OTX 29 July 2026 at 0600 UTC (11:00 PM PDT on July 28), for Spokane, Washington.
The red temperature trace in the lowest part of the sounding increases with height through roughly the lowest 50–100 hPa (approximately the lowest 500–1000 m). This is a classic radiation inversion.
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OTX Sounding

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OTX 29 July 2026 at 0600 UTC (11:00 PM PDT on July 28), for Spokane, Washington.
The red temperature trace in the lowest part of the sounding increases with height through roughly the lowest 50–100 hPa (approximately the lowest 500–1000 m). This is a classic radiation inversion.