Sentences with phrase «precipitation trends since»

To assess Montana's historical climate, we evaluated temperature and precipitation trends since the mid-20th century by using standard statistical methods to analyze records of temperature and precipitation.

Not exact matches

Extreme rainfall events are trending upward, and nine of the top 10 years for extreme one - day precipitation events have happened since 1990.

«The winter discharge of the Tanana River has increased since the record keeping began in the»70s, but there are no increasing trends in precipitation,» she said.

«According to climate predictions, annual precipitation is likely to decrease in the Southwest but increase in the eastern United States during the 21st century, therefore, the observed diverse trends of surface water body areas since 1984 could continue to occur in the future,» said Xiao.

Precipitation has generally increased over land north of 30 ° N over the period 1900 to 2005 but downward trends dominate the tropics since the 1970s.

Seasonal decreases in land precipitation since the 1950s are the main cause for some of the drying trends, although large surface warming during the last two to three decades has also likely contributed to the drying.

-- Along with analyzing historical trends in temperature and precipitation, we performed an analysis of changes in extreme climate events since the middle of last century.

However, combined measuring stations around the world suggest there has been a global trend towards more frequent and intense hot extremes since the 1950s, as well as more heavy precipitation events.

Our state level analyses of extreme precipitation events shows a strong increasing trend since the 1950s, with 40 of 48 states showing at least some increasing incidence.

For the entire Northern Hemisphere, there is evidence of an increase in both storm frequency and intensity during the cold season since 1950,1 with storm tracks having shifted slightly towards the poles.2, 3 Extremely heavy snowstorms increased in number during the last century in northern and eastern parts of the United States, but have been less frequent since 2000.11,15 Total seasonal snowfall has generally decreased in southern and some western areas, 16 increased in the northern Great Plains and Great Lakes region, 16,17 and not changed in other areas, such as the Sierra Nevada, although snow is melting earlier in the year and more precipitation is falling as rain versus snow.18 Very snowy winters have generally been decreasing in frequency in most regions over the last 10 to 20 years, although the Northeast has been seeing a normal number of such winters.19 Heavier - than - normal snowfalls recently observed in the Midwest and Northeast U.S. in some years, with little snow in other years, are consistent with indications of increased blocking (a large scale pressure pattern with little or no movement) of the wintertime circulation of the Northern Hemisphere.5 However, conclusions about trends in blocking have been found to depend on the method of analysis, 6 so the assessment and attribution of trends in blocking remains an active research area.

The atmospheric warming is the factor that can best explain this consistency, up to ~ 0.7 °C since 1950 and more marked since 1976, while the trend in precipitation is much less homogeneous over this area and is affected by a significant decadal variability.

Seasonal decreases in land precipitation since the 1950s are the main cause for some of the drying trends, although large surface warming during the last two to three decades has also likely contributed to the drying.

Hoerling: «We can also say with high confidence that no appreciable trend toward either wetter or drier conditions has been observed for statewide average precipitation since 1895» — «At present, the scientific evidence does not support an argument that the drought there is appreciably linked to human - induced climate change... In short, the drought gripping California has been observed before.

A study by the Climate Service Center Germany (GERICS) discovered, according to Phys.org, that «precipitation in Germany has increased by 11 percent since 1881 — and according to the forecasts, this trend is set to continue.

We find that the reported discrepancy can be traced to two main issues: (1) unforced internal climate variability strongly affects local wetness and dryness trends and can obscure underlying agreement with WWDD, and (2) dry land regions are not constrained to become drier by enhanced moisture divergence since evaporation can not exceed precipitation over multiannual time scales.

It is noteworthy that there do seem to have been more severe precipitation events since the global temperature trend started to turn downwards recently but I still see suggestions from committed alarmists that that is a consequence of warming rather than cooling.

However, since climate models are better able to capture broad patterns of middle atmospheric pressure (which are strongly linked to precipitation) than precipitation itself, it's likely that we can still say something meaningful about trends in large - scale atmospheric patterns conducive to low precipitation (and, therefore, drought).