Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 403 AM EDT Tue Sep 08 2020 Valid 12Z Tue Sep 08 2020 - 12Z Thu Sep 10 2020 ...Significant cool down for the central U.S. with snow in the Northern/Central Rockies... ...Extreme heat continues today for parts of California, the Great Basin and the Southwest then temperatures will return closer to normal by Wednesday... ...Critical to extreme risk of wildfires will continue through Wednesday for much of the interior West and Northern/Central Rockies... Canadian air surging south trough the Plains, Rockies, Intermountain West and West is causing temperatures to significantly cool down, as well as, spreading snow across the Northern Rockies/Central Rockies. Several locations could accumulate amounts of 6+ inches with 1 to 2 feet in the highest peaks. Winter Storm Warnings and Weather Advisories are scattered across the Rockies from southern Montana to southern Colorado. Freeze Warnings, Frost Advisories and Freeze Watches are in effect across western Montana, northern Idaho, eastern Colorado, western Nebraska, North Dakota and and northern Minnesota. As this cooler airmass settles into the Pacific Northwest and Great Basin the recent heat wave will relax, allowing daily temperatures to moderate. The cold front will continue to slowly push east through the end of the week, providing a focus for heavy rain and thunderstorms along and ahead of the front- especially for the Southern Plains and central U.S. A swath of heavy rain can also be expected across the upper Midwest north of the sharp front. Near the East Coast, tropical moisture will increase the chance of rain near a stationary boundary. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php