As the worst of it passes, the sky will lighten, the air will be colder and the storm will give way to lighter rain and eventually high cirrus clouds and then clear skies. Warm fronts bring warm, moist air that rides gradually up over the top of the cooler air ahead. Because of this gradual approach, storms associated with the actual frontal boundary may be several hundred miles behind the wispy cirrus clouds, which are the first indication that the front is approaching. The cloud sequence that indicates an approaching warm front begins with very high cirrus and proceeds to lower and lower cloud decks that become increasingly dark, finally bringing rain from low nimbostratus clouds. First, keep your eye on the sky.
Violent weather has a way of being very localized.
Monitor temperature, humidity and barometric pressure. If humidity is high and the temperature is falling, you're heading for the dew point, which means fog, heavy dew or other forms of precipitation are likely to follow. If the barometer is rising, more stable weather is coming. A falling barometer, conversely, indicates the approach of more variable weather. A falling barometer in conjunction with rising humidity is the kind of condition that accompanies tropical storms and hurricanes.