Severe Weather Outbreak Through Thursday

After a brief respite, a dangerous severe weather outbreak is poised to strike parts of the Great Lakes, Ohio Valley and East through Wednesday and Thursday.

Wed./Wed. Night

Wednesday, severe thunderstorms will ignite along a strong warm front and low pressure system from eastern Iowa, northern/central Illinois and southern Wisconsin into Indiana, southern Lower Michigan and Ohio.  This could affect the Wednesday afternoon/evening commute in ChicagoMilwaukeeDetroit and possibly Cleveland.  Damaging winds, large hail, some tornadoes, and local flash flooding from brief heavy rainfall are all threats.

Wednesday night, a cluster of severe thunderstorms, possibly in the form of a squall line with damaging straight-line winds, will sweep through this region as far east as western Pennsylvania and northern West Virginia.  Cities in this late threat include Pittsburgh, CincinnatiColumbus, Ohio.

It’s possible, though by no means certain, that thunderstorms Wednesday night could congeal into a long-lived squall line called a “derecho” with a more widespread damaging wind threat in this region.

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