The Environment Agency's new site, which uses postcodes to identify specific areas, had 200,000 page impressions within the first 10 hours of its launch at midnight on Thursday.
That figure is the equivalent of an average month's traffic to the site.
The agency has issued 36 flood warnings for 21 rivers across western parts of the country.
Gale force winds of more than 80mph are expected in some areas "with some structural damage possible", the Met Office said.