Severe Thunderstorms Produced Damaging Wind Gusts Across Northeast Kansas During The Late Evening Hours Of Thursday, August 18th.
A large complex of thunderstorms developed during the late afternoon and early evening hours of Thursday, August 18th, across eastern Nebraska and western Iowa. As the complex of thunderstorms moved southward into northeast Kansas, a line of severe straight line winds pushed ahead of the complex of thunderstorms causing widespread wind damage, east of a Manhattan to Emporia Line. The Topeka National Weather Service recorded a 70 MPH wind gust at 11:04 PM CDT.
Below is an image of the National Weather Service Doppler radar reflectivity. You can see a fine line pushing ahead of the main complex of thunderstorms. This fine line on radar was the leading edge of the severe northerly outflow winds, which gusted from the north at 50 to 70 MPH across much of Northeast Kansas. The heavy rainfall that followed the strong to severe wind gust caused some minor street flooding within the city of Topeka.
The radar loop below shows how the damaging outflow winds accelerated south away from the actual thunderstorms and heavy rains. This is common with lines of storms as they produce a large cold pool of air that moves away from the storm itself. Had this occurred during daylight a distinct shelf cloud feature may have been visible as a indicator of the approaching outflow winds.
The images below were taken from the Oakland neighborhood in Topeka. These scenes were common across parts of Northeast Kansas where tens of thousands of residents lost power due to the storms overnight.
For a complete list and map of thunderstorm wind gusts and damage reports click Here.