Fronts Flashcards
Fronts?
The transition zone between two air masses
Cause abrupt changes in temp,wind and humidity
Types of Front
Cold front
Warm front
Occluded Front
Stationary front
Trowal
Upper fronts
Cold fronts
The advancing edge of a cold air mass is known as transition zone where the cold air is replacing a warmer air mass
Before cold front passage??
Know THESE
Wind …. beginning in the south to southwest
Temperature … warm
Pressure…….falling steadily
Clouds…….. increasing cumulus, towering cumulus, and cumulonimbus
Precipitation….. short period of showers
Visibility….. fair to poor haz
Dew point….. high remains steady
Winter warm front heading from cold air to warm air?
Snow
Sleet
Freezing rain
Rain
Winter warm front heading from warm air to cold air?
Rain
Freezing rain
Sleet
Snow
when is Occluded front occurs
This happens when a cold front associated with low catches up to the warm front overtaking it and undercutting the warm front
TRoWAl is short for
TRough Of Warm Air Aloft
Trowal is?
Another name for occlusion in Canada
Need three air masses to
Form
- cold air mass
- a cool (partially mixed) air mass
- a warm air mass aloft
What’s an occlusion?
It’s a mix of the cold front and the warm front
What is a stationary front
This is a front is not moving
Winds will be blowing parallel to the front
Clouds and prolonged precipitation
Temp change
Frontogenesis
Initial formation of a front. Occurs when the temp gradient becomes sharper
Frontolysis
Should the front dissipate
Upper fronts
Form the air is trapped on the surface and the frontal weather is pushed aloft
Frontal fog
Type of fog that is associated with weather at fronts particularly warm fronts
