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444789

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Posted: 13 years ago

#241

Raindrops have sizes ranging from 0.1 to 9 millimetres (0.0039 to 0.35 in) mean diameter, above which they tend to break up. Smaller drops are called cloud droplets, and their shape is spherical. As a raindrop increases in size, its shape becomes more oblate, with its largest cross-section facing the oncoming airflow. Large rain drops become increasingly flattened on the bottom, like hamburger buns; very large ones are shaped like parachutes.^[22] Contrary to popular belief, their shape does not resemble a teardrop.^[23] The biggest raindrops on Earth were recorded over Brazil and the Marshall Islands in 2004 — some of them were as large as 10 millimetres (0.39 in). The large size is explained by condensation on large smoke particles or by collisions between drops in small regions with particularly high content of liquid water.^[24]

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Shruti

@shruti

Alumni

+ 9

Posted: 13 years ago

#242

We completed more than 20 pages of this thread. Merry, Sidra and rest wud be surprised😆😆

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444789

Suspended

Posted: 13 years ago

#243

Intensity and duration of rainfall are usually inversely related, i.e., high intensity storms are likely to be of short duration and low intensity storms can have a long duration.^[25]^[26] Rain drops associated with melting hail tend to be larger than other rain drops.^[27]Raindrops impact at their terminal velocity, which is greater for larger drops due to their larger mass to drag ratio. At sea level and without wind, 0.5 millimetres (0.020 in) drizzleimpacts at 2 metres per second (4.5 mph) (2 m/s or 6.6 ft/s), while large 5 millimetres (0.20 in) drops impact at around 9 metres per second (20 mph) (9 m/s or 30 ft/s).^[28] Thesound of raindrops hitting water is caused by bubbles of air oscillating underwater.^[29]^[30] The METAR code for rain is RA, while the coding for rain showers is SHRA.^[31]

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Shruti

@shruti

Alumni

+ 9

Posted: 13 years ago

#244

Does Shilpu, Arpu, Niki, Anu come here?

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444789

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Posted: 13 years ago

#245

Stratiform (a broad shield of precipitation with a relatively similar intensity) and dynamic precipitation (convective precipitation which is showery in nature with large changes in intensity over short distances) occur as a consequence of slow ascent of air in synoptic systems (on the order of cm/s), such as in the vicinity of cold fronts and near and poleward of surface warm fronts. Similar ascent is seen around tropical cyclones outside of the eyewall, and in comma-head precipitation patterns around mid-latitude cyclones.^[32] A wide variety of weather can be found along an occluded front, with thunderstorms possible, but usually their passage is associated with a drying of the air mass. Occluded fronts usually form around mature low-pressure areas.^[18] What separates rainfall from other precipitation types, such as ice pellets and snow, is the presence of a thick layer of air aloft which is above the melting point of water, which melts the frozen precipitation well before it reaches the ground. If there is a shallow near surface layer that is below freezing, freezing rain (rain which freezes on contact with surfaces in subfreezing environments) will result.^[33] Hail becomes an increasingly infrequent occurrence when the freezing level within the atmosphere exceeds 11,000 feet (3,400 m) above ground level.^[34]

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444789

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Posted: 13 years ago

#246

Convective rain, or showery precipitation, occurs from convective clouds, e.g., cumulonimbus or cumulus congestus. It falls as showers with rapidly changing intensity. Convective precipitation falls over a certain area for a relatively short time, as convective clouds have limited horizontal extent. Most precipitation in the tropics appears to be convective; however, it has been suggested that stratiform precipitation also occurs.^[32]^[35] Graupel and hail indicate convection.^[36] In mid-latitudes, convective precipitation is intermittent and often associated with baroclinic boundaries such as cold fronts, squall lines, and warm fronts.^[37]

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Reshu

@-x-Reshu-x-

Stunner

+ 6

Posted: 13 years ago

#247

haaye haaye ye majburi ye mausam aur ye duri

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444789

Suspended

Posted: 13 years ago

#248

Orographic precipitation occurs on the windward side of mountains and is caused by the rising air motion of a large-scale flow of moist air across the mountain ridge, resulting in adiabatic cooling and condensation. In mountainous parts of the world subjected to relatively consistent winds (for example, the trade winds), a more moist climate usually prevails on the windward side of a mountain than on the leeward or downwind side. Moisture is removed by orographic lift, leaving drier air (see katabatic wind) on the descending and generally warming, leeward side where a rain shadow is observed.^[16]