Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 340 PM EDT Sat Nov 04 2017 Valid 00Z Sun Nov 05 2017 - 00Z Tue Nov 07 2017 ...Heavy rainfall and flash flooding possible on Sunday across the Ohio Valley and lower Great Lakes... ...Heavy snow possible across the higher elevations of the Pacific Northwest and Central and Northern Rockies... ...Above normal temperatures expected across much of the Southern and Eastern U.S... With a deep trough in place across the western U.S. a relatively warm and humid airmass will build across the south-central and eastern U.S. over the next several days. Above normal temperatures are expected across eastern Colorado and much of the southern plains south of a frontal boundary today. A warm front will push northeastward across the Great Lakes allowing the warmth and humidity to spread into the Ohio Valley and lower Great Lakes. A cold front will emerge from the western U.S. and push across the Plains, reaching the Great Lakes on Monday. The interaction of the cold front with the warm and humid airmass ahead of it will lead to a period of heavy rainfall along and ahead of the front across the Ohio Valley and lower Great Lakes. Flash flooding will be a concern across the region. A deep trough over the Western U.S. will bring a period of active weather and cooler temperatures. Heavy snow is expected across the northern and central Rockies today behind a cold front crossing the region. The frontal boundary will become stalled across the central Rockies leading to a more prolonged period of snowfall across western Colorado and southern Wyoming. A second low pressure center will come ashore in the Pacific Northwest on Sunday bringing another round of snowfall to the Cascades and northern Rockies. Krekeler Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php