Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 405 AM EDT Sun Oct 27 2019 Valid 12Z Sun Oct 27 2019 - 12Z Tue Oct 29 2019 ...Unsettled weather moving across the Great Lakes and much of the East Coast today... ...Snow across the central Rockies today will spread into the central Plains on Monday... ...Critical to extreme fire weather threat today over parts of northern to central California... An active weather pattern is forecast to continue across the U.S. for the next couple of days. A deep low pressure system, partially associated with the former tropical storm Olga, will move across the Great Lakes today. Widespread showers and embedded thunderstorms ahead of the low pressure system are moving into much of the eastern U.S. including New England. The rain could lead to areas of flash flooding across the southern Appalachians today. By tonight, a new low pressure center is forecast to form near the southern New England coast and then move rapidly out into the Atlantic, bringing the rain to an end for the Mid-Atlantic region. Some rain is forecast to linger across New England through Monday evening due to the presence of an inverted trough. Temperatures are forecast to remain above normal for much of the eastern half of the country through Monday. In contrast, much colder than normal temperatures are expected to overspread the western half of the country as cold air surges down the Rockies and the High Plains for the next few days. In fact, 6 to 12 inches of snow is expected for the central Rockies today behind a strong cold front. The snow will then spread northeastward into the central Plains on Monday and into the upper Midwest Monday night where up to 6 inches of accumulation is forecast. In the meantime, a stronger push of cold air will move into the northern Rockies and northern Plains. Scattered areas of snow will once again progress down the northern Rockies and northern High Plains on Monday. Meanwhile, some tropical moisture is forecast to return for the eastern Gulf Coast into the Southeast Monday night and early Tuesday. On the other hand, critical fire weather conditions are expected to continue across the southwestern U.S., where the threat of fire is extreme over parts of northern California today into Monday with very gusty winds. Kong Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php