What is "microbursts"

Usage examples of "microbursts".

And already, virgas of rain were hovering over the landscape, evaporating as quickly as they fell, blasting the ground with localized microbursts that uprooted trees, flattened fields, and peeled the roofs off trailers.

Using every meg of his computational abilities, Mahnmut gauged the vectors involved and jetted over to the upper hull, all ten jets firing in microbursts to adjust his dangerous trajectory, until he was within a meter of the hull.