A secondary discontinuity when crossing a front is what?
A temperature change
What type of front produces the most hazardous weather?
Fast moving cold front
How far in front of a front can squall lines form?
50-300 miles
Stationary fronts develop when the cold and warm fronts slow to what speed?
Less than 5 knots
What is an occlusion?
When a fast moving cold front totally lifts a warm front off of the ground.
What forms with the temperature and dew point are equal?
Clouds and fog
On clear nights the heat of the earth quickly radiates off into space. As the ground cools off the air just above it fog is formed. What is this kind of fog called?
Radiation fog
When warm air flows over a cold surface fog can form. What is this type of fog called?
Advection Fog
When air is forced to rise up a mountain slope fog can form. What kind of fog is this?
Upslope fog
Cold air from land moving over warmer water can cause what type of fog?
Steam Fog
What kind of clouds are thunderclouds?
Cumulonimbus
What is the first stage of a thunderstorm?
Cumulus stage which has continuous updrafts
What is the second stage of the thunderstorm?
Mature stage is when the rain begins to fall. It is the MOST DANGEROUS and is characterized by a cauliflower shape.
What is the third stage of a thunderstorm?
The dissipating stage characterized by the anvil shaped cloud.
What severe wind conditions are associated with thunderstorms?
Severe up and down drafts, wind sheer.
Where are the most intense thunderstorms found?
In squall lines.
Gust fronts lead what type of storm?
Thunderstorms
What is a reasonable safe distance to stay away from thunderstorms?
20 miles
What weather convective activity causes both horizontal and vertical wind sheer?
Microburst
What visual clue is there for a microburst when there is little or no precipitation?
A ring of blowing dust.
Do microbursts happen singularly or in groups?
multiple microburst typically happen
A weather factor that causes a momentary change in altitude and or attitude is called what?
Light turbulence
Large and abrupt changes in altitude and or attitude, along with large variations in airspeed is called what?
Severe turbulence
Moderate turbulence is similar but has greater intensity than what?
Light turbulence
What is necessary for ice to form on an airplance?