Based on the information below on the timing we are guessing that the loud wailing we heard this morning indicated a female lion in heat, though we'd be delighted to hear from others more knowledgeable on the subject.
"Although mountain lions may breed throughout the year, mating is believed to be most common from December to March. Young mountain lions are generally born from April to September after a gestation of 82 to 96 days (Young and Goldman, 1946; Eaton and Verlander, 1977). The usual litter consists of two to three kittens, and litters may be spaced as far as two to three years apart. The young are born in the den, but no nest is constructed."