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A sudden drop in temperature.
Not always, you need to take barometric pressure into account, the sudden drop signifies that a new weather system has moved in, whether it is high or low pressure will determine whether it is good or bad
None. It can be a sign of instability in the upper atmosphere, so, a sign of possible weather to come (from different cloud).
The change of color may be a sign of a chemical reaction.
plus sign
a sudden drop in the temperature
A fall in pressure.
A sudden drop in the temperature
A sudden drop in the temperature
A sudden drop in temperature.
A sudden drop in the temperature
A sudden drop in temperature.
A sudden drop in the temperature
Not always, you need to take barometric pressure into account, the sudden drop signifies that a new weather system has moved in, whether it is high or low pressure will determine whether it is good or bad
Temperature dropping is a sign of weather change .
Some clues that the weather is changing would be clouds rolling in. The air will smell different even. You can hear thunder. Wind will start blowing.
"Trees wearing a faint tint of green"