Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 415 PM EDT Sat Oct 31 2020 Valid 00Z Sun Nov 01 2020 - 00Z Tue Nov 03 2020 ...Rain and snow from Great Lakes to Northeast... ...Cold air shifts into East from Mid-west while West experiences a warm up... An area of low pressure is forecast to traverse southeastern Canada over the next couple of days. This system will produce light rain and snow showers across the Upper Great Lakes tonight. Rain and snow moves east into Lower Great Lakes and Northeast tomorrow and Monday as the associated upper-level trough deepens. Some areas down-wind of lakes Eerie and Ontario may see enhanced lake effect snow, while parts of the Northern Appalachians may see terrain enhanced snowfall on Sunday and Monday. The Mid-Atlantic may experience increased rain rates, and the potential for scattered thunderstorm activity along a surface trough draped across North Carolina's coastal plain as a weak area of low pressure develops over Maryland's eastern shore. This area of low pressure will eventually link up with the dominant Canadian system on Monday and continue on through the Northeast and eventually into the Gulf of St. Lawrence by Monday night. High pressure, currently stationed over the Rockies, will shift eastward pulling cold air south and into the Mid-west tomorrow. This cold air mass is likely to drop temperatures up to 20 degrees below average over parts of the Mid-west. Sunday night lows are not expected to be much warmer as lows are likely to bottom out in the low 30s across much of the Mississippi/Tennessee Valleys. Some isolated areas may experience their first freeze of the season. The cold air will shift east on Monday leading to the potential for many places along the East Coast breaking temperature records. Meanwhile, a deep upper-level ridge will build over the western U.S. tomorrow and Monday. This ridge will create the potential for record breaking warmth over parts of the Great Basin and California. Temperatures are expected to be over 15 degrees above average for parts of the northwest on Monday due to the aforementioned ridge. Kebede Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php