High Temperature at Leh
During the second half of July 2024 and first week of August saw quite high…
High Temperature at Leh
During the second half of July 2024 and first week of August saw quite high temperature over Leh arfield. This high temperature over the already rarified atmosphere created problem for aircraft operations. Maximum temperatures are shown belowon the graph from 16July2024 to 07Aug2024. Thehighest temperature 370C was seen on 29th July2024. we like to study…
Role of Tibetan Plateau and other topography in Indian weather
BY Gp Capt (Dr) B Nandi 1. Introduction Tibetan plateau has enormous impact on the weather pattern over Asia. We need to understand its role in influencing the weather so that we can forecast weather better. It towers over southwestern China at an average elevation of 4000 m above sea level and is known as “the…
Anticylone
by Gp Capt (Dr) B Nandi 1. Introduction We start by introducing the basic wind in meteorology known as geostrophic wind and then by introducing anticyclonic curvature we like to explore various properties of an anticyclone. Next step will be to go over the genesis of different types of anticyclone, gradually. 2. Geostrophic Wind Where…
VORTICITY & WEATHER
By Gp Capt (Dr) B Nandi 1. Vorticity and its relationship with divergence is best understood by Vorticity equation.one can refer any text book on Dynamic Meteorology. In cartesian coordinate (x,y,z) can be written as follows η denotes absolute vorticity. ζ denoes relative vorticity. f is the coriolos parameter. u,v and w are the component…
UPPER TROPOSPHERIC WIND IN WEATHER FORECASTING
By Gp Capt (Dr) B Nandi 1.Introduction In modern era winds are derived from cloud motion vector, especially over data sparse area. One of the methods is to use Water Vapour (WV) Channel Satellite information, especially for upper troposphere. So, there is no wonder to expect a good correlation between WV satellite image and upper…
Rajahmundry Fog
By Gp Capt (Dr) B Nandi 1.Rajahmundry is another place when morning poor visibility is common during winter. to understand occurrences we need to see the topography first. 2.Rajahmundry airport is situated East of Godavari river by about 6-7km distance and about 60 km West of Bay of Bengal. These are two major sources of…
Ageostrphic Oscillation and Nocturnal Jet
By Gp Capt (Dr) B Nandi Simplified horizontal/ two dimensional motion can be described by the following equation. Where V is the wind velocity, f Coriolis parameter, ρ air density, P pressure. k vertical unit vector. First term is acceleration of air parcel, second term is Coriolis force and third term is pressure gradient force….
Strong wind at Leh explained
By Gp Capt (Dr) B Nandi Leh is situated in Indus valley in Ladhak, a difficult terrain to access by road. Though there are two highways one from Srinagar and other from Manali. Air way is boon for Leh. Kushok Bakula Rinpoche Airport is a public use airport located 2 km southwest of Leh, a…
Diurnal variation of atmospheric stability
By Gp Capt (Dr) B Nandi 1. Introduction To study the diurnal variation of atmospheric stability, Dubai wind profiler data is chosen. It is available at hourly interval from ground to 10000 feet for every 1000ft interval. Date chosen is 16JAN2023, a clear sky day with CAVOK weather throughout the day and night with minimum…
Instability carried forward evening to morning Radiosonde profile
By Gp Capt (Dr) B Nandi 1.Introduction Usually temperature profile shows instability in the evening and stability/inversion during morning as a part of diurnal variation of stability. But there are occasions when instability of evening is carried forward to next day morning. Such occasions happened on 10JAN2024 and 11JAN2024. we need to identify the cause….
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