Southeast storms are preceded by rapidly falling barometer, rising temperature, increasing cloudiness and humidity, wind backing to an easterly direction from the southwest or west, and cirro-stratus clouds moving from the west or northwest.
Northeast storms by high and rising barometer, falling temperature, increasing haziness, cirro-stratus clouds moving from the southwest, with light winds veering to the northward and variable.
Southwest storms by falling barometer, high temperature, and fair weather. Thunder-storms by low or falling barometer, unusually high temperature, cumulus clouds in western horizon, wind shifting suddenly from south or southwest to the northward.
GENERAL PHENOMENA.
1. Sky becoming overcast with cirro-stratus clouds moving from the southwest, west, or northwest.
2. Increasing haziness, especially in the upper atmosphere after a spell of fair weather.
3. Halos and corona.
4. Variable light wind veering and backing frequently, with a tendency to an easterly direction.
5. Sun setting red among threatening clouds or giving the horizon a greenish tinge.
6. Heavy dews in summer.