SPC AC 132154

   Day 3 Convective Outlook AMEND 1
   NWS Storm Prediction Center Norman OK
   0454 PM CDT Sun Sep 13 2020

   Valid 151200Z - 161200Z

   ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
   THE CENTRAL GULF COAST...

   AMENDED FOR INCLUSION OF MARGINAL SEVERE PROBABILITIES ACROSS PARTS
   OF THE CENTRAL GULF COAST

   ...SUMMARY...
   Isolated tornadoes may occur Tuesday across portions of the central
   Gulf Coast in association with Tropical Cyclone Sally.

   ...Central Gulf Coast...
   Although some uncertainties remain regarding the track of Sally on
   Tuesday, there is general agreement in recent model guidance for a
   slow northward motion across coastal southeastern LA and southern MS
   through the period. Reference latest NHC advisories for more
   information on Sally's forecast track and intensity. Even though the
   overall cyclone's northerly motion is expected to remain rather
   modest Tuesday, 35-50+ kt of low-level south-southeasterly flow
   associated with the eastern half of Sally's circulation will likely
   overspread parts of coastal southeastern LA, southern MS/AL, and the
   FL Panhandle through the period. Forecast soundings from various
   models show sufficiently veering/strengthening winds in the boundary
   layer to support low-level rotation. Isolated tornadoes appear
   possible across these areas through Tuesday and Tuesday night,
   especially with any outer rain bands on the eastern periphery of the
   cyclone.

   ..Gleason/Grams.. 09/13/2020

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   NOTE: THE NEXT DAY 3 OUTLOOK IS SCHEDULED BY 0730Z