The featured chart depicts May, June, and July yearly averaged 500 hPa level heights from the Omaha area sounding site. This year's value, so far, is the highest on record and an indicator of the warm conditions that have prevailed during this period. Soundings are the twice daily released balloons that profile the temperature, pressure, humidity and wind condition of the atmosphere. The high height of the 500 hPa surface is an indication of warmth of the air between the ground surface and that height.

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Tags:   sounding