Robert Griffin III (Chris O”Meara/The Associated Press)

The field conditions appear relatively good Sunday morning at FedEx Field. But with more rain in the forecast, there seems to be a chance that those conditions could deteriorate as the day progresses.

The question is whether that could affect the outcome of the Washington Redskins’ 1 p.m. game against the unbeaten Atlanta Falcons.

The conventional thinking is that poor weather or field conditions generally serve as an equalizer and favor the lesser team. That would seem to be the Redskins, who have a 2-2 record and are trying to break a seven-game home losing streak that dates to last season. The Falcons, at 4-0, are one of the league’s three undefeated teams.

Truly bad conditions could hinder the Falcons’ greatest advantage. They have the league’s top-rated passer, Matt Ryan, going against a Redskins secondary that has held only one opposing quarterback to fewer than 300 passing yards this season—and that was a 299-yard outing a week ago by Tampa’s Josh Freeman. But the Falcons also have a productive running back in Michael Turner and can turn to him if needed.

The Redskins have run the ball well with rookie tailback Alfred Morris, aided by the rushing of quarterback Robert Griffin III. Coach Mike Shanahan said Friday he has seen Griffin throw the ball in rainy conditions and believes the rookie can handle that task well.