Abstract
Daily and 3-hourly weather information in code figures and daily rainfall data from 19 stations in Bangladesh for the months of March through May, from 1983 through to 1992, have been analysed to give some understanding to the space/time distributions as well as to the nature of the thunderstorms throughout the country. The Statistical characteristics of these disturbances are presented. It turns out that over Bangladesh thunderstorm (TS) occurrence has a wide variation in terms of both space and time. Whereas in Syihet TS. days make up 50% of the premonsoon season, in Maijdee they comprise only 10%. However, in Maijdee precipitation per TS day is abnormally high. In central Bangladesh, the most dominant time of TS occurrence is either late afternoon or early evening, unlike that in the north where the corresponding time is either night or early morning. In general, the frequency of TSs as well as the amount of precipitation are greatest in the month of May almost all over the country with the average rainfall per TS day being quite high though dry TS days are still quite numerous.
Highlights
Bangladesh is a land of rivers and branching of these rivers and the canals is widespread throughout the country (Figure 1) leading to the conclusion that, to a large extent, they control the weather and climate of the country
Bangladesh falls within the Indian southwest monsoon system, and the surface winds during the monsoon time are SW /SISE, though the upper wind remains westerly
The subtropical high shifts to the Bay of Bengal with two other heat lows falling around Bangladesh
Summary
Bangladesh is a land of rivers and branching of these rivers and the canals is widespread throughout the country (Figure 1) leading to the conclusion that, to a large extent, they control the weather and climate of the country. The TS activity in the Bangladesh region is supposed to have three distinct causes: In the southern part, as stated previously, the surface wind during the premonsoon period is SW/S in general. As the downdrafts meet the sea moisture-laden SE surface winds of the region, successive TS developments occur It appears as if the disturbances are propagating from the NW direction, resulting in the premonsoon TS activity in Gangetic west Bengal being popularly known as Nor'westers (local name of SLS). The study has essentially been confined to the three-month period before the onset of monsoons i.e. March, April and May
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