Quick Admissions question? Please help! Thanks

Does University of Washington Seattle look at first semester grades for senior applicants while determining applicants? And will one C hurt my chances at all?? Thanks

For freshman applicants, usually they are just looking at the full freshman-junior year courses and grades. They do sometimes request grades for first semester of senior year, but only very rarely. And a C is fine - really the focus will be on the strength of your senior year schedule.

one C will NOT hurt your chances, they dont even require midyear reports for freshmen. if the rest of your app is good then you should be fine dude!

I sent online application ( transfer application) 1 month ago. Couple days ago, I visited myuw site to check my application status and I got this one mgs:
After giving your application to the UW Tacoma an initial review, we have determined that one or more documents, supporting materials, or additional information are required before further reviewing your application. All required materials must be postmarked by the application closing date for autumn quarter 2015.
I already sent to uw my current college transcript and shoud I send to uw my official high school transcript? And what happen next?
IF I have to send my high school transcript, can I send it after Mar 15,2015?
This is my first time make transfer to uw. Really need help.
Thanks all.