Severe Weather Summary - June 15, 2009

 

In what has been an incredibly active and wet pattern during the past two weeks, yet another round of severe thunderstorms brought torrential rainfall and wind damage to the area.  Late Monday afternoon, large supercell thunderstorms developed across portions of central Kansas and began to lift northeastward towards eastern Kansas and western Missouri.  As these storms moved east, they began to merge into a large cluster of storms called a "Mesoscale Convective System" or MCS.    These storms were able to interact with a highly unstable environment south of a warm front which was stalled from the northeast corner of Kansas to the southeast corner of Missouri.    Favorable conditions were present for the development of bowing segments with the potential for damaging winds as these storms moved eastward.  Two such bowing segments reached eastern Kansas and western Missouri around 10 pm Monday, with radar velocity signatures from Franklin and Anderson counties  (estimates on how strong the winds aloft are) showing in excess of 104 knots!  These incredibly strong winds transferred down to the surface in locations from Beagle to Fontana and further east towards Drexel and Adrian as these storms moved through after 11 pm.  A National Weather Service storm survey team reported that widespread tree and isolated structure damage was present across much of southern Miami, southern Cass, Northern Linn, and Northern Bates counties with estimated wind speeds between 90 and 110 mph!  While these storms were not tornadic in nature, these strong wind speeds correlate comparibly to the strength of an EF-1 rated tornado.

 

Severe Storm Reports - June 15, 2009
 

A second bowing segment worked through the southern portions of the Kansas City metropolitan areas, producing measured and estimated winds 60 mph and greater from Desoto Kansas through Olathe and further east towards Lees Summit.  While wind damage was not as significant in these areas, several reports of trees and powerline damage were reported.  The snapshots below show just how powerful this storm complex was as it moved through the area. 

 

Click on the Image for a Larger Version Click on the Image for a Larger Version
104 Knot Wind Represented on Radar Dual Bowing Structures
Click on the Image for a Larger Version
Strongest Bow Weakened, with Northern bow remaining Strong Storms Continue to Weaken

All in all, these powerful storms knocked out power to an estimated 200, 000 residents across eastern Kansas and western Missouri, including damaging 22 power poles in the city of Drexel itself. The images below were captured from Kansas City Power and Lights, "PowerWatch" which monitors local power outages in the area.  

Kansas City Power and Light Powerwatch Kansas City Power and Light Powerwatch
Kansas City P&L PowerWatch - 9am Kansas City P&L PowerWatch - 9am

Unfortunately, this initial round of storms would not be the last of the evening as a second large complex of thunderstorms was developing at the same time back in northwestern Kansas and north central Nebraska.  These thunderstorms similar to ones early in the evening, plunged southeast towards the lower Missouri River Valley.  While not as strong as those earlier in the night, torrential rainfall prompted flash flood warning across the region.  The heaviest rainfall fell across locations to the south of Interstate 70, where average totals between 2 and 4 inches were commonly reported.  However, the highest total for the overnight hours had fallen at Osawatomie, KS where cooperative observers recorded 5.80"!  As you can imagine this heavy rain caused widespread areal and river flooding which will continue for several days. Below is a listing of the top 10 heavy rainfall reports from the past 2 days of rain:

City Rainfall Amount
Osawotomie, KS 5.80"
Savannah, MO 5.38"
Drexel, MO 5.30"
Windsor, MO 5.25"
Archie, MO 4.22"
Sedalia, MO 4.09"
Clinton, MO 4.03"
Moberly, MO 4.02"
Paola, MO 3.87"
Green Ridge, MO 3.87"
Butler, MO 3.77"
Other Local Sites
Kansas City Inter. 2.53"
Olathe, KS 3.34"
Lees Summit, MO 2.66"

 


 

Damage Photos:

The following are damage photos from in and around Drexel, MO where the heaviest damage was located.

 

 


Official Storm Reports:

Tornado Reports

Time (UTC) Location County State Lat Lon Comments
No Reports

Hail Reports

Time (UTC) Size (inches) Location County State Lat Lon Comments
No Reports

Wind Reports

Time (UTC) Speed (mph) Location County State Lat Lon Comments
0326 UNK 6 S OSAWATOMIE MIAMI KS 38.42 -94.95 MAJOR TREE DAMAGE NEAR THE TOWN OF BEAGLE. DEPUTYS CAR BLOWN ACROSS THE ROAD WHILE PARKED. (EAX)
0328 60 5 SW OSAWATOMIE MIAMI KS 38.45 -95.02 POWER IS OUT. (EAX)
0331 UNK PARKER LINN KS 38.33 -94.99 NUMEROUS TREES REPORTED DOWN (EAX)
0337 60 TROY DONIPHAN KS 39.79 -95.09 ESTIMATED WIND GUST 60 MPH. TREE 2 FOOT IN DIAMETER BLOWN DOWN ON 312 SOUTH MAIN IN TROY (EAX)
0350 UNK PLEASANTON LINN KS 38.18 -94.71 TREE BLOWN ONTO A RESIDENCE (EAX)
0356 60 OLATHE JOHNSON KS 38.89 -94.81 (EAX)
0357 UNK RICH HILL BATES MO 38.1 -94.36 TREES DOWN. (EAX)
0357 70 4 N DREXEL CASS MO 38.54 -94.61 ALONG B HWY. HEAVY RAIN AND LIGHTNING. (EAX)
0357 UNK OVERLAND PARK JOHNSON KS 38.91 -94.68 115TH AND ANTIOCH. 2 FOOT TREES DOWN. (EAX)
0400 90 5 S DREXEL BATES MO 38.41 -94.61 DREXEL FIRE CHIEF REPORTED ESTIMATED WIND GUST 90 MPH. HOUSE BLOWN OFF FOUNDATION. (EAX)
0400 UNK DREXEL CASS MO 38.48 -94.61 HIGHWAY PATROL REPORTED MOBILE HOME PARK STRUCK WITH 5 TRAILERS DAMAGED (EAX)
0412 70 2 S LEE'S SUMMIT JACKSON MO 38.89 -94.38 AT HWY 150 AND WARD ROAD (EAX)
0425 UNK 4 E CLINTON HENRY MO 38.37 -93.69 BARN BLOWN DOWN AT HWY W AND SE 500 ROAD. (EAX)
0425 70 8 W CLINTON HENRY MO 38.37 -93.92 (EAX)
0427 60 RAYTOWN JACKSON MO 38.99 -94.47 (EAX)
0445 UNK WARRENSBURG JOHNSON MO 38.76 -93.73 TREES AND POWER LINES DOWN. TREE ACRS HWY DD EAST OF KNOB NOSTER STATE PARK. TREES DOWN HWY ON HWY 13 NORTHBOUND. (EAX)
0452 58 WHITEMAN AFB JOHNSON MO 38.73 -93.55 WHITEMAN PERSONNEL REPORTED PEAK WIND GUST OF 50 KNOTS (EAX)
0501 60 LA MONTE PETTIS MO 38.77 -93.42 (EAX)
0507 UNK 6 S HIGGINSVILLE LAFAYETTE MO 38.98 -93.73 DELAYED REPORT OF POWER LINES DOWN ON 13-HWY NEAR INTERSTATE-70. THE SOUTHBOUND LANE OF 13-HWY WAS REPORTED CLOSED AT I-70 BY MISSOURI DEPT OF TRANSPORTATION. TIME APPR (EAX)
0510 60 SEDALIA PETTIS MO 38.7 -93.23 LASTED 10 MINUTES. (EAX)



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