Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 340 AM EDT Fri Jul 27 2018 Valid 12Z Fri Jul 27 2018 - 12Z Sun Jul 29 2018 ...Severe thunderstorms possible across portions of the Mid-Atlantic and the Northeast on Friday... ...Flash flooding and severe weather possible for portions of the central Plains... ...Dangerous heat to continue across the Southwest and California through Saturday... After a brief break in the relentless rains across the Eastern U.S. the past few days, expect showers and thunderstorms to return on Friday ahead of an approaching cold front. With heat and humidity still in place across this region, developing storms may be capable of producing severe weather and the Storm Prediction Center has highlighted portions of the Mid-Atlantic and Northeast within a slight risk. Given the very wet antecedent conditions across this region, any kind of heavy rainfall would also raise the risk for flash flooding, and accordingly, WPC has placed this region within a slight risk on the day 1 excessive rainfall outlook graphic. In addition, the southern portion of this front will linger across the Southeast resulting in a daily chance for showers and storms into the weekend across the Carolinas, the Deep South, and Florida. Multiple disturbances in the upper levels will interact with a stationary frontal boundary from the central/southern Plains back into the central Rockies resulting in widespread showers and thunderstorms across the central Plains Friday into Saturday. With plenty of moisture and instability in place, storms will be capable of producing severe weather and heavy to excessive rainfall. The Storm Prediction Center has highlighted portions of the central High Plains within a slight to enhanced risk for severe weather. Large hail and damaging winds are the primary threats, but an isolated tornado or two cannot be ruled out either. WPC has also highlighted portions of this same region as well as into Oklahoma within a marginal to slight risk for excessive rainfall/flash flooding on Friday and Saturday. A dangerous heat wave will continue out west through Saturday underneath of a stubborn upper level ridge. Temperatures across portions of the Desert Southwest and central California are forecast to be in the triple digits, which is as much as 5 to 10 degrees above normal. Excessive heat warnings and heat advisories remain in effect across interior and southern California, far northwest Arizona, and southern Nevada. Because of the very hot and dry conditions, fire weather and poor air quality will also remain a concern across the western U.S.. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php