WEATHER UPDATE: ANOTHER AUTUMN BLAST

Thunderstorms flared up across the NW on Thursday afternoon. A number of contributing factors caused this.

Warm air built over the region thanks to a number of sunny days and light NW winds.

A pre frontal trough moved through and in the upper atmosphere temperatures dropped.

The warmer air on the surface containing enough moisture from recent rain was able to rise into the cold upper atmosphere creating enough instability to trigger the storm formation.

All this activity is a pre curser to another blast of cold polar air moving in from the South West.

This will trigger a few more showers on Friday west of the Divide.

Across the weekend expect cold nights with freezing starts about the ranges followed by fine mostly sunny days with South West winds.

Inland morning frosts will return from next week.

Another good looking weekend for Winter surfers is on the way.