Current Weather At... (Option #1)
Just mouse-over the airport you are interested in.
You can select different regions via pull-down menus on
upper right (Available City ZOOMS) & upper left (Select Map)
Green dot is VFR, Red Dot is IFR; the full legend is at the bottom of the window.
Current Weather At... (Option #2)
Select STATION ID from the pull-down menu in upper left corner of the window
followed by the Airport Designator (e.g., KLVK)
and Enter or Return.
(Other options are Zip Code, City/State, and Lat/Long.)