Weather Phenomena

By: Rodrigo VelardePaloma CastellanoSebastián Velarde

Juan Fernando Bazo

Stable

Unstable

Stable

Dew

Fog -Radiation

Fog - Advection

RimeHoar Frost

• Looks like a blanket of ice crystals• Moisture directly condenses onto any surface

below freezing point temperature• Develops under clear, calm conditions

Hoar Frost

• Rime is a frost caused by supercooled droplets in the air

• Rime freezes onto anything solid• Covers every surface in a film of ice

Rime

• Leaves water droplets covering surfaces in the morning• Occurs on cool nights when moisture in the air condenses but it is not cold enough for it to freeze.

Dew

• Warmed air moves over a cold surface

• Air is cooled and condensation results

• Sea fogs are always advection fog.

Fog - Advection

• Clouds that form near the ground as result of condensation

• Cold land cools the air above it, leading to moisture in the air condensing

Fog - Radiation

Unstable

Rainfall - Orographic

Rainfall - Convectional

Rainfall - Frontal Hail

• Hail is a form of solid precipitation

• Made of ice and measures between 5 and 200 millimeters in diameter

• Hailstones generally fall at higher speeds as they grow in size

Hail

• When warm air is forsed to rise due to a barrier like a mountain or a slope

• As the air rises it cools until it reaches dew point, when clouds are formed

• Rainfall occurs on mountain. Areas on the other side of the mountain often have dry climates (Rain shadow effect)

Rainfall - Orographic

• The land heats up the air above it• The air rises, it cools, until it reaches

dew point temperature. Condensation of moisture creates cloud and rain follows

• The hotter the day, the more likely there will be convectional rainfall

Rainfall - Convectional

• Occurs when warm and cold air masses meet

• The less dense warm air rises above the cold air

• The rising air cools until dew point, condensation, precipitation

• Regularly occurs at 60º North and South on the Tri Celular model

Rainfall – Frontal or Cyclonic

The End