|Mesoscale Discussion 147|
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Mesoscale Discussion 0147
NWS Storm Prediction Center Norman OK
0506 PM CDT Mon Mar 19 2018
Areas affected...Northern AL
Concerning...Tornado Watch 13...
Valid 192206Z - 200000Z
The severe weather threat for Tornado Watch 13 continues.
SUMMARY...Greatest tornado threat will be focused along warm front
in northern AL through about 00z. Significant tornadoes will be
DISCUSSION...Supercells are intensifying along a surface trough
across northeast MS, and these storms will spread across northern AL
through the late afternoon/evening. The southwest-northeast
orientation of the initiating surface trough has supported some
storm interactions. However, even with a supercell cluster mode,
the ongoing storms will move into a more favorable environment for
tornadoes with time in AL. Low-level shear will be strongest near
and north of the warm front, which also denotes the northeast edge
of the most unstable portions of the warm sector (MLCAPE at or above
2000 J/kg). This corridor along the warm front will provide the
most favorable environment for significant tornadoes for the next
few hours as the supercells mature and begin to move
east-southeastward along the boundary.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 34718786 34668739 34518669 34318649 34058646 33898677
34048733 34118790 34298814 34668813 34718786
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