Mesoscale Discussion 1689
   NWS Storm Prediction Center Norman OK
   0617 AM CDT Tue Sep 15 2020

   Areas affected...Southern Alabama...Florida Panhandle

   Concerning...Severe potential...Watch likely 

   Valid 151117Z - 151345Z

   Probability of Watch Issuance...95 percent

   SUMMARY...The tornado threat will increase along the immediate coast
   of Alabama and Florida this morning as Hurricane Sally approaches. A
   tornado watch will likely be needed within the next hour.

   DISCUSSION...The center of Hurricane Sally is currently located
   about 100 statute miles to the south of Mobile, Alabama. Heavy bands
   of rainfall surround the eye of Sally with the most notable band
   located from near Gulf Shores, Alabama extending southeastward into
   the northeastern Gulf of Mexico. Within this band, multiple
   semi-discrete thunderstorms are ongoing and some appear to be
   supercells. These storms will approach the coasts of Alabama and the
   Florida Panhandle over the next couple of hours. The WSR-88D VWP at
   Tallahassee and Eglin Air Force Base currently have a wind profile
   that shows veering winds with height in the lowest 3 km AGL. This is
   resulting in a 0-1 km shear near 20 kt. As Hurricane Sally
   approaches, low-level shear will steadily increase. As a result, a
   tornado threat will develop along the immediate coast. Further
   inland, instability is less which will keep the greatest tornado
   threat confined to the coastal areas for several hours.

   ..Broyles/Edwards.. 09/15/2020

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...TAE...MOB...LIX...

   LAT...LON   31458663 31108563 30668495 30108446 29708439 29508461
               29488507 29818560 30098616 30298699 30318804 30498831
               30718841 31118828 31348798 31448748 31458663