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====Hurricanes and storms====None of the above trends are discussed or even mentioned in the ISPM.
* Increase ====Cyclones (hurricanes and extreme storms)====The ISPM states: "Since 1970, there is some evidence of increased tropical cyclone intensity in both hemispheres, but a decrease in total area affected by drought tropical storm numbers, and no clear global pattern." [ISPM 2.3b] The increase in tropical cyclone intensity is indeed confirmed in AR4, but there is no significant trend in frequency since the 1970s [AR4 3.8.3, FAQ 3.3, Table 3.8]. The ISPM also states: "Data are too sparse, and trends inconsistent, to identify a pattern in extratropical cyclones. [ISPM 2.3c]. However, the AR4 Table 3.8 ascribes "likely" confidence to a finding of "net increase in frequency/intensity and poleward shift in track" for extreme extratropical storms over land in the northern hemisphere since 1950. [AR4 3.8.4 and , 3.5, FAQ 3.3]
SW: →Extreme weather events: Add section on hurricanes/storms
* Increase in high-temperature days/nights over 70% of global land area (1951–2003) [AR4 3.8.2.1]
Other trends cited with "likely" confidence include(but are not limited to):
* Increase in warm spells (heat waves) globally (1951-2003) [AR4 FAQ 3.3]
* Increase in heavy precipitation events in mid-latitudes, disproportionate with changes in mean (1951-2003) [AR4 3.8.2.2]
* Increase in total area affected by drought since the 1970s [AR4 3.3.4 and FAQ 3.3]
==External links==
