As the hurricane season comes to a close, TripAssure looks back at
the storm activity over the year and offers travel protection solutions for those bound for the areas that have been most impacted.
Do model projections tend to show us areas that will see more
storm activity over the coming century as global temperatures warm?
«Cold, hot or dry: Persistent weather extremes associated with decreased storm activity: Decrease in
storm activity over large parts of the US, Europe, Russia, and China is found to influence weather extremes.»
Not exact matches
Peaks in solar
activity cause the city to flood more often, apparently by changing the paths of
storms over Europe.
Ice cores from Mount Hunter in Alaska's Denali National Park and Mount Logan in Canada were used in an analysis of
over 1,000 years of history of the Aleutian Low pressure system that drives
storm activity in the North Pacific.
Reports blamed the conflict for changes in land use and cover — and for
activities like increased military traffic
over unpaved surfaces and farmers reducing irrigation or abandoning agricultural land — that created extreme amounts of dust to fuel the
storm.
The intensification of winter
storm activity in Alaska and Northwestern Canada started close to 300 years ago and is unprecedented in magnitude and duration
over the past millennium, according to a new study from Dartmouth College.
The difference in lightning
activity can't be explained by changes in the weather, according to the study's authors, who conclude that aerosol particles emitted in ship exhaust are changing how
storm clouds form
over the ocean.
The next peak cycle of sunspot
activity is predicted for 2012 - 2014, bringing with it a greater risk of large geomagnetic
storms that can generate powerful rogue currents in transmission lines, potentially damaging or destroying the large transformers that manage power flow
over high - voltage networks.
In May, they reported that 90 percent of the Atlantic
storms followed a period of above - average lightning
activity over the Ethiopian Highlands.
Similar measurements are currently provided by the Lightning Imaging Sensor (LIS); however, this instrument is on a satellite that is in low - earth orbit, which means it is unable to track changes in lightning
activity over the lifetime of a
storm.
In summer,
storm activity calmed down
over as much as 80 percent of the land area in the mid-latitudes.
And the lightning
activity in
storms over the ocean is relatively small.
The article, «Extreme rainfall
activity in the Australian tropics reflects changes in the El Niño / Southern Oscillation
over the last two millennia,» presents a precisely dated stalagmite record of cave flooding events that are tied to tropical cyclones, which include
storms such as hurricanes and typhoons.
Not surprisingly, a
storm has broken out
over research saying human
activities are not the main factor behind climate change.
Additionally, sea level rise driven by climate warming combined with coastal subsidence related to human
activities increased the
storm surge while urban development such as paving
over grasslands and prairies are likely to have exacerbated flooding.
When the annual April 1 measurements came in, Trouet and her colleagues were already looking at the historic climate record contained in old tree rings to see how the locations of
storm activity had changed in the area
over time.
This document provides basic information on projected future climate change effects (changes in temperature, precipitation,
storm activity and sea level rise)
over the near term, mid-century and end - of - century.
Finally — it is not remotely necessary for a season to be as intense as 2005 in order for it to be very intense — after, all, 2004 (15 tropical
storms, 9 hurricanes, 6 major hurricanes) had
over 150 % of the
activity of an average season, yet was much less active than 2005 (28 tropical and subtropical
storms, 15 hurricanes and 7 major hurricanes.)
This is complete speculation on my part, but I wonder whether the unusual
activity of this year's severe
storm season may be related to the exceptional gradient between unusually dry conditions in the western Plains and the very moist conditions not far east
over the Mississippi valley.
The implication is that if climate change, driven by increasing greenhouse gases from human
activity, increases the heat content of the ocean,
storms passing
over it will be able to draw ever more moisture that they can unload as rain.
If so, this is one way in which global warming may end up causing a decrease in Atlantic hurricane
activity over the coming decades, since the increased wind shear
over the Atlantic during El Niño events greatly reduces the number and intensity of these
storms.»
The index revealed that the current low levels of
storm activity on the mid-west and north - east coasts of Australia are unprecedented
over the past 550 to 1500 years.
«The authors write that «the Mediterranean region is one of the world's most vulnerable areas with respect to global warming,»... they thus consider it to be extremely important to determine what impact further temperature increases might have on the storminess of the region... produced a high - resolution record of paleostorm events along the French Mediterranean coast
over the past 7000 years... from the sediment bed of Pierre Blanche Lagoon [near Montpellier, France]... nine French scientists, as they describe it, «recorded seven periods of increased
storm activity at 6300 - 6100, 5650 - 5400, 4400 - 4050, 3650 - 3200, 2800 - 2600, 1950 - 1400, and 400 - 50 cal yr BP,» the latter of which intervals they associate with the Little Ice Age.
Averaged
over the northern mid-latitudes, future mean
storm track
activity showed little change during the winter, but significant decreases during the summer.
· In the mid - and high - latitudes of the Northern Hemisphere
over the latter half of the twentieth century, it is likely that there has been a 2 to 4 percent increase in the frequency of heavy precipitation events [thunderstorms and large - scale
storm activity].
Storm activity globally has actually lessened
over the past few decades.
Over the past 50 years there has been a strong statistical connection between tropical Atlantic sea surface temperatures and Atlantic hurricane
activity as measured by the Power Dissipation Index (which combines
storm intensity, duration, and frequency).
According to the Intergovernmental Panel on Climate Change, the observed variation in
storm activity and drought shows «no significant trends evident
over the last century» (2).
As an aside, this was the chapter that I believe Chris Landsea was working on before he resigned in a dust up with Kevin Trenbreth
over the politicization (claimed by Landsea against Trenbreth) of the issue of tropical
storm activity and global warming.
Over 75 % of the Northeast short - term extreme precipitation is related to extratropical
storms moving through or near the region, except during September, when more than 50 % of extreme precipitation is related to tropical
storm activity.
The National Weather Service Hurricane Center recently released an update on hurricane Emily indicating that she's having trouble maintaining
activity over the mountains of Hispaniola and may soon be downgraded to a tropical
storm very soon.
«
Storm - related disruptions and rebuilding will affect economic
activity in the near term, but past experience suggests that the
storms are unlikely to materially alter the course of the national economy
over the medium term.