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Increasing means the air pressure is becoming higher as the denser cold air is sinking.The sinking motion of cold air inhibits cloud formation and any cloud would evaporate/dissipate., so you will see clear and cloudless skies.If the pressure is decreasing, it means warm air is rising. The skies are becoming cloudy. If the warm air contains sufficient moisture, huge cumulus clouds will develop and soon you will encounter showers or storms.