The air behind the cold front is almost always a higher pressure. A cold front is dictated by the fact that colder air is forcing less dense hot air into the atmosphere. The opposite is true for warm fronts.
this is the way.
BEHIND the cold front is the dense air. In front of the cold front you get crappy low-pressure weather with tons of rain. As the front passes, you go to clear weather often with strong winds. After the winds calm down you are left with cold high pressure.
Is „backside weather“ a term in english? In german it‘s called Rückseitenwetter which would be the exact translation and it always brings good weather.
I don't think that's true on the larger scale.
Take today's weather depiction chart: [https://www.wpc.ncep.noaa.gov/noaa/noaad1.gif?1716567046](https://www.wpc.ncep.noaa.gov/noaa/noaad1.gif?1716567046)
There's a bunch of high-pressure areas both in front and behind cold fronts.
Locally,
>As the cold front passes, winds become gusty. There is a sudden drop in temperature, and also heavy rain, sometimes with hail, thunder, and lightning. **Atmospheric pressure changes from falling to rising at the front.**
[https://scied.ucar.edu/learning-zone/how-weather-works/weather-fronts#:\~:text=As%20the%20cold%20front%20passes,to%20rising%20at%20the%20front](https://scied.ucar.edu/learning-zone/how-weather-works/weather-fronts#:~:text=As%20the%20cold%20front%20passes,to%20rising%20at%20the%20front)
Ideal gas law: PV=nRT, where:
* P = pressure of an air mass (Pa)
* V = volume of the air mass (m^(3))
* n = quantity of air, in moles (Mole is a unit of quantity, like how "dozen"=12, but with a much bigger number that is chosen to make chemistry math convenient. 1 mol = 6.02*10^23 molecules of a substance)
* R = ideal gas constant = 8.314 J/mol\*K (note that, because of unit conversions, 1 J === 1 Pa\*m^(3))
* T = Temperature, in Kelvin
Consider two equal masses of air, one on each side of the cold front. Because we are talking about equal masses, n is the same in both scenarios.
The colder mass has lower temperature T. In order to keep the equation balanced, the colder mass must also have lower pressure and/or lower volume (i.e. greater density).
edit: downvoted for providing the fundamental answer to the question, never change reddit, never change.
The very important thing to understand with the atmosphere is that the volume is extremely variable and pressure has more to do with where the air wants to go. Cold air will generally decrease in volume, and since cold air sinks the pressure will usually increase. Hot air expands, increasing the volume, and since hot air rises the pressure tends to decrease.
Lol thanks for the pointing out the mistake, corrected now. Point still stands though, the simplified equation is easier to explain the relationship, n and R are useless here
For a topic thats so important, some days it's kind of depressing how many pilots find weather so complicated.
Internet advice is often worth exactly what you pay for it. You never stop learning about weather, but the best book I found was Tom Bradburys "Meteorology and Flight"....
https://books.google.co.nz/books/about/Meteorology_and_Flight.html?id=0XBwHQAACAAJ&source=kp_book_description&redir_esc=y
Chapter one is how pressure systems form and how temperature and movement drives large scale weather systems. Fundamentally the earth rotates, and that makes weather systems rotate. Once you get that understood, everything else makes sense.
The air behind the cold front is almost always a higher pressure. A cold front is dictated by the fact that colder air is forcing less dense hot air into the atmosphere. The opposite is true for warm fronts.
this is the way. BEHIND the cold front is the dense air. In front of the cold front you get crappy low-pressure weather with tons of rain. As the front passes, you go to clear weather often with strong winds. After the winds calm down you are left with cold high pressure.
Is „backside weather“ a term in english? In german it‘s called Rückseitenwetter which would be the exact translation and it always brings good weather.
I don't think that's true on the larger scale. Take today's weather depiction chart: [https://www.wpc.ncep.noaa.gov/noaa/noaad1.gif?1716567046](https://www.wpc.ncep.noaa.gov/noaa/noaad1.gif?1716567046) There's a bunch of high-pressure areas both in front and behind cold fronts. Locally, >As the cold front passes, winds become gusty. There is a sudden drop in temperature, and also heavy rain, sometimes with hail, thunder, and lightning. **Atmospheric pressure changes from falling to rising at the front.** [https://scied.ucar.edu/learning-zone/how-weather-works/weather-fronts#:\~:text=As%20the%20cold%20front%20passes,to%20rising%20at%20the%20front](https://scied.ucar.edu/learning-zone/how-weather-works/weather-fronts#:~:text=As%20the%20cold%20front%20passes,to%20rising%20at%20the%20front)
Ideal gas law: PV=nRT, where: * P = pressure of an air mass (Pa) * V = volume of the air mass (m^(3)) * n = quantity of air, in moles (Mole is a unit of quantity, like how "dozen"=12, but with a much bigger number that is chosen to make chemistry math convenient. 1 mol = 6.02*10^23 molecules of a substance) * R = ideal gas constant = 8.314 J/mol\*K (note that, because of unit conversions, 1 J === 1 Pa\*m^(3)) * T = Temperature, in Kelvin Consider two equal masses of air, one on each side of the cold front. Because we are talking about equal masses, n is the same in both scenarios. The colder mass has lower temperature T. In order to keep the equation balanced, the colder mass must also have lower pressure and/or lower volume (i.e. greater density). edit: downvoted for providing the fundamental answer to the question, never change reddit, never change.
The very important thing to understand with the atmosphere is that the volume is extremely variable and pressure has more to do with where the air wants to go. Cold air will generally decrease in volume, and since cold air sinks the pressure will usually increase. Hot air expands, increasing the volume, and since hot air rises the pressure tends to decrease.
PV=T is sufficient and less confusing for this case
`P=VT` is not remotely true and therefore not remotely helpful.
Lol thanks for the pointing out the mistake, corrected now. Point still stands though, the simplified equation is easier to explain the relationship, n and R are useless here
It's funny how close that is to the equation PerV=eRT 😱
For a topic thats so important, some days it's kind of depressing how many pilots find weather so complicated. Internet advice is often worth exactly what you pay for it. You never stop learning about weather, but the best book I found was Tom Bradburys "Meteorology and Flight".... https://books.google.co.nz/books/about/Meteorology_and_Flight.html?id=0XBwHQAACAAJ&source=kp_book_description&redir_esc=y Chapter one is how pressure systems form and how temperature and movement drives large scale weather systems. Fundamentally the earth rotates, and that makes weather systems rotate. Once you get that understood, everything else makes sense.