403
NOUS43 KLSX 120219
PNSLSX
ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-122200-
PUBLIC INFORMATION STATEMENT..UPDATED..
NATIONAL WEATHER SERVICE ST LOUIS MO
910 PM CDT SAT JUN 11 2011
..DAMAGE SURVEY INFORMATION FOR RALLS COUNTY FROM JUNE 9TH 2011
NWS PERSONNEL CONDUCTED A SURVEY OF THE DAMAGE THAT OCCURRED OVER
NORTHERN RALLS COUNTY ON THE EVENING OF JUNE 9TH 2011. IT APPEARS
THAT STRAIGHT LINE...DOWNBURST...SEVERE THUNDERSTORM WINDS CAUSED
THE DAMAGE THAT OCCURRED IN THE AREA.
THE DAMAGE BEGAN ABOUT 4.5 MILES EAST-SOUTHEAST OF RENSSELAER...0.5
MILE EAST OF THE INTERSECTION OF TRABUE LANE AND CHEROKEE ROADS AND
ENDED ABOUT 0.75 MILE EAST OF HIGHWAY 61. THE DAMAGE SWATH WAS ABOUT 1
MILE WIDE.
EMBEDDED IN THIS SWATH OF DOWNBURST WIND DAMAGE WAS AN ISOLATED AREA
OF GREATER DAMAGE CAUSED BY A MICROBURST...JUST ON THE WEST SIDE OF
HIGHWAY 61 AND AND 0.25 MILE SOUTH OF TRABUE ROAD. OVER 80 PERCENT
OF THE ROOF OF ONE HOME WAS UPLIFTED AND TOSSED TO THE WEST ABOUT 40
TO 50 YARDS. WITNESSES FROM TWO ADJACENT HOMES DESCRIBED THE STRONG
EASTERLY WINDS AS THEIR OVERHANGS WERE BRIEFLY UPLIFTED AND THEN
DROPPED BACK ON THE PILLARS. ALL OF THE TREES THAT WERE UPROOTED OR
SNAPPED BEHIND THE THREE HOMES FELL TO THE WEST SOUTHWEST TO WEST
NORTHWEST AND REVEALED A DIVERGENT DAMAGE PATTERN. THE BILLBOARDS ON
THE NORTH SIDE OF THE DAMAGE AREA FELL TO THE NORTH. DAMAGE THAT
OCCURRED TO ONE HOME SUGGESTED WIND SPEEDS MAY HAVE HAVE REACHED 100
MPH.
FROM HIGHWAY 61 TO 0.75 MILE EAST OF 61 A NUMBER OF TREES WERE
UPROOTED OR SNAPPED HALF WAY. ALL OF THE TREES FELL TO THE NORTHEAST
TO EAST SOUTHEAST. THIS SUGGESTED OF A DAMAGING DOWNBURST PATTERN.
WITNESSES IN THE AREA REPORTED THAT THE STORMS ARRIVAL WAS ANNOUNCED
BY NICKEL TO GOLF-BALL SIZED HAIL....FOLLOWED BY A MIX OF RAIN AND
SMALLER HAIL...AND THEN THE STRONG DAMAGING WINDS. DAMAGING WINDS
USUALLY OCCUR ALONG THE LEADING EDGE OF STORMS OR A LINE OF STORMS.
IN THIS CASE THE OPPOSITE OCCURRED IN WHICH THE DAMAGING WINDS
OCCURRED ALONG THE TRAILING SIDE OF THE STORM.
PRZYBYLINSKI/SNYDER/STALLEY
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