Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 307 PM EDT Thu Oct 09 2014 Valid 00Z Fri Oct 10 2014 - 00Z Sun Oct 12 2014 ...Heavy Showers and Thunderstorms expected from the Central High Plains and Front Range east across the Middle Mississippi and Ohio Valleys... ...Cold front to bring showers to the Pacific Northwest this weekend... Over the next couple of days, a front situated from portions of the Southern Plains east into the Ohio Valley and Mid-Atlantic region will be the focus for multiple waves of low pressure going through the weekend. One wave will impact the Ohio Valley, Mid-Atlantic and southern New England late Friday and Saturday with a stripe of light to moderate rainfall. Cooler temperatures will be noted too as high pressure builds across the Great Lakes and Northeast. Drier conditions should return to these areas by later Saturday and into early Sunday as the surface wave exits away from southern New England. Meanwhile, as an upper level trough of low pressure exits the Central Rockies and shears eastward into the Plains, an axis of heavy showers and thunderstorms is expected along and just north of the aforementioned frontal zone. The primary focus should be from the Front Range of Colorado eastward across the High Plains and stretching east along the aforementioned frontal zone into the Middle Mississippi Valley. Very heavy rainfall is expected with potential for locally several inches of rain and therefore a risk of flash flooding. A wave of low pressure helping to foster this activity will advance from the Southern Plains into the Lower Mississippi valley through the weekend. So the focus for heavier showers and thunderstorms will gradually shift east, and it is expected that the Rockies and immediate High Plains will get a chance to dry out by late in the weekend. Elsewhere, a cold front will sweep into the Pacific Northwest this weekend which will bring slightly cooler temperatures and a threat of showers. Much of the rainfall activity will be confined to the coastal ranges. Orrison Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php