Just going by yesterday, I'm assuming A&B do the first two hours (7 and 8am) while whoever is at TWC HD studios does the last hour at 9am (which in that case was Maria and Jen). So I guess essentially there's 4 hosts and they use the opener that doesn't include A&B for the other two hosts which doesn't make sense because they've made it clearly obvious that YWT is an A&B show now and have been for almost 3 years.
Today 7am-10am ET Jen did all the 7 Day Forecast segments and Maria did the Weather Headline segments.
So even though Mike and Stephanie are in NYC they are doing some segments from Atlanta.
9am was Jen and Maria only and the studio was very dark. From the desk, to the video wall to the green screen they were all under lit today.
So I assume now that:
6AM-7AM: WUWA - Al Roker & Stephanie Abrams (NYC)
7AM-9AM: YWT - Stephanie Abrams & Mike Bettes (NYC)
9AM-10AM: YWT - Maria LaRosa and Jen Carfagno (Mon-Wed)/Eric Fisher (Th-Fri) (Atlanta)
10AM-11AM: WUWA Repeat - Al Roker, Stephanie Abrams and Jen Carfagno/Eric Fisher with Live Weather Update. (NYC/Atlanta)