Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 349 AM EDT Mon Sep 07 2020 Valid 12Z Mon Sep 07 2020 - 12Z Wed Sep 09 2020 ...There are winter weather advisory and winter storm watches along parts of the Northern/Central Rockies/High Plains... ...Excessive heat and potential new daily temperature records through Tuesday... ...Critical/extreme conditions for wildfires persist across the West and Northern/Central Rockies through midweek... A robust low pressure system and surface front crossing through the Great Lakes to the Northeast will cause scattered to widespread showers and thunderstorms from the Plains to Great Lakes. Cool, Canadian air will filter and settle into the Rockies and Plains as surface high pressure slides south in the wake of the cold front. A significant cool down is expected to parts of the Northern/Central Rockies and the surrounding areas. Snow will be possible at higher elevations for this area with this early season cold blast. Winter Weather Advisories and Winter Storm Watches are in effect for portions of the Northern/Central Rockies Monday evening into Tuesday. Freeze Watches are in effect across most of North Dakota. Oppressive heat rages on across a large portion of the West through Labor day and into Tuesday. With temperature values reaching/sustaining upwards of 30 degrees above average, several locations may set new daily temperature records. Strong, gusty winds will develop ahead of an approaching cold front from the north; which will keep critical conditions (extreme across northwest Oregon) in place today and Tuesday, further drying out fuels (grass, trees, shrubs, dried leaves etc). The slightest of sparks could cause a wildfire that quickly spreads out of control. Excessive Heat Warnings are in effect from southwest Oregon to southern Arizona. Red Flag Warnings cover the Pacific Northwest, Great Basin and the Northern/Central Rockies. As the cold front pushes south, cooler air will filter into the region reducing the extent of current heat wave. The stronger winds will also help in clearing out the smokey air trapped in the valleys across the region. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php