Forecast for station KIAD, forecast created on 312058Z, covering the period from 05/31 21:00Z to 05/02 00:00Z... Forecast calls for wind from heading 330° at 8 knots. Visibility unlimited. Few clouds at 20000 feet... From 05/31 23:00Z expect wind from heading 30° at 5 knots. Visibility unlimited. Few clouds at 5000 feet. Scattered clouds at 8000 feet... From 05/01 04:00Z expect variable winds at 4 knots. Visibility unlimited. Scattered clouds at 6000 feet. Scattered clouds at 10000 feet... From 05/01 10:00Z expect wind from heading 120° at 5 knots. Visibility unlimited. Few clouds at 500 feet. Broken clouds at 6000 feet... From 05/01 12:00Z expect wind from heading 120° at 6 knots. Visibility unlimited. Scattered clouds at 6000 feet. Broken clouds at 12000 feet... From 05/01 15:00Z expect vicinity showers. Wind from heading 160° at 12 knots gusting to 20 knots. Visibility unlimited. Broken clouds at 7000 feet... From 05/01 20:00Z expect vicinity thunderstorms. Wind from heading 150° at 12 knots gusting to 20 knots. Visibility unlimited. Overcast cumulonimbus clouds at 6000 feet...