When do low pressure systems start in Jordan?

Arab Weather - Low pressure systems in Jordan typically begin with the onset of the rainy season, but their arrival timing varies from year to year. In some years, the first low pressure systems form in late September, while in other years they begin in early November. In still other years, the first low pressure systems arrive in December, while in some cases, their arrival is delayed until February, as was the case last season.

Climatic factors affecting the arrival of low-pressure systems in Jordan

Arab Weather meteorologists said that several weather factors affect the extent to which low-pressure systems reach Jordan, the most important of which are:

1- Location of the jet stream:
The jet stream is a fast-moving path of wind in the upper atmosphere that directly controls the path of low-pressure systems.

2- Arctic Index (AO):

The Arctic Oscillation Index (ASI) is an indicator used to measure the intensity of low-pressure systems over the Arctic. Whenever the index is positive, it means that the low-pressure systems over the Arctic are intensifying and the polar vortex is stable. When the index is negative, it means that a high-pressure system has formed over the Arctic and that the polar dome has collapsed.

3- North Atlantic Orbiter (NAO):
The NAO index measures the atmospheric pressure differences between Iceland and the Azores. Negative values help push low pressure systems toward the Mediterranean and Middle East, while positive values tend to push them northward.

4- Location of the Siberian High:
The winter Siberian High represents an extremely cold high-pressure area. If this high expands westward, it could block low-pressure systems and prevent them from reaching our region.

And God knows best.