“A furious squall came up and the waves broke over the boat, so that it was nearly swamped”. 
Mk 4:37 NIV 

The sea can be vicious. The sinking of the “unsinkable” Titanic is testimony to that. And the coastline of South Africa has been the graveyard of many great ships because of the furious storms that rage round the southern tip of Africa. 
Beautiful and peaceful as the Sea of Galilee appears to be it too can be treacherous. “The Lake of Galilee was notorious for its storms. They were storms which came literally out of the blue with shattering and terrifying suddenness. A writer describes them like this; ‘It is not unusual to see terrible squalls hurl themselves, even when the sky is perfectly clear, upon these waters which are ordinarily so calm. The numerous ravines which to the north-east and east debouch upon the upper part of the lake operate as so many dangerous defiles in which the winds from the heights of Hauran, the plateaux of Trachonitis, and the summit of Mount Hermon are caught and compressed in such a way that, rushing with tremendous force through a narrow space and then being sud- denly released, they agitate the little Lake of Gennesaret in the most frightful fashion” (W.Barclay, The Gospel of Mark, p113). 
Figuratively speaking there are many other kinds of storm that can scare the daylights out of us. Loss of employment can be one – from security to panic can happen in a day or two. The sudden onset of coronary problems can be another. So can the fear of a marriage falling apart. A terrible accident on the road can happen at any time. You need to make sure that Jesus is in the boat when such storms blow up . 

Lord, be with me in all the storms of life.