Annotated Bobcat Fire Update (City of Arcadia)
***Update as of 9/9/2020 @ 4:51 PM***Voluntary evacuations lifted for residents north of Foothill Blvd. and east of Santa Anita Ave. The Bobcat Fire has generally progressed away from the City of Arcadia.  The current weather forecast suggests that Santa Ana winds will dissipate this evening and the Red Flag Warning will be removed after 8:00 p.m.Based on these factors, the City of Arcadia is removing the recommendation for residents to evacuate.  However, residents are advised to remain on alert for any changes to weather conditions that may affect the fire.  Evacuations may be necessary for your safety if conditions change. 
This is a particularly good sign!

Liked a tweet (Twitter)
This seems to be the first official resource with details about the evacuation warning. Sad that none of the local news, fire, or government sources on Twitter have got this sooner.

Event the local Altadena Sheriff’s station had little detail on a phone call. (I’m sure they got swamped.)

Read Bobcat Fire: Arcadia Warns Of Possible Evacuations As Blaze Surpasses 10,000 Acres (LAist)
The Bobcat fire ignited on Sunday and quickly grew to threaten Mount Wilson.
We’ve just gotten an evacuation warning, so I’m searching around a bit to find sources to back up the text that disappeared. So far there’s nothing in the media, and it may take a half an hour or more to find more details.  This is the only recent story online at the moment and there are a few spurious tweets that cover Altadena in the warning, but those are entirely unsourced.

Phone notifications that disappear too quickly in emergencies can be really bad UI.