Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 416 PM EDT Tue Oct 19 2021 Valid 00Z Wed Oct 20 2021 - 00Z Fri Oct 22 2021 ...Winter weather for parts of the Northern Rockies and Northern Plains... ...Rain is moving into Northern California... ...There is an Elevated Risk of fire weather over parts of the Central/Southern High Plains... A wave of low pressure over the Central Plains moves eastward to the Great Lakes by Thursday while trailing a front from the Great Lakes to the Southern High Plains. The system will produce snow and lower elevation rain over parts of the Northern Rockies into the Northern High Plains on Tuesday evening. Overnight Tuesday, the snow will move onto the Northern Plains before ending on Wednesday morning. Therefore, Winter Storm Warning and Winter Weather Advisories are posted over parts of the region. Meanwhile, showers and thunderstorms will develop over parts of the Central Plains on Tuesday evening. Showers and thunderstorms will move into the Northern Plains and parts of the Upper/Middle Mississippi Valley by Wednesday morning, moving into the Great Lakes/Ohio Valley by Thursday morning. By Thursday evening, showers and thunderstorms will move into the Lower Great Lakes/Central Appalachians. In the meantime, moisture from the Gulf of Mexico will flow northward over the Central Gulf Coast on Wednesday, producing showers and thunderstorms over parts of the Central Gulf Coast. Showers and thunderstorms will expand into parts of the Tennessee Valley overnight Wednesday into Thursday morning. The area of showers and thunderstorms will merge with the showers and thunderstorms over the Central Appalachians by later Thursday morning into Thursday evening. Moreover, gusty winds and low humidity over the Central/Southern High Plains lead to an Elevated Risk of fire weather over the region through Wednesday morning. Therefore, Red Flag Warnings are over parts of the Central High Plains. Along the West Coast, a front moves onshore by Wednesday morning and then dissipates by Wednesday evening. Rain will move onshore over parts of Northern California and the Pacific Northwest overnight Tuesday. The rain extends into parts of the Northern Intermountain Region by Wednesday evening. Rain tapers off over the Pacific Northwest Thursday morning before returning to parts of the Northwest Coast by Thursday evening. Lastly, an area of low pressure will produce scattered rain showers over the Northeast through Wednesday evening before moving away from the area. Ziegenfelder Graphics are available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php