Severe Weather Impacts Area 4/24/08

Severe Weather Impacts Tri State Area

4/24/08

        Powerful thunderstorms developed across portions of the Tri State Area during the evening of April 24th. These storms produced very large hail up to softball size and wind gusts up to 80 mph. A brief tornado was also reported near Morland Kansas. The storm that produced the most severe weather across the area continued across much of northern Kansas through the night and produced a series of tornadoes. The last tornado was reported 126 am CDT near Agenda Kansas. This storm first formed around 7 PM CDT and produced severe weather for over 5 hours. The following image is of prelimanary storm reports for the entire country on April 24th, which highlights the large swath of severe weather that this storm produced. Clicking on the image will allow you to see all the individual reports. Map and summary from the Storm Prediction Center.

 

       Thunderstorms began to develop around 6 PM CDT along a Burlington to Colby line, with another area of thunderstorms developing along an approaching cold front.  The image on the left shows visible satellite imagery and lightning data. The blue line represents the approaching cold front, while the green contours highlight the area of strongest instability. Radar reflectivity (Z) at 620 PM CDT (right) indicated that a storm along the Thomas and Rawlins County border had rapidly became severe, with strong reflectivities indicating large hail.

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6 PM CDT Visible Satellite/Lightning Data

6 PM CDT Reflectivity (Z)

       By 720 PM CDT two strong storms were impacting the area. The first was entering southwest Nebraska and was producing quarter size hail and winds in excess of 60 mph. The other storm of interest was moving southeast out of Rawlins county into northeast Thomas, southern Decatur and northern Sheridan county.  The image on the right is radar reflectivity taken at this time. Two tight reflectivity notches were observed on the southern half of this storm. The notches are indicitive of a strong updraft. Storm Relative Velocity (SRM) images on the right show to areas of rotation, both associated with the two updrafts. Green colors in SRM data indicate motion towards the radar, and red indicates motion away from the radar. Brighter colors indicate higher speeds. Storm chasers reported a funnel cloud associated with the westen updraft, but the strong updraft near Selden quickly became the strongest part of the storm. Softball size hail was reported in Selden 11 minutes after this radar image was taken. This storm would continue on for over 5 hours across northern Kansas.

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720 PM CDT Reflectivity (Z)

720 PM CDT Storm Relative Motion (SRM)

       The storm continued to intensify into a strong supercell thunderstorm as it moved to the east southeast across Sheridan  County and into Graham County.  As the storm moved to the east it continued to produce a swath of golfball to softball size hail. By 925 PM CDT the storm was located near Hill City. A strong reflectivity notch continued to be observed on the southeast flank of the storm, colocated with an area of strong rotation. A brief tornado was reported 1 mile north of Morland shortly before these radar images were taken.

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935 PM CDT Reflectivity (Z)

935 PM CDT SRM

         The storm remained intense as it shifted to the east, with the strongest circulation near Bogue at 948 PM CDT. The storm continued to move to the east and exited the Goodland county warning area around 1020 PM CDT.  The storm would continue to produce severe weather through the nght across northern Kansas.

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948 PM CDT Reflectivity (Z)

948 PM CDT SRM

JRM 4/25/2008



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