During fires, a smoke twister (sometimes also called a smoke vortex or smoke whirl) is a vertical, rotating column of smoke that forms when hot air from a fire rises rapidly and begins to spin. These phenomena share similar formation principles with fire tornadoes or fire whirls, but specifically refer to the rotating column of smoke rather than actual flames.Smoke twisters form due to several factors:
- Temperature differences between the hot smoke and surrounding cooler air
- Updrafts created by the intense heat of the fire
- Wind patterns or terrain features that introduce rotation to the rising air
- Atmospheric instability
When these conditions align, the smoke can begin rotating and form a visible twisting column that extends upward from the fire. Smoke twisters are typically less intense and dangerous than fire whirls (which contain actual flame), but they demonstrate the powerful convection currents generated during fires.
These phenomena can be observed in both wildland fires and structure fires when conditions are right. Firefighters sometimes use these visual indicators to help assess fire behavior and air movement patterns.
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