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Nation/World

September 11, 2013

Quiet, not stormy, weather for US this year so far

WASHINGTON — After a couple of years of wild, deadly and costly weather, the United States is mostly getting a lucky break this year. So far.

Summer is almost over, and as of yesterday morning, not a single hurricane had formed this year. Tornado activity in 2013 is also down around record low levels, while heat waves are fewer and milder than last year, according to the National Oceanic and Atmospheric Administration.

Meteorologists credit luck, shifts in the high-altitude jet stream, and African winds and dust.

“It’s been great,” said Deke Arndt, climate monitoring chief for NOAA’s National Climatic Data Center in Asheville, N.C. “I hope that we ride this pattern out through this year and following years.”

There have been eight tropical storms in the Atlantic. Not one has reached the 74 mph wind threshold to become a hurricane, though Tropical Storm Humberto off the coast of Africa is likely to become one soon.

If Humberto stays a tropical storm through 8 a.m. EDT today, it will be the latest date for the first hurricane of the season since satellites started watching the seas in 1967, according to the National Hurricane Center.

This year, overall storm activity in the Atlantic — an index that combines number and strength — is about one-fifth the average. That’s despite warmer-than-normal seas, which usually fuel storms.

It has also been a record of nearly eight years since a major hurricane — one with winds of 110 mph — blew ashore in the United States. That was Hurricane Wilma, which hit Florida in October 2005.

Meteorologists say dry, stable and at times dusty air blowing from Africa is choking storms instead of allowing them to grow. On top of that, shifts in the jet stream — the same river of air some blame for wild weather in 2011 and 2012 — have caused dry air and wind shear, which interfere with storm formation, said Gerry Bell of NOAA’s Climate Prediction Center. Plain old random chance is also a big factor, said MIT meteorology professor Kerry Emanuel.

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