Amritavarshini is a Raga related to rain.
In the samashti charanam we can see it's mention like suvrishti hetave which means reason behind good rains and in the last line we can see the pleading note salilam (water) varshaya (please shower)

Lyrics:
Anandamritakarshini Amritavarshini
Haraadi poojithe shive bhavani

Sreenandanaadi samrakshani
Sree Guruguha janani chidrupini

Sananda hridaya nilaye sadaye
Satya suvrishti hetavetwam
santhatham chinthaye amriteswari
salilam varshaya varshaya varshaya

s,, g,, mp nisanipa mgmg
s,, p,, n, snsg sgmg
sg, mp, gm, pn, pnsg
s,,n p,,m g,, snpmg