Moreover consider the weather forecast. Here are a couple of samples.
Under its influence, rain/thundershower would occur at most places with heavy to very heavy falls at a few places and isolated extremely heavy falls (≥25 cm) over north Tamil Nadu and Puducherry during next 24 hours and at most places with isolated heavy to very heavy falls over Rayalaseema and South Coastal Andhra Pradesh during the same period.
Rain/thundershowers at most places with heavy to very heavy falls at a few places would occur over South Interior and Coastal Karnataka during next 48 hours. Isolated extremely heavy falls would also occur over south Interior Karnataka during next 24 hours
UNDER ITS INFLUENCE, RAIN/THUNDERSHOWER AT MOST PLACES WITH ISOLATED HEAVY TO VERY HEAVY FALLS WOULD OCCUR OVER SOUTH INTERIOR AND COASTAL KARNATAKA DURING NEXT 24 HOURS.
Apart from the completely arbitrary use of lower and upper case, it seems to me that the IMD has a simple algorithm of concatenation of phrases. These are of two kinds a) (light, moderate, heavy, very heavy, extremely heavy, isolated extremely heavy) rain and b) (few, some, many, most) places. Combine one phrase from a) and another from b) and you have got a prediction, even though in actual content it leaves the hapless residents in those places totally at sea (regrettably sometimes literally).
Surely Mausam Bhavan and our own Chennai weather forecasting stations under S. R. Ramanan are capable of somewhat more precise forecasting? A lot of it appears to be lazy thinking. If you say isolated rain in some areas, moderate in a few, heavy in isolated pockets, you have covered most possibilities and nobody can accuse you of having got it wrong. I think our weather men could try a little harder in this day and age.