Event Summary for Central Alabama
On Tuesday, November 15th, moisture began streaming northward from the Gulf of Mexico. The moisture surge was just ahead of an approaching upper level low. Surface dew points climbed into the middle 60s and created increased atmospheric instability late Tuesday night. As the upper low approached, deep layer shear increased and led to increased storm relative helicities (SRH) in the lowest levels of the atmosphere. This set the stage for supercell development in Central Alabama. By 5 am Wednesday morning, dew points had increased into the upper 60s and 0-1km SRH of 300-400 m2/s2 across Sumter and Marengo Counties. By 7:45 am, one supercell dropped 2 tornadoes in these counties. Similar severe weather parameters advected across Central Alabama through the morning hours and caused additional supercell development near Montgomery, Auburn and Opelika.
The information below summarizes the tornadoes from this day:
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