WeatherTalk: Last week, humid weather delivered few strong storms
The reason for this was a weather pattern with very weak wind in the upper atmosphere.
FARGO - Last week's rather humid weather brought numerous showers and thundershowers, but produced almost no severe weather. The reason for this was a weather pattern with very weak wind in the upper atmosphere. When a thundershower forms in such an environment, the falling rain snuffs out the rising air underneath, and the thundershower dies.
When rising air encounters stronger wind as it rises, the rising column develops a tilt as it rises, falling rain does not choke the shower's inflow, and the storm is able to last much longer and grow much taller and stronger. When the stronger wind aloft changes direction with height, the rising column of air is made to rise even faster. The structure of the upper level wind, which cannot be sensed from the ground, is at least as important to storm development as the temperature and humidity we can feel.