Transcript 403.12
Turbulence is an irregular motion of air resulting from “eddies” and vertical currents. Can cause light bumps or loss of control. Regional Gliding School Mechanical Turbulence (eddies) Friction between the air and the ground from irregular terrain and man-made obstacles, causes eddies. Thermal Turbulence Happens on hot sunny days when the sun heats the earth’s surface unevenly. Isolated convection currents are set in motion and this results in turbulence. Frontal Turbulence The lifting of the warm air by the sloping frontal surface and friction between the two opposing air masses produce turbulence in the frontal zone. Wind Shear Marked changes in wind direction and speed either vertical or horizontal. If the change in wind is great you can expect severe turbulence. Regional Gliding School Light Momentary slight changes in altitude and/or attitude or a slight bumpiness. Occupants may feel a slight strain against their seat belts. Moderate Occupants will feel a definite strain against their seat belts and unsecured objects will be dislodged. Severe Large and abrupt changes in altitude and/or attitude and usually, large variations in indicated air speed. The airplane may momentarily be out of control. Extreme Airplane is tossed about violently and is impossible to control. May cause structural damage. Regional Gliding School NOTE: You must use the buttons in the Confirmation Stage Regional Gliding School Meteorology Turbulence & Weather Signs Let's try a few review questions on Meteorology: Question #1 - Regional Gliding School Friction between the air and the ground, especially irregular terrain and man made obstacles is known as . A Mechanical Turbulence B Thermal Turbulence C Frontal Turbulence D Wind Shear Flying Scholarship Program I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program That answer is correct. Let's move on... Meteorology Turbulence & Weather Signs Let's try a few review questions on Meteorology: Question #2 - Regional Gliding School The irregular motion of air resulting from "EDDIES" and vertical currents is known as . A Mechanical Turbulence B Thermal Turbulence C Frontal Turbulence D Turbulence Flying Scholarship Program I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program That answer is correct. Let's move on... Look For Unsettled Weather When: • barometer is falling • temperature at night is higher is than usual • clouds move in different directions at different levels • cirrus clouds increase. A large ring appears around the sun or moon and stays there until the overcast clouds thicken and obscure the sun or moon • summer afternoon clouds darken Regional Gliding School Look For Steady Precipitation When: • there have been signs of unsettled weather • the wind is southeast to northeast and the pressure is falling. Rain or snow within a day if the pressure is falling slowly. If falling rapidly, rain or snow soon, with strengthening winds. Regional Gliding School Look For Showers When: • cumulus clouds develop in a westerly wind • cumulus clouds develop rapidly in spring or summer early afternoon Regional Gliding School Look For Clearing Weather When: • the barometer rises • wind shifts into west or northwest • the temperature falls Regional Gliding School Look For Continued Bright Weather When: • • • • • • sun sets like a ball of fire barometer is steady or slowly rising afternoon cloudiness decreases after 3PM to 4PM morning fog breaks within two hours after sunrise light breeze from west or northwest there is a red sunset Regional Gliding School NOTE: You must use the buttons in the Confirmation Stage Regional Gliding School Meteorology Turbulence & Weather Signs Let's try a few review questions on Meteorology: Question #3 - Regional Gliding School What weather can you expect when the barometer is falling? A Unsettled Weather B Steady Precipitation C Clearing Weather D Showers Flying Scholarship Program I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program That answer is correct. Let's move on... Meteorology Turbulence & Weather Signs Let's try a few review questions on Meteorology: Question #4 - Regional Gliding School What weather can you expect when the sun sets like a ball of fire? A Unsettled weather B Continuing bright weather C Clearing weather D Showers Flying Scholarship Program I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program That answer is correct. Let's move on... Meteorology Turbulence & Weather Signs Congratulations!! You have now completed the Turbulence & Weather Signs lesson of the Meteorology Module. Of course, this lesson is always available to you for future reference if required. You are now ready to move along to the next Meteorology lesson you have not completed or to any other module you wish. You can advance to the Self Test Module if you feel ready to challenge the final exam. Good Luck! Regional Gliding School