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Sky conditions are estimated in terms of how many eighths of the sky are covered in cloud, ranging from 0 oktas (completely clear sky) through to 8 oktas (completely overcast). In addition, in the SYNOP code there is an extra cloud cover indicator '9' indicating that the sky is totally obscured (i.e. hidden from view), usually due to dense fog ...
Starlight overcast moonless night sky [1] 140 microlux: Venus at brightest [1] 200 microlux: Starlight clear moonless night sky excluding airglow [1] 10 −3: 1 millilux: 2 millilux: Starlight clear moonless night sky including airglow [1] 10 −2: 1 centilux: 1 centilux: Quarter Moon 10 −1: 1 decilux: 2.5 decilux: Full Moon on a clear night ...
The average cloud cover of the Earth, 2005-2013. Colors range from blue (no clouds) to white (totally cloudy). [6] (click for more detail) Cloud cover values only vary by 3% from year-to-year averages, whereas the local, day-to-day variability in cloud amounts typically rises to 30% over the globe.
Near perfect weather is on tap for Halloween festivities tomorrow. Clear skies with late afternoon temperatures in the 70s quickly cooling into the 50s and 60s over the course of the evening.
SUNDAY: Cloudy Morning. Then, Clearing. High 79. Wind S 10-15. SUNDAY NIGHT: Increasing Clouds. Low 63. Wind S 10-15.MONDAY: Mostly Cloudy. 40% Chance of Showers & Thunderstorms. High 79. Wind S ...
The total solar eclipse is just days away and the cloud cover forecast is looking grim for some regions, but there’s still hope because not all cloudy skies are the same. Why a cloudy forecast ...
AM 1.5 global solar spectrum sunlight (= 1,000.4 W/m 2) [3] [circular reference] 20,000 lux: Shade illuminated by entire clear blue sky, midday 1,000–2,000 lux: Typical overcast day, midday 400 lux: Sunrise or sunset on a clear day (ambient illumination) <200 lux: Extreme of thickest storm clouds, midday 40 lux: Fully overcast, sunset/sunrise ...
That said, Reiff says the ability to view an eclipse during cloudy weather depends on the extent of the clouds. “If there’s widespread thunderclouds, I’m going to stay where I am,” she says.