Local (microscale)
Time: few hours to ~1 day
Distance: <2 km
Phenomenon: local convection, small cumulus, fog, hill/valley drainage flows, variations in surface wind,…
Regional (mesoscale)
Time: hours to days
Distance: a few to several 100 km
Phenomenon: thunderstorms, fronts, land-sea breezes,…
Large scale (synoptic scale)
Time: up to ~10 days
Distance: several 100 to several 1000 km
Phenomenon: high and low pressure systems
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