Air Masses and Fronts
This type of front affects local weather for long periods, sometimes days
Stationary
Cumulus clouds and thunderstorms are typically associated with this type of turbulence
Convective
The two visual indications of microbursts
Virga, and blowing dust rings
A TAF forecasts for this distance around the airfield
5 SM
The three types of airmets
Tango, Zulu, Sierra
The type of precipitation associated with warm fronts
Steady
Airflow disrupted by terrain or manmade obstacles is this type of turbulence
Mechanical
The three phases of a thunderstorm
Cumulus, Mature, Dissipating
temperatures in wind aloft forecasts above this flight level are automatically negative
FL 240
Volcanic ash/tropical cyclones can trigger a sigmet that is valid for __ hours
6
The most dangerous weather is associated with this type of front
Warm Front Occlusion
Temperature inversions typically cause this
Windshear
The diameter of microbursts are typically less than
2.5 miles in diameter
Winds/temp aloft forecasts are issued this many times per day
2
A tango airmet can be issued when surface winds are sustained above this speed
30 knots
Fronts occur at the boundaries of these
Two air masses
These three types of clouds are commonly associated with mountain wave
Lenticular, Rotor, Cap
Updrafts in supercells can reach up to this speed in FPM
9000
Surface analysis charts are issued every ___ hours
3
Sierra airmets are issued when ceilings and visibility are less than ____ & ____ over ___% of an area
1000 ft, 3 sm, 50 %
This type of air mass is associated with warm moist air
Maritime tropical
CAT is often found on this side of the jet stream core
Cold side
This percent of supercells produce tornados
25%
This observation is included in AWOS III but is not included in AWOS II
Ceiling information
convective sigmets can be issued when a severe thunderstorm is potentially producing at least one of these three things
Surface winds greater than 50 kts, tornados, hail greater than 3/4 inches.