Most Mesoscale circulations are:

Question

BlackTom AI · Accepted Answer

To begin, consider what 'Mesoscale circulations' refers to in meteorology: they are localized atmospheric circulations with horizontal scales on the order of tens to hundreds of kilometers and lifetimes ranging from hours to a day or so.
Option 1: 'State-Country Sized' would imply a very large scale comparable to political boundaries, which is far beyond the mesoscale; thus this is not accurate for mesoscale phenomena.
Option 2: 'Very Short-Lived (as in seconds)' suggests lifetimes of only a few seconds, which is more characteristic of microbursts or turbulent eddies, not typical mesoscale features that persist for hours to an entire day.
Option 3: 'Permanent or Semi-Permanent' would imply a constant feature that lasts indefinitely, which does not describe mesoscale circulations that form, evolve, and dissipate with diurnal or synoptic conditions.
Option 4: 'Thermally Driven' captures the essential mechanism: mesoscale circulations like sea breezes, land breezes, urban heat island effects, and other diurnally driven flows arise from thermal contrasts between surfaces and their surroundings, making them thermally driven.

W25 MET D010 20Y Weather And Climate Processes Quiz #4

Most Mesoscale circulations are:

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