Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 357 PM EDT Mon Aug 22 2016 Valid 00Z Tue Aug 23 2016 - 00Z Thu Aug 25 2016 ...Below average temperatures expected from the Ohio valley to the Northeast... ...Temperatures will steadily warm across the Pacific Northwest by midweek... ...Stationary front to keep scattered showers and storms possible across the southern states... Much of the eastern U.S. is experiencing a break from the heat now that a cooler air mass has spilled in behind the frontal passage. Below average temperatures are forecast from the Ohio valley to the Northeast to range 5 to 10 degrees cooler than average. High pressure will remain over the Eastern Seaboard through midweek; resulting in cooler and dry conditions. Showers and thunderstorms will steadily increase by Wednesday morning and beyond over the Great Lakes, Ohio Valley and Middle Mississippi Valley as a sprawling cold front pushes east through the central U.S. Temperatures will slowly warm to near or slightly above normal across the East. The trailing end of the front will be remain stationary over the Southeast and the Deep South over the next few days. This boundary will serve as a focus for showers and thunderstorms to develop daily. Farther west, monsoonal moisture will keep scattered showers and storms in the forecast for the southwestern U.S. as well. The cold front front that brought an end to the excessive heat across the Pacific Northwest will continue east and cross the Intermountain West and spill into the northern and central High Plains. As it reaches the Plains, showers and thunderstorms will begin to develop along and ahead of the front. Some of the storms may become severe along the Middle Missouri River Valley across Nebraska, Iowa and northwest Missouri on Tuesday- possibly producing heavy rainfall as well. High pressure aloft will attempt to build partially back into the Northwest by mid-week, and temperatures will rise once again as a result. By Wednesday, temperatures are forecast to be 5 to 15 degrees above average across the Pacific Northwest. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php