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Fronts Notes.notebook December 01, 2016
üboundaries that separate air masses; can form between any two different air masses
üoverrunning: is where warm air glides up along a cold air mass because warm air is less dense and rises easily
üFour types of fronts:oWarmoColdoStationaryoOccluded
Fronts
Warm Fronto Advancing warm air moves in and occupies an area covered by cooler air
o Warm air glides up and over a cold air mass.
o Produces light to moderate precipitation
o Appears on the weather map as a solid red line with semicircles facing the direction the front is heading
Fronts Notes.notebook December 01, 2016
Cold Fronto Advancing cold air mass moves warm air out and up
o Usually move faster than warm fronts and have a steeper slope
o The warm air cools as it rises and condenses
o Produces clouds, showers, and thunderstorms
o Appears on the weather map as a solid blue line with triangles facing the direction the front is heading
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Stationaryo Two air mass meet but do not move on each other or moves very slowly
o Overrunning usually occurslight to moderate precipitation; precipitation could last several days.
o Appears on the weather map with a combination of warm and cold front symbols
Fronts Notes.notebook December 01, 2016
Occluded Fronto Cold air moves so fast it overtakes a warm air mass
o Warm air is squeezed upward between two cold air masses
o Precipitation is formed when the warm air is forced up
o Appears on the weather map as a solid purple line with alternating semicircles and triangles facing the direction it’s heading
Midlatitude CycloneüPrimary weather producers lasting from a few days to more than a weeküLarge centers of low pressure(counterclockwise movement) that move west to eastüTakes about 2 to 4 days to pass over an area
Fronts Notes.notebook December 01, 2016
ü Life Cycleo Front develops
• Two air masses move parallel to each other in opposite directions
o Wave develops o Cyclonic circulation (low pressure) develops
• Wave deepens• Convergence at the surface and divergence aloft• Warm air moves toward the pole and cold air moves toward the equator causing counterclockwise rotation
o Occlusion begins• Cold front overtakes warm front
o Occluded front develops• Stormy weather develops
o Cyclone dissipates• Temperature differences between air masses is gone• Energy source is exhausted
Fronts Notes.notebook December 01, 2016
Fronts Notes.notebook December 01, 2016
Maritime TropicalMaritime Tropical
Maritime Polar
Maritime PolarContinental Tropical
Continental Polar
Drag the Air Mass to the correct Source Region
Front Drawings for LabDraw, color, label, and explain the types of fronts (cold and warm). Make the front symbol part of the drawing. You need to include arrows showing the direction of air movement and show what the clouds look like. The explanation goes on the back of the drawing! Cold front picture is on p. 605 and warm front picture is on p. 606
