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- Definição1
- A strong downdraft which induces an outburst of damaging winds on or near the ground.
- Fonte1
- FEDERAL AVIATION ADMINISTRATION. Pilot/controller glossary (P/CG). 2014. Disponível em: https://www.faa.gov/air_traffic/publications/atpubs/pcg/inde x.htm. Acesso em: 10 jun. 2014.
- Nota adicional1
- Damaging winds, either straight or curved, are highly divergent. The sizes of downbursts vary from 1/2 m i le or less to more than 10 mi les. An intense downburst often causes widespread damage. Damag- ing winds, lasting 5 to 30 minutes, could reach speeds as high as 120 knots.
- Nota adicional2
- To create a downburst at the ground, the downward (downdraft) speeds in the thunderstorm must be unusually high, and this downward flowing air must penetrate close to the ground. These conditions can be met when rain falls through an atmospheric layer with relatively low humidity.
- Contexto
- It is not necessary for the thunderstorm to produce hail or tornadoes to produce a downburst. Damage from downbursts can be so severe that it is mistaken for tornado damage. When examined, however, the damage pattern from a downburst will be either straight-line or divergent, indicating the winds were flowing outward, rather than in a circular, converging pattern as in the case of a tornado. Downburst damage can cover hundreds of square miles, or be limited to a single field (the smallest ones are called "microbursts").
- Subárea1
- Meteorology
- Related Term
- microburst
- Português
- downburst
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