As wildfires continue to ravage parts of the country, the National Weather Service (NWS) has issued a “PDS” warning, signaling a particularly dangerous situation for fire weather. But what exactly does PDS mean, and how does it differ from other weather warnings?

What is PDS?

PDS stands for “Particularly Dangerous Situation,” which is the most extreme fire weather warning issued by the NWS. It’s reserved for situations where conditions are exceptionally hazardous, with a high risk of extreme fire behavior, rapid spread, and potential for significant damage or loss of life.

The Rolls Royce of Fire Weather Warnings

Think of PDS as the NWS’s top-tier warning, akin to a Rolls Royce in terms of its severity and importance. It’s not a warning that’s issued lightly, and when it is, it’s essential to take immediate action to protect yourself and your loved ones.

What triggers a PDS warning?

A PDS warning is typically issued when a combination of factors come together to create an extremely hazardous fire environment. These factors may include:

  • Gusty winds: Sustained winds of 30-40 mph or higher, which can spread embers and sparks, causing fires to spread rapidly.
  • Low humidity: Humidity levels below 10%, which can dry out vegetation and create an environment ripe for ignition.
  • Dry fuels: Dry, brittle vegetation that can ignite easily and burn rapidly.
  • Unstable atmosphere: Weather conditions that can lead to the formation of thunderstorms, which can bring strong winds and lightning.

What should you do if a PDS warning is issued?

If a PDS warning is issued for your area, it’s crucial to take immediate action to protect yourself and your loved ones. Here are some steps you can take:

  • Stay informed: Monitor local news and weather reports for updates on the fire situation.
  • Evacuate: If ordered to evacuate, do so promptly. Don’t wait until the last minute, as roads may become congested, and escape routes may be limited.
  • Prepare your home: If you’re not evacuating, prepare your home by closing windows, doors, and vents, and removing any combustible materials from around your home.
  • Stay safe: Avoid traveling to areas where fires are burning, and stay away from any areas that have been evacuated.

By understanding what a PDS warning means and taking prompt action, you can help keep yourself and your loved ones safe during extreme fire weather events.