Brihat Samhita
नीलोत्पलालिभिन्नाञ्जनत्विषो मधुरराविणो बहुलाः । तडिदुद्भासितदेहा धाराअङ्कुर वर्षिणो जलदाः ॥ ३२-२१ ॥
Clouds of the colour of the blue lotus, of the bee and of collyrium, sounding agreeably, in masses and attended by lightning, will yield sharp rain.
english translation
nIlotpalAlibhinnAJjanatviSo madhurarAviNo bahulAH । taDidudbhAsitadehA dhArAaGkura varSiNo jaladAH ॥ 32-21 ॥
hk transliteration by Sanscript