METEOROLOGIST JEFF HABY
A pulse storm is a thunderstorm that produces strong to
severe weather in a short period of time. The
environmental conditions conducive to pulse storms are strong
CAPE and weak
wind shear. The strong
CAPE contributes to a strong
thunderstorm updraft. Strong and severe thunderstorms often have
strong updrafts associated with them. The weak wind shear is what causes the duration of the storm
to be small. Contributing to weak shear are weak upper tropospheric winds and weak winds within the
troposphere in general. Since the shear is weak, the downdraft will fall into the vicinity of the updraft and
cut off the inflow into the updraft. The downdraft will also reduce the momentum within the
updraft.
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