Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 424 PM EDT Fri Oct 16 2015 Valid 00Z Sat Oct 17 2015 - 00Z Mon Oct 19 2015 ...Flash flooding possible for portions of the southwestern U.S... ...Below average temperatures will spread from the Midwest into the eastern U.S... Several areas across California have already experienced excessive rain and flash flooding with the upper-level disturbance that's moving the Southwest. As this system continues on its way the potential for heavy rain and increased risk of flash flooding will spread to Nevada, Utah and Arizona through Monday morning. Rain amounts of 1 to 2 inches will be common across the Great Basin and surrounding areas, with 2.75 or possibly higher possible along the southern end of the Wasatch Range. Additional showers are expected this weekend across the Pacific Northwest as a frontal system moves onshore. This system will track across the Intermountain West on Sunday, bringing additional showers and thunderstorms with it. A strong cold front will continue to push through the eastern states tonight. The ridge over the central U.S. will reinforce the colder airmass that has surged into the areas in the wake of the front. Precipitation is expected through Sunday morning from the Great Lakes to far eastern New England and will taper off during the afternoon and evening hours. High temperatures on Saturday will range from 5 to 20 degrees below average across the eastern half of the country, with the coldest temperatures across parts of the Northeast. A series of upper-level disturbances will keep scattered showers in place from the Great Lakes to the Northeast even behind the front. Sufficient cold air may be in place for snow to mix in with the rain showers across portions of the Great Lakes and Northeast through much of the weekend. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php