Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 404 AM EDT Mon Oct 19 2020 Valid 12Z Mon Oct 19 2020 - 12Z Wed Oct 21 2020 ...Continued much above average to record high temperatures for the Southwest into California along with continued poor air quality near ongoing fires.... ...Accumulating snow and freezing rain possible from the Northern High Plains and accumulating snow into the Upper Mississippi Valley... ...Temperatures will be 10 to 20 degrees below average over parts of the Northern High Plains and Northern Plains into parts of the Middle Mississippi Valley... A slow moving storm over the Northern High Plains will move to the Upper Great Lakes by Wednesday. The system will produce snow, rain, and embedded freezing rain over the area. The mix of precipitation may cause hazardous diving conditions with slippery roads and reduce traction. As the system moves into the Upper Midwest, snow and rain will be the prime hazards with snow accumulating 2 to 6 inches. Hazardous driving conditions with the snow will be reduced traction and slippery roads. Similarly the rain will produce hazards to driving of wet and slippery roads. In addition, temperatures will be 10 to 20 degrees below average over parts of the Northern High Plains and Northern Plains into parts of the Middle Mississippi Valley. Meanwhile, much above average temperatures will continue from California, through the Southwest and into the Great Basin. Much of this region will see high temperatures 10 to 15 degrees above average, with additional record high maximum and record high minimum temperatures possible across portions of California into the Southwest. With no changes to the overall pattern affecting the West Coast, air quality will remain poor near ongoing fires, especially in the central California valley region. Additionally, a front across the Middle/Lower Mississippi Valley into the Ohio Valley and the Northeast will produce rain and showers/thunderstorms. The rain will produce hazards to driving with wet and slippery roads with the added slipperiness of wet leaves. The thunderstorms will produce hazards similar to rain but with the added hazards of frequent lightning and wind gust. Furthermore, onshore flow off the Atlantic will aid in producing rain over parts of Florida. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php