coraa | Words the English language needs

I don't know about the rest of you, but I could really use these words:

something done futilely, when you know that it's futile, but you do it nevertheless -- like running after a bus pulling away from the stop when you know you'll never catch it.
the same situation, but when, in total contradiction to Murphy's law, you actually accomplish the futile task -- like when the bus driver sees you sprinting and, in a fit of unusual mercy, stops
the feeling when you realize you've done something stupid or dreadful the exact second that it's too late to correct it -- like when you realize you've locked your keys inside exactly when the door clicks to, or when you hit 'send' on an email and realize a split second after that the email contains something mocking or scathing about someone you've inadvertently left on the cc list. (I've heard 'ohnosecond' proposed as the word for this moment.)
the same feeling of having done something incorrectably dreadful, but when, instead of smacking you in the face immediately, it grows slowly into a miasma of dread and worry; especially when you can't check to see if you've actually done it or not -- like when you spend the whole day fretting about whether or not you cc'ed the person you were speaking scathingly about, but have no access to your email to check
the particular smell and feel of the air in the morning in Southern California (and, I presume, other hot sunny regions) when you can tell the day will be hot but it isn't yet, when the air is warm but also intangibly soft and is full of the smell of plants slowly heating in the sun. (People in cold and wet regions get lots of words for their conditions; I petition that we deserve some, too. And yes, this is what it's like out on my balcony right this very minute.)
in the same vein, the feel of the air at midday in summer on certain Los Angeles days, hot and dry as an oven, almost tangible, when feeling the sun on the back of your neck is as real and solid a presence as if someone had put their hand there

There may already be words -- English has plenty I don't know -- but these I'd especially like.