GEOG 111 1st Edition Lecture 30 Outline of Last Lecture I Types of weather around wave cyclones II Cyclone tracks a The Alberta Clipper b Texas Great Lakes c The Gulf Atlantic Coast III Frozen precipitation a Types b Weather setup Outline of Current Lecture I Processes associated with freezing rain development II Factors that control ice buildup III Weather features that produce big ice storms Current Lecture I Processes associated with freezing rain development a Higher altitudes i Snow Bergeron process b Warm nose i Warm advection warming 1 Warmer air coming from south south west carrying air north produces warm nose a Frontal lifting b Warmer air forced over colder air ii Melting of snow cooling 1 Sensible heat converted to latent heat iii Frontal lifting cooling 1 As air rises it cools c Cold wedge i Freezing of rain warming freezing rain is a self limiting process 1 Sensible heat is liberated by freezing rain a Need constant supply of cold dry air for an ice storm ii Dry air evaporation of rain because air is not saturated cooling iii Cold air advection cooling 1 Bottom of column II Factors that control ice buildup a Antecedent temperature of surface These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute i Example ice accumulation on south vs north facing slopes asphalt low albedo vs concrete surface cooler more light reflecting more likely to buildup ground vs tree limb doesn t take long for them to cool off exposed to wind b Wind speed i Materials will go down to freezing more quickly c Rainfall rate duration i In a given ice storm freezing rain isn t falling too quickly ii Ideal lower rate of precipitation over a longer duration III Weather features that produce big ice storms a Strong anticyclone to the north that provides a replenishing supply of cold dry air b Slow moving wave cyclone that moves south of the area and provides persistent warm and moist air advection over the wedge of cold air
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