Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 310 AM EDT Sat Nov 02 2019 Valid 12Z Sat Nov 02 2019 - 12Z Mon Nov 04 2019 ...Fire weather threat across the west is diminishing... ...Lake effect snow event possible downwind of the Great Lakes... ...Air Stagnation Advisory up over parts of the Pacific Northwest and Northern Intermountain Region... A front extending from the Lower Great Lakes southward to the Western Gulf Coast will slowly move eastward and dissipate by Sunday. The system will produce snow and rain showers over parts of the Great Lakes through Sunday morning. In the wake of the storm, on Sunday, lake effect snow will develop downwind from the Great Lakes through late Sunday night. A second weak front moving southeastward from South-Central Canada will move eastward to the Great Lakes and southward to the Middle Mississippi Valley/Central Plains by Monday. The system will produce an area of rain and snow over parts of the Northern Plains/Northern High Plains on Sunday morning, ending on Monday. Snow and rain will develop over parts of the Upper Mississippi Valley/Upper Great Lakes overnight Sunday into Monday. Meanwhile, a lingering boundary over Southern Florida will aid in producing scattered showers and thunderstorms over the area through Monday. In addition, calmer winds are expected across California that will bring some relief from the recent life threatening fire weather conditions, although the large scale pattern will remain unfavorable for much needed precipitation. Furthermore, there is a narrow region of elevated to critical risk of Fire Weather over parts of Southern California on Saturday. Additionally, with an upper-level ridge over parts of the Northwest and high pressure at the surface, conditions will be favorable for air stagnation over parts of the Pacific Northwest and the Northern Intermountain Region. With downward moving air at the upper-levels and light winds at the surface, smoke and other pollutants will be slow to move out of the region. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php