Tonight, I am publishing my initial forecast in what I consider to be the competitive U.S. House of Representatives and Senate races for 2016. Starting September 11, I will publish updated ratings every Sunday between now and the election.

There are few real surprises. At this time, I am forecasting a net Democratic gain of five seats in the Senate, which would flip the chamber to Democratic control, 51-49. I also forecast a Democratic gain of 13 seats in the House, which would recover the ground the party lost in 2014 and narrow the Republican advantage to 234-201.

Two ratings that stand out include the Senate race in Nevada and a House race in the 49th District of California. At this point in time, I am rating Catherine Cortez-Masto a slight favorite to hold outgoing Democratic leader Harry Reid‘s Senate seat in Nevada. Republican Joe Heck appears to have a slight polling lead, on average, but I continue to expect we will see high Latino turnout, and that the vaunted Reid political machine will pull out a close victory for the longtime Senator’s preferred successor.

I also am rating Democrat Douglas Applegate as a slight favorite to upset Congressman Darrell Issa in what has long been a Republican district in Southern California, centered in south Orange County, the epicenter of GOP politics in the state. Applegate has been polling very well in this race against the controversial Issa, and also performed well in the open primary pitting all candidates against each other in June. With higher turnout to be expected in November, the signs at this time point to an upset. Stay tuned.

For the full chart of competitive races and their ratings, click here.