#1. The condition necessary for the formation of a thunderstorm are:
A thunderstorm requires steep lapse rate, moisture, and a lifting mechanism (trigger).
#2. Hail is most likely to fall from a cloud
Hail forms in clouds with strong vertical development (cumulonimbus).
#3. Norwesters are
Norwesters are hot-season thunderstorms over NE India.
#4. Duststorm usually occurs over NW India during
Duststorms typically occur during the pre-monsoon hot period.
#5. A 'mature' thunderstorm has strong
The mature stage has both strong updrafts and downdrafts.
#6. Aircraft icing is most favoured in the cloud which have temperatures ranging between
Aircraft icing is most probable in clouds between 0°C and -20°C.
#7. A short duration, showery precipitation is associated with
Cumulonimbus clouds produce short, intense showers.
#8. Hail is
Hail forms in deep convective clouds (CB) with strong updrafts.
#9. The most hazardous cloud for variation is
Cumulonimbus clouds are the most hazardous due to turbulence, hail, and lightning.
#10. The life of a Cb cell is usually
A single cumulonimbus cell lasts about 3-4 hours.
#11. Generally the severest activity of a heat type TS is for
Heat-type thunderstorms are most intense for 30–45 minutes.
#12. Norwesters occur during
Norwesters occur during hot weather periods in NE India.
#13. Norwesters affect
Norwesters are common over Bengal, Bihar, Orissa, and Assam.
#14. The trigger action may take place due to
Thunderstorms can be triggered by orographic lifting.
#15. Norwesters normally occur during
Norwesters are mostly afternoon events.
#16. Norwesters originates over
They originate over Chota-Nagpur hills.
#17. Andhi (blinding storms) occur generally over
Andhi occurs mostly over NE India.
#18. Wind speed in Light DS is
Light duststorm wind speed is up to 21 kt.
#19. The diametre of a Microburst
Microbursts have a diameter less than 4 km.
#20. For detecting precipitation a Radar wavelength in the range _____ is suitable
Radar wavelengths 30–200 mm are suitable for precipitation detection.
#21. For airborne radars wavelength generally used
40 mm wavelength is commonly used for airborne radar.
#22. Norwesters occur during
They occur mainly during Mar-May (hot pre-monsoon season).
#23. The diameter of Microburst is
Microbursts are typically smaller than 4 km in diameter.
#24. The wavelength of TS detection X band radar is
X-band radar uses 10 mm wavelength for thunderstorm detection.
#25. The wavelength of storm detection S band radar is
S-band radar uses ~100 mm wavelength.
#26. Over plains TS mostly occur during the
Thunderstorms over plains are mostly afternoon events.
#27. Over valley and foot hills TS generally occur during
Afternoon heating triggers thunderstorms in valleys and foothills.
#28. Over the sea TS are more frequent
Sea thunderstorms peak in the afternoon due to solar heating.
#29. The life of Mesoscale Convective Complex TS is
MCCs are long-lived TS systems lasting 6–24 hours.
#30. Loud peals of thunder, frequent flashes of lightning, moderate or heavy showers accompanies by the light hail with maximum wind speed 15-40 kt is classified as
The description matches a Moderate Thunderstorm.
#31. For a severe TS one of the requirements is strong Wind Shear
Vertical wind shear helps severe TS development.
#32. Severe TS cells are tilted
Severe TS cells are vertically tilted due to wind shear.
#33. When flying through on active TS, lightning strikes are most likely
Lightning occurs in the +10°C to -10°C layer in active TS.
#34. Hazards of the mature stage of a TS cell include lighting, turbulence and;
Mature TS hazards include icing, microburst, and wind shear.
#35. Hail grows by
Hail grows mainly by collision with supercooled water drops in CB clouds.
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