The characteristics and climatology of funnelclouds in alaska were examined using operational radiosondes, surface meteorological observations, and reanalysis data. funnelclouds occurred under weak synoptic forcing ...
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The characteristics and climatology of funnelclouds in alaska were examined using operational radiosondes, surface meteorological observations, and reanalysis data. funnelclouds occurred under weak synoptic forcing between May and September between 11 am and 6 pm alaska Daylight Time with a maximum occurrence in July. They occurred under Convective Available Potential Energy >500 J·kg-1 and strong low-level wind shear. Characteristic atmospheric profiles during funnelcloud events served to develop a retrieval algorithm based on similarity testing. Out of more than 129,000 soundings between 1971 and 2014, 2724, 442, and 744 profiles were similar to the profiles of observed funnelcloud events in the Interior, alaska West Coast, and Anchorage regions. While the number of reported funnelclouds has increased since 2000, the frequency of synoptic situations favorable for such events has decreased.
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