Note pun. "weather" from Okrand's Notes, HolQeD Vol 2. No. 4, and in KGT. Refers to weather in general.

yoq yIn yuQ 'oH Qo'noS'e'. yInSIp voQSIp je ngaS muDDaj. Qo'noS is a class-M planet with an oxygen/nitrogen atmosphere. S27 muDDaq 'eDSeHcha lulaQlu'bogh: jav Atmospheric Take-Off/Landing Thrusters - 6 (KBoP) muD ngeb SeHwI' pat atmospheric control system (KBoP) jevqu'taHvIS muD ral, bejlI' parmaq. That looks on tempests and is never shaken. (Sonnet 116) ["While the violent atmosphere storms, love still watches."] HQ 2.4: The Klingon word for weather, meaning the state of the atmosphere, is the same as the word for atmosphere itself, muD. When inquiring about specific weather conditions at a specific time and/or place, the expression muD Dotlh (literally, "atmosphere status") is used. st.k (11/1997): Speakers who do this seem to be aware that they are breaking the rules, so they are doing it for rhetorical effect. (It has the same sort of feeling, perhaps, as if someone were to say in English... "It's lightninging and thundering outside"...) TKD 10: Unlike most speakers of English, who begin conversations with greetings, inquiries about the state of health of the conversants, and remarks about the weather, Klingons tend to begin conversations by simply stating the main points. PUNS: 1) "mud"; 2) "mood" (mood lighting adds atmosphere)? Related words: muD Dotlh weather (at any given moment) muD Duj airplane (n) (TNK muD ngeb [artificial atmosphere] KBoP chal sky (n) SuS wind (n) SIp gas (n) SeS steam (n) 'eng cloud (n) Cf. also the weather verbs jev storm, SIS rain, peD snow.