569
ACUS11 KWNS 262010
SWOMCD
SPC MCD 262010
SCZ000-GAZ000-FLZ000-262215-

Mesoscale Discussion 2119
NWS Storm Prediction Center Norman OK
0310 PM CDT Thu Sep 26 2024

Areas affected...portions of eastern Georgia and South Carolina.

Concerning...Tornado Watch 685...

Valid 262010Z - 262215Z

The severe weather threat for Tornado Watch 685 continues.

SUMMARY...Bands of low-topped storms will continue to move onshore
through the afternoon and evening. Low-level shear is supportive of
a tornado risk and will continue to increase tonight.

DISCUSSION...As of 20 UTC, outer rain bands associated with
Hurricane Helene were continuing to move onshore across parts of
eastern GA and SC. Low-level easterly flow is slowly increased
supporting continued inland advection of a very warm and moist
tropical air mass. Despite very poor mid-level lapse rates, weak to
moderate buoyancy continues to support numerous convective elements
moving onshore within these bands. Strong low-level shear (0-1km SRH
300-400 m2/s2) is in place and will continue to intensify this
afternoon and evening as Helene approaches shore. Low-topped
supercells will continue to pose a tornado risk as they move
onshore. The risk may be focused near a weak frontal zone where
low-level shear is enhanced further.

..Lyons.. 09/26/2024

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

ATTN...WFO...ILM...CHS...CAE...JAX...FFC...

LAT...LON   31718241 33378224 34138157 34428075 34498017 34287961
            33727910 33147903 32138023 30628138 30618162 31038208
            31718241