Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 11 · Rain, Kurma Chakra, Utpata
वृष्टिः कूर्मचक्रम् उत्पाताश्च
कन्योदये प्रभिन्ने चेत्सर्वदा वृष्टिरुत्तमा ।अहिर्बुध्न्यं पूर्वशस्यं परशस्या च रेवती ॥ ७३२ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 732.
If Virgo is split at the rising, the rain is always the best. Uttara Bhadrapada gives an early crop. Revati gives a later crop.
Simple meaning: Virgo split at the rising brings the best rain. Uttara Bhadrapada gives an early crop and Revati a late one.
भरणी सर्वसस्या च सर्वनाशाय चाश्विनी ।
Bharani is good for all crops. Ashvini can harm them. Venus 7th from Jupiter, in the west, comes next.
तदातिवर्षणं भूरि प्रावृट्काले बलोज्झिते ।
Venus in the 7th from Jupiter brings very heavy rain. A halo around the Moon is the next sign.
विद्युत्प्रपूर्णमंडूकास्वनावृष्टिर्भवेत्तदा ।
A Moon halo with lightning and croaking frogs brings rain. Clouds leaning west come next.