The warmer airmass that was coming would mark a positive change in the weather.
The word airmass is a singular noun. The plural is airmasses.
Air does not remain in a given place. A country does not have an 'airmass'.
"The air mass moved north over the Pacific"
it become a storm
An airmass that is very warm and dry would be very light and have a tendency to rise up.
Compared to a maritime tropical airmass, a maritime polar airmass has lower temperature and less water vapor.
It is cold and dry.
It affects the temperature and Humidity of a climate...(marintime airmass is develping and being moved with winds that carry water vapor and are being deposited over the continental airmass)
An airmass source region is an extensive area of the earth's surface over which bodies of air remain for a sufficient time to acquire characteristic temperature and moisture properties imparted by that surface.
airmass
airmass
An occluded front is when a warm air mass is caught between two cooler air masses.1. Cold occluson : If the airmass of the advancing cold front is colder than the cool airmass of the warm front, the advancing cold front undercuts and lifts both the warm and cool airmass of the warm front. The weather is initially warm front type but during the passage of front, showery weather of cold front occurs. This occlusion is comon in summers. 2. Warm occlusion : When the airmass behind the advancing cold front is less colder (cool) than the cold airmass of the warm front ahead, the advancing cold front overrides the warm front aheaad. The weather in such a case is similar to that of warm front. This type of occlusion occurs in winters and is less common.