The unseasonably warm weather created a flurry of activity to prepare the fire equipment in anticipation of the weekend's controlled burn. Nachusa burns typically begin in March.
With the staff committed to speaking engagements, much of the prep work fell on long–term and dedicated volunteers, Dave Crites and Mike Carr. This past week, the men worked hard and swiftly to prepare for the possible weekend burns, loading all the various equipment and pumps to the vehicles.
The burn begins, as the crew uses drip torches to ignite the grass.
Water pumpers follow the igniters and extinguish any fire that burns back toward fire breaks.
The crew has the fire well underway.
Crew members dedicated to fire suppression, put out any unwanted fire, such as around this brush pile (it will be burned later, when there is more time to watch over it).
A dust devil was observed during the burn. What causes a dust devil? McKinnon (2014) explains the interesting science:
The controlled burn is typically set in a "ring" by starting at one point and sending two crews in opposite directions, working into the wind. Near the end, the blackened area is wide enough to allow the two crews to meet up in the middle of the wind side. All the "sides" of fire meet up, and with no more fuel, the flames go out!
After the burn is complete, the Project Director leads a debriefing to go over the events of the day. What did we do well? Where can we improve?
Here is a short video detailing some typical events that occur during a controlled burn at Nachusa. For more information, visit Nachusa's webpage about controlled burns.
Today's author is Dee Hudson. Joe Richardson, Charles Larry, Kirk Hallowell, and Bill Kleiman provided the images for this post; John Schmadeke created the video.
McKinnon, Mika, (March 30, 2014).
Science of the Fiery Dust Devil Spawned by a Controlled Burn
I am a nature photographer, a freelance graphic designer, and steward at Nachusa's Thelma Carpenter Prairie. I have taken photos for Nachusa since 2012.
I have been a high school French teacher, registered piano technician, and librarian. In retirement I am a volunteer historian at Lee County Historical and Genealogical Society.
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