| They are practically the same, except when eddies exist, caused by obstacles |
| They have the same direction, but the surface wind is weaker, caused by friction |
| The surface wind is veered compared to the wind at 3000 feet and is usually weaker. |
| The wind at 3000 feet is parallel to the isohypses and the surface wind direction is across the isobars toward the low pressure and the surface wind is weaker. |
EN 