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Severe Weather Thread 2026


goldsborosnow
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...Mid-Atlantic and Southeast...
   Primary changes this outlook are to add a 45 total severe
   probability along with minor northeast and southeast expansion to
   the categorical risk areas. Portions of the region, centered on SC
   to MD, may warrant an upgrade to a level 4/Moderate Risk in later
   outlooks.

   A large and deepening upper trough will eject east/northeastward out
   of the MS/OH/TN Valleys and across the Appalachians and into the Mid
   Atlantic/Northeast on Monday, with an expansive area of strong to
   intense wind fields aloft. A deep cyclone will move from Lower MI
   into QC, with an occluding cold front arcing southeast across the
   northern Appalachians, then south-southwest into the northern Gulf.
   This front will clear all but the FL Peninsula by Monday evening.

   Ahead of the front, seasonably rich low-level moisture characterized
   by 60s surface dew points will spread northward from the eastern
   Gulf/western Atlantic. Convection will likely be ongoing at 12Z
   Monday, low-topped along the Upper OH Valley to central Appalachian
   portion of the front to deep convection in the lee of the southern
   Appalachians to eastern FL Panhandle. A diurnal uptick in storm
   intensity, including potential for semi-discrete supercells ahead of
   the front, should occur from north FL to the Carolina Piedmont.
   Further intensification is anticipated midday into the afternoon as
   a confined corridor of moderate buoyancy likely develops just ahead
   of morning storms.

   Enlarged low-level hodograph curvature, in conjunction with
   favorable elongation of the mid/upper hodograph, should foster a mix
   of broken supercells south with line-embedded supercells in the
   reinvigorated QLCS north. With such intense 700-mb flow aptly timed
   with the diurnal heating cycle overlying rich low-level moisture,
   setup could yield an expansive severe weather day, including strong
   tornadoes and significant damaging winds. The degree of
   boundary-layer heating, as well as timing of convection that may
   outpace the front late D2 into early D3, will play key roles in how
   intense severe magnitudes may become. At present, the most likely
   corridor for significant/widespread severe appears centered on the
   eastern Piedmont to coastal plain from SC to MD around midday into
   the afternoon.
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