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June 5th-September 1st, 2023 | Severe Storm Sequence


Iceresistance

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Damn, we're in the enhanced risk here.  Looks like I may be heading home early.  There is a small line approaching from the NW - wonder if that will stabilize the atmosphere enough to knock down the severe threat.  

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SPC Enhanced Risk area stayed the same at mid-day update for hail and wind, but they upgraded the tornado threat (5% now for NW Ohio and SE Lower Michigan). 

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Edited by NWsnowhio
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New watch coming soon...

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Mesoscale Discussion 1643 NWS Storm Prediction Center Norman OK 0115 PM CDT Thu Jul 20 2023

Areas affected...Extreme east-central IL into central/northern IN/OH...far southern MI...northwest PA...western NY

Concerning...Severe potential...Watch likely Valid 201815Z - 201945Z Probability of Watch Issuance...95 percent

SUMMARY...The threat for severe thunderstorms will increase with time this afternoon. One or more additional watches will likely be needed soon.

DISCUSSION...At 18 UTC, cumulus is increasing along a cold front from southwest lower MI into northwest IN, and also along a prefrontal trough from extreme east-central IL into western IN. As a well-defined midlevel shortwave trough moves across MI, confidence is high in additional storm development along the cold front this afternoon, with more scattered development possible near the prefrontal trough. Diurnal heating of an increasingly moist environment has resulted in MLCAPE increasing above 2000 J/kg across much of the prefrontal environment, with moderate midlevel flow supporting 40+ of effective shear, sufficient for organized clusters and a few supercells. Favorable buoyancy and relatively steep midlevel lapse rates will support a hail threat with the initial more discrete development. A tornado or two also cannot be ruled out with any sustained supercell. With time, one or more upscale growing clusters may evolve, with an increasing threat of damaging gusts. Farther east, an isolated storm that produced 1-inch hail around Erie, PA, near the lake breeze and along the leading edge of returning low-level moisture. In the short term, an additional strong storm or two may develop within this regime, with threat of isolated hail and strong/damaging gusts. Storms associated with the cold front (described above) will eventually move into this area by late afternoon or evening. Given the threats described above, one or more watches will likely be needed soon.

..Dean/Hart.. 07/20/2023

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