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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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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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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201 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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55 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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94 views

How to calculate hourly rainfall projections?

If the National Weather Service website shows increasing probability of precipitation (POP) over a 6 hour period (e.g. 10% rising gradually to 60%), what is the POP in this time interval if the ...
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2k views

Why do some places have rain frequently? [closed]

There are some places on Earth which holds the record of being "The wettest place on Earth". On what factors these places differ from other normal places? An example of wettest place on Earth is ...
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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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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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151 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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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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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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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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215 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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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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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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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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334 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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Creating a drought metric using precipitation data?

I'm currently working on a project in which I need to create a metric to quantify drought. For the state of Pennsylvania, I have daily precipitation data from many NOAA precipitation gauges (inches of ...
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How to interpret precipitation probability?

Below is the Dallas precipitation forecast I just got (requested from Google at 10am, Nov 29, 2019). From this, what is the probability that a 10cm (diameter) cup placed in a Dallas park from 4:00pm ...
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Possibility to influence oceanic evaporation to protect Sahel/Sahara [closed]

When reading about the projects that want to plant trees on the Sahel-Sahara border, for protection of the Sahel, I wonder what other possibilities there are. Like, would it be possible to influence ...
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Is there an index that evaluate how even temporal rainfall distribution is?

Like some biodiversity indices that account for species evenness (whether it is dominated by a few species), I am wondering do meteorologists use an index to describe how even a temporal rainfall ...
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67 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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369 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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218 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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126 views

Are weather changes periodic? (Do the same weather patterns repeat over years?) (Cycles) (Journal paper suggestion)

I am wondering if there is long term (10 year, 7 year, 20 year) periodic patterns Similar to short term seasonal and periodic patterns in weather such as sea/land wind, monsoon, ENSO, ocean sea-saw, ...
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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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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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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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246 views

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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591 views

How to perform precipitation data analysis? [closed]

I want to make precipitation data analysis for the Latvian territory. I only have meteorological stations and reanalysis data. My data from meteorological stations are in the format: ...
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1answer
367 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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319 views

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: ...
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91 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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How to infer local precipitation from reanalysis data?

Let's say I'm extracting precipitation from a single pixel or region from a reanalysis (MERRA-2, ERA-5, Interim) dataset. I can infer a distribution for the daily data (Gamma, Pearson-III, e.g. link),...
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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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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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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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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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71 views

Precipitation and Elevation

Does precipitation increase or decrease as elevation increases? Because I heard that in the mountains they get more precipitation due to the orographic effect and how the mountains drain the moisture ...
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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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246 views

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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53 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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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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Gamma vs Pearson distribution for Standardized Precipitation Index

What is the difference between Pearson and Gamma distribution and the impact of using one of these in the Standardized Precipitation Index (SPI)? Thank you!
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How can I describe this data using a graph?

I want to know how I can put all this data into one graph. I thought that temperature can be graphed as a bar graph and precipitation could be used with a line graph. However I don't know how i can ...
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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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