Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 245 PM EDT Fri Jul 06 2018 Valid 00Z Sat Jul 07 2018 - 00Z Mon Jul 09 2018 ...Cooler temperatures and drier weather on the way for much of the Eastern U.S... ...Hot and dry weather to continue for the Desert Southwest... ...Developing monsoon pattern will bring showers and thunderstorms to the Four Corners region... Showers and thunderstorms will develop along and ahead of a cold front which will be crossing the southern Mid-Atlantic region this evening and dropping down across the Southeast and Gulf Coast states on Saturday before then stalling out. This front will remain an active focus for showers and thunderstorms through the weekend across these areas, and locally heavy rainfall and at least an isolated threat of flash flooding will exist. Behind the front, cool high pressure will spread across the Great Lakes, Ohio Valley and the Northeast which will also filter south down across the Mid-Atlantic region. Much drier conditions will be noted and temperatures will be near to slightly below normal. Meanwhile, a cold front will be ejecting out across the northern High Plains and gradually the upper Midwest through the weekend, which will allow for a resurgence of hot temperatures across these areas. In fact, temperatures will locally be approaching 100 degrees on Saturday across the Dakotas. The front as it arrives though will be a focus for at least scattered showers and thunderstorms. Some of the heaviest rainfall with the front should tend to focus over areas of eastern North Dakota and northern Minnesota and some localized flash flooding will be possible here. Elsewhere, a rather strong axis of mid to upper level ridging across the Desert Southwest will maintain hot and dry weather. In fact, some additional record high temperatures can be expected through Saturday and especially across southern California. Across the interior deserts of the Southwest, temperatures will locally range from 110 to 115 degrees. However, areas just to the east across the greater Four Corners area, and especially the southern Rockies, will see a westward advance of moisture in association with a developing monsoon pattern. This will promote scattered showers and thunderstorms through the afternoon and evening hours which will also help to keep temperatures across these areas relatively cooler. Orrison Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php