High Probability of Delays Expected at Washington Dulles International (IAD) on February 18, 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
Medium 4:00 AM on 2/18 6:00 AM on 2/18 More information
High 6:00 AM on 2/18 10:00 AM on 2/18 More information
Medium 10:00 AM on 2/18 1:00 PM on 2/18 More information
Medium 1:00 PM on 2/18 4:00 PM on 2/18 More information
Low 4:00 PM on 2/18 11:00 PM on 2/18 More information
Medium 11:00 PM on 2/18 7:00 PM on 12/31 More information

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Medium Probability of Delays Between 4:00 AM on 2/18 AND 6:00 AM on 2/18

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

Snow causes many issues at airports, reducing the visibility for landing aircraft and making the runway slippery. Airports that typically see a lot of snow will have the resources to clean up, but heavy snowstorms may cause extended delays.

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

Normal Forecast
Conditions None Snow

Visibility Greater than 2 10
Wind Less than 11.8 MPH 7.1 MPH
Clouds Higher than 1,000 Overcast at 5,000

High Probability of Delays Between 6:00 AM on 2/18 and 10:00 AM on 2/18

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 Snow

Visibility Greater than 2 0.5
Wind Less than 11.8 MPH 5.9 MPH
Clouds Higher than 1,000 Overcast at 800

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.

Medium Probability of Delays Between 10:00 AM on 2/18 AND 1:00 PM on 2/18

During this time period the airport expects to experience low clouds and snow which will cause a medium likelihood that flights will experience delays.

Snow causes many issues at airports, reducing the visibility for landing aircraft and making the runway slippery. Airports that typically see a lot of snow will have the resources to clean up, but heavy snowstorms may cause extended delays.

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

Normal Forecast
Conditions None Snow

Visibility Greater than 2 1.0
Wind Less than 11.8 MPH 7.1 MPH
Clouds Higher than 1,000 Overcast at 800

Medium Probability of Delays Between 1:00 PM on 2/18 AND 4:00 PM on 2/18

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

Snow causes many issues at airports, reducing the visibility for landing aircraft and making the runway slippery. Airports that typically see a lot of snow will have the resources to clean up, but heavy snowstorms may cause extended delays.

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

Normal Forecast
Conditions None Snow

Visibility Greater than 2 10
Wind Less than 11.8 MPH 7.1 MPH
Clouds Higher than 1,000 Overcast at 1,500

Low Probability of Delays Between 4:00 PM on 2/18 and 11:00 PM on 2/18

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 5.9 MPH
Clouds Higher than 1,000 Overcast at 1,500

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 PM on 2/18 AND 7:00 PM on 12/31

During this time period the airport expects to experience mist which will cause a medium 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 10
Wind Less than 11.8 MPH 5.9 MPH
Clouds Higher than 1,000 Overcast at 1,000

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