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National Centers for Environmental Information of the National Oceanic and Atmospheric Administration – wind data
strongest evidence that winds were strong

Files

20260608 Santa Ana winds: strong, extremely dry katabatic winds that originate inland and affect coastal Southern California and northern Baja California. They drive most wildfires in Southern California MORE.rtf
20260609 59 mph winds detected right before the Altadena fire began, but winds exceeding 60 mph were detected earlier in the day, around 2:00 p.m.rtf
20260609 After the fires had started, the wind caused them to spread rapidly. The winds were so strong that they prevented the deployment of aerial firefighting aircraft.rtf
20260609 Helicopters were grounded by 7:00 p.m. on the first day of the wildfires and were not allowed to operate until the following afternoon. The winds were so strong that they prevented the deployment of aerial firefighting aircraft.rtf
20260609 katabatic: a downslope wind caused by the flow of an elevated, high-density air mass into a lower-density air mass below. The high-density air mass is usually cooler, and the katabatic winds are cool.rtf
20260609 the windstorm ultimately led to the ignition of fires that devastated Altadena, Malibu, and Pacific Palisades.rtf
20260609 “when the wind is blowing like this, there’s very little chance of stopping it until the wind subsides.”.rtf
20260611 Tropical storms wind speed (1), hurricane wind speed (2): (1) 39 mph, (2) 75 mph.rtf
20260611 firefighting aircraft cannot fly safely when gusts exceed 30–40 mph in steep canyon terrain -Gemini.rtf
20260921 Windbreaks to stop Santa Anas have been discussed and dismissed [wind breaks].rtf