Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 335 PM EDT Tue Jun 23 2015 Valid 00Z Wed Jun 24 2015 - 00Z Fri Jun 26 2015 ...Severe thunderstorms possible across the Northeast/Mid-Atlantic this evening, the northern Plains to the Midwest tomorrow, and northern High Plains Thursday... ...Heavy rain with flash flood potential is possible across portions of the Middle Mississippi to Ohio Valley Wednesday into Thursday... A cold front moving quickly eastward this afternoon will continue to allow for the development of showers and thunderstorms ahead of it across the Northeast and Mid-Atlantic states tonight. Some storms may be capable of heavy rainfall, flash flooding, and/or severe weather but should mostly come to an end by early Wednesday as the front moves offshore and higher pressure moves in behind. The western and more stationary portion of this boundary currently draped across the central Plains will begin moving north as a warm front as an area of low pressure develops along the boundary tonight. Showers and thunderstorms are expected to develop along and north of the boundary across the northern/central Plains and into the Midwestern states over the next few days. Severe weather is possible with these storms, as well as farther back into the northern High Plains on Thursday as weak energy moves through in the flow aloft. In addition to the severe weather threat, heavy rainfall capable of producing flash flooding may also be possible, especially across parts of the Middle Mississippi Valley into the upper Ohio Valley on Wednesday and into Thursday. Elsewhere, a weak cold front dropping in from central Canada will allow mainly scattered showers and thunderstorms across portions of the northern Mississippi Valley and Upper Great Lakes on Wednesday. At the same time, mainly diurnally driven scattered showers and thunderstorms remain in the forecast for portions of the Southeast coast. Some more organized storms with moderate to heavy rainfall may develop across central Florida during the daytime hours, and scattered storms may reach back along the Gulf Coast as clockwise flow around an area of high pressure in the Gulf brings southerly flow and weak moisture into the area. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php