Storm Damage Survey Summary - 13 July 2004

- Exeter area -

Investigators
David Sills, MSC King Radar
Kelly Hobelman, MSC Ontario Region

Severe Weather Type	Tornadoes
Location	Brinsley / Farquhar / Elimville
Time	1810 / 1810 EDT / 1825 EDT
Lat / Long	43.2280, -81.5375 (start) 43.2710, -81.4935 (end) 43.3610, -81.3875 (start) 43.3775, -81.3605 (end) 43.3435, -81.4080 (start) 43.3735, -81.3880 (end)
Magnitude	F1 / F0 / F0
Path Length	6.0 km / 2.8 km / 3.7 km
Direction of Motion	215º / 230º / 205º
Max. Path Width	10 m / 10 m / 10 m
Significant Damage	Barn roof removed and thrown to NE, drive shed damaged with debris to NE, grain trailer moved short distance, wood missiles through boards / metal siding, tree branches down, minor crop damage Minor crop damage Part of barn roof thrown to S side of barn, some debris to N side, minor crop damage
Damage Estimate (Source)	$30 000 total (Sills)
Notes	Photo / video evidence for each tornado Thunderstorms developed rapidly as the Lake Erie lake breeze front collided with the Lake Huron lake breeze front. The thunderstorms then moved east with the upper flow but the updrafts remained rooted in the boundary collision zone that was continuing to move west. Tornadoes developed as the thunderstorms underwent rapid growth and moved NE along the boundary collision zone. Witnesses described no close lightning or rain but distant thunder as the tornadoes occurred.