Bollehenk
  • Member for 3 years, 4 months
  • Last seen more than a month ago
What's the default meaning of "Valid" in NOAA weather map?
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7 votes

Short answer: Valid just means the expected conditions at that certain time. In your example the map shows a forecast of 00 hours which is valid for 0600 UTC. Basically it means that the forecast/...

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What happens in the upper air when the altitude of the tropopause changes?
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1 votes

Short answer: I think the difference in the 2 soundings can be mostly explained by moving from one air mass (low pressure, relatively humid) to another (high pressure, relatively dry) which also ...

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