Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 332 AM EDT Sat May 05 2018 Valid 12Z Sat May 05 2018 - 12Z Mon May 07 2018 ...Locally heavy rainfall possible across the Tennessee Valley and the central Appalachians... ...Triple digit heat likely for portions of the Desert Southwest... Expect showers and thunderstorms to continue developing along a frontal boundary today from the Lower Mississippi Valley into the Mid-Atlantic region. Locally heavy rainfall will be possible near and to the north of an area of low pressure as it tracks across the Tennessee Valley, the central Appalachians, and into the western Mid-Atlantic states. To the south, an upper level low lingering over the Caribbean should keep showers and thunderstorms in the forecast across Florida as well today. Another frontal boundary dropping southward through the Midwest, the Ohio Valley, and the Northeast should bring mainly light to moderate rain and storms to these regions through the weekend. Meanwhile out west, a weak system moving through the Northwest and into the northern Rockies should increase chances for rain and storms on both Saturday and Sunday. Most of the precipitation should be light and scattered in nature, but locally heavier amounts along some of the favorable terrain may be possible. Temperature wise...the East should return back to near normal following the passage of a cold front while across the remainder of the nation, temperatures will be warm with some places nearing 10 to 20 degrees above normal across the central states and the West. In the Desert Southwest, triple digit afternoon highs are likely this weekend with excessive heat warnings in effect for some places on Sunday. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php