Through lines pseudo fronts

Trough line are elongated area of relatively lower pressure, often without a strong temperature contrast like a front represented by orange barbed lines with barbs pointing toward the pressure fall side.

Through line overs France, 14 August 2025

The orange barbs are heading towards left and right. 

So how this differs from an occluded front with blue triangles and red circles alternating in purple colours?

Adriatic micro-scale drivers

In addition to synoptic scale situation modified by mesoscale contributions, sailors in the Adriatic should consider the micro-scale drivers that may affect their exposure to local weather conditions while in anchorage. 

Anchoring in Borovinje, in a cove supposed to be protected from Bora NE winds.   

These factors may result from the local geography resulting in very local anabatic and katabatic winds as already mentioned in mesoscale drivers. However, these mesoscale drivers may be expressed at very different scales at the local level, not always captured on the local weather forecast. 

Several effect are influencing these factors...