Watching the weather report this morning and they said there will likely be 15cm of new snow. How do they work this out?
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Computer models track and predict the movement and development of individual cells of atmosphere. Are they going to rise or fall? Warm up or cool down? Gain or lose water? Merge with other air masses? Exceed the “dew point” where moisture condenses or have too little turbulence or convection to keep droplets suspended? All that feeds into models of likely outcomes based on past history.
Because weather is highly chaotic system (in the scientific sense) some of the most powerful supercomputers are used by meteorological organisations to do this.
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