Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 331 PM EDT Mon Sep 19 2016 Valid 00Z Tue Sep 20 2016 - 00Z Thu Sep 22 2016 ...Heavy rain to continue along portions of the Eastern Seaboard... ...Showers and thunderstorms to increase across the Southwest as tropical cyclone Paine moves toward northern Baja California... ...Precipitation and below average temperatures expected across the northwestern U.S. by Wednesday... A weak, moisture-laden frontal boundary extending along the East Coast from southern New England to the Southeast is expected to remain a focus for showers and thunderstorms through Wednesday. Heavy rainfall accumulations are possible, especially from eastern North Carolina to the southern Delmarva as the slow moving remnant circulation associated with post tropical cyclone Julia interacts with an upper level low approaching from the west. To the west, a cold front will continue to advance across the Midwest into the Northeast this period with scattered showers and thunderstorms. Some of these storms may be strong to severe as the front moves across the Great Lakes and mid Mississippi valley Monday afternoon and evening. The frontal boundary will become stationary across the plains Tuesday into Wednesday, with scattered showers and storms possible from the northern Rockies into the Midwest. Low pressure developing along the front may help to focus some locally heavy rains as it lifts northeastward into the upper Midwest on Wednesday. Hurricane Paine, which is currently well west of southern Baja California in the eastern Pacific, is expected to weaken as it tracks to the north -- dissipating as it reaches northern Baja California Wednesday morning. However, moisture streaming out in advance of the cyclone is expected to help fuel showers and thunderstorms across portions of the southwestern U.S., including southern California, Arizona, southern Utah, New Mexico and southwestern Colorado. Some of these storms may produce locally heavy amounts across the region. Precipitation and cooler temperatures are expected to spill across the Pacific Northwest and the northern Rockies as a well-defined upper level low develops and drops south into the region on Wednesday. Pereira Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php