Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 408 PM EDT Sat Jul 27 2019 Valid 00Z Sun Jul 28 2019 - 00Z Tue Jul 30 2019 ...Showers and thunderstorms are expected across portions of the Upper Midwest through the weekend with localized flash flooding possible... ...Monsoonal moisture could lead to localized flooding from Colorado to the Four Corners region through tonight... ...Heat and humidity will be a concern for interior central and southern California for the next few days... An expansive area of high pressure will continue to provide relatively pleasant and dry conditions for late July for much of the interior sections of the South. However, heat and humidity will be on the increase ahead of an advancing cold front moving across the Northern Tier. The heat is expected to spread into New England on Monday along with an increasing chance of thunderstorms. The cold front was in response to an upper-level impulse now moving across the Pacific Northwest. The front is forecast to move quickly eastward, bringing scattered thunderstorms across the northern Plains on Sunday, reaching the Great Lakes, the Midwest and into the mid-Mississippi Valley on Monday. Some of the rainfall could lead to flash flooding over the northern Plains today, and over the upper Midwest on Sunday. Meanwhile, showers and thunderstorms associated with monsoonal moisture could lead to localized heavy rain over the central Rockies through this evening. As the upper-level impulse quickly moves eastward into the northern Plains on Sunday, more stable air should decrease the rain chances for the central Rockies and the Four-Corners region for Sunday and into Monday. The remainder of the West will be very dry with an elevated fire danger especially across portions of the Pacific Northwest, northern Rockies and far northern High Plains over the next couple of days. Heat and humidity will remain a concern for interior central and southern California as afternoon temperatures approach 110 degrees for the next few days. A front will remain stalled across the Florida Peninsula, where a good chance of showers and thunderstorms will continue for the next few days. The chance of thunderstorms will extend westward to include coastal Louisiana and Texas into early next week. Kong Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php