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Questions tagged [rainfall]

Rainfall refers to a meteorological phenomenon and the most commonly occurring form of precipitation.

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16 votes
5 answers
9k views

How is rainfall measured when the news speaks of "two inches of rain"

I left a wheelbarrow outside overnight and it rained heavily. This morning, the water in the wheelbarrow is five (5) inches deep. It's not sitting under an eave where water might have been channeled ...
Tim's user avatar
  • 281
3 votes
2 answers
1k views

How to convert precipitation rate from kilogram per square meter per second (kg m-2 s-1) to millimeter per hour (mm h-1)?

I need some guidance or clarification regarding the units for precipitation rate or precipitation intensity (esp. for rainfall). I'm used to precipitation intensity being expressed in millimeters per ...
Brian Añano's user avatar
1 vote
1 answer
300 views

Why are eastern Oregon and southeastern Washington so dry?

Why are eastern Oregon, southeastern Washington and southern Idaho so arid, as compared to the humid and lush western Oregon and Washington? In Oregon and Washington there is quite an abrupt boundary ...
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3 votes
0 answers
193 views

Investigating the "Leesburg split" rainfall anomaly

I've spent some time in the Leesburg, Virginia (USA) area and I've noticed that whenever a line of thunderstorms approaches the area, it frequently splits and goes around a particular spot just ...
SlowMagic's user avatar
2 votes
2 answers
84 views

Is 1 inch of rain in an hour enough to damage growing crops?

An odd discussion came up on a role-playing game forum recently. Some people were speculating about how a mediaeval society would be different if it had wizards, with the spells described in the game ...
A. B.'s user avatar
  • 121
6 votes
1 answer
627 views

Why is the eastern United States green if the wind moves from west to east?

I was always under the impression that evaporated water from the Atlantic Ocean traveled west to hydrate the eastern U.S. and that not only did the western U.S. have to deal with rain shadows from ...
Thesaurus Rex's user avatar
1 vote
1 answer
69 views

Is good rainfall in the UK the result of being a small island surrounded by large moving seas, having mountains and trapped salt [closed]

If the mountains were levelled and salt removed would the country experience as much rainfall? Context Damp in houses: Salt absorbs moisture: think of plaster walls that grow mould from proximity to a ...
Steve Tomlin's user avatar
1 vote
0 answers
18 views

compute joint probability of two variables with out using copulas

I have two timeseries one for a daily rainfall and another one for a daily storm surge height. I would like to calculate the probability of a certain rainfall depth with a certain storm surge height. ...
moinabyssinia's user avatar
3 votes
0 answers
51 views

Where does the water in the Euphrates and Tigras rivers come from?

The research I've done says that the rivers are fed by alpine snow, lakes and rains in the Taurus mountains but I'm specifically interested in whether the rains/snows and the water that feeds the ...
Wally's user avatar
  • 31
0 votes
0 answers
43 views

Map showing the change in precipitation intensity

Hi I need a map for the North American region that shows the change in rainfall intensity. Unfortunately, I can only find maps like this map Unfortunately, these are not detailed to use.
Weiss's user avatar
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2 votes
0 answers
13 views

Empirical adjustment factors for generating sub-daily precipitation values (for IDF curves)

I am trying to generate an Intensity-Duration-Frequency (IDF) curve using 6-hourly precipitation data. These curves are used to estimate the return period for a rain event with a specific intensity (...
AR1p's user avatar
  • 21
1 vote
1 answer
125 views

Would the Climate change in Southern Africa by Filling Lake Makgadikgadi Evaporation Pans with water from the Zambezi and Chobe Rivers?

I have Macro question, and have enquired and discussed this topic with numerous people. My background is more in Economics and Finance, and read a very interesting article if I am not mistaken 10-15 ...
Charl Yazbek's user avatar
1 vote
0 answers
59 views

Where can I live if I like long periods of consistent rain?

Let me elaborate on what I mean by "long periods of consistent rain". I currently live in London and contrary to popular belief, it's not rainy. When it rains, it's usually only for 20 ...
Marco Prins's user avatar
1 vote
1 answer
894 views

Calculating total daily rainfall from a tipping bucket rain gauge

I am trying to calculate total daily rainfall based on data from a tipping bucket rain gauge which is calibrated to a tip of 0.2mm. I have data giving the exact time that a tip is recorded and have ...
eH156683's user avatar
4 votes
1 answer
65 views

Easiest way to visualize precipitation drainage using raster elevation files in R?

As a non-specialist, enviro-enthusiast, I am curious about visualizing post-precipitation run-off in my local area. I have been able to access and download appropriate elevatio rasters for my local ...
CharismaticChromoFauna's user avatar
5 votes
0 answers
84 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 ...
saQuist's user avatar
  • 153
6 votes
5 answers
169 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 ...
qdinar's user avatar
  • 199
4 votes
0 answers
82 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 ...
rwallace's user avatar
  • 705
4 votes
1 answer
1k 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) ...
uhoh's user avatar
  • 7,092
17 votes
8 answers
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 ...
uhoh's user avatar
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3 votes
1 answer
478 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 ...
Yosef's user avatar
  • 31
3 votes
2 answers
308 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 &...
WoJ's user avatar
  • 279
5 votes
3 answers
414 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 ...
Galan J's user avatar
  • 51
3 votes
3 answers
338 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 ...
ajilesh's user avatar
  • 377
1 vote
0 answers
47 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. .. ...
dan.potato_baker's user avatar
1 vote
0 answers
86 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? ...
Kay's user avatar
  • 461
3 votes
2 answers
2k 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 ...
Edward's user avatar
  • 55
1 vote
2 answers
124 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 ...
Dex's user avatar
  • 11
5 votes
0 answers
168 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.
nicc96's user avatar
  • 51
1 vote
1 answer
436 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 ...
fsp's user avatar
  • 113
1 vote
1 answer
402 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 ...
Dantavious W.'s user avatar
1 vote
1 answer
3k 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 ...
code123's user avatar
  • 113
3 votes
1 answer
707 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, ...
fof's user avatar
  • 43
2 votes
1 answer
48 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 ...
y chung's user avatar
  • 704
1 vote
0 answers
39 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 ...
DGIS's user avatar
  • 341
1 vote
0 answers
56 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 ...
hindreen mohammed's user avatar
1 vote
0 answers
73 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 ...
Math Student's user avatar
1 vote
2 answers
541 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 ...
Ryan Amalfitano's user avatar
1 vote
1 answer
218 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 ...
Ryan Amalfitano's user avatar
4 votes
3 answers
251 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 ...
user avatar
2 votes
1 answer
47 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 ?
nour's user avatar
  • 21
1 vote
2 answers
2k 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, ...
bentheiii's user avatar
  • 113
7 votes
0 answers
104 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 ...
arkaia's user avatar
  • 15.5k
5 votes
0 answers
102 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 ...
Evan Benn's user avatar
  • 151
3 votes
1 answer
66 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 ...
HamishC's user avatar
  • 31
0 votes
1 answer
65 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 ...
ExploreR's user avatar
  • 101
7 votes
1 answer
1k 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 ...
gbd's user avatar
  • 173
10 votes
2 answers
3k 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. (...
MrDi's user avatar
  • 201
42 votes
10 answers
150k 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 ...
coder123's user avatar
  • 521
2 votes
1 answer
68 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 ...
C Viau's user avatar
  • 71