Daily Archives: August 5, 2013

During our mini heat wave of July 16-19, the Northern Hemisphere reached its warmest day of the year, by one measure, on July 17.

On that day, at about 1 mile above sea level, it was warmer than 23 degrees everywhere in the hemisphere. Just a day or two later, the buildup of cold air at that elevation in the atmosphere began again for the coming winter season. Continue reading →