Cumulus clouds over the Maltese Islands with moderate height development due to very cold pool of air from a closed upper-level low over the Central Mediterranean. This cold air was funneled in through the Rhone Valley after persisting over Northwest Europe for several days. Such thermal swings is normal for Spring in the Mediterranean Region althaugh this particular airmass was somewhat colder than usual. At the time a Force 7 NW wind was blowing over the Islands. The first thumbnail indicate the day`s air profile clearly showing low-level steep lapse rate due warm ground cold air interaction. The second thumbnail indicates the closed upper-level low mentioned earlier with the third and fourth thumbnails showing the visible satellite image and freezing level respectively which all combine with the second thumbnail as clouds developed around this upper low. The fifth thumbnail indicates the very strong Mistral current on the day.