BBS: TELESC.NET.BR Assunto: DAY1SVR: Day 1 Convective Outlook De: COD Weather Processor Data: Sun, 22 Mar 2026 05:59:24 +0000 ----------------------------------------------------------- ACUS01 KWNS 220559 SWODY1 SPC AC 220557 Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1257 AM CDT Sun Mar 22 2026 Valid 221200Z - 231200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM THE OHIO VALLEY INTO THE NORTHERN MID ATLANTIC... ...SUMMARY... Scattered strong to severe thunderstorms with large hail, damaging wind gusts, and a conditional tornado threat are expected this afternoon and evening across parts of the Ohio Valley into the northern Mid Atlantic region. ... Overview ... A weak shortwave trough will gradually amplify today as fast west-northwesterly flow translates across the Great Lakes into the Northeast. At the surface, a cold front will push southward through the Ohio Valley, with a series of weak frontal waves moving eastward into the Mid-Atlantic. ... Ohio Valley into parts of the Mid-Atlantic ... Favorable deep-layer shear will be in place across the area as relatively steep midlevel lapse rates advect into the region, originating within an unseasonably hot and well-mixed airmass across the Southwest and central US. The key uncertainty regarding severe potential will be how aggressively moisture returns. Strong antecedent heating and mixing upstream may limit moistening across the Ohio Valley and northern Mid-Atlantic, but relatively cool midlevel temperatures should still support moderate buoyancy. Storms are expected to initiate along and ahead of the surface front across eastern Ohio and Pennsylvania, where modest warm advection and a weakening cap favor development. Moderate instability combined with the favorable wind profile will support a supercell threat. Large hail -- potentially greater than golf balls -- will be possible with any sustained supercell. Damaging winds are also possible, particularly where surface heating is maximized and steep low-level lapse rates can develop. With time, the surging cold front should undercut thunderstorms, limiting the potential for a more organized, widespread damaging wind event. The low-level wind field will support some tornado potential before thunderstorms are undercut, with the tornado threat tied closely to how aggressively the boundary layer moisture returns. An additional round of convection is expected to develop during the late afternoon into the overnight hours as the front surges south-southeastward. This activity is likely to be post-frontal and elevated in nature, but given strong cloud-layer shear and steep mid-level lapse rates, severe hail will still be possible with these later storms. ..Marsh.. 03/22/2026 $$ = = = To unsubscribe from WX-STORM and you already have a login, go to https://lists.illinois.edu and use the "Unsubscribe" link. Otherwise email Chris Novy at cnovy@cox.net and ask to be removed from WX-STORM. --- SBBSecho 3.28-Linux * Origin: Capitol City Online (1:2320/107) ----------------------------------------------------------- [Voltar]