Tracked live by the FAA, but its flight plan was first seen after takeoff, so we don't know the scheduled time and can't say whether it's late.

SOUTHWEST · FLIGHT WN 3844 LANDED 7:56 PM ET, ON TIME · SCHEDULED TIME UNKNOWN

WN 3844 · BNA → BWI

took off 5:34 PM CT · landed 7:56 PM ET (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 3h after departure

Odds over time

Arrive at BWI more than 15 minutes late?
30% chance · ±1 pts +6 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 10% 20% 30% 40% 1.1d 1d 12h 6h Departs Lands