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MET 140 Study Guide - Midterm Guide: Survival Kit, Blizzard Warning, Freezing Drizzle

Course Code
MET 140
Study Guide

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These are the important topics for the fourth exam. This list is not all inclusive, but is meant to
serve as a guide. Studying your quiz, homework, and lecture notes will all help. The textbook
will also be of great help, with most of the material coming from Chapters 12, 13, 14, 15, 25, and
The test will consist of 38 multiple choice questions worth 2 points each, 20 true or false
questions worth 1 point each, and a diagram question worth 4 points.
Icestorms and Lake-effect Snowstorms
Know what supercooled water is.
oLiquid that is below the freezing temperature
oFreezes as soon as it comes into contact with the surface
Freezing Rain
oFreezing participation formed by the melting process
oMelting Process  When snow falls into an atmospheric level that is above freezing and
melts into rain, then keeps falling and enters a freezing layer of air near the ground and
becomes supercooled.
Freezing Drizzle
oWhen super cooled water falls to the ground because it grew so much it got too heavy
and fell.
oKnown as the supercooled warm rain process
oSignificant aircraft icing hazard
Know the effects of freezing precipitation.
oCreation of glaze on the surface that causes traffic and pedestrian accidents.
Know in what regions freezing rain and drizzle are most common.
oFreezing rain is most common in North-Eastern North America
oFreezing drizzle is most common in mid-Northern North America as well as North-
Understand why the lake-effect snow occurs.
oLake-effect snow fall occurs when cold air (wind) moves across a lake where friction is
reduced and causes divergence. As the air moves across the lake, the warm heat from the
lake transfers to the air just above and warms it. Moisture is also transferred from the
water to the air above through evaporation. Once this occurs the air destabilizes and
forms cumulus clouds.
What happens to the lake-effect snow when the lake freezes?
oWhen the lake freezes, lake-effect snow no longer occurs due to the inability of the warm
lake water and cold air to interact and swap moisture and temperature.
What is lake-enhanced snow?
oOccurs when the lakes enhance snowfall caused primarily by a different weather
phenomena, instead of creating their own snowfall. These snowstorms are
typically worst than lake-effect snowstorms since multiple processes are creating
Cold Waves and Blizzards
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