|Mesoscale Discussion 152|
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Mesoscale Discussion 0152
NWS Storm Prediction Center Norman OK
1018 PM CDT Mon Mar 19 2018
Areas affected...East central AL
Concerning...Tornado Watch 13...
Valid 200318Z - 200415Z
The severe weather threat for Tornado Watch 13 continues.
SUMMARY...Thunderstorm development may persist through about 05z
along an outflow boundary, thus justifying a local watch extension
beyond the scheduled 04z expiration.
DISCUSSION...Training convection continues to initiate along the
outflow boundary trailing westward from the lead supercells that
have now largely moved into GA. Per regional VWPs, low-level flow
has been slowly veering with time in AL, which should lead to a
reduction in storm formation across AL within the next 2-3 hours.
However, storm development will likely persist along the outflow
boundary until at about 05z, while any warm sector development along
the surface trough will become less probable after 04z. As such, a
local extension of tornado watch 13 in time is possible to reflect
the lingering large hail/damaging wind threat across a small part of
east central AL.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 33188534 33178580 33288607 33488610 33668604 33758581
33768543 33648533 33378532 33188534
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