April was the first month for over a year with
above average precipitation in this region, somewhat relieving the generally dry situation.
This is the second four - month period in a row with a significant amount of
above average precipitation.
The latest dynamical model forecasts are calling for well
above average precipitation throughout California during the January - March period, and the recent forecasts from the CFS model have shifted towards a wet December as well.
During summer, most of northern Europe experienced
above average precipitation, as did the Alpine region and the north of Italy and Slovenia, with a number of heavy rainfall events heavily influencing the average for the season and leading to wide - spread flooding events.
For south - eastern Europe the situation was more complex, with below average relative humidity and soil moisture in the whole region, but with some areas having experienced
above average precipitation.
Exceptions were the Norwegian west coast, with much
above average precipitation, and a small band south of the Baltic stretching towards the Black Sea with
above average precipitation, the latter present in both data sets, but more pronounced in E-OBS.
For southeast Europe the situation is more complex, with below average relative humidity and soil moisture in the whole region, but with some areas, such as large parts of the Alpine region and the countries adjacent to the east coast of the Adriatic Sea, having experienced
above average precipitation.
For south - eastern Europe the situation was more complex, with below average relative humidity and soil moisture in the whole region, but with some areas, such as large parts of the Alpine region and the countries adjacent to the east coast of the Adriatic Sea, having experienced
above average precipitation.
March 2018 saw
above average precipitation compared to the 1981 - 2010 average in many parts of Europe.
This is the first four - month period with a significant amount of
above average precipitation since the beginning of 2016.
By the end of the year, that pattern had flipped, with record and near - record temperatures across most of the East and near - to below - average temperatures for much of the West, associated with much needed
above average precipitation across the region.
Not exact matches
Expected La Niña... Potential impacts in the United States include an enhanced chance for below -
average precipitation across much of the South, while
above -
average precipitation is favored for the northern Plains.
However, when runoff - season temperatures were
above average, streamflow was less than expected on the basis of winter
precipitation.
The CONUS
precipitation total for summer was 9.19 inches, 0.87 inch
above average and the 16th wettest on record.
Nationally, the components that measure extremes in warm maximum and minimum temperature and one - day
precipitation totals were much
above average.
The Alaska annual
precipitation total was 40.10 inches, 3.40 inches
above average.
The May
precipitation total for the nation was 4.44 inches, 1.53 inches
above average.
Above -
average precipitation was observed across the Southwest, Southern Plains, Midwest, and Northeast.
Above -
average precipitation fell across eastern parts of the state, but below -
average precipitation across western and central parts of the state resulted in drought expanding during the season.
Regionally, CEI was much
above average in the West and Northwest, due to elevated components of warm maximum and minimum temperatures, spatial extent of drought and days with
precipitation.
The March - May
precipitation total for the contiguous U.S. was 9.40 inches, 1.46 inches
above the 20th century
average.
The summer
precipitation total was 10.87 inches, 0.87 inch
above average, also the 26th wettest on record.
Above -
average precipitation spanned the southern United States.
The November CONUS
precipitation total was 3.35 inches, 1.12 inches
above average and the fourth wettest on record.
Although long - term (60 + months)
precipitation deficits persisted in some locations, some reservoirs returned to
above -
average levels after being record and near - record low for the past several years.
Above -
average summer
precipitation was observed across the Southwest, Midwest, and Northeast.
The autumn
precipitation total was 15.76 inches, 3.41 inches
above average, the sixth wettest on record.
Above -
average precipitation was observed in the Southern Plains and Lower Mississippi Valley.
Above -
average precipitation was observed across the central U.S. with six states in the Central and Southern Plains and Lower Mississippi Valley being wetter than
average.
In contrast, La Niña episodes typically result in below -
average temperatures,
above -
average precipitation, and
above -
average snowpack.
The CONUS autumn
precipitation total was 8.38 inches, 1.50 inches
above average, ranking as the 15th wettest and wettest since 2009.
Elements that contributed to the
above -
average seasonal USCE were warm maximum and minimum temperatures, particularly in the West, and one - day
precipitation totals.
Above -
average November
precipitation was observed across much of the Great Plains, Midwest, and Southeast.
The Arkansas
precipitation total was 10.65 inches, 6.36 inches
above average.
The Missouri
precipitation total was 7.86 inches, 4.95 inches
above average.
Rain is very scarce during this month, with total
precipitation barely reaching 3 mm due to minor sprinkles
above the islands that last for only 3 days of the month on
average.
«During November 2011 - January 2012, there is an increased chance of
above -
average temperatures across the south - central U.S. with the odds favoring below -
average temperatures over the north - central U.S.. Also,
above -
average precipitation is favored across the northern tier of states, excluding New England, and drier - than -
average conditions are more probable across the southern tier of the U.S. (see 3 - month seasonal outlook released on 20 October 2011).»
At the end of February, seasonal
precipitation for the 2008 Water Year, which began on October 1, 2007, was well
above average over much of the West.
Second Assessment of Climate Change for the Baltic Sea Basin https://books.google.com/books?isbn=3319160060 The BACC II Author Team
averaged frequency of extreme 1 - day
precipitation totals
above 15 mm and a... 4.6 Cloudiness and Solar Radiation 4.6.1 Cloudiness Records of cloudiness and solar... There is a trend of decreasing cloud cover over the Baltic Sea basin......
This is not reflected in the 30 year study since the 70's and 80's were a bit
above average re:
precipitation.
Above -
average precipitation in California and other parts of the West doesn't necessarily mean there will be fewer wildfires this season — the Golden State has already seen more than twice as many acres burned as it did last year.
Above -
average precipitation was observed in the Southern Rockies.
Since 1991, the amount of rain falling in very heavy
precipitation events has been significantly
above average.
With this in mind, and given how difficult it can be to dislodge deeply - entrenched ridging such as is currently being observed, I estimate that there is an
above average probability that total
precipitation for water year 2013 - 2014 will be below normal once again.
This year California broke records, as it saw incredible rates of
precipitation — so far in 2017, the state has gotten an
average 22.45 inches of
precipitation, 9.5 inches
above the 20th century
average.
We estimated runoff in periods with below -
average precipitation, herein referred to as droughts, and in periods with
above -
average precipitation, herein referred to as pluvials, using a model of 20th century
precipitation in ponderosa pine forests in the region [25].
In simulated droughts, 1 out of 3 years had
above -
average precipitation, and these years accounted for 75 % of the runoff gains in these scenarios.
Even if they do receive
above -
average precipitation, it will most likely not be enough.
During this period, south - western South America experienced
above average soil moisture and also, in many parts,
above -
average precipitation and surface air relative humidity.
Most of southern Europe saw much
above precipitation, in particular in the countries adjacent to the Adriatic Sea, where the relative humidity of surface air was also
above average.