আবহাওয়ার ব্যাপক পরিবর্তন, প্রবল বৃষ্টিতে ডুববে বাংলার এইসব জেলা! সতর্ক করল হওয়া অফিস
আবহাওয়ার ব্যাপক পরিবর্তন, প্রবল বৃষ্টিতে ডুববে বাংলার এইসব জেলা! সতর্ক করল হওয়া অফিস
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00:00I told you that there is a synoptic situation in the Himalayas,
00:04and the most important synoptic situation is our monsoon trough,
00:10which is spread out on the surface.
00:16This spread out trough is passing through two places in the west.
00:23One is Gurulia, and the other is Shalom.
00:29After that, it got submerged in the Bay of Bengal.
00:33So, what are these monsoon troughs?
00:38What I am telling you is,
00:41whenever a monsoon trough will pass through my area,
00:46then, theoretically, every point of the monsoon trough is a low pressure center.
00:52Theoretically.
00:53Many times, we don't get it.
00:55Our observers don't get it.
00:57That is why, for a monsoon trough to exist,
01:00a small system is formed.
01:03A thunderstorm develops.
01:05You know, local thunderstorms develop.
01:07As it is low, there is a convergence.
01:09If there is a development of moisture there,
01:11then, a thunderstorm occurs.
01:14So, when a monsoon trough exists,
01:17then we get a thunderstorm.
01:19Yes, maybe we don't get a heavy thunderstorm,
01:22but we get a thunderstorm.
01:24Now, a monsoon trough exists.
01:26That is why, we are expecting widespread rainfall in the South Bank.
01:30And in the North Bank,
01:32we are expecting either fairly widespread or widespread rainfall.
01:37On the 31st,
01:39on the 31st,
01:41like I said,
01:42there is widespread rainfall in the South Bank every day.
01:44There is nothing else to say.
01:46On the 31st, in the North Bank,
01:48there is fairly widespread rainfall.
01:51On the 1st and 2nd,
01:53there is a possibility of widespread rainfall in the North Bank.
01:56On the 3rd, 4th and 5th,
01:58there is a possibility of fairly widespread rainfall in the North Bank.
02:02And on the 6th, there is a possibility of widespread rainfall.
02:05Now, the warning is like this.
02:07That, today,
02:10in all the districts of the North Bank,
02:14in all the districts of the West Bank,
02:17except Kozhbiar,
02:20there is a possibility of widespread rainfall.
02:22Except Kozhbiar, there is a possibility of widespread rainfall.
02:24And in many districts,
02:26there is a possibility of heavy rainfall.
02:29Those are,
02:31Urba and West Medinipur,
02:33Hooghly,
02:35Howrah,
02:36Urba and West Bardhaman,
02:38Nadia,
02:39Murshidabad,
02:41Birbhum,
02:42Malda,
02:43North and South Chorvis Parbana,
02:46and Nadia.
02:47In these districts,
02:48today,
02:49in isolated places,
02:51in isolated places,
02:53there is a possibility of heavy rainfall.
02:58On the 2nd,
02:59there is a possibility of heavy rainfall.
03:01Urulia,
03:04that is,
03:05there is a possibility of heavy rainfall in these isolated places.
03:09Urulia,
03:10two Bardhamans,
03:11Birbhum,
03:12Murshidabad,
03:13Darjeeling,
03:14Kalimpong,
03:15Jalpaiguri.
03:16In these districts,
03:17in different places,
03:19in isolated places,
03:21there is a possibility of heavy rainfall.
03:24And,
03:25on the 3rd,
03:26there is a possibility of heavy rainfall in isolated places.
03:31Those are,
03:32Darjeeling,
03:33Jalpaiguri,
03:34Kalimpong,
03:35and
03:36your
03:37Uttar Dinajpur district.
03:40On the 4th,
03:41in Alipur Deowar and Kozhbiar districts,
03:44in isolated places,
03:46there is a possibility of heavy rainfall.
03:51I forgot to say on the 1st.
03:53On the 1st,
03:54there is a possibility of heavy to extreme rainfall
03:59in Purvabardhaman,
04:01Hooghly,
04:02West Medinipur,
04:04and
04:05there is a possibility of heavy rainfall in all other districts of South Bengal.
04:10On the 1st,
04:11we are hoping,
04:12for this,
04:13we are attributing this low,
04:15what is it called,
04:16for cyclonic circulation.
04:19In all other districts of South Bengal,
04:21there will be heavy rainfall.
04:23There will be light rainfall in all other districts.
04:25So, in all other districts of South Bengal,
04:27our forecast is that there will be widespread rainfall.
04:29On the 4th,
04:30on the 7th,
04:31in that district.
04:33Apart from this,
04:34in some other districts of South Bengal,
04:38in isolated places,
04:40there is a possibility of heavy rainfall.
04:43And there is a possibility of extreme rainfall in heavy rainfall.
04:49In North Bengal,
04:51there will be light rainfall.
04:54It will happen every day.
04:56And in most of the places,
04:58in North Bengal,
04:59the rainfall distribution,
05:01every day,
05:02either fairly widespread,
05:04or widespread rainfall.
05:06So, there will be rainfall.
05:07But,
05:08in North Bengal,
05:09for a few days,
05:11in some other districts,
05:12in isolated places,
05:14in some other places,
05:16there is a possibility of heavy rainfall.
05:18There is a possibility of heavy rainfall.
05:22So, this is the overall forecast.
05:26So, the rainfall in South Bengal for 7 days,
05:28or the rainfall in North Bengal,
05:30or the rainfall in the whole state,
05:31what is the system like?
05:33First of all,
05:34there is no such low pressure.
05:36Like,
05:37As on today's day, we have a Cyclonic Circulation, not low, it's a Cyclonic Circulation.
05:45Cyclonic Circulation is in the upper air.
05:48It is present in Ganga and West Bengal.
05:51Normally, when Cyclonic Circulation is in the upper air, what does it do?
05:55It sucks.
05:57The air sucks.
05:59When the air sucks, some low pressure is created there.
06:02Then naturally, it converges.
06:05What does it do?
06:07The Cyclonic Circulation goes down again.
06:10It forms a low.
06:12It happens a lot.
06:14It is one of the mechanisms for the formation of low
06:20during South West Monsoon season over the Bay of Bengal.
06:24Now, there is a Cyclonic Circulation in Gangetic West Bengal
06:29and its surrounding area.
06:32That's why we expect widespread rainfall in South West Bengal every day.
06:42This widespread rainfall is called Swami Halka Manjari Vrishti.
06:47In some areas, in some days,
06:53we may get heavy rainfall or heavy to heavy rainfall.