If the warm air mass is unstable, mixing of the warm moist air will produce thunderstorms that are embedded among the stratiform clouds ahead of the front, and after frontal passage, thundershowers may continue.
12.
The same frontal passage that brought us the damaging winds has picked up a lot of dust over the west of New South Wales and visibility was down to below a kilometer ( half mile ) in some parts,
13.
He assisted helped out at the national gliding and soaring contest in New York, where Dupont made a distance record for the United States by using Namias's forecast of a strong frontal passage to glide all the way to Boston.
