Mesoscale Discussion 1917
NWS Storm Prediction Center Norman OK
0325 PM CDT Wed Oct 27 2021
Areas affected...southeast Louisiana into southern Mississippi
Concerning...Tornado Watch 542...
Valid 272025Z - 272200Z
The severe weather threat for Tornado Watch 542 continues.
SUMMARY...Threat for damaging wind and tornadoes including potential
for a couple of strong tornadoes will persist across southeast LA
and far southern MS into the early evening.
DISCUSSION...Warm front is moving northward and currently extends
from southeast LA near New Orleans northwest into southwest MS.
Numerous discrete showers and a few supercells continue developing
across southeast LA within the weakly capped warm sector along and
south of the warm front where the atmosphere remains moderately
unstable. The Slidell VWP indicates a large hodograph with veering
winds in the lowest 1 km supporting up to 350 m2/s2 storm relative
helicity along the low level jet corridor. Some of the pre-frontal
convection will likely evolve into mature supercells and become
capable of producing tornadoes, especially as they interact with the
warm front. Otherwise, embedded bowing segments, mesovortices and
occasional supercells continue to be observed within the squall
line, supporting a threat for damaging wind and QLCS tornadoes.
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