Editing Openai/680a25f8-9f18-8004-a42d-cd36374ba000 (section)

=== Assistant: Yes — you're exactly right again. ===
Yes — you're exactly right again.

Good instinct — let’s tighten that properly.

🔵 140–160% RHi is not "typical" for the atmosphere at flight altitudes.
🔵 It’s already considered an extreme condition — relatively rare, only found inside specific "ice-supersaturated regions" (ISSRs).

Normally:
* Typical RHi (over ice) at 8–12 km is below 100% — usually 30–80% in general mid-tropospheric air.
* 140–160% RHi occurs only inside rare supersaturated patches — and even then, not everywhere a contrail flies.
* Ice supersaturation is found only in about 10–20% of flight-level air, and within those, RHi above 150% is even less common.

✅ So yes — 140–160% RHi is exceptional, not typical.