Objektive Analyse → objective analysis

OBS (beobachten, beobachted, Beobachtung) → OBS (Observe, observed, observation)

OBSC (verdeckt, verdeckend) → OBSC (Obscure or obscured or obscuring)

Observer → Observer

OCNL (gelegentlich, zeitweise) → OCNL (occassional or occasionally)

OCNL (häufige, aber noch deutlich getrennte CBs / TCUs, Bedeckungsgrad zwischen 50 und 75 %) → OCNL (area with coverage between 50 and 75% of Thunderstorms)

OCT (Oktober) → OCT (October)

offene See → offshore

Offene See → open ocean

okkludiertes Tiefdruckgebiet → occluded depression

Okklusionsfront → occluded front ökologische Nische → ecological niche

OPA (opakes milchiges Eis) → OPA (Opaque, white type of ice)

OPMET (operational meteorological control) → OPMET (operational meteorological control)

Orkan (Windstärke) → hurricane (wind force)

orkanartiger Sturm (Windstärke) → violent storm (wind force)

Orkantief → cyclonic depression

Orkantief → cyclonic low

orografische Hebung → orographic lift

orografische Hebung → orographic lifting

orografische Hebung → orographic uplift

orographisch → orographic

orographische Hebung → orographic lifting

orographische Hebung → orographic uplift

orographische Hebung → upslope flow

orographische Hebung → orographic ascent

orographische Wolke → cap cloud

örtlich → isolated

Ortszeit → local time

Ortszeit → local time L.T.

Ost-Wetterlage (Ostlage) →

Ostlage → easterly regime

Ostwind → easterly wind

Ostwinde → easterlies

OSV (ocean station vessel; Wetterschiff) → OSV (ocean station vessel)

OTLK (Outlook, Ausblick) → OTLK (Outlook)

OTP (on top; oberhalb der Wolkenobergrenze) → OTP (on top)

OVC (Overcast, 8/8) → OVC (Overcast, 8/8)

Overall → overall

Ozean → ocean

Ozon → ozone

Ozongehalt → ozone content

Ozonloch → ozone hole

Ozonschicht → ozone layer