A current of air.
- Hail showers are quite common over the British Isles in westerly and northerly airstreams in spring.
- They occur from July to September, when changing airstreams draw moisture-laden currents from Mexico tot he dry Southwest.
- The moist yet cool south-west airstreams undercut the dry and hot continental air, leading to vigorous and deep convection.
Definition of airstream in:
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