Mesoscale Discussion 1456
   NWS Storm Prediction Center Norman OK
   0515 AM CDT Sat Sep 15 2018

   Areas affected...Eastern NC

   Concerning...Tornado Watch 375...

   Valid 151015Z - 151145Z

   The severe weather threat for Tornado Watch 375 continues.

   SUMMARY...Transient rotation has been noted within several cells
   during the past few hours. Tornado potential will extend pass the
   expiration of Tornado Watch 375 and another watch will likely be
   needed.

   DISCUSSION...Recent KRAX radar imagery depicted a near 30 kt
   rotational velocity within a cell moving through Wayne County. Radar
   data from KMHX has also sampled transient rotation within the rain
   band extending offshore. The band has shown consistent development
   of a line echo wave patterns as more intense portions of the band
   approach the coast. Thermodynamic environment across much of the
   region has remain relatively unchanged during the past several
   hours, although there are now some indications (i.e. location of the
   76 deg F isodrosotherm) that higher theta-e air has pushed a bit
   further inland. Even so, the most unstable air remains over the
   water and the immediate coastal areas.

   Given the very slow motion of the system, the trends observed during
   the past few hours are expected to persist into the morning. There
   is some potential for greater instability to develop within any
   cloud breaks after sunrise. However, the expansive cloud shield
   associated with Florence suggests this possibility is uncertain.
   Nevertheless, the potential for brief tornadoes is expected to
   continue past the expiration time of Tornado Watch 375 and another
   Tornado Watch will likely be needed.

   ..Mosier/Edwards.. 09/15/2018

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

   ATTN...WFO...MHX...RAH...ILM...

   LAT...LON   35407911 35767838 35757707 35237609 34507602 33477670
               33807847 34577929 35407911