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We have been forecasting it for the last couple of days and now it's finally here, a low pressure system that could potentially bring another round of severe weather across central portions of the forecast area with all modes of severe weather possible. That includes the possibility for an isolated tornado or two as this event starts and then it'll turn more into a wind and hail event as a line of storms moves east through the overnight hours/early morning hours on Wednesday. Once this low pressure system exits the forecast area, we'll see more quiet skies going into the start of the weekend.
The low pressure system is moving east/northeastward and as it does, its warm front is going to lift northwards throughout the day. As it does, winds are going to pick up out of the south with sustained winds anywhere from 5 to 25 miles per hour with gust upwards of 35/40 miles per hour. Those southerly winds are bringing up an unstable airmass which will help feed the potential for severe thunderstorms into the late afternoon. The storms are going to fire along the cold/occluded front as this low pressure system pushes eastward and will possibly bring all modes of severe weather to central parts of the Sioux Empire.
The timing for these storms to start between 4-7pm and will move eastward throughout the overnight hours; as the storms initially begin to develop, there will be the threat for an isolated tornado or two and then the threat will shift to more wind and hail. There is an area that includes cities like Pierre, Chamberlain, Winner, Valentine, Lake Andes... that are in a hatched risk area which means that they have a better chance of seeing severe weather this late afternoon/evening into the overnight hours.
Temperatures today will climb into the 70s, 80s and 90s across the Sioux Empire with the warmest temperatures found across the Missouri River. Winds are going to be breezy out of the south and those located across the MRV could see showers and thunderstorms developing this afternoon ahead of the main line of storms expected later this evening.
Temperatures are going to cool down into the mid/upper 70s as we go into the start of the weekend. Skies are going to be clear as well going into Friday and Saturday before Sunday, when we see another round of showers/storms which will continue into the start of next week. However, an early look at the Fourth of July calls for mostly clear skies... however, because it's an early look that could change so we'll keep you updated.