Moisture from the Gulf of Mexico will pool along the boundary aiding in the development of showers and thunderstorms from parts of the Mid-Atlantic/Southeast into the Western Gulf Coast through Wednesday. Diurnal heating will aid in producing maximum areal coverage over parts of the Southeast into parts of the Eastern/Central Gulf Coast during the afternoon into evening hours. Elsewhere, one area of upper-level energy follow by another area will transit across parts of the Great Lakes into the Northeast Tuesday into Wednesday evening. The energy will produce scattered areas of rain and snow over parts of the Great Lakes into parts of the Northeast through Wednesday evening. In addition, strong high pressure over Central/Northern Rockies will aid in producing strong wind over parts of Southern California. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php