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1answer
30 views

Water vapor content versus specific humidity

I am wondering the difference between water vapor content and specific humidity to determine the moisture availability in the atmosphere. Which one is more acceptable variable to determine the ...
4
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1answer
180 views

How would I use data to find specific humidity and mixing ratio?

I keep reviewing this table to compare and contrast my results: The parcel of air is at 35°C and a relative humidity of 43%. I used this online calculator and it stated that with these two factors ...
5
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1answer
287 views

How to calculate humidity using outside temperature and outside relative humidity?

I would like to ask how to calculate the relative humidity that a heated indoor area would have using only outside temperature and outside relative humidity. I found the Relative Humidity Calculator ...
3
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0answers
785 views

Is this an accurate simulation of a further south Australia with a filled lake Eyre?

I created this climate map based on a simplified Koppen Climate Classification map (shown below). In this scenario Australia is moved 10 degrees of latitude further south and the Lake Eyre basin is ...
1
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1answer
65 views

Why a stratus cloud does not always reach all the way to the ground?

The surface of the ground at night cools down because of outgoing long-wave radiation. In my understanding the cooling of the surface also causes cooling of the adjacent air. If the air contains ...
0
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1answer
316 views

What is the mixing ratio of a cloud?

A cloud has relative humidity of 100% or more. Is it correct to say that the mixing ratio of a cloud is undefined? My reasoning is that dry air in a cloud is negligible therefore $w = \frac{x g}{ 0 kg}...
3
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5answers
269 views

Why does relative humidity seem to correlate with high temperature (at least where I live)?

I live in New Jersey. Now that summer is coming on us, temperatures and outdoor relative humidity are both increasing. I've noticed the few years that I've lived here that there seems to be a rough ...
6
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3answers
251 views

Is there a name for these “pouring” clouds?

I snapped this photo with my phone flat against the window of a bus, facing south while traveling west across a bridge in New Taipei City. I'd say it was at about 24.995N, 121.438E. It was about 14:00 ...
2
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1answer
388 views

Why do anticyclones bring clear skies in summertime?

It's obvious that in summer anticyclones bring hot weather. But why clear skies? Heat evaporates the moisture and should lead to the cloud formation, shouldn't it?
3
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1answer
700 views

How does humidity vary with height in the Earth's atmosphere?

I am busy with the development of an "environment" model that can be used for flight simulation of all kinds of flight vehicles — ranging from quad-copters, unmanned aerial vehicles, manned aircraft, ...
14
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1answer
297 views

Why (actually) is the night sky so bright in the city? How far up is that happening?

The recent news reported by the New York Times, the BBC and the NPR web sites (for example) as well as in the Iceland Review and Iceland Magazine sites, about the shutting-off of Reykjavik's ...
0
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1answer
399 views

Mild climate, low-humidity city all year round [closed]

Where in the world can I find a place with mild / warm and non-humid climate all year round? What I'm looking for is a city with these characteristics: - monthly average low temperature > 5°C (41°F) -...
3
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2answers
2k views

Can relative humidity be over 100% near (within 30-60m) the surface?

I am processing a big meteorological data set, which is a global forcings dataset derived by other datasets and observations, and calculating relative humidity from qair,temperature, and pressure ...
0
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0answers
118 views

Converting Specific humidity to relative humidity ( MERRA data ) [duplicate]

I'm using Merra Reanalysis data and I encountered some difficulties : In Merra files we can find : Specific humidity at 2 m above the displacement height (Kg/Kg) but I need Relative Humidity (%) ... ...
3
votes
2answers
4k views

Is it hotter in different places with the same air temperature?

I am from (and live in) Minnesota, USA. In the summer here it always reaches temperatures in the 90s (F) for periods of time but not every week. The humidity is often high and the dew point often ...
1
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1answer
66 views

How strong is the correlation between the dew point of a town and the seawater temperature next to that town?

For example, the towns that has the highest dew point are usually next to the Red Sea and the Persian Gulf where the seawater temperature exceeds 30 degrees in summer.
4
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1answer
315 views

Accurately Measuring Indoor/Outdoor Air Temperature & Relative Humidity

I’m conducting an independent study as a concerned citizen on the indoor temperature at an animal shelter to support the need of improved air conditioning by documenting how hot it can reach during ...
4
votes
2answers
893 views

Does usual city pollution have effects on relative humidity?

I've noticed that in a rural area with low pollution the relative humidity is constantly lower than the humidity in a high polluted city. Is there any correlation between pollution and humidity?
5
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2answers
3k views

Why doesn't it snow even when it is below freezing?

I know the temperature of a place is determined by various factors, a few of which I can think of are: Altitude, distance from sea, latitude, wind etc. My question is basically regarding latitude. ...
4
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0answers
27 views

Can humidity changes induce stacking-sequence changes?

My understanding is that some minerals with layered crystal structures will reversibly absorb water with changes in humidity. Are there any minerals where this reversible absorption leads to a ...
7
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1answer
10k views

How to calculate specific humidity with relative humidity, temperature, and pressure

I know there is this question already How do I convert Relative Humidity into specific humidity but I don't have ρws = density of water vapor (kg/m3) and ρ = density of the moist or humid air (kg/m3)....
6
votes
1answer
510 views

Specific humidity range in tropical lowlands?

I am running a land biosphere model that uses meteorological data as drivers. The model has a threshold of 32g/kg for specific humidity. The data I am using taken from a reanalysis performed by J. ...
26
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2answers
34k views

At what humidity does it start to rain?

As far as I understand it is perfectly valid for air to have 100% humidity. At that point, all water can still exist in form of vapor, non-condensed. Does it immediately start to rain if humidity is >...
10
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3answers
4k views

What does the notation “kg kg-1” for units mean for specific humidity

I am using a data set from Justin Sheffield at Princeton that includes specific humidity. The description is as follows: "Reanalysis 6-hourly specific humidity interpolated to 1.0deg with account ...
4
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1answer
504 views

How and why humidity and vapour pressure change as a parcel of air with an unchanging amount of water vapor rises, expands, and cools

I know that a parcel of air can rise, cool and create clouds and rain but I'm struggling to understand how: absolute humidity relative humidity actual vapour pressure saturation vapour pressure ...
4
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1answer
107 views

Fictional Land - How can I keep dense fog in an area for half a day? [closed]

This question is now here on Worldbuilding Stack Exchange I am a writer, and this question is for a fictional work. However, given its nature, I believe it is better suited here than Writers Stack ...
7
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1answer
195 views

LWC and Absolute Humidity

What is the difference between "liquid water content" and "absolute humidity" in meteorology? Both have units of mass/volume.
7
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1answer
947 views

How to calculate relative humidity?

I am involved in developing a weather based application which needs to calculate relative humidity and display it. I grab other weather variables like temperature, precipitation, wind speed and ...
10
votes
2answers
524 views

Why is q used for specific humidity?

$q$ is the symbol used for specific humidity in many textbooks and papers (at least in meteorology and climatology, I'm not familiar with it in other disciplines). Where does this symbol come from, ...
20
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3answers
31k views

How do I convert specific humidity to relative humidity?

How do I convert specific humidity to relative humidity? What variables are needed (e.g. air temperature, pressure, etc.)?
9
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1answer
378 views

How can I downscale daily values of relative humidity?

I have a dataset (The ISIMIP interpolation of CMIP5 output) that contains daily values of the following variables: ...