Saturday, June 18, 2011

3rd International Summit on Hurricanes & Climate Change

June 27-July 2, 2011, Rhodes, GREECE. It promises to be a good one. Check out the program. Props go to Ian Elsner for designing and editing the video.

Friday, June 17, 2011

Crazy guys yelling at a tornado

While hot air swirls on whether climate change is affecting tornadoes, I take a break on May 24, 2011 to chase down a few storms in Oklahoma with my son Ian and his friend Nic Parsons.

Monday, June 13, 2011

Hurricane clusters in the vicinity of Florida

Models that predict annual U.S. hurricane activity assume a Poisson distribution for the counts. This assumption leads to a forecast that under predicts both the number of years without hurricanes and the number of years with three or more Florida hurricanes. The under dispersion in forecast counts arises from a tendency for hurricanes to arrive in groups along this part of the U.S. coastline. We recently developed an extension to our earlier Poisson model that assumes the rate of hurricane clusters follows a Poisson distribution with cluster size capped at two hurricanes.

Hindcasts from the cluster model better fit the distribution of Florida hurricanes conditional on the climate covariates including the NAO and SOI. Results are similar to models that parameterize the extra-Poisson variation in the observed counts including the negative binomial and the Poisson inverse Gaussian, but we argue that the cluster model is physically consistent with the way Florida hurricanes tend to arrive in groups.

This research is done in collaboration with Thomas H. Jagger (Climatek) and is supported by the Risk Prediction Initiative. It is currently in review with the AMS Journal of Applied Meteorology and Climatology.