National Weather Service Raw Text Product

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NOUS43 KLOT 030003
PNSLOT
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
031215-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
703 PM CDT MON SEP 2 2013 /803 PM EDT MON SEP 2 2013/

...BRIEF EF-0 TORNADO OCCURRED IN NORTHEAST LASALLE COUNTY ON SEPT
1ST..

WHILE A NATIONAL WEATHER SERVICE STORM SURVEY DID NOT LOCATE ANY
DAMAGE IN NORTHEAST LASALLE COUNTY FROM SUNDAY EVENING
STORMS...DETAILED REPORTS FROM STORM SPOTTERS AND PUBLIC
ACCOUNTS COMBINED WITH PHOTOS AND VIDEOS INDICATE THAT A BRIEF
TORNADO LIKELY OCCURRED. ACCOUNTS OF THE NEAR GROUND CONDENSATION
FUNNEL WERE USED FOR THE ESTIMATED PATH. ALMOST HALF OF THE TRACK
OF THE VISIBLE FUNNEL WAS NOT ACCESSIBLE...SO THERE CERTAINLY COULD 
HAVE BEEN MINOR CROP OR TREE DAMAGE IN SOME OF THESE LOCATIONS.

* EVENT TYPE: EF-0 TORNADO.

* INJURIES: NONE.

* ESTIMATED BEGIN TIME/LOCATION: 09/01/2013...642 PM CDT
                                 4 MILES NW OF SERENA IL OR
                                 4.5 MILES W OF SHERIDAN IL
                                 LAT 41.5305 LON -88.7745

* ESTIMATED END TIME/LOCATION: 09/01/2013...647 PM CDT
                               2.5 MILES NW OF SERENA IL OR
                               4.5 MILES WSW OF SHERIDAN IL
                               LAT 41.5070 LON -88.7720

* PATH LENGTH: <2 MILES.

* MAXIMUM ESTIMATED WIND SPEEDS: 65 MPH.

* MAXIMUM ESTIMATED PATH WIDTH: <50 YARDS.

* DISCUSSION: THERE WERE NO DIRECT REPORTS OF SEEING DUST OR DEBRIS 
AT GROUND LEVEL...BUT MULTIPLE EYE-WITNESS REPORTS DID INDICATE THE 
GROUND UNDERNEATH THE FUNNEL WAS MASKED BY TREES OR JUST SIMPLY TOO 
FAR TO SEE DUE TO DISTANCE. ALSO...THE CONDENSATION OF A FUNNEL DOES 
NOT ALWAYS REACH THE GROUND WITH A TORNADO...WHILE THE ROTATING 
COLUMN OF AIR DOES. AN INTERESTING NOTE WAS THAT THREE PUBLIC 
ACCOUNTS FROM VERY NEARBY TO THE LIKELY TORNADO INDICATED IT WAS 
VERY STILL AS THE CONDENSATION FUNNEL PASSED. BASED ON ENVIRONMENTAL
ANALYSIS THIS WAS LIKELY DUE TO WEAK LOW-LEVEL INFLOW...WHICH IS NOT 
THE USUAL CASE DURING THE MORE CLASSIC SUPERCELL TORNADOES. THIS IS
PROBABLY ONE REASON THE TORNADO STRUGGLED TO PERSIST.

$$

MTF/MDB