Download Fronts

Remember Your location to the Storm center
1. Winds – North = Cold, South = Warm
2. Clouds- High – Mid – Low
3. Temperatures – Air Mass, Cold or Warm
Convergence and Divergence
Intensifying Surface Cyclone: For example, if a
region of diverging winds at upper levels is stronger than
the converging winds of a surface low pressure center
below it, the low will deepen (intensify).
Weakening Surface Cyclone: Storms fills itself
Weather Patterns & Fronts
The five types of fronts are
(1) warm front, which occurs when the surface (ground) position of a front
moves so that warm air occupies territory formerly covered by cooler air,
(2) cold front, where cold continental polar air actively advances into a
region occupied by warm air,
(3) stationary front, which occurs when the air flow on both sides of a front is
neither toward the cold air mass nor toward the warm air mass,
(4) occluded front, which develops when an active cold front overtakes a
warm front and wedges the warm front upward,
(5) a dryline, a boundary between dry, dense air and less dense humid air
often associated with severe thunderstorms during the spring and summer.
The two types of occluded fronts are the cold-type occluded front, where the
air behind the cold front is colder than the cool air it is overtaking, and the
warm-type occluded front, where the air behind the advancing cold front is
warmer than the cold air it overtakes.
Warm Fronts
Warm air rises
1. Clouds
2. Winds
3. Temps
Warm Fronts
Winds & Temps
Warm Sector
South/Southwest
Type of Clouds
• Ci- Cirrus – High thin crystal like. First
signs of warm air moving in
• As- Alto Stratus- Mid level Blanket
• More clouds, higher humidity
Type of Clouds
• Nimbo/Nimbus -- Rain cloud, Dark gray.
Steady all day rain/snow.
• Clouds of Vertical Development - Cumulus
and Cumulonimbus. They develop into
towers or domes
• Cumulonimbus – Thunderstorms,
heavy rain
Cold Fronts
*Fast Rising Air, Condensation, Clouds
*Pressure falls,
wind shift
Will it Snow or Rain?
• Temperature Profile
Precipitation – Rain, Snow, Sleet,
Freezing Rain
• Temperature Profile of the Atmosphere.
- Is it warm or Cold. Above 32 or below
• Rain – All Layers above 32
• Snow – All Layers below 32
• Sleet – Cold, Warm, Cold Layers
• Freezing Rain – Warm, Shallow Cold Air
Examples
What type of Weather
Remember Your location to the
Storm center
1. Winds – North = Cold,
South = Warm
2. Clouds- High – Mid – Low
3. Temperatures – Air Mass,
Cold or Warm
Precipitation – SNOW
Snow – All Layers below 32 Degrees
Precipitation – Sleet
Sleet – Cold, Warm Cold layers
Precipitation – (Glaze) Freezing Rain
Freezing Rain – Warm, Cold Surface