Mesoscale Discussion 1589
   NWS Storm Prediction Center Norman OK
   0141 AM CDT Thu Aug 27 2020

   Areas affected...portions of southern LA

   Concerning...Tornado Watch 453...

   Valid 270641Z - 270945Z

   The severe weather threat for Tornado Watch 453 continues.

   SUMMARY...A threat for tornadoes will continue with embedded
   supercells in  bands associated with Hurricane Laura. Individual
   cells will track northwestward around 50 kt, as the system as a
   whole shifts northward around 13 kt.

   DISCUSSION...Two notable bands wrapping around the eastern periphery
   of Hurricane Laura continue to show multiple embedded supercells
   with low level rotation in region radar velocity data. Individual
   cells will track northwest around 50 kt. As a whole, Hurricane Laura
   is slowly shifting northward around 13 kt per official National
   Hurricane Center guidance. As a result, these outer bands will shift
   gradually northward across south-central into central LA through the
   early morning hours. Conditions will remain favorable for rapid
   tornado development with any embedded supercell given the deep,
   moist boundary layer and extreme vertical shear/low-level SRH.

   ..Leitman.. 08/27/2020

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

   ATTN...WFO...LCH...

   LAT...LON   30159293 30369308 30709307 30859300 30989291 31049255
               30889214 30459174 29519131 29149141 29099191 29179239
               29629258 30159293