A mesoscale low-pressure center. Severe weather potential often increases in the area near and just ahead of a mesolow. Mesolow should not be confused with mesocyclone, which is a storm-scale phenomenon.
MESOLOW (OR SUB-SYNOPTIC LOW)
Meaning of MESOLOW (OR SUB-SYNOPTIC LOW) in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012