Convection Notes - Convection Buoyancy Upward force that...

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Convection Buoyancy Upward force that acts on a parcel of air in response to a density difference Causes air parcel to rise When vertical wend shear is weak, buoyancy is dominant control of convective updrafts and downdrafts Affected by: o Higher potential temperature and water vapor content INCREASE buoyancy o Higher cloud water and precipitation DECREASE buoyancy In large-scale motion o Buoyancy ≈ Vertical pressure gradient force o Hydrostatic equilibrium In small-scale motion o Buoyancy can be significantly larger than the pressure gradient force o Bigger vertical accelerations o Non-hydrostatic equilibrium Skew-T can be used to estimate updrafts and downdrafts o As an unsaturated air parcel rises Temperature follows dry adiabat Dewpoint follows saturated adiabat o Where dry adiabat crosses constant mixing ratio- LCL Condensation begins o Rising air then follows dry adiabat o The parcel rises as long as it is warmer than the environment (instability) o If no convective inhibition: LCL=LFC Stages of Thunderstorm: Based on Buoyancy 1. An air parcel is lifted to the LFC and continues to rise (updraft). The buoyancy is positive.
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