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Description: Very moist and unstable air moved over Iowa during the early morning of the 25th. A warm front was located to the south of the state as a series of strong upper level disturbances lifted northeast across the central U.S. The jet stream was unseasonably strong with a jet of 100 kts lifting northeast out of the southwest U.S. The airmass was quite unstable with lifted indices around -8 C., and CAPE values of around 2500 J/kg. This set the stage for a severe weather event that was more driven by strong dynamics then by further destabilization of the atmosphere. Thunderstorms moved into southwest Iowa from eastern Nebraska during the morning hours. The storms took on more of a bow echo type configuration as the raced east and northeast across southwest and central Iowa at 45 to 55 kts. There were several reports of high winds and tree damage as the storms passed. A few of the stronger storms produced hail with golf ball size hail reported south of Mount Ayr in Ringgold County. |
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| This page dynamically generated 24 Nov 2009 from: http://www4.ncdc.noaa.gov/cgi-win/wwcgi.dll?wwEvent~storms Please send questions or comments about this system to Stuart.Hinson@noaa.gov Please see the NCDC Contact Page if you have questions or comments. | |||