Once a thousand year rainstorm

News item:
"A day after a once-in-a-thousand-year rainstorm, southern Appalachia
faces Hurricane Helene
Helene could dump 6 to 12 more inches of rain in areas that have just
recently been deluged. "
https://www.nbcnews.com/science/environment/day-thousand-year-rainstorm-southern-appalachia-faces-hurricane-helene-rcna172895
More frequent once a thousand year rainstorm is supposed to be cause by
global warming.
Question:
Would global warming bring more or less water/ice to the Himalayas
region?