| Small scale wave disturbance in the tropics, moving from east to west, with severe convective activity ahead of its trough |
| Wave-like disturbance in the monsoon regime of India, moving from east to west, with severe convective activity ahead of its trough |
| Disturbance in the higher levels associated with the equatorial easterly jet, moving from east to west, with severe convective activity in rear of its trough |
| Wave in a trade wind belt, moving from east to west, with severe convective activity in rear of its trough |
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