Cu congestus

Rare formation of a pure cumulus congestus cloud in a surface high pressure field of around 1030mb. After analyzing the weather situation, the cause of such cloud formation became quite straight forward. On the 500mb chart of the second thumbnail, a shortwave in the 576 dam line was observed to the SE of Malta. Looking at the surface wind map on the third thumbnail, a very small anti-clockwise rotating wind to the ENE of Malta could be observed signifying a very small area of lower pressure which would then lead to the ideal conditions for such photographed cumulus clouds to form despite the background of high pressure system as per fifth thumbnail. In fact, such clouds were noticed to form on the east side of the Maltese Islands and then moving westsouthwestwards. Heavy rain did not hit the Maltese Islands by a whisker on this day. The weather sounding on the fourth thumbnail indicated little instability but very light winds as to allow the warm, moist air to rise unhindered by the forcing produced by the shortwave hence favouring cumuliform cloud formation. An interesting cloud formation on the first thumbnail was the cumulus pileus. Unlike normal pileus, this was formed by the cumulus cloud breaking through a layer of already existing mid-level clouds to produce the cap within it. Such easterly winds occurring at all heights of the atmosphere is very rare for the latitudes of the Maltese Islands hence it could be said the weather scenario was very unusual weather for our Islands despite no record-breaking weather to prove this.

0 replies

Leave a Reply

Want to join the discussion?
Feel free to contribute!

Leave a Reply

Your email address will not be published. Required fields are marked *