The models now included physics beyond the previous equations, such as convection schemes, diurnal changes, and snow-depth calculations.
2.
For FM broadcasting ( and the few remaining low-band TV stations ), weather is the primary cause for changes in VHF propagation, along with some diurnal changes when the sky is mostly without cloud cover.
3.
There are also slight seasonal variations in " "'g " "'due to changes in underground water tables, and larger semimonthly and diurnal changes due to tidal distortions in the Earth's shape caused by the Moon.
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