Update, 6 p.m.: The Nationals e-mailed a news release at 5:52 p.m. with more details about the postponement. From the news release:

Due to the amount of rain that has already accumulated on the field, and the expectation of additional rain tonight, the field conditions are not playable or safe for tonight’s game.

The team will play a traditional, single-admission doubleheader tomorrow, Thursday, September 8, beginning at 1:05 p.m. The second game will follow approximately 30 minutes after the completion of the first game.

All tickets for tonight’s game must be exchanged at the Nationals Park Box Office for seats of equal or lesser value for tomorrow’s doubleheader or any remaining home game during the 2011 regular season*. Tickets for tomorrow’s 1:05 p.m. game will be valid for both games of the doubleheader.

The Nationals Park Box Office will open tomorrow at 9:00 a.m. and Center Field Gates will open at 10:30 a.m.

Update, 5:38 p.m.: Gene Wang (@gene_wang) just tweeted: “Rizzo just said game cancelled #Nats”. Adam Kilgore clarifies that it is postponed. Doubleheader tomorrow. Chien-Ming Wang is expected to start the first game at 1 p.m. and Ross Detwiler is expected to start the second game.

Update, 5:13 p.m.: The Nationals (@Nationals) tweeted at 5:03 p.m.: “Gates open at Nationals Park for Nats-Dodgers game. We’ll continue to monitor weather w/updates here & nationals.com”

Update, 4:07 p.m.: GM Mike Rizzo just texted that the game is not officially rained out.

Update, 4 p.m.: There is some confusion about whether the Nationals and Dodgers will play, or attempt to play, tonight – even among the teams involved.

The Nationals and Dodgers agreed earlier today to postpone tonight’s game and play a doubleheader involved, and the Dodgers, on their official Twitter feed, announced that as the plan.

But MLB stepped in and told the teams to wait and try to play the game. The league did not want possible rain tomorrow to prevent the teams from playing, because the Dodgers will not have a chance to make the game up.

Nationals General Manager Mike Rizzo was speaking with MLB official Joe Torre at about 4 p.m. about the status of the game.

Meanwhile, the Dodgers just showed up at Nationals Park. Fans will have a hard time getting to the park with closures on 395 and 14th Street. Stay tuned. When we have more information, we’ll provide it.

Original post: Tonight’s Nationals and Dodgers game has been postponed, according to the Dodgers’ official Twitter feed. The teams will play a traditional doubleheader tomorrow at 1 p.m. Chien-Ming Wang will start the first game for the Nationals, and Ross Detwiler will pitch the second.