rapid yellowing?

As you can see in the pictures below, an otherwise healthy plant that I have is starting to yellow out and just look sickly. This has happened before with a couple other plants, and the thing is the change is extremely fast, and these other plants went from green and thriving to completely yellowed out, crunchy, and basically too far gone to finish flowering within 3-4 days! I'm gonna flush out this plant and hopefully (fingers crossed) even out whatever problems it had, just wondering if anyone else would have any idea what could happen that would ruin a plant so quickly.

It's always about 3 weeks before the end of flowering, if that means anything?

Its normal... Its the plants way of saying the buds almost compleat so its ready to die... mission successfull...

Thats a good thing if its near the end.

Totally the way it should be (: Let the leaves get eaten away... when they go away the new little fan leaves it grew on your buds will grow... and so will your buds (: Just don't pull the leaves off until they've eaten all of the nutes from them.

I don't necessariy agree that all those burned leaf edges and tips are normal....I'd check for overfert and/or ph issues. The yellowing of the entire leaf doesn't frighten me since the plant will pull nitrogen from the larger fan leaves during flowering. The scorched edges are something else entirely imho.

my bad i was unaware that they were scortched... shoulda looked better

He also mentions that they changed from normal to "crunchy" in 3-4 days, which is not normal for the nitrogen deficiency in flowering.

I agree with weedhound on the pH and/or fert problems; fill out the troubleshooting questionnaire to give some more information on your setup.

That plant WILL finish, relax.
What is your pot size? Very sudden yellowing like that makes me think that you hit pot-bound just recently and your soil conditions are getting twitchy.
Flush well and check/adjust pH to eliminate salt tox and pH problems as a source.
Re=pot into a larger container.
Enjoy your harvest in a few short weeks!

Stinky makes everything sound like an adventure....no matter what....:)

Life IS an adventure. Growing plants simply adds to it.