By the way, first time since Mercury that humans launch atop an Atlas LV
Ascent Abort Landing Zone Considerations:
• Wave height below 4 meters (13.1 ft)
• Surface wind below 27 knots (13.9 m/s)
• No thunderstorms within abort landing area
• No lightning within abort landing area
Launch Weather Constraints:
• Wind at the launchpad exceeds 61 kilometers per hour; 38 miles per hour (33 kn)
• Upper-level conditions containing wind shear that could lead to control problems for the launch vehicle
• Cloud layer greater than 1,400 meters (4,500 ft) thick that extends into freezing temperatures
• Cumulus clouds with tops that extend into freezing temperatures within 5 to 10 miles (8.0 to 16.1 km)
• 19 kilometers (10 nmi) of the edge of a thunderstorm that is producing lightning, for 30 minutes after the last lightning is observed
• Field mill instrument readings within 9.3 kilometers (5 nmi) of the launch pad or the flight path exceeds plus or minus 1,500 volts per meter, for 15 minutes after they occur
• Thunderstorm anvil is within 19 kilometers (10 nmi) of the flight path
• Thunderstorm debris cloud is within 5.6 kilometers (3 nmi) or fly through a debris cloud for three hours
• Launch prohibition through disturbed weather that has clouds that extend into freezing temperatures and contain moderate or greater precipitation, or launch within 9.3 kilometers (5 nmi) of disturbed weather adjacent to the flight path
• Launch prohibition through cumulus clouds formed as the result of or directly attached to a smoke plume
• Starliner unique precipitation restriction, No-Go if precipitation is within plus or minus 2 nautical miles (3.7 km) of the flight path
Source:
https://www.boeing.com/space/starliner/launch/documents/Starliner_Notebook.pdf
Last prediction I've heard was 92% chance for a go, as far as the weather is concerned.