extratropical low

extratropical low

[¦ek·strə¦träp·i·kəl ′lō]
(meteorology)
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and becoming an extratropical low over the DelMarVa peninsula.
Over the next two days, this extratropical low (a low pressure system that exhibits many of the characteristics of a migratory frontal cyclone--but at middle or higher latitudes) drifted northwestward into Canada.