I came across the following sentence in a Wikipedia article English Conditional Sentences. It is classified as a first conditional:-
"If it rains this afternoon, your garden party is doomed. (deduction placed in the present)"
I'm really clueless how this one becomes first conditional; my gut feeling is that the sentence to be first conditional should end up for a possible future event as follows:-
(If it rains this afternoon,) your garden party will be doomed...
Does grammar allow us to use the simple present tense to mark a deduction?