maporsche wrote:flaja wrote:maporsche wrote:An increase in extreme weather has nothing to do with our ability to FORECAST extreme weather. Just because we do a bad job at forecasting these storms doesn't mean that the quantity of actual storms is not increasing.
I'm not talking about our ability to make forecasts for extreme weather. I am talking about forecasting the frequency and severity of extreme weather. Global warmongers have tried to issue dire forecasts in this regard, but such forecasts are impossible because we don't know what the frequency of extreme weather has been in the past.
Quote:Has there been a rise in hurricanes in the last 50 years? 100?
We don't know what the frequency of hurricanes was 50 or 100 years ago, so whether or not the frequency has risen since them is impossible to know.
Well, it doesn't look like the number of storms is increasing (at least not predictably).
National Geograpic reported this as fact over 2 years ago (and I doubt they were the first). What the claim is that the INTENSITY of the storms has been increasing with GW.
http://news.nationalgeographic.com/news/2005/08/0804_050804_hurricanewarming.html
http://www.pewclimate.org/hurricanes.cfm#change
"Is global warming changing the intensity or frequency of hurricanes?
"Intensity: According to the 2007 Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC-AR4), it is ?'more likely than not' (better than even odds) that there is a human contribution to the observed trend of hurricane intensification since the 1970s. In the future, ?'it is likely [better than 2 to 1 odds] that future tropical cyclones (typhoons and hurricanes) will become more intense, with larger peak wind speeds and more heavy precipitation associated with ongoing increases of tropical [sea surface temperatures].'
Frequency: According to the IPCC-AR4, on a global scale, ?'[t]here is no clear trend in the annual numbers [i.e. frequency] of tropical cyclones.' As discussed above, however, the frequency of tropical storms has increased dramatically in the North Atlantic. Reasons for this increase are currently subject to intense debate among climate scientists. At least two recent peer-reviewed scientific studies indicate a significant statistical link between the increased frequency and global warming, but research to identify a mechanism explaining this link is ongoing."
"Is global warming generating other types of severe weather?
"Global temperature has increased and precipitation patterns have changed over the 20th century as a result of human-induced global warming, resulting in some increases in extremes of temperature and precipitation. According to the IPCC-AR4, ?'
ncreases in the amount of precipitation are very likely [better than 9 to 1 odds] in high-latitudes, while decreases are likely [better than 2 to 1 odds] in most subtropical land regions,' and ?'t is very likely [at least 9 to 1 odds] that hot extremes, heat waves, and heavy precipitation events will continue to become more frequent.'"