Western disturbances occur during the cold, dry season. As a consequence such floods have incurred damages to sources of livelihood earnings, infrastructure and even human casualties. The other type of cyclone is an extratropical or mid-latitude cyclone. Traveling cyclones generally move from west to east. Traveling cyclones usually develop along the main fronts of the troposphere, which have originated earlier; they are wave-like disturbances as the air flows along both sides of the front.
In the upper reaches, the flash flood characteristics dominate, while in the lower river floods governs the scene. The weather disturbances are the Depression , Tropical Storm,Typhoon,Tornadoes,Hurricane,Thunder Storms , and Lighting Depression - The maximum wind speed is less tha 63km Tropical Storm -The maximum wind speed 63-118km Typhoon -The maximum wind speed is 18km Tornadoe s- Des … tribution whirling wind occurring with a funnd-shape cloud. For instance, a hurricane that strikes a major urban area will likely do more damage than a large Category 5 hurricane that strikes a mostly rural region. The leeward side, however, receives little rain. In the free atmosphere, above the boundary layer, which is approximately the first 1,000 m, the air moves approximately along the isobars, deflecting from the pressure gradient at an angle close to 90° to the right in the northern hemisphere and to the left in the southern hemisphere; this occurs as a result of the Coriolis force and the centrifugal force that arises during movement along curved trajectories.
Cyclones in which the gas enters axially are also used. Therefore, it demands timely and accurate prediction. When western disturbances move across northwest India before the onset of monsoon, a temporary advancement of monsoon current appears over the region. Within the region a tropical cyclone is defined as being a non frontal synoptic scale cyclone, that originates over tropical or subtropical waters with organized convection and a definite cyclonic surface wind circulation. As a result of the vortical air movements, air masses of different temperatures from different latitudes of the earth are drawn into the cyclone region. The catchment area which contributes water and debris to the lake is 170 km2. The moisture is carried in the upper atmosphere in stead of lower atmosphere driven by the westerlies.
The scale used to classify systems in the is defined by for use in various French territories, including and. Office of the Federal Coordinator for Meteorological Services and Supporting Research. Not only that but they can hurl objects in the air causing damage and even small thing that get hurled can do damage. Out of these, the stormiest months are May, June, October and November. The moisture laden winds arrive on the western coast of India from the south western side and cause heavy rainfall on the windward side of the Western Ghats.
. The eye is surrounded by an inner circle of intense winds and rotating cloud mass. During 1999 the categories Very Severe Cyclonic Storm and Super Cyclonic Storm were introduced, while the severe cyclonic storm with a core of hurricane winds category was eliminated. Extratropical storms are a global, rather than a localized, phenomena with moisture usually carried in the upper atmosphere unlike tropical storms where it is carried in the lower atmosphere. . To contribute in this issues analysis is conducted considering the event occurred in Bangladesh during 16-17 February 2013.
Unlike tropical cyclones, mid-latitude cyclones often form in cold environments and over land. These cyclones are generally accompanied by anticyclones. We found evidence for a period of increased surface water mixing, which we suggest was related to a strengthened winter monsoon with a peak intensity over 200 years from 4. In the case of the subcontinent, moisture is sometimes shed as rain when the storm system encounters the Himalayas. Movement in the opposite direction, that is, from east to west, is rare. Helen laughed heartily, disturbing all of her friends. In the northern hemisphere, where tropical cyclones occur in the Atlantic Ocean, Caribbean, and eastern Pacific Ocean they are called hurricanes and those in the Pacific Ocean west of the 180 th meridian are called typhoons.
In the concluding stage, a cyclone may remain immobile for a long time. The presense of water springs towards the downstream side of the natural dam also indicate the presence of hidden channels passing through the dam which may weaken the shear strength of the dam. Rainfall in winter months December, January and February in Bangladesh are very occasional. Are Western Disturbances important for Rabi crops? Due to this event, huge loss to agricultural and horticultural crops occurred in several parts of India. This generates favorable conditions for in the upper atmosphere, which promotes the formation of an -moving. They usually influence the weather of the north-western regions of India. There could be three reasons for this— i waters in the Bay of Bengal are comparatively shallow; ii the coastline along the Bay of Bengal is more complicated; and iii more number of rivers drains into the Bay of Bengal than into the Arabian Sea.
The quasistatic models make use of horizontal resolutions of the order of 50 km or larger and can resolve mesoscale phenomena whose scale is of the order of a few hundred kilometers. An increase in the prevailing night temperature generally indicates an advance in the arrival of these cyclones disturbances. Tropical cyclones originate over the Bay of Bengal and the Indian ocean. As the hot air rises more warm, moist air rushes in to fill the area left vacant by the hot air. During summer in the Indian subcontinent, the large landmass gets heated up more rapidly than the neighbouring seas.