Clouddev&stability

Clouddev&stability - Cloud Development &...

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Cloud Development & Stability
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Cloud Development & Stability Important factors for cloud formation 1. A source of moisture 2. A way for the air to cool There is a simple way to do that…force air to rise Need a lifting mechanism
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Lifting Mechanisms Four types 1. Convection 2. Topography (orographic lifting) 3. Convergence of air 4. Lifting along a weather front
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Fig. 5-10, p. 118 Orographic Lifting
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What is an air parcel? Air Parcel – a “blob” of air Recall that… Rising air cools Descending air warms Warm air is less dense than cool air But at what rate does rising/sinking air cool/warm?
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Adiabatic Process Adiabatic Process – Air parcels do not exchange energy(heat) with their environment as they rise or fall For a rising/descending parcel of air… Air parcels cool/warm at a fixed lapse rate
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Dry Adiabatic Lapse Rate (DALR) If Air parcel RH < 100% (unsaturated) Then lifted parcel cools at 10°C / km Moist Adiabatic Lapse Rate (MALR)
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Clouddev&amp;amp;stability - Cloud Development &amp;...

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