COULD OCCUR = Probability of occurrence between 00 to 25% MAY OCCUR = Probability of occurrence between 26 to 50% WOULD OCCUR = Probability of occurrence between 51 to 75% WILL OCCUR = Probability of occurrence above 75% VERY LIGHT RAIN = 0.1 - 2.4 mm LIGHT RAIN = 2.5 -7.5 mm MODERATE RAIN = 7.6 - 35.5 mm RATHER HEAVY = 35.6 - 64.4 mm HEAVY RAIN = 65.5 - 124.4 mm VERY HEARY RAIN = 124.5 - 244.4 mm