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Advanced Forecasting

If you have a weather station, and a barometer, you can begin undertaking advanced weather forecasting. There are local conditions that effect local weather everywhere, and it takes a lot of experience to understand those factors. The following list is a general forecasting tool you can use to begin your forecasting efforts. Be sure to write your forecasts in a weather log.

·        If the wind is from the southwest to the northwest , and the barometric pressure is between 764.54 to 767.08 mm (30.10 and 30.20 inches), and steady, the weather will be fair, with slight temperature changes, for one or two days.

·        If the wind is from the southwest to the northwest, and the barometric pressure is between 764.554 to 767.08 mm (30.10 and 30.20 inches), and rapidly rising, the weather will be fair and probably followed with in two days by rain.

·        If the wind is from the southwest to the northwest, and the barometric pressure is 767.08mm (30.20 inches) or above and steady, the weather will continue to be clear, and there will be no significant change in temperature.

·        If the wind is from the southwest to the northwest, and the barometric pressure is 767.08mm (30.20 inches) or above, and falling slowly, the next two days will probably see fair skies and slowly rising temperatures.

·        If the wind is from the south to the southeast, and the barometric pressure is between 764.54 to 767.08 mm (30.10 and 30.20 inches), and falling slowly, you can expect rain with in 24 hours.

·        If the wind is from the south to the southeast, and the barometric pressure is between 764.54 to 767.08 mm (30.10 and 30.20 inches), and falling rapidly, the winds will increase and rain will be likely with in 12-24 hours.

·        If the wind is from the south to the northeast, and the barometric pressure is between 764.54 to 767.08 mm (30.10 and 30.20 inches), and falling slowly, there will mostly likely be rain in 12-18 hours.

·        If the wind is from the south to the northeast, and the barometric pressure is between 764.54 to 767.08 mm (30.10 and 30.20 inches), and falling rapidly, the winds will increase and rain will be likely with in 12 hours.

·        If the wind is from the east to the northeast, and the barometric pressure is 764.54 mm (30.10 inches) or below, is falling rapidly, and it is summer, there will be light winds and rain may not fall for several days. If it is winter, you can expect rain with in 24 hours.

·        If the wind is from the southeast to the northeast , and the barometric pressure is 762mm (30 inches) or below, and falling slowly, rain will probably continue for one or two days.

·        If the wind is from the southeast to the northeast , and the barometric pressure is 762mm (30 inches) or below, and falling rapidly, there will be rain and high winds, followed with in 36 hours by clearing. In the winter, temperatures will fall noticeably.

·        If the wind is from the south to the southwest, and the barometric pressure is 762mm (30 inches) and rising, the weather will most likely clear within a few hours and be fair for several days.

·        If the wind is from the south to the east, and the barometric pressure is 756.92mm (29.80inches) or below, and falling rapidly, severe storms are imminent, the weather will clear in about 24 hours, and in the winter, it will be colder.

·        If the wind is from the east to the north, and the barometric pressure is between 756.92mm (29.80 inches) or below, and falling rapidly, there will be severe northeast winds and heavy precipitation. In the winter, there will be heavy snow followed by a cold wave.

Provided by the Smithsonian Institution Smart Labs Weather Kit