(A) Criteria for describing activity of southwest monsoon

Notes:

1. While describing the activity of the monsoon:
1. The normals of stations, whenever available should be used.
2. Till normals for all the stations are available the following procedure should be adopted:

    Number of stations in a sub-division with normals  - a
    Normal for these stations -  b
    Average normal for the sub-division -  b/a
    Total number of stations reporting rainfall  - c
    Actual total rainfall reported by these stations  - d
    Therefore, the average rainfall for the sub-division -  d/c
    Compare d/c with b/a and describe the activity of the monsoon accordingly, other conditions being fulfilled.
   													

2. In the sub-divisions, where the percentage of hill stations is high, the hill stations must be also taken into account for describing the activity of the monsoon. In other sub-divisions, the hill stations will be excluded.
3. The monsoon activity will be described in all the sub-divisions of northeast India as is done for sub-divisions of other regions.
4. The monsoon activity need not be described over the Bay Islands and the Arabian Sea Islands.

(B) Criteria for describing the activity of Northeast Monsoon.