Sentences with phrase «when precipitation»

This can happen when precipitation falls and freezes onto the cold pavement or a melt and freeze occurs.

Steve Ghan, from the Pacific Northwest National Laboratory, says, «This work confirms what previous cloud modelling studies had suggested: that although clouds are influenced by many factors, increasing aerosols enhances the variability of precipitation, suppressing it when precipitation is light and intensifying it when it is strong.

Stormwater runoff is generated when precipitation from rain and snow hits impervious surfaces such as roads, rooftops, or parking lots and is not absorbed into the ground.

This is an important capability for predicting summer temperatures because observed daily temperatures are usually higher on rainless days and when precipitation falls less frequently than normal.

In extreme seasons — when precipitation falls infrequently — July and August daily high temperatures could average between 100 and 110 degrees Fahrenheit in cities such as Chicago, Washington, and Atlanta.

Second, I agree — when precipitation occurs, mass is removed.

A similar situation occurred in mid-1950s when precipitation reached its minimum within the instrumental records.

A team of Berkeley Lab researchers has performed molecular level analysis of desert biological soil crusts — living ground cover formed by microbial communities — to reveal how long - dormant cyanobacteria become activated by rainfall then resume dormancy when the precipitation stops.

In our simulations, when precipitation fell below average, the trees quickly shed foliage to adapt to the drier conditions, and tree vigor was negatively affected by the sudden drop in leaf area as indicated by the decrease in the following year's GE (ratio of change in the change in LAI to stem diameter).

Although the state has benefited from several large storms over the past four years, they have often come early in the winter season — a time when precipitation is generally not heavy — and then the storms stopped arriving completely.

Even in the fall months, when precipitation tended to increase in most of the region, the extent of drought increased by 9 percent.»

One of them is the future road salt use index, which is related to days when precipitation occurs and the minimum temperature is below 2ºC.

The latent heat is released, which is why temperatures usually rise when precipitation occurs.

Cold can be deadly to an outdoor animal, particularly when precipitation and moisture are involved.

It turns on the wipers when precipitation reaches the windshield and automatically adjusts the high beams of the headlamps.

When precipitation was changed from snow to rain, the stream system became «flashier,» the team writes, with the water that would have been stored as snow running off into the stream faster.

Black ice on roads, which takes on the color of the pavement below it, forms when precipitation freezes on impact or melted runoff refreezes.

Under the model they developed, the scientists say the likelihood of Bd occurrence is predicted to decrease during warmer periods, and when precipitation exceeds an annual rainfall threshold above 1,800 mm per year.

These have not worked as well as expected, though, especially during typhoons when precipitation spikes, so groundwater continues to be contaminated.

Not exact matches

Precipitation occurs when water vapor condenses and is released from the clouds.

Prather, a 49 - year - old professor at the University of California, San Diego, is one of a growing number of scientists who suspect this largely unexplored microbial ecosystem might hold the answer to one of the great mysteries of the weather: Why do clouds produce precipitation when they do?

(When tropical precipitation is more intense, the raindrops include more of the lighter form of hydrogen.)

Apparently, winter precipitation was more important than summer temperature for annual glacier balance when only considering subsets of years with high NAO index and negative AMO index.

Variations in the thickness of the layers is determined by a combination of the amount of water seeping into the cave and the concentration of carbon dioxide in the cave's atmosphere so, when conditions are right, they can provide a measure of how the amount of precipitation above the cave varies over time.

When bringing home food trumps singing The scientists then compared the birds» mating habits to temperature and precipitation records near the nesting areas.

However, when runoff - season temperatures were above average, streamflow was less than expected on the basis of winter precipitation.

There are inherent dangers when it comes to tampering with natural processes, however, and Prather said that what could be seeded into a cloud one day to increase precipitation could fall down to the ground later as a pollutant.

But if scientists are able to gain a deeper understanding of which dust particles best form ice and which don't, they may be able to maximize precipitation when clouds do form and stave off future droughts like the one that has beset California recently (ClimateWire, Aug. 4).

«It's similar to what the Weather Channel does when they show heavy versus light precipitation on a map using color,» Worley says.

Precipitation was very important in the summer and the winter, when rains and melting snow boosted runoff and delivered nitrogen and phosphorus, which algae use as food sources, to the lake.

Wahl published a paper in Nature Communications in 2015 on the effects of compound flooding, which is when increased river discharge, precipitation and storm surges happen at the same time.

Both the timing and quantity of precipitation matter, as does the type of soil and whether it's dry or already waterlogged when rain hits.

This likely happened when volcano - spewed sulfur dioxide wafted high into the atmosphere, scattering sunlight back into space and briefly lowering global temperature and changing precipitation patterns, among other effects.

«Long term, our goal is to be able to predict how much precipitation we can expect to form when certain aerosols such as dust are coming toward us,» says Prather.

They were in less agreement about how intense rain or snow will be when it does fall, although there is general consensus among models that the most extreme precipitation will become more frequent.

When the answer to that question is no, then the greenhouse gases are implicated as the culprit in changing how precipitation is falling worldwide.

The study found cooler sea temperatures, greater precipitation and stronger upwelling — all indicators of La Niña - like conditions at the study site in Panama — during a period when coral reef accretion stopped in this region around 4,100 years ago.

Still Hopes that El Niño would fill reservoirs crumbled when predicted precipitation didn't reach the West.

Recent models indicate that the rain comes in twoforms: a constant, light drizzle over most of the surface, adding up totwo inches or so of precipitation per year, and occasional cloudburststhat carve out river channels and fill the lakes, only to evaporateagain when temperatures rise.

When temperature and precipitation patterns shift, the organisms hit hardest are the ones with the deepest roots.

Rainfall levels in this region closely correspond with the strength of the oscillation index in winter, with higher precipitation when it is positive.

Blueberries are thought to have formed by the precipitation of iron - bearing minerals when groundwater rose up through layers of sediment.

Computer models showed a reduction in what Edwards called «extreme precipitation events» in the fall season in western South Dakota when compared to climate conditions in the 1800s.

When nitrogen isotopes change in response to variation in winter precipitation over the past 2,000 years, this signature is transferred from the soil to plant leaves to insect to bat and ultimately guano.

It is based on the misconception that the factor preferring isotopes is at the «precipitation / freeze» end of the process when it is actually at the evaporation end, i.e. not dependent on local conditions on the ice sheet.

cloud seeding A technique for artificially encouraging clouds to release precipitation (rain or snow) when it's needed.

When those nucleated droplets get heavy enough, they fall out as precipitation.

The computer looked at when extreme heat and precipitation occurred during each climate period.

«Atmospheric rivers can bring record - setting precipitation when making landfall in western North America.

When heated by the distant sun, the materials are converted directly into vapors, which then fall back to the dwarf planet in the form of precipitation.