Variability of Winter Storminess in the Eastern United States during the Twentieth Century from Tide Gauges

Author:

Thompson Philip R.1,Mitchum Gary T.1,Vonesch Cedric2,Li Jianke3

Affiliation:

1. College of Marine Science, University of South Florida, St. Petersburg, Florida

2. Biomedical Imaging Group, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland

3. IMSG, and NOAA Coral Reef Watch, Silver Spring, Maryland

Abstract

Interannual to multidecadal variability of winter storminess in the eastern United States was studied using water level measurements from coastal tide gauges. The proximity to the coast of the primary winter storm track in the region allows the use of tide gauges to study temporal modulations in the frequency of these storms. Storms were identified in high-passed, detided sea level anomalies in 20 gauges from all coasts of North America to assess variability in winter storminess along particular storm tracks. The primary result is a significant multidecadal increase in the number of storms affecting the southeastern United States from the early to late twentieth century. The authors propose that this change is due to an increased tendency for the jet stream to meander south over the eastern United States since the 1950s. This mechanism is supported by long-term changes in the large-scale sea level pressure pattern over North America. The nature of the multidecadal change in storm frequency is unclear, because limited tide gauge record lengths prevent distinguishing between a trend and an oscillation.

Publisher

American Meteorological Society

Subject

Atmospheric Science

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