Wednesday, April 27, 2011

Running ring around hurricanes predictions

Liz Ahlberg in Space Daily: Coastal residents and oil-rig workers may soon have longer warning when a storm headed in their direction is becoming a hurricane, thanks to a University of Illinois study demonstrating how to use existing satellites to monitor tropical storm dynamics and predict sudden surges in strength.

"It's a really critical piece of information that's really going to help society in coastal areas, not only in the U.S., but also globally," said atmospheric sciences professor Stephen Nesbitt. Nesbitt and graduate student Daniel Harnos published their findings in the journal Geophysical Research Letters.

Meteorologists have seen large advances in forecasting technology to track the potential path of tropical storms and hurricanes, but they've had little success in predicting storm intensity. One of the biggest forecast problems facing the tropical meteorology community is determining rapid intensification, when storms suddenly transform into much stronger cyclones or hurricanes.

"Rapid intensification means a moderate-strength tropical storm, something that may affect a region but not have a severe impact, blowing up in less than 24 hours to a category 2 or 3 hurricane," Harnos said. "This big, strong storm appears that wasn't anticipated, and the effects are going to be very negative. If you don't have the evacuations in place, people can't prepare for something of the magnitude that's going to come ashore."

For example, Hurricane Charlie, which hit southern Florida in 2004, was initially forecast as a category 1 storm. However, when it made landfall less than 24 hours later, it had strengthened to a category 4, causing major damage….

Destruction remains throughout rural Florida in 2005 (though the story says Charlie occurred in 2004), hard hit by Hurricane Charlie. FEMA Photo/Leif Skoogfors

No comments: