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 March 3, 2007

February 28th Severe Weather Outbreak

Good late afternoon everyone,

Below is the National Weather Service Summary from February 28th. There was one rather long track tornado that they are still assessing as you can see the picture below. Jeremy will answer any of your questions.

new_trackmap.jpg
Click to enlarge (damage paths from the February 28th tornadoes)
February 28 Severe Weather Summary

Severe Weather Makes Early Appearance
Preliminary Event Report
28 Feb – 1 Mar 2007

The last day of February brought significant severe weather to eastern Kansas and northern Missouri. Tornadoes, large hail, damaging winds, and flooding were caused by a strong storm system that moved into the region from Oklahoma during the afternoon and continued through the nighttime hours.

The dynamics from this storm provided extreme lift for a rapid development of thunderstorms in the early evening hours of February 28th. Low level moisture was initially limited but surface low pressure and an accompanying warm front moved into the region, increasing the low level instability. This warm front provided the focusing mechanism for storms to develop in the early evening. Increasing wind shear was also a major factor as a low level jet strengthened ahead of the storm and a 150 kt upper level jet was located just to the southwest of the area. This upper level jet also provided very strong upper level divergence which added another ingredient for the severe storm development.

Storms initiated along the warm front in eastern Kansas in the late afternoon/early evening. The first report of severe weather in the Kansas City area was received at 616pm, as 1 inch hail fell in Overland Park, KS.

The “main event? was a supercell which developed in eastern Kansas and produced a tornado in Anderson County (see www.weather.gov/topeka for reports from the NWS Forecast Office in Topeka) at around 645pm. This supercell crossed into Linn County, KS and produced a large tornado 4 miles north of Blue Mound. The tornado’s rating is still being investigated and will be updated on this website next week. One home north of Blue Mound was destroyed, with six more homes sustaining minor damage, and about a dozen outbuildings damaged or destroyed; trees and power lines were downed as well. Below are pictures of the damage taken March 1st from Linn County, KS. The resident of the destroyed home in the first several pictures took shelter in the basement, and walked away with no injuries.

Posted by at March 3, 2007 3:23 PM

Comments

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YES! first comment!
that definitely was a crazy night! but hey gary, i asked jeremy this the other day and he never gave me an answer, how close wwas that storm cell that blew through harrisonville cuz my sister lives down there and she said it got really eerie and scary for a few minutes. hey by the way, i was watchin your forecast when i found out that it was headin toward harrisonville, and my sister was sleepin so i had to call and wake her up. i know i said it already, but thanks for all the hard work you put into that broadcast that night.
randy in chillicothe

*********

Randy,

The tornado was roughly 18 miles from Harrisonville. A little too close for comfort. Good idea giving your sister a call!

Jeremy

Posted by: Randy at March 3, 2007 3:31 PM

It would be interesting to see some pictures of the damamge. With recently learned skill as how to analyze the data, using the DIs and other factors, it would interesting to see if I learned it correctly. Regardless, EF2s are nothing to sneeze at. Very impressive storms, especially the long track.

That being said, as much as instability/convection is normally considered a pillar of tornadic development, I learned this week that not necessarly. Cold season storms don't necessarly need much instability/convection if sheer is very strong and low level moisture is present. Also learned is near triple points, almost all cold season storms with any power at all, it should be watched for severe weather.

In this case, we had oodles of sheer, the upper level wind strength, lower level moisture return an some..some convection of up to 500-800 j/Kg, and some mid level instability.

This only works in the winter time or when the jet is this far south. As the jet returns, convection and instability fill the gap needed for mesocyclones.

Posted by: Scott at March 3, 2007 4:27 PM

********
Hello Gary! I am the viewer that blogged about the Kingsville tornado. The night of the storm, the wind went from dead calm to a very loud "roar", like a freight train and winds that very from every direction and so strong that you couldn't even walk in it.(Also experienced golf ball size hail but very little rain.) My leg is still black and blue from the car door slamming on it. I noticed this morning, besides our siding being damaged and the swing being tossed, that our ceiling now has a crack in it that was not there before the storm. When the storm hit, it was like some sort of explosion and the house "rocked". Guessing that is what caused the damage. I was wondering if the national weather service has any confirmation of a tornado on the ground near us. I have heard reports of it, but any reports of any damage from it, unless it did hit near our house.

**********

Kimberley,

Thanks again for keeping us posted! I would recommend emailing the NWS and telling them your experience and also what type of damage you had. Sometime tornadoes touch down for a few seconds and then lift back into the cloud. There may have been a tornado nearby...but the only way the NWS will look into it is if someone reports a tornado on the ground or damage. Since these tornadoes moved through some rural areas and not towns...there was only damage in spots. If you do email them make sure to let them know the time you heard the sound and experienced the wind and about how long it lasted. They can look back on archieved radar data to see if any rotation was visible on the radar near your location. Please let us know what they say.

Jeremy

Posted by: Kimberley at March 3, 2007 7:30 PM

**********
Hey,

Were you able to grab any time lapse vid of the lunar eclipse?

Although we didn't get totality from here in KS, we did get a nice view with the crisp, dry, clear skies. I shot several photos from moonrise (when the eclipse was in progress) through it's progression back to full and posted them online - see them by clicking my name below.

**********

Jake,

Thanks for the pictures! Hopefully everyone checked it out! I do have a time lapse that is currently airing on NBC Action Weather Plus!

Jeremy

Posted by: Jake at March 3, 2007 8:11 PM

 
 

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