Lone Tree Tornado - 04/13/14

Overview: A semi-isolated storm on the southern end of a larger thunderstorm complex produced a brief tornado.

Rating:                 EF-0
Estimated peak wind:    65 mph
Path length /statute/: 1 mile
Path width /maximum/:   25 yards
Fatalities:            0
Injuries:               0

Start date:             April 13, 2014
Start time:             5:56 pm CDT
Start location:       0.5 miles west of Lone Tree, IA    
Start lat/lon:          41.4880 / -91.4437

End date:               April 13, 2014
End time:               5:58 pm CDT
End location:         0.5 miles north of Lone Tree, IA
End lat/lon:            41.5039 / -91.4301


Radar Reflectivity
Radar reflectivity image of storm that produced a tornado near Lone Tree

Radar Velocity
radar velocity image of storm that produced a tornado near Lone Tree


Survey summary: A team from the National Weather Service Quad Cities Forecast Office surveyed the area around Lone Tree late this morning. No damage was found. The tornado path information is estimated from witnesses and radar. Several witnesses described a funnel that went up and down numerous times. Photo and video documentation show that a tornado did touch down at least briefly to the west and northwest of town.

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



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