Sentences with phrase «less precipitation during»

Some of this is characteristic of La Niña... as the southern tier of the United States sees less precipitation during La Niña winters.»

In fact, calendar year 2013 now appears to be the driest on record to date — specifically, California has received less precipitation during the period January 1, 2013 — November 13, 2013 than during any other January 1 — November 13 period in at least the past 119 years.

Not exact matches

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.

Nor is anyone informed that during an earlier cool phase of the Pacific Decadal Oscillation, the droughts of the 1950s brought even less precipitation to the region, yet there was still greater river flow and less damage to the bay's fisheries.

Importantly, the changes in cereal yield projected for the 2020s and 2080s are driven by GHG - induced climate change and likely do not fully capture interannual precipitation variability which can result in large yield reductions during dry periods, as the IPCC (Christensen et al., 2007) states: ``... there is less confidence in the ability of the AOGCMs (atmosphere - ocean general circulation models) to generate interannual variability in the SSTs (sea surface temperatures) of the type known to affect African rainfall, as evidenced by the fact that very few AOGCMs produce droughts comparable in magnitude to the Sahel droughts of the 1970s and 1980s.»

Proxy records that document summer precipitation are much less common and, of those that do exist, some suggest wetter summers during the medieval period (22, 45 — 47), whereas others indicate decadal variability of both drought and wetness (48).

It should also be possible to get less snow with the same amount of precipitation if e.g. the day - night variation increases, in that snow melts during the heat of the day and even if the cold of the night averages out the temperature, the added cold can not remake the lost snow.

For example, the western US was much wetter during the last glacial than it is today: http://esp.cr.usgs.gov/info/mojave/paleoenviron.html but there is no evidence that total global precipitation was any less than we see today.

Mixed - Humid - A mixed - humid and warm - humid climate is defined as a region that receives more than 20 inches of annual precipitation with approximately 4,500 cooling degree days (50 °F basis) or greater and less than approximately 6,300 cooling degree days (50 °F basis) and less than approximately 5,400 heating degree days (65 °F basis) and where the average monthly outdoor temperature drops below 45 °F during the winter months.

A warm - dry and mixed - dry climate is defined as a region that receives less than 20 inches of annual precipitation with approximately 4,500 cooling degree days (50 °F basis) or greater and less than approximately 6,300 cooling degree days (50 °F basis) and less than approximately 5,400 heating degree days (65 °F basis) and where the average monthly outdoor temperature drops below 45 °F during the winter months.