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|from: Jan 23 2019 12:00 am||until: 12:00 pm||Winter Weather Advisory level: Minor|
|Minimal threat to life or property - Responsive action SHOULD be taken soon (within next hour)|
|...LIGHT FREEZING RAIN TONIGHT MAY CAUSE TRAVEL ISSUES FOR SOME AREAS NORTHWEST OF INTERSTATE 85... .Light precipitation will overspread the area from the southwest tonight. In locations where surface temperatures fall below freezing tonight, this precipitation will occur as freezing rain. A light accumulation of ice may cause treacherous road conditions|
Forecast based on: Pressure: 1034.9 hPa - Trend: 0 (No change) - max: 1039.6 - min: 998
Wind from: SW (English)
Month: 1. Hemisphere: 1 (Northern).
|This program tries to get a "same result forecast" as when using the
1915 Negretti and Zambra (Zambretti) Forecaster.
The original paper forecaster was designed for the Northern Hemisphere and UK "Weather Range". ie. The nearer the Poles the greater the spread between lower and upper barometer levels and large "trends" are needed for weather conditions change.
Conversely, the nearer the Equator the smaller the "spread" and smaller "trends" for change.
On the left a picture of the original weather prediction disc.
A forecast at approx. 09:00 local Solar Time is allegedly better than 90% accurate ! - even though it takes no account of rate of barometer change, wind speed or temperature.
More information can be found here: drkfs.net