At least three fatalities were reported in the small town of Rosalie in the northeastern-most counties in Alabama as a strong tornado swept through around midnight on November 30th, 2016. Multiple injuries and destroyed houses and buildings, including a day care center and church, were reported through the Sand Mountain region along the county line of Jackson and DeKalb Counties, Alabama.
This region, while typically less frequented by tornadic weather than much of the rest of the State of Alabama, contains terrain (the southern end of the Appalachian Mountains) oriented from southwest to northeast - which can act as a severe storm funnel due to the general path and heading that these storms take.
Additionally, I added a video loop of this severe storm, with four windows (like the images above) showing four radar products simultaneously.
Top Left: Base Reflectivity (shows precipitation)
Top Right: Storm Relative Velocity (shows rotation and motion of storm)
Bottom Left: Correlation Coefficient (compares radar returns with other radar returns)
Bottom Right: Differential Reflectivity (used to determine shape/size characteristics of radar returns).
At this point, it appears as if the National Weather Service was a bit ate to issue a Tornado Warning (purple box on the radar screen) for this storm...perhaps not until a tornado had dropped in Rosalie based on time stamps of storm reports and weather warnings. A Tornado Watch and Severe Thunderstorm Warning were in effect, however.
- Meteorologist Dan Schreiber
Dan Schreiber is an operational meteorologist, with experience