The Atlantic hurricane season officially stretches from June through November.
However, one tropical storm this century flared up in the Atlantic basin in late April.
On April 20, 2003, Tropical Storm Ana became the only tropical storm on record to form in the
Atlantic basin in April.
That early in the calendar, "April Ana" didn't form from a tropical wave coming off west Africa. It
formed as an area of low pressure aloft spinning near an old surface frontal boundary
about 250 miles west of Bermuda.
Eventually, thunderstorms began clustering near the surface low, warming and moistening
the low-mid levels of the atmosphere sufficiently enough for the National Hurricane Center to classify
the storm as Subtropical Storm Ana during the early-morning hours of April 20.
Based on microwave satellite imagery, it was estimated Ana became the first April Atlantic tropical storm of
record later on April 20, when it exhibited enough consolidated thunderstorms near the center.
http://www.weather.com/storms/hurricane/news/april-tropical-storm-ana-2003
That early in the calendar, "April Ana" didn't form from a tropical wave coming off west Africa. It
formed as an area of low pressure aloft spinning near an old surface frontal boundary
about 250 miles west of Bermuda.
Eventually, thunderstorms began clustering near the surface low, warming and moistening
the low-mid levels of the atmosphere sufficiently enough for the National Hurricane Center to classify
the storm as Subtropical Storm Ana during the early-morning hours of April 20.
Based on microwave satellite imagery, it was estimated Ana became the first April Atlantic tropical storm of
record later on April 20, when it exhibited enough consolidated thunderstorms near the center.
http://www.weather.com/storms/hurricane/news/april-tropical-storm-ana-2003
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