Severe weather in Phoenix and the Northeast delayed hundreds of flights on Oct. 13.

The Federal Aviation Administration ordered a ground delay at Phoenix Sky Harbor International Airport because of cloudy conditions in metro Phoenix.

Tropical moisture from the remnants of Hurricane Priscilla brought wet and cloudy weather to the region through the weekend, continuing into Monday.

Weather in the Northeast is also disrupting travel. A Nor'easter brought strong winds, heavy rain and flooding across the Mid-Atlantic coast, delaying more than 1,000 flights nationwide.

Here's what travelers should know if they're traveling on Oct. 13.

Cloudy weather in metro Phoenix is delaying flights. The FAA ordered a ground delay at Sky Harbor on the morning of Oct. 13, in effect through 5:59 p.m. Monday.

Flights are delayed about 50 minutes on average, according to the FAA.

As of 9:30 a.m. on Oct. 13, 322 flights were delayed at Sky Harbor, but none were canceled, according to flight tracking website FlightAware.

The FAA can order a ground delay when flights destined for an airport experiencing adverse conditions must delay their takeoffs, according to the FAA.

It can also order a ground stop when it's not safe for flights to take off or land at an airport.

The FAA does not cancel flights.

It's not just wild weather in Phoenix disrupting flights on Oct. 13. Weather on the other side of the country is affecting travelers' itineraries.

A Nor'easter storm that slammed the East Coast disrupted at least 1,000 flights nationwide. Flights to and from New York City, Boston, Philadelphia, Baltimore and Washington, D.C., were among those affected.

Most major airlines are offering passengers the chance to rebook their travels without paying fare differences or change fees, or receive refunds if they choose not to travel.

American Airlines will rebook passengers at 17 affected airports for travel by Oct. 15 if they rebook their travel by Oct. 13.

Southwest Airlines will rebook passengers at 13 affected airports for travel within the next 14 days. Flights rebooked for travel outside that window would be subject to fare differences.

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Michael Salerno is an award-winning journalist who's covered travel and tourism since 2014. His work as The Arizona Republic's consumer travel reporter aims to help readers navigate the stresses of traveling and get the best value for their money on their vacations. He can be reached at Michael.Salerno@gannett.com.

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Hundreds of flights delayed at Phoenix Sky Harbor. What travelers should know