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1-7 day forecast for snow via 850 hPa temperatures


































Source: Wetterzentrale


White lines & values = height of 850 hPa in geopotential decameter (gpdam) (every 2 gpdam).
Black lines and colored zones & = temperature at 850 hPa in deg C (thin line every 1C, thick line every 5C).

Some critical values of 850 hPa temperatures in maritime airflow.

For Low Countries: usually  -7C or below risk for wintry precipitation (in continental airflow wintry ppn may start from  -2C). 
For Ardennes: usually -3C or below risk for wintry precipitation.



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