Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 335 PM EDT Tue Aug 01 2023 Valid 00Z Wed Aug 02 2023 - 00Z Fri Aug 04 2023 ...The heat goes on from the Southwest into the Southern Plains, Lower Mississippi Valley and central to western Gulf Coast... ...A fire weather threat continues across portions of Oklahoma into Texas... ...Heavy rains and flash flooding possible from the Mid Mississippi Valley into the Lower Ohio Valley... ...Active Monsoonal pattern to bring heavy rains and flash flooding threat from the Great Basin into the Northern to Central Rockies and Northern to Central High Plains... The closed mid to upper level high across the Southern Plains will continue to be the dominant weather feature across the country over the next few days. Little movement is expected to this feature, keeping the heat going from the Southwest, into the Southern Plains, Lower Mississippi Valley and central to western Gulf coast. Across these areas, triple digit high temperatures area likely over the next several days. When this is combined with high moisture content, dangerous, life-threatening heat indices are likely to continue across much of these areas. Currently excessive heat warnings and heat advisories stretch across much of these areas, with no immediate end in sight to these warnings and advisories. The hottest temperatures will continue across portions of the Southwest from southeast California into Southern Arizona. While Phoenix Arizona saw an end to the record streak of 110 degree F+ high temperatures on Sunday, a new streak will likely begin by mid-week and continue into the upcoming weekend. In addition to the very hot temperatures across the Southern Plains, an elevated to critical fire weather threat will continue over the next few days from western to central Oklahoma into west central Texas from the combination of low relative humidities and increasingly gusty winds. Wet weather is expected to remain active on the northwestern and northeastern peripheries of the nearly stationary mid to upper level high over the Southern Plains. Upper level disturbances riding along the northeastern edge of the upper high and in the vicinity of a stationary frontal boundary stretching from the Central Plains, southeastward into the Lower Mississippi Valley produced very heavy rainfall amounts across portions of central Missouri early Tuesday morning, with totals between 4 and 7 inches recorded. With no big changes to the overall pattern, additional very heavy rainfall amounts and an increasing flash flood threat is possible beginning Tuesday night and lasting into Wednesday morning over portions of south central Iowa into northeast Missouri. This heavy rain and flash flooding threat is then expected to sink farther southeast on Thursday into the Lower Ohio Valley and Tennessee Valley region. On the western side of the Southern Plains upper ridge, above average monsoonal moisture values combined with upper level disturbances rotating northeastward from the Southwest and across the Great Basin and Central to Northern Rockies will produce widespread showers and thunderstorms. Locally heavy rains and flash flooding are possible over the next two days from portions of the southern Great Basin, into the Central to Northern Rockies and in the lee of the Northern to Central Rockies. Oravec Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php