Freezing rain forms as snow, melts as it passes through a warmer layer of air and then becomes a super-cooled liquid, which freezes on impact. Freezing rain normally forms on the leading edge of a warm front overtaking a... More »

The rain shadow effect occurs as warm, moist air rises against high elevations of land and drops its water along the way. This creates a region on the far side of the mountain range that is relatively deficient in precip... More »

Acid rain slowly dissolves many types of stone. Calcium-based minerals such as marble and limestone are particularly vulnerable; this is due to calcium's reaction with the sulfuric acid in acid rain. More »

Sleet forms when snows travels through a layer of warm air, melting into raindrops, before re-freezing into tiny ice pellets upon hitting a colder layer of air. More »

A mudflow is the downhill movement of soft, wet earth and debris made fluid by rain or melted snow. Mudflows occur when water mixes with soil and rock. They are most common in mountainous regions when a long dry season i... More » Science Weather & Tides Storms

Winter storms develop when low pressure systems come into contact with a cold front or a warm front, which causes low temperature precipitation such as snow and freezing rain. Common types of winter storms caused by low ... More »

An ice storm is a dangerous weather event that occurs when snow melts in a warm layer in the atmosphere before freezing as it reaches the ground. Ice storms cause build-up of ice on roads, buildings, cars and trees. Driv... More » Science Weather & Tides Storms