Questions tagged [precipitation]

Precipitation is any form of moisture that falls from a cloud and reaches the ground. Precipitation can fall to the ground as rain, snow, sleet, hail, graupel... etc.

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25 views

Do less trees equal less rain? [duplicate]

It is said the the Sahara desert was once a dense forest until it was cut. Do trees contribute to precipitation and less trees equal less rain locally?
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Can I interpolate rainfall data from stations outside of watershed for the watershed?

I have only few station inside the watershed so I want to use the stations outside if I can to get better results
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Is there a way to approximate the density of air during rain?

Given a rate of precipitation (in mm^3/hour), and average droplet diameter, is is it possible to calculate (or even ballpark) the density of the air+rain droplets at time of rainfall? What I mean is, ...
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Does tropical rain forest as defined by the Holdridge Life Zone classification exist in any meaningful prevalence?

I've been recently introduced to the Holdridge life zones and their method of classification, and have been somewhat concerned/confused by the definitions of tropical rain forest as described by the ...
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Flood and Statistics

A recent flood was due to combined effect of rainfall(precipitation) and reservoir storage. I have daily rainfall data and reservoir storage data. How can I correlate these two to get a statistical ...
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Rainfall Frequency Analyses

I have monthly precipitation data and would like to create the frequency curve for the 2, 5, 10, 100 year storms. I have access to NetStorm, STORMS 2000, CFA (from Environment Canada) and HEC-SSP. ...
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Model impact of atmopsheric circulation changes on precipitation dD of a region

I'm looking to model the impact of broad scale atmospheric circulation changes on the hydrogen isotope ratio of precipitation for a given region. As an example, what impact does a high pressure system ...
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43 views

Artefacts in PERSIANN-CCS data

I downloaded PERSIANN-CCS for the region of Pawlowdar, Kazakhstan and this has stripes all over my downloaded data. For another AOI in Kazakhstan I do not have this problem. Does anyone of you have ...
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131 views

Circular rain cloud observed in rain radar

This circular rain pattern was observed in Sydney’s rain radar today. It remained for the entire loop, wiggling around a bit but mostly staying in the same place. The fact that it’s centred around ...
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How can I convert a CERA-20C total precipitation dataset of "monthly means of daily means' (edmo) to mm/month?

I downloaded an edmo dataset of 1 ensemble of the cera-20c model. I want to convert these data, which are in [m], to mm/month. Further specifications: 0.125/0.125 grid, -29/30/-30/31 area. Example of ...
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Computation of absolute precipitation forecast from precipitation anomaly forecast in NOAA CFSv2

I am currently trying to use absolute precipitation forecasts for medium term range (3wk-2mth). As no models of NOAA have absolute precipitation on this timerange, my idea was to compute those ...
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127 views

How is heavy rainfall determined in National Climate Assessment

I'm trying to understand/reproduce/revise this chart in the Southeast section of the United States National Climate Assessment. The truncated scale for the bars is what caught by eye as a classic ...
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Projecting rectangular stereography centred on 42°N, 10°E

I am reposting from GIS Stack Exchange as here might also be someone who might help: I have a precipitation GRIB2 file obtained at EUMETSAT H-SAF I am able to decode it to ascii but the software I am ...
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55 views

Why are climate anomalies calculated relative to 1981-2010 average?

What is the purpose for doing this? Is it inaccurate to calculate anomalies for variables such as sea surface temperature and precipitation based on a different time period?
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Statistical dependence of mean annual soil evaporation and mean annual precipitation globally

I am studying a simple dynamical system that represents a plant and water system, similar to Klausmeier. In Klausmeier model the mean annual precipitation and the soil evaporation are introduced as ...
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1answer
63 views

what is the best way to detect spatial and temporal pattern of precipitation in mountainous region?

The study area rang from 500 to 8000 m above ground and distributed into 4 elevation classes, above 5000,4-5000, 3-4000, below 3000 m above ground. This region has different climate zone/precipitation ...
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Precipitation Totals past days online?

I am looking for a website that can I look for to check and see the precipitation totals for past days.. I go to this site : https://www.cocorahs.org/ . It lacks in some areas where I live in the ...
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monthly temperatue by state

I am trying to find out monthly average temperature and average rainfall for states of USA from 2015 to 2017. To my surprise I am not able to find it anywhere. Please help. I could find this link - ...
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155 views

Is there a maximum size for a single snowflake?

Just based on my previous experiences a wetter snow, in general, has larger flakes. Some online sources say that raindrops do have a maximum size before they start to break apart when surface tension ...
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How to calculate the snow cover area from satellite data in better and efficient way?

Satellite retrievals contain cloud cover, biases e.t.c which is the main challenge to prepare the data for further analysis. After all, how we can efficiently calculate the snow cover and its ...
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Is there less precipitation (rain/snow) in cold weather than in warm weather?

To me it seems that there is a lot less precipitation when temperatures go below -5°C (23°F). Is there any evidence for that? Could this be a local phenomenon (I live in Germany)? What could be the ...
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1answer
291 views

Does the snow come from local moisture or transported moisture?

Currently there is a snow storm coming from Europe over the UK. This is drastically dropping the temperature and making it snow lots. Is the snow coming from moisture that has been brought over from ...
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159 views

How does temperature impact the elevation distribution of orographic precipitation?

Consider the case of two weather systems of different temperatures hitting the Andes Mountains from the west: After traveling a long distance over the Pacific ocean I would expect the air in both ...
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How can snow be falling with consistent above freezing temperatures? [duplicate]

I'm a keen skier, and I've often been happily surprised by snow fall despite temperatures of 1 or even 2 °C. After some research I found that the explanation relies in assuming that these above ...
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Confusion with precipitation values in CORDEX MPI-ESM rcp data

I want to analyze climate projection data for the different RCPs for a region in north western India, which has an arid climate. I chose MPI-ESM data downscaled with CORDEX. An example filename looks ...
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How much rain falls on the Earth each year?

In this resource, it says that the average amount of precipitation falling on the Earth per year is approximately 100 cm. Integrated across the surface of the Earth, that yields approximately 5.1 × ...
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How can I figure out the time it will take different clay and silt particles to precipitate out of water

I'm attempting to water some crops on my small plot of land using water from a downhill creek. I want to pump the water uphill to a tank then use gravity fed drip irrigation. Sometimes ( usually after ...
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Dissolved minerals

I have a question that I am confused about. If a mineral (say limestone) was added to a groundwater system, say like an aquifer and is completely dissolved in solution, can it ever be a solid again ...
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Does a hurricane classification exists where estimated rainfall is taken into account?

Hurricanes are classified with the Saffir–Simpson hurricane wind scale. However an extreme amount of rainfall can cause a disaster although the windspeeds are not extreme. Is there some sort of ...
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304 views

Area reduction factor reference for precipitation

For a large catchment (>1000ha) I'm looking for some method to use a area reduction factor to adapt precipitation values. I have a large dataset of daily precipitation values but I have to use some ...
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200 views

How are daily precipitation totals computed?

I would like to use ASOS data from Iowa State University to compute daily rainfall totals for specific locations. Using ASOS, I am unable to match the official NWS totals. I am assuming that the ...
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226 views

Timeline of Himalayas/Tibetan plateau formation

Note: edited based on helpful comments. In Walking with Cavemen, Robert Winston claims an African rainforest existed 8 mya, but by 4 mya it was gone. He attributes this to newly Himalayas-triggered ...
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To what degree do large lakes influence precipitation levels compared to the ocean?

I was wondering what percentage of precipitation could be estimated to have been contributed by large lakes such as the Great Lakes or Lake Baikal in the immediate vicinity of said lakes (say, within ...
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Is there any place on Earth that is permanently a desert?

I am interested to know if there is any place on Earth that is permanently a desert (except Antarctica). By permanent I do not mean to be the physical meaning of forever. It means the place has to be ...
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1k views

How to interpret the values of moisture flux convergence?

I have a time series of moisture flux convergence. The values show positive and negative. What are these positive and negative values say? Can somebody help me how to interpret it? How it is related ...
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171 views

Need help understanding rain rate formulas from drop sizes

I have come across different formulas by which the rain rate [mm/s] or [mm/h] can be computed from the drop size distribution. I'm somehow unable to convert the different formulas into each other. It ...
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Causes and concentration of red rain of Kerala

The red rain phenomenon in Kerala, India has been reported several times in history (1896, 2001, 2012). The color of the rain seems to be associated with the presence of airborne spores of the algae ...
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What is the difference between Precipitable Water (PW or PWAT) and Quantitive Precipitation Forecast (QPF) in terms of computer weather model data?

When I take a look at weather models, there is an option to take a look at PWAT or QPF. What's the difference?
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SPI (Standardized Precipitation Index) for 40 years seasonal mean

I am working with SPI (Standardized Precipitation Index) and in particular I am interested in obtaining the seasonal mean observation over a period of 40 years. The meteorological season I am ...
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82 views

Wind speed, precipitation, extreme daily precipitation

I am trying to figure out what type of precipitation lifting mechanism occurs in a area that is unknown but I know some facts about the climate. So I know that there are 4 precipitation lifting ...
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Digitalizing precipitation data from the image of weather map

I have a set of very old precipitation anomaly maps, from 1995-2006 for Brazil. The data of these maps, is to the best of my knowlegde, lost. I would like to have them digitalized, ie, to NetCDF or ...
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How does elevation affect the amount of rainfall received?

How does elevation affect the amount of rainfall received? Does elevation affect precipitation?
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Does the amount of rainfall relate to temperatures of a place?

Does the amount of rainfall relate to temperatures of a place? Is the amount of rainfall related to the maximum mean temperature of a place?
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Why is Egypt so dry?

If you look at this wind map (for July, but following the link you can also view other months): you will see that Egypt gets its air from the Mediterranean sea. During other months it could get less ...
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132 views

Recharge calculation for an aquifer

I want to calculate recharge for an aquifer for which I have calculated daily ET by Haude's method and I also have daily precipitation data. How can I calculate recharge per minutes.
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How to Compute Visibility [duplicate]

I have the following data about a region, and would like to compute the visibility for that region, i.e. the distance that a person could see ahead of them. I have: precipitation (mm/day) dewpoint(...
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170 views

Difference between convergent precipitation and cyclone precipitation?

What exactly is the difference between convergent precipitation and cyclone precipitation, their generation and characteristics?
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52 views

Is there a data source for annual global precipitation?

Is there a data source for cumultative global precipitation by year? Units would presumably be mass, volume, or height of water equivalent. Also, what about cumulative global precipitation over land ...
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295 views

Does cloud fraction of 0 for low clouds means it was raining?

What information does cloud fraction provide about weather on a certain day? Do low-level (1000-700 hPa) cloud fraction, optical thickness of all clouds and total cloud fraction provide any ...
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How can we predict if it's raining, drizzling or there is snow fall by using precipitation intensity (inches/hour)?

I was analyzing a dataset in which precipitation intensity(inches/hr) and the type of precipitation was given. For example: ...