PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
342 PM CDT MON JUN 8 2009
…FINAL DAMAGE SURVEY RESULTS FOR DALLAS COUNTY…
…BRIEF PATH OF TORNADIC DAMAGE SOUTH OF DALLAS CENTER…
THE FOLLOWING IS A FINAL ASSESSMENT FOR THE DAMAGE THAT OCCURRED OVER DALLAS COUNTY ON JUNE 7 2009.
* EVENT DATE: JUNE 7 2009
* ESTIMATED START TIME: 633 PM
* EVENT TYPE: (EF0) TORNADO
* EVENT LOCATION: 3 MILES SOUTH OF DALLAS CENTER TO 3 MILES SOUTH SOUTHEAST OF DALLAS CENTER
(41.64N -93.96W TO 41.64N -93.93W)
* PEAK WIND: 75 MPH
* AVERAGE PATH WIDTH: 100 YARDS
* PATH LENGTH: 1.5 MILES
* INJURIES: 0
* FATALITIES: 0
* DISCUSSION/DAMAGE: A PATH OF STRAIGHT LINE WIND DAMAGE BEGAN ON THE SOUTHWEST CORNER OF ADEL AND PROGRESSED EAST NORTHEAST THROUGH THE SOUTHERN AND CENTRAL PORTION OF CITY. DAMAGE CONSISTED OF MAINLY TREE DAMAGE WITH LITTLE STRUCTURAL DAMAGE…WITH THE EXCEPTION WHERE A FEW TREES AND BRANCHES FELL ON HOUSES. THE WINDS CONTINUED TO PRODUCE TREE DAMAGE ACROSS HILLCREST GOLF COURSE WITH A MORE INTENSE AREA OF WIND DAMAGE LOCATED JUST EAST OF THE GOLF COURSE ALONG PROSPECT AVENUE WHERE SEVERAL LARGE TREES WERE BLOWN DOWN.
DAMAGE FROM THE WEAK EF0 TORNADO WAS FIRST OBSERVED WITH A 10 YARD WIDE PATH OF DAMAGE THROUGH A CORN FIELD NEAR THE INTERSECTION OF R AVENUE AND 278TH ST. THE WEAK PATH CONTINUED 1.5 MILES TO THE EAST WITH THE MOST INTENSE DAMAGE LOCATED ALONG 270 ST. A 30 YARD CONVERGENT PATH OF SEVERE TREE DAMAGE THROUGH THIS RESIDENCE AND ENDED SHORTLY TO THE EAST. FALLEN TREES DAMAGED A GARAGE AND VEHICLES AT THIS RESIDENCE. THE MESOCYCLONE WEAKENED AFTER THIS POINT.
A NEW AREA OF ROTATION DEVELOPED NEAR GRIMES AND BEGAN TO PRODUCE STRAIGHT LINE WIND DAMAGE TO TREES IN NORTHWEST SECTIONS OF GRIMES. THE PRIMARY AREA OF STRAIGHT LINE TREE DAMAGE WAS LOCATED OVER THE NORTH HALF OF GRIMES. VERY MINOR STRAIGHT LINE WIND TREE DAMAGE OCCURRED EAST OF HIGHWAY 141 EAST OF THE GRIMES AREA AND THROUGH NORTHERN JOHNSTON. OTHER PORTIONS OF JOHNSTON AND THE DES MOINES AREA WERE NOT SURVEYED FROM THE GROUND.
IN ALL CASES…THE AREAS OF STRAIGHT LINE WIND DAMAGE WERE CORRELATED AND CONCENTRATED IN NARROW PATHS ALONG THE SOUTHERN PERIPHERY OF THE MESOCYCLONES AS DETECTED ON RADAR.