Forecast for station KIAD, forecast created on 192159Z, covering the period from 05/19 22:00Z to 05/21 00:00Z... Forecast calls for wind from 180° at 6 knots. Visibility unlimited. Scattered clouds at 3500 feet. Broken clouds at 6000 feet... From 05/20 01:00Z expect wind from 170° at 5 knots. Visibility unlimited. Broken clouds at 2000 feet... From 05/20 05:00Z expect mist. Wind from 170° at 6 knots. Visibility 5 miles. Overcast clouds at 900 feet... From 05/20 12:00Z expect mist. Wind from 190° at 8 knots. Visibility 2 miles. Overcast clouds at 800 feet... From 05/20 18:00Z expect wind from 200° at 7 knots. Visibility unlimited. Broken clouds at 5000 feet...