Brihat Samhita
सविद्युतः सपृषतः सपांशुउत्करमारुताः । सार्कचन्द्रपरिच्छन्ना धारणाः शुभधारणाः ॥ २२-०४ ॥
If on the Dhāraṇa days, the Sun and Moon should be covered by wet clouds attended by lightning and dust-storm, there will be good rain.
english translation
savidyutaH sapRSataH sapAMzuutkaramArutAH । sArkacandraparicchannA dhAraNAH zubhadhAraNAH ॥ 22-04 ॥
hk transliteration by Sanscript