Question

Which is the month of cyclonic rainfall?
(A) October
(B) November
(C) December
(D) January

Answer 1

Hint: A tropical cyclone rainfall climatology is established to govern rainfall features of previous tropical cyclones. A tropical cyclone rainfall climatology can be used to benefit forecast present or imminent tropical cyclone effects. The degree of a tropical cyclone rainfall effect is contingent upon rapidity of movement, storm size, and degree of plumb wind clip.

Complete answer:
Frontal rainfall is the outcome of frontal systems neighbouring extratropical cyclones or lows, which develop when warm and tropical air meets cooler air. Frontal rainfall usually falls out of nimbostratus clouds. When multitudes of air with dissimilar densities (moisture and temperature features) convene, the less impenetrable warmer air supersedes the deeper colder air. The warmer air is enforced to ascent and, if circumstances are accurate, generates an upshot of inundation, causing rainfall. In turn, rainfall can augment the temperature and dewpoint distinction along a frontal border. Transient weather fronts frequently result in abrupt variations in environmental temperature, and in turn the moisture and pressure in the air at ground level.

Thus, option (B) is correct.

Note: Warm fronts happen where warm air thrusts out a formerly existing cold air mass. The warm air supersedes the cooler air and travels skyward dud. Warm fronts are trailed by prolonged stages of light rain and trickle owing to the fact that, after the warm air upsurges above the cooler air (which stays on the ground), it steadily cools owing to the air's extension while being elevated, which forms clouds and steers to rainfall. Cold fronts happen when a build of cooler air removes a build of warm air. This kind of change is severer, as cold air is more dense than warm air. Rainfall period is frequently briefer and usually more powerful than that which happens ahead of warm fronts.