Jun 17, 2016

Recent Trends in Northern and Southern Hemispheric Cold and Warm Pockets

by
Richard Grumm and Anne Balogh
,
National Weather Service and Penn State University Monograph

Finds that from 1980 - 2010:

  • Areas covered by extreme cold air in cold seasons decreased significantly in the northern hemisphere; observed trend was negative but not statistically significant in the southern hemisphere
  • Areas covered by warm air during summer seasons increased significantly in both hemispheres
  • The northern hemisphere is tending toward increasingly warmer and more humid summers: "overall, more warm air, larger ridges, and warmer air"
  • During the warm season, the global area covered by precipitable water values equal to or greater than 60mm is increasing
  • The significant changes in weather are "occurring in the tails of the distribution"