|Mesoscale Discussion 1701|
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Mesoscale Discussion 1701
NWS Storm Prediction Center Norman OK
0133 PM CDT Thu Sep 17 2020
Areas affected...Parts of northeastern South Carolina into southern
Concerning...Tornado Watch 492...
Valid 171833Z - 172030Z
The severe weather threat for Tornado Watch 492 continues.
SUMMARY...Vigorous thunderstorms overspreading the northeastern
South Carolina into southern North Carolina coastal plain will
continue to pose a risk for tornadoes into early evening. This
includes the Florence SC area by 3-4 PM EDT, and at least some risk
for a strong tornado. A new tornado watch probably will be needed
across parts of southern/eastern North Carolina within the next
couple of hours.
DISCUSSION...The remnant mid-level cyclonic vorticity center from
Sally continues to migrate northeastward across the Carolina
Piedmont. Strongest convection has largely been focused near the
intersection of the associated trailing mid/lower tropospheric wind
shift and a warm frontal zone across the coastal plain. This is now
shifting east of the Sumter SC area and may increasingly impact
areas near and south of Florence (where stronger 2-hourly surface
pressure falls are now focused) through 19-20Z, before continuing
into the coastal plain of southern North Carolina thereafter.
Low-level shear remains maximized along the warm frontal zone near
and just ahead of the vigorous convective cluster, near the nose of
a 30-40 kt southerly 850 jet. Although boundary-layer
destabilization is still being inhibited, at least to some extent,
along the warm frontal zone, embedded supercells with occasionally
intensifying low-level mesocyclones will continue to pose a risk for
the production of tornadoes into early evening.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 34558001 35297836 35307762 34597779 33717939 33628025
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