Southern California wildfires: the first six hours

Wildfire Black Box · Comparative evidence study · 6 November 2026

Palisades and Eaton began during the same January 2025 wind episode. Their documented early operations differed. Woolsey adds a regional precedent for comparing how a rapidly evolving incident was observed and how evacuation actions were recorded.

Three incidents on a common clock

Each window starts at the incident register’s recorded start and ends six hours later. All dates below use Pacific Standard Time (UTC−08:00). The clock reference is a published incident time. Physical ignition and first observation can have their own timestamps.

Incident	Window	Clock source
Palisades	07 Jan 10:30–07 Jan 16:30 PST	Recorded start
Eaton	07 Jan 18:18–08 Jan 00:18 PST	Recorded start
Woolsey	08 Nov 14:24–08 Nov 20:24 PST	Recorded start

Documented actions and observations

Palisades

Local time	Elapsed	Documented event	Evidence
07 Jan 11:30	+01:00	County OEM sent an evacuation warning for Sunset Mesa.	A · pp. 23–24, narrative
07 Jan 11:36	+01:06	County fire and sheriff agencies joined in Unified Command.	A · p. 23
07 Jan 11:52	+01:22	County OEM sent an evacuation order for East Sunset Mesa.	A · pp. 23–24
07 Jan 12:07	+01:37	The county review lists a City LAFD evacuation order for Topanga State Park.	A · appendix timeline, p. 98
07 Jan 13:39	+03:09	The county review lists a City LAFD evacuation order for Pacific Palisades.	A · appendix timeline, p. 98

Eaton

Local time	Elapsed	Documented event	Evidence
07 Jan 18:45	+00:27	Aircraft were grounded in hazardous winds, limiting aerial observation.	A · weather and aerial response discussion
07 Jan 18:48	+00:30	County OEM sent a monitoring advisory for 12 zones at the direction of Incident Command.	A · p. 24, approximate time
07 Jan 19:26	+01:08	The county narrative records Incident Command directing the first evacuation orders for seven zones. The appendix labels this as issuance.	A · p. 24 and appendix timeline, p. 98

After the six-hour window

Local time	Elapsed	Documented event	Evidence
08 Jan 03:25	+09:07	County OEM sent evacuation messages covering areas west of Lake Avenue.	A · evacuation narrative and appendix timeline, p. 100
08 Jan 05:13	+10:55	The 2026 county summary places the main front crossing west of Lake Avenue at about this time in a specified segment.	C · key findings, crossing between Concha Street and East Las Flores Drive

Woolsey

Local time	Elapsed	Documented event	Evidence
08 Nov 14:34	+00:10	The city review records the first LAFD units dispatched to assist county agencies.	L · Woolsey incident timeline, p. 7
08 Nov 16:30	+02:06	The city review lists evacuations for Calabasas. The row does not specify channel, message delivery or warning versus order.	L · Woolsey incident timeline, p. 7
08 Nov 17:30	+03:06	The city review lists evacuations for Bell Canyon.	L · Woolsey incident timeline, p. 7
08 Nov 20:00	+05:36	The county review describes a helicopter reconnaissance flight at approximately 20:00.	B · section 3.2, event 34

What the comparison establishes

Two clocks for alerting. The Palisades county order at +01:22 is a documented transmission for East Sunset Mesa. The Eaton +01:08 entry is documented in the narrative as a direction to send and in the appendix as issuance. A 14-minute difference in those entries describes source timestamps with different semantics and geographic scopes. To compare warning performance, the next evidence needed is a matched zone-by-zone log of decision, transmission, receipt and action.

Weather context and observation capacity. The NWS regional history identifies a strong offshore wind episode for January 2025. The county review records aircraft grounded early at Eaton. The Woolsey county review records a reconnaissance flight at roughly +05:36 and lists Cheseboro observations at 21:00, or +06:36, outside its window. These records establish a regional analogue and an operational contrast. A quantitative match would require matched station exposure, sustained winds, gust averaging, relative humidity, fuel conditions and matched observation windows. NWS regional weather history · Woolsey county review, events 34 and 36.

West Altadena shows why event types matter. The 2025 review records a 22:50 call suggesting fire west of Lake Avenue and discusses the uncertainty of that observation. The 2026 county summary separately gives an approximate main-front crossing time for a defined segment. The 03:25 messages and the 05:13 crossing are both after the six-hour cutoff at 00:18. A reported observation, spot fire and mapped main-front crossing describe different events. They cannot establish what every household received or when each address came under threat. County 2025 review · County 2026 summary.

Evidence limits and version notes

The Eaton appendix graphic shows 18:17. The incident register and county overview give 18:18, the clock reference used here. Adopting 18:17 would add a minute to each Eaton elapsed time.
The rows are selected documented events. Their coverage varies by agency, channel and geographic footprint.
This comparison makes no incident-wide claim about warning receipt, decision quality or evacuation effectiveness.