It means the wind is blowing from the southwest.
Strong wind from the tropics, the Gulf, that blows to the Northeast. Opposite of the North (cold) winds....
Mizen Head.
Southwesterly
It runs in a southerly to southwesterly direction.
The prevailing winds in Moscow, Russia are southwesterly, and southerly.
Chinook
You would travel in a southwesterly direction to go to Melbourne from Canberra.
When flying from England to Brazil, you'd be flying in a southwesterly direction.
The Darling River flows in a southwesterly direction from southern Queensland through western New South Wales into the Murray River.
The Ohio River forms the southern boundaries of Ohio and Indiana. It begins at the Ohio-Pennsylvania border. It flows southwesterly between Ohio and Kentucky, Indiana and Kentucky, and continues to the Mississippi River.
Kyushu is the 3rd largest island located in Japan and the most southwesterly of its 4 main islands. The sort of jobs that are available in Kyushu are factory, teaching, and restaurants.
Yes, it enters the Pacific Ocean by way of the Sea of Cortez.