According to the winter forecasts by the U.S. National Oceanic and Atmospheric Administration, or NOAA, El Nino will have a strong impact on the entire Western Hemisphere through at least February.  Here's what could impact your travel, according to the experts. 

Southern California/Pacific Coast...Possibility of Heavy Rains

Dangers in The Deserts...Possible Flooding

Possible Epic Snow in Lake Tahoe

Wet Gulf Coast

Smooth Sailing in The Caribbean

Sun & Swell Surfing in Hawaii

Of course, these are just projections, predictions.  If you are booking trips, perhaps look into trip insurance.  In other words weigh the options if it's really worth it.