Question

You check the barometric pressure and find that it is reading only 920 millibars. two possible effects could be responsible for this lower-than average reading. what are they?

Answer 1

If you check the barometric pressure and find that [sic] it is reading only 920 millibars ... two effects possibly responsible for this lower than average reading are 1) elevation (~2500' MSL) or 2) a LOW pressure weather system such as a mid-latitude or tropical cyclone. Also A storm is approaching or barometer is read over a mountain