Sentences with phrase «cyclone activity low»
Long - term trends: tropical cyclone activity low in recent years, perhaps edging upwards again.
http://planet3.org/ Not exact matches
Since the climate response to the North Atlantic SST anomalies is primarily forced at the low latitudes and the AWP is in the path of or a birthplace for Atlantic tropical cyclones, the influence of the AMO on Atlantic tropical cyclone activity may operate through the mechanism of the AWP - induced atmospheric changes.
A tropical cyclone is the generic term for a non-frontal synoptic scale low - pressure system over tropical or sub-tropical waters with organized convection (i.e. thunderstorm activity) and definite cyclonic surface wind circulation (Holland 1993).
While it is «likely» that anthropogenic influences are behind the changes in cold days and warm days, there is only «medium confidence» that they are behind changes in extreme rainfall events, and «low confidence» in attributing any changes in tropical cyclone activity to greenhouse gas emissions or anything else humanity has done.
The uncertainties in the historical tropical cyclone records, the incomplete understanding of the physical mechanisms linking tropical cyclone metrics to climate change, and the degree of tropical cyclone variability provide only low confidence for the attribution of any detectable changes in tropical cyclone activity to anthropogenic influences.
In looking at the accumulated cyclone energy index, COAPS at Florida State University noted that this was the lowest year for activity in the Northern Hemisphere since 1977, as the Atlantic, western Pacific and Eastern Pacific were all below normal in their activity.
Tropical cyclone activity was low everywhere, except in the Atlantic, where according to NOAA «near - record high hurricane activity» was recorded.
Wang, X. L., Y. Feng, G. P. Compo, V. R. Swail, F. W. Zwiers, R. J. Allan, and P. D. Sardeshmukh, 2012: Trends and low frequency variability of extra-tropical cyclone activity in the ensemble of twentieth century reanalysis.
As the IPCC special report on extreme events put it «There is low confidence in any observed long - term (i.e., 40 years or more) increases in tropical cyclone activity (i.e., intensity, frequency, duration), after accounting for past changes in observing capabilities.»
In 2011, a new study found that «overall global tropical cyclone activity has decreased to historically low levels during the past five years.»
Global tropical cyclone activity is near historic lows, the frequency of major U.S. hurricanes has declined, and big tornados have dramatically declined since the 1970s.
Tied for fourth lowest sea ice extent, in a three - way tie for lowest sea ice volume, the fastest one month sea ice loss for the date, and unusual Arctic cyclone activity affecting the decayed ice of the polar regions, focus just on the lake too trivializes what's happening in a region the size of the Arctic Ocean.
A tropical cyclone is a low pressure system over tropical or sub-tropical waters, with convection (i.e. thunderstorm activity) and winds at low levels, circulating either anti-clockwise (in the northern hemisphere) or clockwise (in the southern hemisphere).
The southern hemisphere tropical cyclone season normally runs from November to April and so far this season activity in the South Pacific Ocean has been relatively low.