To the astonishment of forecasters, a tiny hurricane just sprang up near Cuba
Briefly

Satellites cannot directly measure wind speeds, relying instead on estimates from instruments like scatterometers. Oscar's winds were estimated at 48-63 mph, below hurricane status.
Forecasters were shocked by Oscar's rapid development. They had observed only modest indications from satellite imagery and believed it would be hindered by wind shear.
Oscar's size played a critical role; weather models struggle with small hurricanes. They can develop quickly outpacing the predictions due to their efficient organization.
The tiny hurricane is forecasted to bring significant impact, with heavy rain and winds expected in eastern Cuba, followed by storm effects in the Bahamas.
Read at Ars Technica
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