Originally Posted by AIP Gen 3.5
12.15.3 When thunderstorms or reduced visibility due to fog, mist, dust, smoke or sand is forecast but the probability is assessed at 30% or 40%, the terms PROB30 or PROB40 are used respectively. INTER and TEMPO may also be used with a PROB for thunderstorms. If greater than or equal to 50% probability is forecast, reference is made to the phenomenon in the forecast itself not by the addition of a PROB statement.
C'mon Claret, get with the program!
