Occlusion: Cold Conveyor Belt Type

• Cloud Structure In Satellite Images
• Meteorological Physical Background
• Key Parameters
• Typical Appearance In Vertical Cross Sections
• Weather Events
• References
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• Special Investigations:
  • • T-Bone

Weather Events

Parameter	Description
Precipitation	Intensive precipitation within and especially ahead of the occlusion point. Rain bands typically oriented parallel to the occluded front (5-10 km wide).
Temperature	Rising temperature associated with the passage of the secondary occlusion.
Wind (incl. gusts)	Strong winds circulating around a secondary vortex, veering of the wind associated with the passage of the secondary occlusion.
Other relevant information	The rear part of the cloud spiral (close to occlusion point), often situated to the left exit region of a jet streak, is ripe for convective development due to a potentially unstable troposphere.

27 October 2019, 12UTC: IR + synoptic measurements (above) + probability of moderate rain (Precipitting clouds PC - NWCSAF)
Note: for a larger SYNOP image click this link.

The synoptic measurements correspond very well to the schematic representing the ideal situation. Many stations report precipitation, but the higher intensity can be found more in the CF-WF area than in the occlusion spiral. Showery precipitation and Cb reports are associated with the ccb spiral closest to the CF-WF boundary and less intensive rain is associated with the southwestern part of the occlusion spiral. This corresponds to the values of PC (probability of moderate precipitation) which are low but have higher values in this area

27 October 2019, 12 UTC
1st row: Cloud Type (CT NWCSAF) (above) + Cloud Top Height (CTTH - NWCSAF) (below); 2nd row: Convective Rainfall Rate (CRR NWCSAF) (above) + Radar intensities from Opera radar system (below).

For identifying values for Cloud type (CT), Cloud type height (CTTH), precipitating clouds (PC), and Opera radar for any pixel in the images look into the legends. (link).