Questions tagged [rain]

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36
votes
9answers
65k 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 ...
18
votes
3answers
5k views

Does rain (temporarily) deplete the surrounding atmosphere of carbon dioxide?

CO2 in the air dissolves into rain water, making them slightly acidic. Is that enough to deplete the surrounding air out of CO2? If yes, how fast does this occur? Is it only with the first drops of ...
11
votes
1answer
2k views

How to tell the difference between real rain and fake rain (cloud seeding)?

I live in a city where the pollution is bad, so bad that sometimes we get 'fake' rain (from cloud seeding). This may last for an extended period. There have been times before when it has “rained” and ...
10
votes
1answer
210 views

Rainbow dynamics?

How would steam refract light compared to fog and how would the rainbow appear? Does the temperature of the water drop or ice crystal effect the rainbow in any way? I know the size of the water drop ...
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. (...
8
votes
2answers
1k views

How accurate is a tipping-bucket rain gauge?

My question is simple - how accurate is a tipping-bucket rain gauge? I have read about what causes the errors (wind, bucket mechanics for extreme events, ...) and I know the accuracy is strictly ...
6
votes
1answer
177 views

What is the significance of the “super historic” rainfall for July 2015 in southern California?

On July 19, 2015 there was record rainfall over the Los Angeles and San Diego areas. This is amidst a historic drought and the rain is needed. This article: http://www.weather.com/storms/hurricane/...
6
votes
2answers
129 views

Is pollution a contributing factor to freezing rain?

I have been to different places with nearly the same freezing temperatures, around -2°C, but only at some specific places I repetitively experienced freezing rain. One common factor at these places ...
6
votes
1answer
363 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 ...
5
votes
1answer
112 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?
5
votes
1answer
4k views

What would the pH of rainwater be if carbon dioxide in the atmosphere doubled?

Natural rain water is slightly acidic (pH = 5.6) since there is carbon dioxide in the atmosphere that dissolves to make carbonic acid. What would be the pH of rainwater if carbon dioxide in the ...
4
votes
1answer
109 views

How effective is seeding rainclouds? What are the indications for initiating seeding?

I've heard that dry ice, iodides have been used as seeding agents to induce rainfall. Is this technique really being used widely? What are the prerequisites for initiating seeding? Is it as bounteous ...
4
votes
1answer
531 views

What is a pre-monsoon shower? Is there any distinguishing feature between monsoon and pre-monsoon showers?

While attending a lecture about monsoon, our professor mentioned about pre-monsoon showers. However, he never bothered to explain it. So, what is a pre-monsoon shower and what are its distinguishing ...
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 ...
3
votes
1answer
81 views

If we could green the Sahara, would it be able to sustain itself?

Let's say at some point in the future we have an abundance of fresh water (for example because we have enough energy to power many desalination plants) and we can turn the Sahara into green land by ...
3
votes
1answer
62 views

Rain Water vs Sprinkler Irrigation

During the rainy season, the crops like corn, cotton are found to be growing faster. Studies shows that the thermoelectric fixation of gaseous Nitrogen during rain storm accelerates the plants growth ...
3
votes
1answer
1k views

By how much can rain temperature vary from the ground-level air temperature?

I'm guessing that falling rain equilibrates fairly quickly to the temperature of the air it's falling through. However, it isn't always at the exact same temperature, which is why we can get the ...
3
votes
5answers
919 views

How is Doppler radar used in rain prediction?

How is Doppler radar used in rain prediction?
2
votes
4answers
1k views

What is the difference between dew and rain?

What is the main difference between dew and rain? Would it be correct if we say that rain is done in the upper troposphere while dew done in the lower troposphere? Or there are better definitions for ...
2
votes
1answer
5k views

Why does it rain during the sunny day?

What are factors that cause rainfall while the sun is still shining. The phenomena is known as sunshower? The information I found so far is very limited. Please help me answer this question if you ...
2
votes
1answer
151 views

Reason for rotting smell after first rain of the season?

Last day we had first rain after 3-4 months of hot&dry weather, and within 3-4 minutes a rotting smell came from nowhere. Due this smell I had running nose for a day. What might be the reason for ...
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 ...
2
votes
0answers
73 views

Is pollution the reason why rainbows are so rare nowadays?

Today I saw a rainbow after almost a decade. I live in Noida (a city) in India. Most people I know believe that: we don't see rainbows nowadays because of pollution and now after nearly 3 months since ...
2
votes
0answers
53 views

Asian South West Monsoon - Rainfall in South East Coast of India

So Indian peninsula has v shaped mountain ranges. Western ghats and Eastern ghats as shown in the picture. During Summer Monsoon, the wind flows from Indian ocean to land mass, and due to Coriolis ...
2
votes
2answers
117 views

Temperate Rainforests

I have heard that the Appalachian Mountains is qualified as a temperate rainforest. What qualifies a temperate rainforest and what makes the Appalachian Mountains a temperate rainforest?
2
votes
0answers
92 views

Are these tropical forests burning in Brazil and elsewhere really rainforests?

I know from many years of personal experience in the Malaysian rainforest (Sarawak, Sabah and Peninsular Malaya) that it is not inflammable. Dayaks and aborigines cultivate small patches of shifting ...
2
votes
0answers
159 views

Why are all rainbows are not the same? [closed]

How does these rainbows water drops differ? I know it has to do with the size of water drops refracting light. Is there a formula that determines the type of rainbow? Icebow Unlike this questions ...
2
votes
2answers
181 views

Conditions of Thunderstorms

Why do some heavy rainstorms and hailstorms not produce any lightning or thunder at all when I thought that these conditions of heavy rain and hail are right to bring lightning and thunder but don’t ...
1
vote
2answers
62 views

Chloride ions for the salty seawater

Where does the chloride ions that are required for the salty taste of sea water come from ? I know that it is the weathering caused by the slightly acidic (due to dissolution of CO2 with water) rain ...
1
vote
1answer
51 views

How to curb losses during annual heavy rainfalls

Every year I see these sort of news articles where states are flooded particularly due to their geographical location and vicinity to flood prone areas, however year after year there is no improvement ...
1
vote
1answer
320 views

Thunderstorms vs Thundershowers

What is the difference when the weather report says thunderstorms vs when it says thundershowers and the picture is still the same?
1
vote
0answers
29 views

Thunderstorms in the Great Smoky Mountains [duplicate]

What time of the year does it rain the least in the Great Smoky Mountains National Park and what month gets the least amount of thunderstorms
0
votes
2answers
521 views

What happens if it rains above the boiling point of water?

The freezing point of water is 32°F. If it rains at a temperature lower than that, it will snow. However, let's say we dig a deep hole not filled with water that goes like 10,000 feet below sea level. ...
0
votes
2answers
422 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, ...
0
votes
1answer
51 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
101 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
32 views

Has there been any days in the lower 48 states of the USA with no recorded rain?

Today I looked at the radar for the US and it looked pretty sparse, which lead me to wonder, have there been any days/times with no rain within the entirety of the region?
0
votes
0answers
90 views

Rain during Hot Weather

During hot weather, it is uncommon for there to be rain without lightning and thunder if the weather is hot. I find that the general rule of thumb is that if it is raining while it is 70 degrees or ...
0
votes
0answers
87 views

Can airplanes trigger rain?

A lady was telling me that the lower clouds were contrails left from plane exhausts. I looked up and there were none I could see in the sky she pointed to Stratocumulus Clouds. I did not want to tell ...