Significantly expanded evacuation orders were just announced within the hour via this alert. Below I’ve annotated this onto the official Zone map for Healdsburg and surrounding areas (note I do not include zones 4A1 & 4C1 as they are not on this map proper, but are too under mandatory evacuation).
Those zones highlighted in redish-pink are now under evacuation orders; those in yellow are new evacuation warnings:
Update 12:28PM 08/22/2020: at nearly the same time the above new orders were issued a clear wind change was picked up on my air quality monitor (deployed at our home in north-central Healdsburg), as shown by the significant uptick in particulate matter readings at around ~11AM (the outlier spikes are from smoking cigarettes near the monitor and can be ignored):
Update 1:10PM 08/22/2020: I clearly spoke too soon, as the readings have shot through the roof in the last half-hour (note the significant difference in y-axis range from the previous plot):