What Is A Microburst?
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A microburst is a localized column of sinking air that descends from a thunderstorm and produces strong straight-line winds at the ground. The winds affect an area less than 2.5 miles across and can exceed 100 mph in severe cases. Microbursts cause damage similar to tornadoes but with straight-line wind patterns rather than rotating.
Microbursts are intense, localized downbursts of wind from thunderstorms that can cause damage rivaling tornadoes within a small area. Often confused with tornadoes due to similar damage levels, microbursts produce straight-line winds rather than rotating winds. Understanding microbursts helps explain certain aviation accidents, damage patterns that don't match tornado tracks, and why thunderstorms can be dangerous even without tornadoes.
How does a microburst form?
A microburst forms when a column of air in a thunderstorm becomes dense and sinks rapidly. The density typically comes from a combination of cooling (from evaporating precipitation or melting ice) and drag (from precipitation falling through the column). When the dense column reaches the ground, it spreads outward radially in all directions, producing strong winds at the surface. Microbursts are classified as wet (with heavy rain) or dry (with little visible rain). They typically last 5-15 minutes and affect an area 1-2.5 miles across.
What's the difference between a microburst and a tornado?
The key difference is the direction of winds. Microbursts produce straight-line winds blowing outward from a central point, like a giant invisible hand pushing down and spreading. Tornadoes produce rotating winds spinning around a central column. Damage patterns reveal the difference: microbursts knock objects outward in radial patterns from the burst center; tornadoes show convergent or rotational damage patterns. Both can produce wind speeds of 100+ mph and cause similar damage levels. Forensic damage surveys can usually distinguish the two through careful analysis of debris patterns.
How damaging are microbursts?
Microbursts can cause severe damage. Wind speeds of 100+ mph are common in strong microbursts, sometimes exceeding tornado intensity. Buildings can lose roofs, walls can be knocked down, and trees uprooted. The radial damage pattern means widespread destruction across an area rather than along a single track like a tornado. The 1985 Delta Airlines Flight 191 crash at Dallas-Fort Worth killed 137 people due to a microburst. Many storm damages initially attributed to tornadoes turn out to be from microbursts upon investigation.
Why are microbursts dangerous for aircraft?
Microbursts are extremely dangerous for aircraft, especially during landing or takeoff. When an aircraft enters a microburst, it first encounters a strong headwind (increasing apparent airspeed and lift), then suddenly faces a strong tailwind (decreasing airspeed and lift dramatically), all while encountering severe downdrafts. The combined effect can cause aircraft to lose altitude rapidly with insufficient time to recover. Several major airline crashes were caused by microbursts before modern detection systems were installed. Most commercial airports now have microburst detection radar to warn pilots.
How does a microburst form?
A microburst forms when a column of air in a thunderstorm becomes dense and sinks rapidly. The density typically comes from a combination of cooling (from evaporating precipitation or melting ice) and drag (from precipitation falling through the column). When the dense column reaches the ground, it spreads outward radially in all directions, producing strong winds at the surface. Microbursts are classified as wet (with heavy rain) or dry (with little visible rain). They typically last 5-15 minutes and affect an area 1-2.5 miles across.
What's the difference between a microburst and a tornado?
The key difference is the direction of winds. Microbursts produce straight-line winds blowing outward from a central point, like a giant invisible hand pushing down and spreading. Tornadoes produce rotating winds spinning around a central column. Damage patterns reveal the difference: microbursts knock objects outward in radial patterns from the burst center; tornadoes show convergent or rotational damage patterns. Both can produce wind speeds of 100+ mph and cause similar damage levels. Forensic damage surveys can usually distinguish the two through careful analysis of debris patterns.
How damaging are microbursts?
Microbursts can cause severe damage. Wind speeds of 100+ mph are common in strong microbursts, sometimes exceeding tornado intensity. Buildings can lose roofs, walls can be knocked down, and trees uprooted. The radial damage pattern means widespread destruction across an area rather than along a single track like a tornado. The 1985 Delta Airlines Flight 191 crash at Dallas-Fort Worth killed 137 people due to a microburst. Many storm damages initially attributed to tornadoes turn out to be from microbursts upon investigation.
Why are microbursts dangerous for aircraft?
Microbursts are extremely dangerous for aircraft, especially during landing or takeoff. When an aircraft enters a microburst, it first encounters a strong headwind (increasing apparent airspeed and lift), then suddenly faces a strong tailwind (decreasing airspeed and lift dramatically), all while encountering severe downdrafts. The combined effect can cause aircraft to lose altitude rapidly with insufficient time to recover. Several major airline crashes were caused by microbursts before modern detection systems were installed. Most commercial airports now have microburst detection radar to warn pilots.
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