0 Bft calm
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|from: Sep 22 2021 8:00 am||until: 14:00||Beach Hazards Statement level: Moderate|
|Possible threat to life or property - responsive action should be taken soon (within next hour)|
|...BEACH HAZARDS STATEMENT IN EFFECT FROM 8 AM THIS MORNING TO 2 PM EDT THIS AFTERNOON... * WHAT...Dangerous swimming conditions are expected due to high wave action and strong rip currents. * WHERE...Marquette and Alger Counties. * WHEN...From 8 AM this morning to 2 PM EDT this afternoon.|
forecast based on: pressure: 1025.4 hPa - trend: 0 (no change) - max: 1038.6 - min: 987.5
wind from: NE (English)
month: 9. 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