High Probability of Delays Expected at Washington Dulles International (IAD) on May 5, 2021

Delays are expected at Washington Dulles International (IAD) today. All times on this page are displayed in local time for Washington Dulles International .

Risk Beginning Ending Details
High 2:00 AM on 5/5 7:00 AM on 5/5 More information
Low 7:00 AM on 5/5 11:00 AM on 5/5 More information
Medium 11:00 AM on 5/5 2:00 PM on 5/5 More information

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High Probability of Delays Between 2:00 AM on 5/5 and 7:00 AM on 5/5

During this time period the airport expects to experience low visibility which will cause a high likelihood that flights will experience delays.

Here is a look at what the forecast conditions are and what is required for normal operation:

Normal Forecast
Conditions None Mist

Visibility Greater than 2 0.75
Wind Less than 11.8 MPH 4.7 MPH gusting to 29.4 MPH
Clouds Higher than 1,000 Clear

While the weather conditions should be good enough to land aircraft the low visibility caused by these weather conditions will probably require ATC to slow down the flow of traffic to ensure that aircraft arrive safely.

Low Probability of Delays Between 7:00 AM on 5/5 and 11:00 AM on 5/5

During this time period the airport expects to experience rain in the forecast which will cause a low likelihood that flights will experience delays.

Here is a look at what the forecast conditions are and what is required for normal operation:

Normal Forecast
Conditions None Rain

Visibility Greater than 2 10
Wind Less than 11.8 MPH 4.7 MPH gusting to 29.4 MPH
Clouds Higher than 1,000 Overcast at 5,000

Depending on the severity of the rain this may have no impact on your flight. Light rain is typically OK to take off and land through, but heavier rain may be something that your pilot decides to wait out on the ground.

Medium Probability of Delays Between 11:00 AM on 5/5 AND 2:00 PM on 5/5

During this time period the airport expects to experience thunderstorms which will cause a medium likelihood that flights will experience delays.

Thunderstorms are potentially deadly for aircraft, mainly because of the unpredictable and severe winds that are associated with these storms. That wind causes a significant risk to landing aircraft and so airports will typically close during thunderstorms.

Lightning can also cause a hazard to ground staff, so airports may decide to stop servicing aircraft on the ground during these storms and for a period of time after they have passed.

Here is a look at what the forecast conditions are and what is required for normal operation:

Normal Forecast
Conditions None Thunderstorms

Visibility Greater than 2 10
Wind Less than 11.8 MPH 9.4 MPH gusting to 29.4 MPH
Clouds Higher than 1,000 Clear

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