|from: Jun 3 2020 6:39 am||until: 7:15 am||Special Weather Statement level: Minor|
|Minimal threat to life or property - Responsive action SHOULD be taken soon (within next hour)|
|...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN ERIE AND SOUTHEASTERN NIAGARA COUNTIES... At 638 AM EDT, a strong thunderstorm was located near Grand Island, moving east at 50 mph. Wind gusts up to 50 mph are possible with this storm, along with brief, torrential rainfall.|
Unsettled, probably improving
Forecast based on: Pressure: 1006.4 hPa - Trend: 1 (Rising) - max: 1046.4 - min: 990.2
Wind from: W (English)
Month: 6. 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