Because - they're unpredictable and almost impossible to forecast. They're also invisible - meaning there's no way to avoid them.
Microbursts are spawned by heavy to severe thunderstorms (if the microburst results in strong enough winds, the thunderstorm will become severe by definition).
Doppler weather radar is used to detect microbursts. This radar technology can identify the presence of strong downdrafts associated with microbursts by measuring the velocity and direction of wind. By analyzing these radar data, meteorologists can issue timely warnings to help prevent potential hazards to aviation and other affected areas.
Microbursts are more common. Most wind damage from thunderstorms comes from microbursts, and damaging wind is the most common type of severe weather report. By contrast only about 10% of severe thunderstorms produce tornadoes.
Microbursts are typically more intense and localized compared to macrobursts. Microbursts affect a smaller area with higher wind speeds concentrated in a short duration, making them potentially more dangerous for aviation. In contrast, macrobursts cover a larger area with less intense but longer-lasting wind impacts.
Downdrafts are damaging winds on or near the ground. They are called downbursts or microbursts if caused by a thunderstorm which they usually are
Dan D. Vicroy has written: 'Microburst vertical wind estimation from horizontal wind measurements' -- subject(s): Wind shear, Microbursts (Meteorology), Microbursts, Atmospheric models, Radar measurement, Wind velocity measurement, Vertical air currents, Downburst, Aviation meteorology
Microbursts occur when the evaporation of rain within a thunderstom cools the air, causing it to lose buoyancy. The air then descends rapidly. When it reaches the ground it spreads out, producing strong, sometimes damaging, winds.
No there isn't. Microbursts are not all that uncommon, and they usually occur in the same season, increasing the liklihood they would occur near the same time of the year. And if the climate in one area permits microbursts, then it isn't surprising that they will occur more than once.
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