Usually expressed as a fraction, this is way of showing the relative size of two numbers,
as when 24/30 is written as 4/5, meaning 24 has as many groups of 4 as 30 has groups of

Ithink that its like 15 mph.

Ibelieve the answer is relative humidity  because it makes more sense that way. solar flares usually occur in space it doesn't affect the earth, well it could but it wont make a significant damage.  latitude is land it doesnt do anything. prevailing winds, i dont know the correct meaning for this but i doubt that affects the land so it has to be relative humidity.

Where's the picture of the model?