Lab Exercise 2 Lab Exercise 2 Predicting the Weather With the Barometer Reading a barometer is simple if you know what different atmospheric pressure values indicate. To understand your barometer and how atmospheric pressure is changing, interpret readings as follows (pay attention to units): High Pressure A barometric reading over 30.20 inHg is generally considered high, and high pressure is associated with clear skies and calm weather. If the reading is over 30.20 inHg (102268.9 Pa or 1022.689 mb): Rising or steady pressure means continued fair weather. Slowly falling pressure means fair weather. Rapidly falling pressure means cloudy and warmer conditions. Normal Pressure A barometric reading in the range of 29.80 and 30.20 inHg can be considered normal, and normal pressure is associated with steady weather. If the reading falls between 29.80 and 30.20 inHg (100914.4–102268.9 Pa