Questions tagged [rainfall]
The rainfall tag has no usage guidance.
78
questions
0
votes
0answers
37 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
votes
2answers
70 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 ...
1
vote
2answers
70 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
votes
0answers
38 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
votes
1answer
59 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
votes
2answers
108 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
votes
0answers
23 views
How to use gridded data for a catchment scale analysis?
I need to use gridded rainfall data (0.1 degree grids) and station discharge data for analysing rainfall-runoff relationships. How do I process the data in such a way that it is justifiable to compare ...
0
votes
1answer
85 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
votes
1answer
142 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, ...
0
votes
0answers
33 views
Weather measurements of how long ago affects the amount of rainfall? (Which lags of temperature, precipitation, windspeed, radiation. humidity. )
I am trying to predict the amount of rainfall using weather measurements (temperature, precipitation, humidity, wind speed, surface radiation).
For long term, midterm, and short term predictions, ...
2
votes
1answer
41 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 ...
1
vote
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 ...
0
votes
0answers
46 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 ...
1
vote
0answers
63 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 ...
0
votes
2answers
94 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
votes
1answer
87 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
votes
1answer
55 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
votes
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 ?
0
votes
2answers
537 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
votes
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
votes
0answers
72 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
votes
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
votes
1answer
55 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
votes
1answer
436 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 ...
9
votes
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
votes
9answers
71k 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
votes
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 ...
1
vote
1answer
34 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 - ...
4
votes
0answers
42 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
votes
1answer
150 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
votes
1answer
37 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
votes
1answer
137 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 ...
97
votes
6answers
20k 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
votes
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
vote
1answer
374 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
votes
5answers
969 views
7
votes
2answers
709 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
votes
1answer
126 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
votes
1answer
115 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
votes
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
votes
3answers
102 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
votes
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 ...
3
votes
1answer
267 views
What statistical methods are best for analyzing long-term rainfall data?
What statistical tools are best analysing rainfall data (overall trends, decadal trends, intensity distribution, extremes, etc.)?
2
votes
1answer
105 views
National Weather Service “average daily/yearly” (temp, rainfall) life cycle?
Does anyone know the "life-cycle" of the averages used for daily and yearly temperatures and rainfall by the National Weather Service?
I have lived in the same (semi-desert) area for over 40 yrs, and ...
4
votes
4answers
776 views
How can we calculate the total water mass that falls during a flood?
I would like to know how to calculate how much water fell on California during, for instance, the mid-February 2017 flood. I know how to look up the total rainfall at a specific weather station. And,...
5
votes
1answer
222 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 ...
0
votes
0answers
61 views
Changes in rainfalls, sea level and tropical cyclones
Is there any scientific evidence that exploitation of natural resources (fossil energies, forests etc.) affects rainfalls or sea level, which can represent extreme events?
I read IPCC 2014 report and ...
2
votes
1answer
6k views
How to identify low or high pressure area
If rain is due to the flow of humid air from a high pressure area to a low pressure area, without the use of devices, technology or mass media is it possible to detect regions of high or low ...
8
votes
1answer
2k views
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 ...
8
votes
2answers
255 views
Could a reported rainfall pH of 3.1 actually be realistic?
In this Chemistry question Is there any reason to fear personal exposure to rain with a pH of 3.1? I haven't gotten any answer, but there was some discussion about the reality of the measurement.
So ...
