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…
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…
By Gp Capt (Dr) B Nandi Period chosen is 13JAN2024 to 15JAN2024 during a prolong period of fog from Punjab to Bangladesh as detected by Microphysics image. Morning extensive patch of fog image gradually dissolves during day and again starts forming in the night. Fog image of 13JAN2024 morning 0330 to 0357Z is shown below….
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…
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…
By Gp Capt (Dr) B Nandi METARs of Dehradun from 11OCT2023 to 16OCT2023 were undertaken for the study to demonstrate how useful it is to understand the atmospheric processes. Following are the METARs: 2. DEWPOINT JUMP On 11OCT2023, in half an hour (1200Z to1230Z) 3°C jump of dewpoint temperature from 15°C to 18°C has taken…
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…
By Gp Capt (Dr) B Nandi 1.Introduction. Few days we had fog over Mangalore during morning hours. 2. 10 Feb 2024 was day with fog 3. 11Feb 2024 also we had fog in the morning 4. 12Feb 2024 we did not have fog in the morning. 5.. Temperature profile for lower troposphere is given below….
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….
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…
