Table 3 Indices and brief descriptions of lower troposphere in each sub-period
Sub-periods | Period-I (CENS active) | Period-II (transition) | Period-III (CENS inactive) |
|---|---|---|---|
Date | 16–25 January | 26 January–04 February | 05–14 February |
CENS Index [avg] (ms−1) | −3.42 | −3.83 | −2.25 |
CENS Index [min] (ms−1) | −6.53 | −4.80 | −4.30 |
CT Index [avg] (deg.C) | 27.07 | 27.14 | 27.54 |
CT Index [min] (deg.C) | 26.78 | 26.93 | 27.35 |
Temperature | Cooler | Getting warmer | Warmer |
Zonal wind | Strong westerly | Westerly | Easterly |
Meridional wind | Most northerly | Southerly | Little northerly |
Remarks | CENS reached its maximum in the beginning of the sub-period with the lowest CT, cool atmosphere, and strong westerly wind in the lower troposphere followed by an intermittent break. | CENS started to retreat accompanied by both warmer CT and atmospheric temperature in the lower troposphere with decreasing easterly wind. | CENS mostly retreated with the warmest CT and atmospheric temperature in the lower troposphere followed by easterly wind. |