Sentences with phrase «winter precipitation trends»

Not exact matches

«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.

Recent Forest Service studies on high - elevation climate trends in the Pacific Northwest United States show that streamflow declines tie directly to decreases and changes in winter winds that bring precipitation across the region.

In virtually all states with stations below 2,000 feet, the data show a trend toward a higher percentage of rain during the winter precipitation season.

A Climate Central report found that at least 58 percent of more than 2,000 weather stations reported a trend toward a smaller percentage of all winter precipitation falling as rain instead of snow, with the Northwest and Upper Midwest registering the largest decreases.

However, there has been a general trend of decreasing winter precipitation from 1950 to present; this pattern is most evident in the northwest and central portions of the state and may be due to increased frequency of El Niño events (see Climate chapter).

Given that the long - term trend in early spring snowpack is down, Climate Central recently examined how the type of precipitation is changing during the winter months nationwide.

The very increase in absolute humidity that reinforced the warming trend through infrared absorption might lead to increased cloudiness (or indeed to increased precipitation and winter snow cover) and thus, through reflection of insolation, to a considerable buffering of the warming trend.

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.

An examination of hydro - climatic trends in the Salt - Verde watersheds revealed that temperatures are non-stationary, increasing significantly in recent decades, but the same is not true for winter precipitation or resulting stream flows [55].

Future 30 - year trends (2016 — 2045) in winter (a, b) SAT (°C per 30 years; color shading) and (c, d) precipitation (mm day − 1 per 30 years; color shading) from simulations 13 and 25 of the CESM1 Large Ensemble, chosen for their contrasting SLP trends (contours; interval = 1 hPa per 30 years with negative values dashed)

This study highlights the expected range of projected winter air temperature and precipitation trends over the next 30 — 50 years due to unpredictable fluctuations of the North Atlantic Oscillation (NAO) superimposed upon forced anthropogenic climate change.

Percent chance of a positive 30 - year trend (2016 — 2045) in winter (a) SAT and (b) precipitation from the CESM1 Large Ensemble.

a Ensemble - mean of scaled - interannual regressions of winter SLP (contours) and SAT (color shading) anomalies upon the normalized leading PC of winter SLP anomalies during 1920 — 2012; b SLP and SAT trend regressions upon the normalized leading PC of winter SLP 30 - year trends based on 2016 — 2045; c as in (a) but for precipitation in place of SAT; d as in (b) but for precipitation in place of SAT.

This study has highlighted the role of internal variability of the NAO, the leading mode of atmospheric circulation variability over the Atlantic / European sector, on winter (December - March) surface air temperature (SAT) and precipitation (P) trends over the next 30 years (and the next 50 years: see Supplemental Materials) using a new 40 - member ensemble of climate change simulations with CESM1.

1) Connection to global warming The model simulates an increase in Northern England precipitation in winter, but the trend is not as large as the observed one.

The model simulates an increase in Northern England precipitation in winter, but the trend is not as large as the observed one.

«The recent trends in winter precipitation have been accompanied by respective trends in sunshine (significant increase in all subregions of 17 to 29 %)»

He said severe effects of climate change on water resources could be seen in shape of changes in precipitation, drastic increasing trends in temperature, hazardous alteration in period of winter and summer, harmful rising in the sea level and depletion of groundwater.

Winter precipitation (mean and extreme) variability and trends along the south coast and interior of Alaska appear to be closely related to variations in the PNA pattern over this timeframe, while El Nino / Southern Oscillation (ENSO) influences, through the Nino3 index, appear to be significant along the south coast alone.