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  1. High CAPE moderate shear severe weather outbreak is becoming likely on Saturday from the southern Plains to the Ohio Valley, including our own Mid-South. While the southern Plains may get rocked, my focus will be in/near our subforum region and the Mid-South. Friday IL/IN may go in Illinois and Indiana as the Thursday night Plains MCS ejects up that way and leaves an outflow boundary warm front hybrid. Friday heights will be rising slightly, and the next short-wave may be back in Missouri, but IL/IN will have high CAPE on a boundary. Still I would at least watch Friday. Atmosphere sometimes give hints of over/under the day before. Saturday could be a severe weather outbreak all the way from Oklahoma to Ohio, including all points in between and slightly south. Sunday morning the Saturday reports chart may look like something from an April outbreak. This time we trade in strong wind shear for high CAPE. Speed shear will be plenty for supercells though. Low level shear will be quite impressive on the synoptic warm front and any outflow boundaries from Friday night rain in Hosier Alley. Mid-South: On Saturday morning I expect a warm front and/or outflow boundaries to be draped near the Ohio River. Low pressure should track out of Missouri into the region. Smaller meso-lows are possible along the Ohio River Valley boundary as it lifts north. Locally higher storm-relative-helicity will be found east of any lows and really all along the boundary. Low level jet, which has frustrated Plains chasers, will be pumping right into the Mid-South. Mid-upper level winds will be WSW, none of this VBV prone SSW stuff. Though speed shear is not exceptionally high, turning with height and CAPE will both be robust. Stout upper level wave will come out by 00Z 5/28 and spark severe thunderstorms ahead of itself Saturday afternoon. SPC has Enhanced Risk Day 3. Pretty easy to read between the lines that a Moderate Risk is coming, perhaps as early as Day 2. MDT would probably centered from eastern OK into the Ozarks, but may extend into our Mid-South. At any rate Saturday severe storms are likely and may include tornadoes.
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