Questions tagged [rainfall]

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4
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0answers
69 views

How common are volcanic-induced rain events?

Last year I did an online summer course on remote sensing of volcanoes held by the University of Hawaii at Hilo. During the course, we had a presentation about the monitoring campaign during the 2018 ...
4
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3answers
94 views

Does global warming inhibit transport of moisture?

This northern summer, 2021, there were wildfires in Southern Europe and floods in Germany nearly at same time, also, floods and wildfires in different parts of Turkey, and floods in Far East of Russia ...
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0answers
62 views

Why is equatorial Africa wetter in the west than the east? [duplicate]

Looking at equatorial Africa in Google Maps, the western part – Guinea, the Congo – is the dark green of tropical rain forest that I would expect of a wet equatorial region, by analogy with the Amazon ...
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0answers
41 views

Are terms like "Extremely Torrential Rain" (>500 mm/24 hours) universal in meteorology?

Meteorological phenomenon can span large ranges in size and strength and categorizations exist based on thresholds, One example is the Saffir–Simpson hurricane wind scale (SSHWS) (see also NOAA) ...
16
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8answers
5k views

Ways to make a "How hard is it raining?" detector for personal use?

Is there a consensus on the "heaviness" of rain? and Relationship between Probability of Precipitation and Predicted Amount of Rain remind me of a gedankenexperiment of mine. I like to ...
3
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1answer
74 views

Relationship between Probability of Precipitation and Predicted Amount of Rain [duplicate]

If a popular website provides an hourly forecast, and it states at 12:00pm there will be a 20% chance of precipitation and 2.5 mm of rain... What does the "2.5 mm of rain" mean? (A) ... If ...
3
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2answers
158 views

Is there a consensus on the "heaviness" of rain?

As part of the home dashboard I am developing, I get information about incoming rain. It is given in mm/min. Is there a consensus on the precipitation rate that is called "light rain", or &...
4
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3answers
183 views

Why are rain weather predictions (apparently) so unreliable still in the year 2021?

A year or so ago, I finally implemented a little mechanism which, every five minutes, fetches weather data from SMHI (Swedish official organization, having kept track of temperatures and stuff since ...
3
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2answers
42 views

Find optimum number and location of rain gauges

Is there any recommended method for finding the optimum number and location of rain gauges over a region based on the data from existing rain gauges. There is one Isohyetal method that does not give ...
0
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0answers
30 views

How to calculate change in volume of a container using rainfall data

I have 2 data. A container data, 3 containers(A1,A2 and A3) all are the same height, but each have varying water volume, the table consist of change of water volume (hourly) for the weeks 1 and 2. .. ...
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0answers
43 views

How to define high frequency rainfall?

I have a rainfall data set from a weather station where the data was collected at 20 minutes intervals for 10 years. I would like to peak up the high frequency rainfall cases. What are such rainfalls? ...
2
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2answers
120 views

Calculating Stream Flow from Rainfall Data

I have been given the following data: Month N T (degrees C) Monthly Rainfall (mm) 1 0.68 1.12 391.1 2 0.82 1.40 163.1 3 0.98 3.04 296.5 4 1.15 4.77 157.7 The list goes on. From this and using ...
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2answers
76 views

Relationship between rainwater and solar radiation

I am an enthusiast in this area and reading some scientific articles on precipitation forecasting and solar irradiation, I was wondering if these two variables have any direct correlation or ...
4
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0answers
77 views

Free historical weather data API

Where can I find a free Python API that provides historical weather data (temperature, rainfall)? I'd need data of an Italian city, at least with hourly granularity.
0
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1answer
130 views

Tipping bucket rain gauge measurement, normalizing

I have bought this cheap rain gauge (only the rain gauge, not the other parts) for measuring rainfall with a Raspberry Pi. It works as far as I can tell, every bucket swing will result in an interrupt ...
0
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1answer
144 views

Can they still not predict rain even one week in advance?

Every ten minutes, I make an API call to the SMHI's API with the GPS coordinates less than 1 km from here (which cannot possibly matter for accuracy, but does for privacy). SMHI is the Swedish weather ...
0
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1answer
287 views

Rainfall units conversion from depth to rate/intensity

Given 6-hour rainfal data with units in meters(m), how can one convert the 6-hourly rainfall depth in meters(m) to ...
2
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1answer
201 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, ...
2
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1answer
42 views

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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0answers
33 views

How to choose "relevant" precipitation durations for flash flood modelling?

For my thesis, I model flash floods in urban areas. A book with recommended practices says to use events with a recurrence interval of 30 and 50 years. Regarding the duration of the precipitation ...
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0answers
47 views

Rainfall guage stations outside the watershed

How can I determine the rainfall depth for an event over the watershed, if I just have two stations, S1 and S2, that are outside the catchment? Methods I have thought of were to take the average of ...
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0answers
64 views

Short-term forecast of Europe by using synoptic charts

I should make a short-term forecast of Europe by using synoptic charts. I'm finding it really hard so I'd be glad if you help me. 'В' means high atmospheric pressure I'm trying to figure out the ...
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2answers
114 views

Deserts and Humidity

How is that a general rule of thumb that less humidity equals more rain? Deserts don’t get much rain and humidity is also very low. Rainforests get a lot of rain when the humidity is very high so how ...
0
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1answer
99 views

Humidity and Rainfall

Usually the higher the humidity the more rainfall we get like in the summer here in Asheville, North Carolina we get a lot of showers and thunderstorms in the summer from the high humidity but I saw ...
2
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1answer
59 views

How to recharge ground water directly from river water

I am not sure if I am asking it on a correct platform or not. A rainy river passes through my village. We suffer both in summer and in rainy seasons due to this. Could anyone explain how to recharge ...
2
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1answer
44 views

Discrete distribution of daily rainfall [closed]

How can I estimate the rainfall rate every ten minutes during a day having the total amount of rainfall during that day ?
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2answers
711 views

Is there a way to approximate the density of air during rain?

Given a rate of precipitation (in mm3/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, ...
5
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0answers
89 views

Using salinity to predict rainfall

Recently, a new method has been proposed by Ray Schmitt (WHOI) and collaborators to use salinity patterns in the ocean to predict weather events (more specifically, rainfall) at scales from weeks to ...
4
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0answers
73 views

Roughly what proportion of a cloud does 'rain out'?

What proportion of the water in a cloud will 'rain out'? Or, comparing the cloud before and after it has rained, what proportion of the water is left afterwards? I really have no idea so am just ...
2
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1answer
52 views

Do daily operations (max, min etc) on climate model data reference different periods because of UTC?

If I calculate daily accumulated precipitation or daily maximum temperature from global climate data, will I be getting statistics over different local times, because the operation uses the climate ...
0
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1answer
57 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 ...
6
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1answer
606 views

Why is there no desert in Southeast China?

Arabia, Sahara and Southeast China and India all are on the tropic of Cancer yet Southeast China and India are not deserts. I know that India is not a desert because of monsoon wind which causes heavy ...
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2answers
2k views

Why do rivers sometimes travel down the opposite side of the mountains from where the rain happens?

My teacher explained that when wind coming from the ocean gets blocked by a mountain it makes rain on one side of the mountain, like in the image below. This rain leads to the creation of rivers. (...
37
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10answers
85k views

What does a mm of rain mean?

Lots of people have explained it over many sites but I still can not confidently say that I know what it means when they say Hong Kong experienced 3mm of rainfall last Friday. Does it mean that 3mm ...
2
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1answer
52 views

Estimating Average Rainfall

In a question related to my previous one. I am in the process of building a fantasy world. I have the landmasses with elevation worked out along with the air/wind directions at the various latitudes ...
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1answer
35 views

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 - ...
5
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1answer
79 views

What are typical ranges of rainfall drop sizes, speeds, and areal or volume densities?

I'd like to look into the possibility of using a Raspberry Pi and the PiCam module to detect rain, and to try to make some measurements of droplet size and rate. This could be done using an LED flash ...
6
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1answer
159 views

Do Siberia and Canada have a rasputitsa?

The rasputitsa is a muddy season that happens twice per year in West Russia, Ukraine, and Belarus. It happens in mid-October to late November due to rains, and mid-March to late April due to thaws (...
2
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1answer
38 views

Calculating mean time spent precipitating for a specified period/area?

I would like to calculate the prior probability of active precipitation currently taking place at any random moment during a year. The area I’m looking at (London, UK) has averages of 601.7mm of rain ...
6
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1answer
138 views

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 ...
98
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6answers
21k views

How can a storm drop 40 inches (1 metre) of rain?

Hurricane Harvey dumped more that 20 inches (500 mm) of rain over a large region, with 40+ (>1000 mm) in some spots... and much more expected. How is that possible? Does the atmosphere really hold ...
2
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1answer
1k views

How to prepare GrADS's .ctl file to convert grd file into .nc file in batch mode?

I have lots of grd (GrADS) file and I want to convert those data into netCDF file using cdo. The operation needs all the corresponding ctl file and I will have to prepare all these. So, my question is ...
1
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1answer
380 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 ...
3
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5answers
1k views

How is Doppler radar used in rain prediction?

How is Doppler radar used in rain prediction?
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2answers
802 views

Why is northern Australia unsuitable for agriculture?

Northern Australia receives substantial rainfall, but its population is minimal. For instance the Kimberley region in the state of Western Australia gets more than 20 in. of rainfall per year, but ...
4
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1answer
129 views

Where can I find the record for the heaviest single-day rainfall ever recorded on any date at a specific location?

I need to find out the largest amount of rainfall ever recorded in Atlanta, Georgia, USA. Where could I find this record?
5
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1answer
142 views

Why is thunder and lightning rare, even though it rains frequently?

Why in some places (for example Dublin, Ireland) the thunder and lightning is such a rare thing even though it rains so frequently?
2
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0answers
108 views

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 ...
6
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3answers
103 views

Accepting/refusing high rainfall measurement

I have a series of records of annual maximum daily rainfall for a station for about 80 years (1935-2014). Only one value is very high compared with the others, but in this year, the other close rain-...
7
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3answers
6k views

How do rivers last so long in dry weather?

I got caught in a downpour while climbing a mountain and was amazed to see, as I climbed down, the tiny trickles of water combine to form mini-streams, the dry rocks I had climbed up now hosted ...