What was the ISO set at? In bright sunlight follow the F16 rule. Exposure should equal speed (1/ISO) at F16. As an example if ISO is 200 then you should be exposing at 1/200th second at F16 and that should get you in the ballpark. You can adjust the ISO or F stop from that point to nail the exposure. My guess is that the ISO was set way to high and a 1 second exposure was way to long in bright sunlight.
The other thing to remember when shooting in snow is that the meter will be fooled by the amount of light reflected by the snow. You will usually want to give your shot 1 to 2 stops more exposure than the meter reads.
