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Cloud-cover symbols used on weather teleprinters and aviation reports in the US [6] In the early 20th century, it was common for weather maps to be hand drawn. The symbols for cloud cover on these maps, like the modern symbols, were drawn inside the circle marking the position of the weather station making the measurements.
They forecast the cloud cover, transparency and astronomical seeing, parameters which are not forecast by civil or aviation forecasts. [1] They forecast hourly data, but are limited to forecasting at most 48 hours into the future. Each individual chart provides data for only a 9 mile radius, and so are essentially point forecasts.
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. Land is generally covered by 10-15% less cloud than the oceans, because the seas are covered with water, allowing for more evaporation .
Cloud cover forecasts will also be important for locations outside the path of totality, given that at least 99% of the contiguous U.S. will get to experience at least a partial eclipse.
The NWS' map on sky cover for April 8 shows cloud cover getting worse the further northeast you go, like in Muncie and Richmond. Clouds do look slightly calmer in western Illinois and Missouri ...
Burlington, Vermont, is forecast to have 15% cloud cover on Monday afternoon. The city has 3 minutes, 19 seconds in totality during Monday's eclipse. Cleveland, which is supposed to get about 3 ...
This allows map users to analyze patterns in atmospheric pressure, temperature, wind speed and direction, cloud cover, precipitation, and other parameters. [1] The most common station plots depict surface weather observations although upper air plots at various mandatory levels are also frequently depicted.
Much of Texas, considered prime eclipse-viewing territory by many traveling there for the occasion, was predicted in forecast models on Friday to have cloud cover of 60%-80% on eclipse day.