EF0 tornado in Franklin County, Illinois
Tornado May 8, 2009 · Franklin County, Illinois
The path drawn at its surveyed width of 40 yards (0.02 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.
What the National Weather Service wrote
This brief tornado was photographed by emergency management personnel. Leaves were observed in the rotation. No damage was located.
The wider storm
A mature, very intense derecho moved rapidly east along a stationary front across the Mid Mississippi Valley into the Lower Ohio Valley. With a very moist and unstable atmosphere, along with strongly veering winds aloft, embedded tornadic supercells were associated with the derecho. Widespread damaging winds were the primary impact. Nearly all the damage in southern Illinois was associated with the comma head at the northern end of the bow echo. Winds were measured slightly over 100 mph under the comma head as it passed through the Carbondale area. In addition to damaging winds, the slow-moving storm complex dumped very heavy rain that flooded roads.
Began near Royalton (37.8917, -89.1200).
Other tornadoes from the same storm system
4 more tornadoes the National Weather Service filed under this storm episode.
Source: NOAA Storm Events Database, event 164157. Narratives are written by the National Weather Service forecast office that issued the report.
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