MeteoGroup forecaster Callum Stewart agreed that a warm air mass
from Spain is forecast to send temperatures well above average.
The chief forecaster said: "A mild and moist westerly flow, associated with a frontal zone and warm air mass
is expected to persist through the weekend.
There is first of all the original cold air mass to the north of the front, a warm [air] mass to the south of the front with a stable air mass that is drier and warmer aloft over the warm air mass
Colby Neuman, also a meteorologist at the National Weather Service, said the warmer temperatures have been persistently high because of a warm air mass
that is stuck above the Willamette Valley.
On Tuesday and Wednesday, the impact of the warm air mass
will gradually recede making the weather relatively hot in most regions of the Kingdom and hot in the desert, Jordan Valley and Aqaba.
Temperatures soared again during the last week of July, as a second warm air mass
moved over the island.
However, the department anticipated that the situation would improve by the end of this month as the cold air mass from China is expected to meet the warm air mass
in Thailand and cause rain nationwide.
The north-west and west will have more cloud and a bit more moisture but the warm air mass
is staying over Scotland.
But the warm air mass
produced by the heat-wave in Russia speeded up the jet stream, and on the other, more air drew upwards in the area over Pakistan.
According to the PME office, there are warm air mass
and northern winds near Iraq and Kuwait, which will eventually cause temperatures to soar in Saudi Arabia.
Cold front: where chilly air moves in beneath a warm air mass
, displacing it.
Temperatures shot up sharply on Saturday in many parts of Japan as a warm air mass
flowed in from the south, with the mercury reaching record highs for February at more than 100 locations throughout Japan and levels typically seen in July in a few cities.