Tornado confirmed in Lee County on Monday

whirleyThe National Weather Service sent a survey team to assess the damage across Lee County from the derecho that moved from Iowa into Indiana.

They conclude that a tornado was on the ground for 4 miles with a width of 100 yards. From the National Weather Service:

THIS PATH WAS MAINLY OVER FARM FIELDS BUT DID TAKE DOWN NUMEROUS 
UTILITY POLES...INCLUDING A FEW THAT WERE BENT SHARPLY TO THE 
SOUTH...OPPOSITE OF THE STORM MOTION WHICH WAS NORTHEAST. THESE 
ALIGNED WITH THE NORTH PART OF THE DAMAGE SWATH. ONE WEAKLY 
CONSTRUCTED BARN WAS DESTROYED NEAR THE END OF THIS PATH. DAMAGE TO 
THE CORN CANOPY AT CROSSROADS ALONG THIS PATH REVEALED A MORE 
CONVERGENT SIGNATURE INDICATIVE OF A SHORT-LIVED TORNADO.

However, we posted photos last night of significant damage to homes and a grain elevator in Walton, Illinois. It was determined this was caused by straight-line wind near 100 mph!

THROUGHOUT THIS SWATH INDICATIONS WERE THAT WIND GUSTS WERE IN 
EXCESS OF 60 MPH WITH MULTIPLE  LOCATIONS OBSERVING SPEEDS IN EXCESS 
OF 80 MPH. AT TIMES DAMAGE WAS SOMEWHAT SPORADIC AND IN ZIG-ZAG TYPE 
ORIENTATION...BUT OVERALL THIS WAS A SEMI-CONTINUOUS CORRIDOR ABOUT 
ONE TO ONE AND A HALF MILES IN WIDTH. DEBRIS AND FALLEN TREE 
PLACEMENT TO THE NORTHEAST...ALL CORN FLATTENING OR BENDING TO THE 
NORTHEAST...AND MOST EYE-WITNESS REPORTS INDICATE THIS WAS FROM 
STRAIGHT-LINE WINDS. 

NEAR THE BEGINNING OF THIS ENHANCED WIND AREA...A LARGE OUTBUILDING 
WHICH WAS BOLTED TO ITS FOUNDATION WAS DESTROYED WITH SEVERAL LARGE 
PIECES BEING LIFTED AND THROWN DOWNSTREAM. ONE PART OF THE BARN WALL 
WAS LIFTED UP AND TOOK A PIECE OF THE FOUNDATION WITH IT. SLIGHTLY 
DOWNSTREAM A LARGE TREE WAS SNAPPED NEAR ITS BASE AT A PROPERTY WITH 
THE TREE FALLING ON THE FRONT PORTION OF THE HOUSE. IN WALTON...FOUR 
LARGE GRAIN STORAGE BINS WERE DESTROYED ALONG WITH A METAL 
OUTBUILDING. THE DEBRIS FROM THIS WAS FLUNG DOWNSTREAM...INCLUDING A 
FEW PIECES BEING IMPALED IN THE REMAINING STANDING PART OF THE 
ELEVATOR WHICH WAS ON THE EAST MOST SIDE OF THE PROPERTY. TWO OF 
THE BINS WERE BASICALLY FOLDED IN ON EACH OTHER. NEAR THE END OF 
THIS SWATH...THERE WERE A HANDFUL OF LARGE TREES SNAPPED WITH 
NUMEROUS UPROOTED.

ADDITIONAL INFORMATION ON THE WIND DAMAGE IN THIS AREA WILL BE 
PROVIDED AS IT BECOMES AVAILABLE.

THE NATIONAL WEATHER SERVICE WOULD LIKE TO THANK LEE COUNTY 
EMERGENCY MANAGEMENT...AMBOY ESDA...AND ROCKFORD MEDIA PARTNERS WHO 
ASSISTED WITH PHOTOS AND DETAILED REPORTS OF THE DAMAGE IN ADVANCE.
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Posted under tornado

This post was written by qni_it on June 25, 2013

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