Great Lakes Intensify Ferocity Of Passing Storms, Scientists Say

October 31, 1997

CHAMPAIGN, Ill. -- The Great Lakes exert a significant influence on passing cyclones, causing storms to speed up and grow in strength, say researchers at the University of Illinois and the Illinois State Water Survey. Also, the number of potentially dangerous storms is on the rise, they report.

"Cyclones that traverse the Great Lakes have important impacts on the physical environment and human habitation in the region," said James Angel, a climatologist with the Survey. "There is a lot of development along the lakes, and when the water level is high -- as it is now -- the area becomes extremely vulnerable to shoreline damage from these storms. A better understanding of how the Great Lakes affect passing cyclones may allow better forecasting of these storms and their potential effects."

Cyclones are low-pressure storm centers, "often accompanied by high winds and heavy precipitation," said Scott Isard, a U. of I. professor of geography. "The ensuing storms can be huge, ranging in size from 800 to 1,500 miles in diameter."

To study the effect the Great Lakes have on passing cyclones, Angel and Isard examined the rates of movement and the changes in intensity for 583 cyclones that passed over the region between the years 1965 to 1990. The researchers' findings, published in the September issue of Monthly Weather Review, identify several important features regarding the lakes' influence on these storm systems.

"In general, we found that cyclones accelerated as they approached the Great Lakes region and increased in intensity over the lakes," Angel said. "This effect was most pronounced from September to November, when the surface waters of the lakes are warmer than the surrounding air and can provide a major source of both moisture and heat that energizes passing storms."

From January to March, when broken ice cover is generally present on the lakes, cyclones accelerated less and did not intensify, Angel said. However, cyclones that traversed the region during May and June did speed up and grow in strength.

"This surprised us, because the lakes are usually cooler than the overriding air mass during spring and summer, and have not generally been considered as an important energy source for cyclones at that time," Angel said. "We don't yet have a satisfactory explanation for this phenomenon."

In another study (to appear in the journal Climate), Angel and Isard analyzed trends in storm strength for the years 1900 to 1990. "We are seeing evidence of an increase in the number of stronger storms, particularly in the months of November and December," Angel said.Historically, some of these cyclones have produced hurricane-force winds and caused extensive damage to shipping. The "great storm of 1913," for example, sank a dozen ships and claimed more than 250 lives. More recently, the ore carrier Edmund Fitzgerald -- popularized in a ballad by Canadian singer and songwriter Gordon Lightfoot -- sank in Lake Superior during a major storm on Nov. 10, 1975. All hands were lost.
-end-


University of Illinois at Urbana-Champaign

Related Cyclones Articles from Brightsurf:

Scientists define binary tropical cyclones
A new research established an objective standard for defining binary tropical cyclones.

Effective government saves lives in cyclones, other disasters
Effective national and local governments are associated with fewer deaths from tropical cyclone disasters -- even in countries with similar levels of wealth and development.

New dataset provides county-level exposure numbers for tropical cyclones, human health
The new open source data set can be used for epidemiological research on tropical cyclones.

Tropical cyclones moving faster in recent decades
Tropical cyclones, regionally known as hurricanes or typhoons, have been moving across ocean basins faster since 1982, according to a new study by researchers at the University of Hawaii at Manoa.

NASA imagery reveals Kujira transitioning into an extratropical cyclone 
Tropical cyclones can become post-tropical before they dissipate, meaning they can become sub-tropical, extra-tropical or a remnant low-pressure area.

NASA satellite found Post-Tropical Storm Alpha fizzle over Portugal and Spain
Former Subtropical Storm Alpha was a short-lived storm that formed and fizzled within 24 hours.

Researchers find link between Atlantic hurricanes and weather system in East Asia
Climate researchers led by the University of Iowa have found a link between hurricanes that form in the Atlantic Ocean - and threaten the United States - and a weather system in East Asia.

HKBU research reveals greater flood risks in the coastal region of China
A research led by the Department of Geography at Hong Kong Baptist University (HKBU) has revealed that the observed average moving speed (or translation speed) of tropical cyclones making landfall over the coast of China dropped by 11% between 1961 and 2017.

Edouard now post-tropical in NASA-NOAA satellite imagery
When NASA-NOAA's Suomi NPP satellite passed over the western North Atlantic Ocean on July 6, it provided forecasters with a visible image of Edouard after it transitioned into a post-tropical cyclone.

NASA finds post-Tropical Cyclone Dolly exiting the tropical stage
NASA's Terra satellite provided a night-time look at what is now Post-Tropical Storm Dolly in the Northern Atlantic Ocean.

Read More: Cyclones News and Cyclones Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.