Concerns are rising in California that an upcoming heatwave could increase the rate of melting of the huge Sierra Nevada snowpack - boosting the chances of more flooding in certain areas as May approaches.
Floods are worrying those in the Central Valley among other areas, though there are no flood risks for the Bay Area which is expected to see mid-week temperatures hitting as high as 32C (90F).
Climate scientist with UCLA, Daniel Swain, warned on Monday, April 24: "The big melt is now here. This is that week."
