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jet stream
(redirected from Subtropical jet stream)

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jet stream

Narrow band of very fast wind (velocities of over 150 kph/95 mph) found at altitudes of 10–16 km/6–10 mi in the upper troposphere or lower stratosphere. Jet streams usually occur about the latitudes of the Westerlies (35°−60°).

The jet stream may be used by high flying aircraft to speed their journeys. Their discovery of the existence of the jet stream allowed the Japanese to send gas-filled balloons carrying bombs to the northwestern USA during World War II.



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No one seems to agree why it occurs - according to meteorologist Philip Eden, possible contributing factors include the retreat of snow and ice from northern Canada and the shift of the subtropical jet stream over Asia - but records suggest that, on average, it happens in seven out of every 10 years.
Bastardi forecasts a wetter-than-average swath from southern and central California to the southern Plains and Southeast and up the East Coast, because an expected active subtropical jet stream will send storms on a track across the southern U.
Monday's storm was caused by a warm subtropical jet stream and a cold subartic jet stream zigzagging over the United States, creating volatile weather wherever they collided.
 
 
 
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