The weather report says it will be cloudy all weekend, with perhaps a few sporadic showers.
spora (a seed, a sowing, seed-time) (Greek)
erratic, fitful, intermittent, sporadic
sporadic== opposite of periodic, we know periodic things occur regularly. sporadic. spora (spores). spores are cells which grow irregulary, like a media plate when exposed to fungi spores, next day you will see a irregular growth. Take the first half of the word, i. e SPOR which sounds like pores. Pimples which OCCUR IRREGULARLY create pores in the skin.