"The NWS has long had an extensive network of surface weather observing stations located all over the country, routinely reporting such data as atmospheric pressure, humidity, temperature, visibility, wind direction and velocity, the type and percentage of cloud cover, and the type and quantity of precipitation. Consequently, through this network, the NWS knows both what is going on now in the atmosphere at many points scattered across the country, and what has happened at these locations in the recent past. With this knowledge, they can predict with great accuracy what the atmosphere will do in the near future."
(Submitted by Noel Tue Jun 15, 2004 )
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