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5 votes
3 answers
642 views

What's the default meaning of "Valid" in NOAA weather map?

NOAA weather forecast maps often include a valid time period, e.g: "valid from time1 thru time2." However, many maps only indicate a single time, e.g: "valid time1." In the ...
Dyneken's user avatar
  • 53
4 votes
1 answer
143 views

What exactly is an "upper air station"?

What exactly is an "upper air station"? I know they release radiosondes and manage the resulting data, but how does that occur? I notice that some seem to be at universities. Does the National ...
Tyler Durden's user avatar
  • 1,804