What are West African Squall Lines (or Disturbance Lines) and how do they propagate across Ghana?

1. Organized lines of thunderstorms that move from East to West, causing high winds and heavy rain
2. Localized sandstorms that blow from West to East across the coastal plains
3. A series of high-altitude clouds that remain stationary over Kumasi
4. Rotating cyclonic storms that move northward from the Gulf of Guinea