Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 348 AM EDT Thu Sep 06 2018 Valid 12Z Thu Sep 06 2018 - 12Z Sat Sep 08 2018 ...Tropical Depression Gordon continues to bring heavy rain and flash flooding concerns to portions of the Southern and Central Plains and the Middle Mississippi Valley... ...Excessive heat continues to be felt across the northeastern U.S.... A frontal boundary is forecast to become stalled over portions of the Central/Southern Plains and Middle Mississippi Valley in the coming days. This boundary, coupled with the deep moisture influx from Tropical Depression Gordon, will be a focus for slow moving storms capable of producing high amounts of rainfall. Additional rainfall on top of already saturated soils with keep an elevated threat for flooding through the end of the week for parts of the central U.S. WPC has much of Arkansas in a Slight and Moderate Risk for excessive rainfall today, then expanding into Missouri and southern Illinois on Friday. The area of heavier rain is expected to shift to the east on Saturday, therefore the Slight and Moderate Risks extend into Indiana and parts of the Ohio Valley. A cold front will drop south through Canada and slow over the northern-tier states. Overnight lows along parts of the International border may be chilly in the mornings as surface high pressure slides into the region in the wake of the front. Showers and thunderstorms fire along this boundary, with the highest amounts likely setting up over Upper Michigan. Numerous areas within this region are already experiencing saturated soils and ongoing flooding, so any further rainfall will only exacerbate the situation. Ahead of this approaching cold front, a deep pull of warm and moist air is resulting in hot and humid conditions across much of the Eastern U.S. Heat advisories remain in effect for parts of the Northeast and coastal Mid-Atlantic today. Temperatures will moderate once the cold front tracks across this region by the end of the week. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php