Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 AM EDT Fri May 06 2022 Valid 12Z Fri May 06 2022 - 12Z Sun May 08 2022 ...A low pressure system will bring a threat of severe thunderstorms into the Southeast and Mid-Atlantic today while heavy rain and flash flood threat overspreads the central Appalachians and northern Mid-Atlantic into tonight... ...Colder and unsettled weather across the Northwest and northern Great Basin... ...A heat wave is forecast to develop and intensify over the southern Plains into the weekend... A low pressure system currently located across the central U.S. will continue to spread inclement weather eastward through the eastern U.S. for the next couple of days. Clusters of strong to severe thunderstorms early this morning across the Deep South are expected to redevelop over the interior Southeast and the Mid-Atlantic later today ahead of an approaching cold front. Farther north, heavy rain will have the potential to develop and linger just north of a slow-moving warm front from across the central Appalachians and into the northern Mid-Atlantic into tonight as the center of the low pressure system passes to the south. Rainfall totals up to 3 inches are possible and could create scattered flooding concerns in these areas. By Saturday, the low pressure system will begin to slide off the Mid-Atlantic coast as the weather pattern across the U.S. is forecast to slow down. This will lead to a very dreary weather pattern to develop and linger across parts of the Northeast and down into the Mid-Atlantic through the weekend. Although the rain is forecast to gradually taper off across the interior sections, much of the Eastern Seaboard will be under the influence of overcast skies, gusty northeasterly winds, and occasional rain with high temperatures only reaching into the 50s. Minor coastal flooding is also possible as gusty onshore flow strengthens along the New Jersey and Delmarva coastline later in the weekend. Elsewhere, a deepening upper-level trough and embedded shortwaves entering the Northwest will bring colder air and unsettled weather into the northern Great Basin/northern Rockies. Heavy snow is possible across the Cascades and mountainous terrain of Idaho and southwest Montana, where over 6 inches of snow is likely. Moderate to locally heavy rainfall is possible along coastal sections of the Northwest. High winds may also lead to dangerous travel for high profile vehicles over the northern High Plains on Friday as the aforementioned system ejects out of the northern Rockies. High Wind Watches have been issued across north-central Montana. Gusty winds may also be experienced across parts of the central Great Basin and central/northern Sierra Nevada through Saturday morning. As the previously mentioned upper-level trough deepens over the West Coast, a downstream ridge will build over the central U.S. and lead to summer-like heat over parts of the southern Plains beginning today and then intensifies over the weekend. On Saturday in particular, highs will soar into the upper 90s and triple digits throughout the southern High Plains and much of Texas. Heat indices will approach 110 degrees across South Texas. This early-season heat will potentially break several daily high temperature records and could be dangerous for residents if proper heat safety is not followed. Overnight temperatures will offer some relief as lows dip into the 70s. Kong/Snell Graphics are available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php