Weather maps archive

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Using guide

Weather map archive offer you query the previous forecast images of 7Timer!, however because there is limited disk spaces, we have these limit: 1. Day up to April 16, 2006; 2. Only World-wide images available; 3. Only cloud cover and transparency images available; 4. Only forecast within +30-hour available.

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Cloud Cover

Overcast

90% covered

80%covered

70% covered

60% covered

50% covered

40% covered

30% covered

20% covered

10% covered

Clear

The explanation of Cloud Cover Forecast is shown upon, according to the different sky color in different weather conditions, we use a 11-lever system for Cloud Cover Forecast. The Clear Sky Clock may put the high cloud too much. When the 7Timer! says it's "overcast", this overcast maybe very thin, thin enough to see the moon, planet or stars. It also could miss the smog near the ground. And it could not always give the exact time of the time those clouds/holes pass, and it may miss the thunderstorms in summer.

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Transparency

Very Poor

Poor

Average

Good

Excellent

The explanation of Transparency Forecast is shown upon, we use a 5-lever system for Transparency Forecast. The Transparency discuss here includes atmosphere humidity and smog effect. The smog might have a bigger effect on transparency, e.g. in cities, the smog refract the lights and might makes the condition worse, than it in countryside. We'll discard the transparency output if the cloud cover is greater than 30%.

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Wind Speed

Calm

Light

Moderate

Strong

Storm

According to the Beaufort Wind Scale, we use a 5-lever system for Wind Speed Forecast, they are: Calm (<1.5m/s), Light (2-5m/s), Moderate (5-11m/s), Strong (11-17m/s), Storm (>17m/s).

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Humidity

<29%

30%-35 %

35%-40%

40%-45%

45%-50%

50%-55%

55%-60%

60%-65%

65%-70%

70%-75%

75%-80%

80%-85%

85%-90%

90%-95%

95%-99%

100%

The Relative Humidity can show the difference value between temperature and dew point. If the Relative Humidity is high, the dew will comes out much more easier. Though, the Humidity can change in a small region, e.g. in the mountains the Humidity may be higher than expect, so please notice this effect.

If you feel there're some other elements need to be forecast, feel free to write me by the feedback form.