National Weather Service forecaster Christopher Bannan says one of those bands late Friday morning passed over the agency's Slidell office, where the storm brought a wind gust of 25 mph (40 kph).
Bannan says the primary concern of forecasters in Louisiana remains the heavy rainfall and potential for significant flooding.
About a third of an inch of rain had already fallen at the weather service's Slidell office before noon Friday.
Forecasters say Barry could dump 10 to 20 inches (25 to 50 centimeters) of rain across a swath of Louisiana including New Orleans and Baton Rouge.
Since Hurricane Katrina, groups of Louisiana residents calling themselves the Cajun Navy have used their own boats to rescue people from floods in Louisiana, Texas, Florida and other states.
The founder of one such group, United Cajun Navy, tells New Orleans station WWL-AM that many Louisiana members are scrambling to protect their homes as Tropical Storm Barry approaches, so out-of-state members are heading to Louisiana to be ready. Todd Terrell says the group has volunteers from seven states.
Terrell says members have been working to fill sandbags in the Baton Rouge area. He says his goal was 5,000 sandbags in three days and they'd filled three times that in a day-and-a-half.
He says they're also delivering sandbags to people who are handicapped, veterans, or disabled, and cannot get sandbags themselves.
The Rolling Stones have postponed their New Orleans concert as Tropical Storm Barry approaches the area, but the group's website says the show will go on a day later.
The concert had been scheduled for Sunday after the group's appearance at the New Orleans Jazz and Heritage Festival earlier this year was canceled so singer Mick Jagger could get medical treatment.
The message on the rock group's website says fans should hold on to their tickets because they will be honored the next day.
The slow-moving storm is prompting fears of flooding in the region. Hurricane warnings are in effect along the Louisiana coast. The storm's center is expected to come ashore Saturday.
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