winds. The PDS red flag warning below was issued by the National Weather Service in Reno, Nevada, on December 19, 2017. On August 3, 2018, the National Weather Service in Reno, Nevada, issued another PDS red flag warning to communicate the threat of life-threatening fire danger due to strong gusty winds and low humidity. On April 12, 2022, the National Weather Service in Norman, Oklahoma, issued a PDS red flag warning because of an extreme fire weather behavior (overlap of extremely dry fuels, humidity as low as 8 percent and wind gusting to 60 mph). PDS severe thunderstorm watch PDS severe thunderstorm watches are issued when there is a higher than normal risk of severe thunderstorm winds capable of major structural damage (in addition to large hail and perhaps a few isolated tornadoes), usually due to a strong and persistent derecho. These watches are very rare (accounting an average of only two each year), as the risk for tornadoes must remain low enough to not warrant a tornado watch (a normal tornado watch would be issued if the tornado risk is significant alongside the extreme wind threat). This PDS severe thunderstorm watch shown below was issued by the Storm Prediction Center in Norman, Oklahoma, on May 12, 2022, for an derecho in portions of Iowa, Minnesota, Nebraska, and South Dakota. PDS special marine warning PDS Special marine warnings are issued by the National Weather Service to inform mariners of weather conditions that present a considerable threat to life and property. On April 19, 2018, the Baltimore/Washington, D.C. forecast office upgraded a special marine warning to PDS status as a gust front approached Chesapeake Bay. PDS special weather statement PDS special weather statements are usually issued by the NWS for hazards that do not have a specific code of their own, and pose an exceptionally high risk of damage and loss of life. The PDS special weather statement below was issued by the National Weather Service in Buffalo, New York, on December 11, 2013, regarding extreme amounts of lake effect snow to impact the defined area. The same office issued multiple PDS Special Weather Statements for hurricane-force winds forecast to hit the Buffalo area on February 24, 2019. PDS tornado watch PDS tornado watches are issued when there is a higher than normal risk of multiple strong to violent tornadoes – especially those that are predicted to be long-track in nature,