Mesoscale Discussion 1878
   NWS Storm Prediction Center Norman OK
   0345 PM CST Thu Dec 24 2020

   Areas affected...Northeast NC and southeast VA

   Concerning...Tornado Watch 518...

   Valid 242145Z - 242245Z

   The severe weather threat for Tornado Watch 518 continues.

   SUMMARY...The threat for a tornado or two may spread northeast of WW
   518 across a portion of northeast NC into southeast VA this evening.
   An additional tornado watch issuance is possible.

   DISCUSSION...Low-topped convection across northeast NC has struggled
   to maintain more persistent supercell structures within the northern
   gradient of surface-based instability. Surface dew points have
   increased into the low 60s, but may need to increase into the mid
   60s before a more sustained supercell tornado risk can be maintained
   farther north. Nevertheless, rather enlarged low-level hodographs
   support a conditional risk for a supercell or two to intensify and
   produce a tornado as this activity spreads northeast into southeast
   VA this evening.

   ..Grams/Guyer.. 12/24/2020

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

   ATTN...WFO...AKQ...MHX...RAH...

   LAT...LON   36157759 36877724 37297711 37427669 37357628 36877592
               36537584 36267594 35867642 35617706 35527765 35697787
               36157759