Proper continental style in situ convection and single cell storms today. I missed them all but I love this kind of thing. They bubble up quickly in the heat, glaciate, big downburst and heavy rain or hail, then clear up as fast as they came. Much better than your grey, overlong, high based Spanish plume affairs.
Yes, these are typically low-based direct convective type storms, formed from strong surface heating usually peaking around 4 pm. There is strong diurnal variation with these storms, once the land cools convection stops. The air aloft must have been quite dry if I'm correct, aiding quick evaporation & dispersal. No direct convection occurs over the much cooler seas & the windward coasts continues to enjoy prolonged sunshine (but could also be foggy), whilst massive Cu con & Cb clouds tower inland.
On contrast, high base Spanish plume type storms are generally not formed from direct convection, but rather when the lower, humid troposphere becomes overheated during prolonged heatwave, & the cold air aloft starts making inroads from the Atlantic where the hot lower troposphere starts to convect into. Similarly, high base storms also occur when a tongue of hot, humid lower troposphere intrudes into areas of cold upper troposphere.
These storms show little diurnal variation. In fact the convective activity tends to peak on average about midnight. They can also develop over cool seas, even in foggy conditions, latter giving rather bizarre experience.
Edited by user
21 July 2021 09:58:15
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