Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 358 AM EDT Tue Aug 6 2013 Valid 12Z Tue Aug 6 2013 - 12Z Thu Aug 8 2013 ***Slightly warmer and more humid for the Eastern U.S.*** ***Stormy weather for the Central Plains and into the Midwest*** ***Scattered showers and storms over the Intermountain West*** After several days of very pleasant weather over the Eastern U.S., the airmass over the region is expected to modify and become increasingly humid through the middle of the week as the surface high moves offshore. The good news is that temperatures should remain below 90 degrees with no sign of any heat wave coming. This pattern change will also increase the chances for showers and thunderstorms as moisture arrives from the Midwest states. The presence of a quasi-stationary frontal boundary over the Central Plains and into Missouri, along with an approaching cold front from the Dakotas, will keep a zone of active weather going through mid-week. This includes areas that have already been hammered by numerous thunderstorms and heavy rainfall. This will also include the Upper Midwest and into the Great Lakes region in advance of the cold front, which will deliver another quality airmass from Canada behind it. Elsewhere, isolated to scattered convection can be expected each afternoon over the Four Corners region with the monsoonal moisture in place. Afternoon sea breeze convection is likely over the Florida Peninsula each afternoon. It will remain hot and humid over the Deep South states and into Texas, which are expected to remain south of the main frontal zone. Heat indices may approach 110 degrees in some of these areas where the combination of high temperatures and high dewpoints is greatest. Hamrick Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php