No warning or flashing on vulched field

[lambo31]

I went to a field that was not flashing but had a large nme dar bar in the same sector thinking there was a raid coming in. Little did I know it was already there. I upped from the hanger without checking things out from the tower assuming the field wasn't being attacked since it wasn't flashing on the map and was quickly vulched. After I was sent to tower I double checked the map and sure enough, still no flashing. Not even an alarm was sounding.

Lambo

[Blooz]

When a field has taken alot of damage it won't flash or give the siren warning anymore.

I'm not sure at what level this happens but I do know that when the manned AAA is down it won't give an alert.

Maybe somebody can help me here to explain it further.

Good idea to always take a look around from the tower to make sure you're not jumping into a vulture situation (if living is your thing).