Do Squall Lines Weaken over the Great Lakes?
Like so many other weather phenomenon the answer is 'it depends.' Squall lines moving over a Great Lake will - weaken if the water temperature is coolish because the chilly air overlying the Lake will be heavy and resist being lifted. - be less likely to weaken if the water temperature is warmish because the mild air overlying the Lake will be lighter and not be as resistant to being lifted. - be even less likely to weaken if the water temperature is warmish and the wind ahead of the line is southerly during the summer. Not only will the mild air overlying the Lake will be lighter and not as resistant to being lifted but the southerly wind flow will feed a supply of warm, moist, and unstable air ahead of the line. .
In what area do typhoons usually occur?
Typhoons occur in the Pacific Ocean and the Indian Ocean; Hurricanes occur in the Atlantic Ocean.
Hurricane Catarina?
it's called Cyclone Catarina. Cyclone Catarina was an extremely rare South Atlantic tropical cyclone. Catarina hit southeastern Brazil in late March of 2004, and though not the first southern Atlantic tropical cyclone, it was the first positively identified hurricane-strength system in the basin. Formation: Catarina developed off a cold-core stationary upper-level trough became established offshore southern Brazil on March 12, 2004. Whether Catarina was a result of global warming is still debatable. There have been claims of global warming, but none has been solidly proved, as yet. Typically, tropical cyclones do not form in the South Atlantic Ocean, due to strong upper level shear, cool water temperatures, and the lack of a convergence zone of convection. Occasionally though, as seen in 1991 and early 2004, conditions can become slightly more favorable. Formation of another storm in the same region with similar intensity is extremely rare, because at the time, it was the 'strongest ever'. However, there have been other similar but less intense South Atlantic storms like the Angola tropical cyclone of 1991 and another cyclone in the same area in Brazil in mid/late January of 2004. References: http://www.answers.com/topic/south-atlantic-tropical-cyclone http://www.answers.com/hurricane%20catarina http://www.aoml.noaa.gov/hrd/tcfaq/G7.html