Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 358 AM EDT Sun Jul 22 2018 Valid 12Z Sun Jul 22 2018 - 12Z Tue Jul 24 2018 ...Heavy rain and flash flooding to continue across the Mid-Atlantic and Northeast... ...Severe weather and heavy rain will occur across the Plains and into the central/southern Rockies... ...Unsettled weather expected across the central and eastern Gulf of Mexico.... ...Dangerous heat to continue across the southern Plains and portions of the western U.S... Another day of heavy rainfall is expected from the Ohio and Tennessee Valleys into the Northeast. A frontal system will slowly push eastward and eventually stall today which will act as a focal point for showers and thunderstorms. A slight risk of flash flooding is possible for the Mid-Atlantic today where it received an impressive amount of rainfall on Saturday. By Monday, another round of showers and thunderstorms is expected especially from the western Carolinas to the Northeast. Once again, a slight risk of flash flooding will be possible for those regions. Heavy rainfall will also develop along the southern North Carolina coast on Monday; this activity could also yield to flash flooding. A frontal system will slide across the northern High Plains today--firing off convection along the boundary. Severe weather will be possible particularly from North Dakota southward into western Nebraska--where the Storm Prediction Center has issued a slight risk. By Monday, a plume of moisture will extend into the eastern High Plains of Colorado and New Mexico where flash flooding could occur along favorable terrain. Thunderstorms will also impact the Central Great Basin and along the Sierra Nevada mountain range. These regions could see isolated flash flooding from this convective activity. A frontal boundary will be draped across the Southeast for most of the short term period. Copious amounts of moisture from the Gulf of Mexico will aid in producing heavy rainfall and severe weather today--especially along the Florida Panhandle southward into the Tampa Bay region. A slight risk of severe weather will be possible along with a marginal risk of flash flooding. By Monday, the slight chance of severe weather will shift westward across southeast Louisiana. Dangerous heat remains in place across the southern Plains, lower Mississippi Valley, and much of the Southwest and western United States. This heat is expected to remain in place through Monday. Excessive heat watches, warnings and heat advisories are in place across these regions. High temperatures will reach well over the century mark across Texas and Oklahoma. The Pacific Northwest will also continue to experience above normal temperatures--especially by the end of the weekend where temperatures could reach the mid to upper 90s and even reach over 100 in some areas. By Tuesday, the Desert Southwest will see temperatures climb well above 110 degrees--with places like Phoenix, AZ possibly reaching to 117. Reinhart Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php