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myrskybongarit-l [ät] ursa.fi
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Siis... Oliko Talin pyörre kiinni pilvessä vai ei? Jos ei ollut, niin
se oli todennäköisemmin puuskarintamapyörre eli gustnado. Alla NOAA:n
kuvaus gustnadosta, ja epäilen että nuo ovat Suomessa suht yleisiä.
Eli gustnado ei siis ole trombi.
t: Olli
Definition of a gustnado - A slang term for a short-lived,
ground-based, shallow, vortex that develops on a gust front associated
with either thunderstorms or showers. They may only extend to 30 to
300 feet above the ground with no apparent connection to the
convective cloud above. They may be accompanied by rain, but usually
are "wispy," or only visible as a debris cloud or dust whirl at or
near the ground. Wind speeds can reach 60 to 80 mph, resulting in
significant damage, similar to that of a F0 or F1 tornado. However,
gustnadoes are not considered to be a tornado, and some cases, it may
be difficult to distinguish a gustnado from a tornado. Gustnadoes are
not associated with storm-scale rotation (i.e. mesocyclones) that is
involved with true tornadoes; they are more likely to be associated
visually with a shelf cloud that is found on the forward side of a
thunderstorm.
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