Download - Weather Phenomena
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