Public Information Statement
Issued by NWS Birmingham, AL

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NOUS44 KBMX 202002

Public Information Statement
National Weather Service Birmingham AL
202 PM CST Fri Jan 20 2017

...Brief spin-up tornado on the shores of Logan Martin Lake...

.Treasure Island Tornado...

Rating:                 EF-1
Estimated Peak Wind:    90 mph
Path Length (Statute):  0.7 miles
Path Width (Maximum):   175 yards
Fatalities:             0
Injuries:               0

Start Date:             Jan 19 2017
Start Time:             558 pm CST
Start Location:         2 ENE Coosa Island
Start Lat/Lon:          33.4785 / -86.3045

End Date:               Jan 19 2017
End Time:               600 pm CST
End Location:           5 SSW Pell City
End Lat/Lon:            33.4877 / -86.3025

Survey Summary:

A persistent mesocyclone spun up a brief weak tornado within a
line of thunderstorms as it passed through St Clair County.  The
tornado touched down on Logan Martin Lake just south of the
eastern shore of Treasure Island.  The tornado tracked northward
parallel to and just off the shores of the island, with the initial
damage pointing largely offshore.  Four boathouses were destroyed
and a few trees were snapped or uprooted here, but the path of the
tornado was far enough offshore so as not to cause any structural
damage to the homes another 50 to 100 feet further inland.  As the
tornado continued northward across a large cove, it remained
completely over water. As it approached the northeastern tip of
the island, which jutted out into the lake, the tornado came ashore
again and peeled metal roofing off a well-built boathouse.  The
tornado reached maximum strength here, with 10 large hardwood trees
uprooted in a concentrated area in a convergent pattern.  The
tornado passed offshore again and dissipated before reaching the
opposite point on the lake.

EF Scale: The Enhanced Fujita Scale classifies
tornadoes into the following categories.

EF0...Weak......65 to 85 mph
EF1...Weak......86 to 110 mph
EF2...Strong....111 to 135 mph
EF3...Strong....136 to 165 mph
EF4...Violent...166 to 200 mph
EF5...Violent...>200 mph

The information in this statement is preliminary and subject to
change pending final review of the event and publication in NWS
Storm Data.


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