Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 257 AM EST Thu Dec 05 2019 Valid 12Z Thu Dec 05 2019 - 12Z Sat Dec 07 2019 ...Light snow expected for the Great Lakes region into the Northeast... ...Unsettled weather for the Four Corners region today, moving eastward toward the south-central and southeastern US... ...Precipitation chances increase for the West Coast on Friday... Reasonably quiet weather is expected for the end of the week compared to the active pattern over the past couple of weeks. Snow is expected to fall across the Great Lakes and into the Northeast due to lake enhancement and then a clipper system moving across those regions. Total snowfall accumulations will generally be 1 to 3 inches, with accumulations up to 6 inches locally. Precipitation is forecast for the Four Corners region today behind a surface low pressure system--a few Winter Weather Advisories remain in effect for the Central/Southern Rockies through this afternoon. As the low moves eastward, rain showers and a few thunderstorms will develop across the Southern Plains to Lower/Middle Mississippi Valley this evening, spreading into the Tennessee Valley and Southeast Thursday night into Friday. Rainfall totals should generally be a half an inch or under. An upper-level low spinning over the Eastern Pacific will cause a front to slowly approach the West Coast Friday. Precipitation should increase in the West Friday into Saturday, with locally heavy rain and some localized flooding forecast for lower elevations of northern California. Snow is likely in higher elevations of the Shastas and Sierra Nevada. By Saturday, precipitation will spread into the Intermountain West. Generally dry conditions should persist elsewhere over the U.S., but stagnant air could lead to air quality concerns over the West Coast to Intermountain West. Warmer than average temperatures over the Southern/Central Plains to Mississippi Valley on Thursday will cool down on Friday after a cold frontal passage. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php