Base of an isolated thunderstorm with rain shaft on the background at the right hand side of the photo. This storm had developed locally due to lack of wind and was caused by thermal contrasts between the cold air at upper levels and warm sea surface creating lots of instability. This is a typical weather situation during Autumn. Furthermore, a funnel cloud was noticed during the storm and the weather sounding confirmed the presence of wind shear. This can be found on the first thumbnail. The second thumbnail shows a cloud to ground lightning strike. The next photo shows a Cb arcus cloud taken earlier on the same day althaugh that cloud did not produce this thunderstorm. The visible satellite imagery illustrates this isolated thunderstorm approaching Malta from the NNW side.