Barometer falling slowly from twelve to forty-eight hours, increasing temperature and humidity, cirro-stratus clouds moving from southwest, with easterly surface wind from one to three days in advance of storm.
Crimson sky in morning is generally followed by rain within twelve hours.
New Haven, Conn. (Furnished by Prof. E. Loomis.)
Great storms are frequently preceded by an unusually pleasant day, so that a very transparent atmosphere may, perhaps, be regarded as an indication that a storm may be looked for within twenty-four hours.
One of the first indications that we are on the edge of a great storm consists in a slight turbidness of the atmosphere which would scarcely attract the attention of an ordinary observer, but which is sufficient to cause solar halos during the day and lunar halos during the night, if there is a moon. During the colder months of the year, our great storms are usually preceded by a rise of the barometer above the mean and a veering of the wind to the northeast. If the barometer rises considerably above the mean, and is accompanied by a fresh wind from the northeast, a storm is pretty sure to follow within twelve hours.
A considerable fall of snow is very frequently preceded for several hours by the same signs (high barometer and northeast wind), together with a feeling of extreme chilliness, much greater than is usually experienced with the existing state of the thermometer.
During the warmer months a strong breeze from the south, accompanied by towering cumulus clouds, is pretty sure to be followed by rain within a few hours, generally a thunder-storm. The phenomenon which is most decidedly local in New Haven is the direction of the prevalent wind, together with the diurnal change in the wind’s direction. During the six colder months of the year the prevalent wind is from the north-northwest, and the diurnal change in the wind’s direction is slight. During the six summer months the wind in the morning usually blows from the north or northwest, but by noon, and sometimes by 10 a. m., it veers to the south or southwest, and continues thus for the remainder of the day. This peculiarity is supposed to be due to the difference of temperature between the land and the neighboring water, and it modifies, very sensibly, the direction of the New Haven wind in the neighborhood of the storm centre. During the passage of a great storm the wind at New Haven is much more northerly than is experienced at interior stations similarly situated with reference to a storm centre.
New London, Conn.
Falling barometer, rising temperature, cirrus and cirro-stratus clouds moving from the westward, light scud over the sea horizon moving with the surface wind, which is usually from the southwest. Humidity increases, and tides are of unusual height.
New Orleans, La.