Published: Apr 04, 2013 10:21 AM EDT

COLLIER COUNTY, Fla.- The National Park Service is working to contain a wildfire within the Big Cypress National Preserve. The exact cause of the fire is unknown and an investigation is under way to determine the origin.

It was ignited on March 29 at approximately 1:00 p.m. As of April 4, roughly 20,000 acres have been burned with 65 percent containment.

Weather conditions today will bring thunderstorms into the area, which are being monitored for potential impact to operations.

There are currently 64 personnel from various agencies committed to this incident.

The fire began just north of the Fire Prairie Trail along Turner River Road and is burning within the boundaries of Highway 29 to the west and north to Interstate 75. Weather conditions over the next several days will see fog in the early morning which could impact travel on major highways.

For information regarding road conditions please check the Florida Highway Patrol at-