Upper Air Charts

Here is a series of upper air maps from 20 June 1957 at  6 am CST (12 UTC), and 6PM CST (0000 UTC) on 21 June 1957(around the time of the tornado).  The upper air pattern was characterized by a southwest flow aloft, and moisture returning into the northern plains.  Images courtesy of Jonathan Finch (NWS DDC). 

 

6 AM CST (12 UTC) 20 JUNE 1957

Upper Air Chart
12 UTC 250 hPa
Upper Air Chart
12 UTC 500 hPa
Upper Air Chart
12 UTC 700 hPa
 
Upper Air Chart
12 UTC 850 hPa
Upper Air Chart
12 UTC 900 hPa
 

6 PM CST (00 UTC) 21 JUNE 1957

Upper Air Chart
00 UTC 250 hPa
Upper Air Chart
00 UTC 500 hPa
Upper Air Chart
00 UTC 700 hPa
 
Upper Air Chart
00 UTC 850 hPa


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