Wildfire evidence study · California, United States · 2020
The LNU Lightning Complex offers a practical test of geographic bookkeeping. Its published acreage is a complex-wide total. Reusing that number for each affected county, or adding individual component fires to it, would overstate the amount of land represented by the event.
Documentary review · Sources checked 30 October 2026 · Historical case, not live incident information.
The published event record
| Field | Recorded value |
|---|---|
| Start | 17 August 2020 |
| Later milestone | 2 October 2020 |
| Reported acres | 363,220 |
CAL FIRE’s incident page records 363,220 acres, with a header listing Napa, Solano, Lake, Sonoma and Yolo counties. The corrected 2020 Board of Forestry annual report also reports 363,220 acres for LNU and lists 1,491 destroyed structures. This agreement supports using the acreage as a reported complex total; it does not provide a county-by-county allocation. See primary records below.
Three different questions require three different datasets
For total incident extent, the complex record is an appropriate starting point. For the share in a particular county, a perimeter needs to be intersected with an administrative boundary. For a household-loss question, the relevant evidence is building or dwelling records. One headline number cannot answer all three.
Complex boundaries also need a component crosswalk. If an analysis imports individual fire polygons as well as the parent complex, it must check for overlap before adding area. Counting database rows is not the same as counting independent incidents or unique burned land.
For a historical map, preserve the source version and observation date. The incident archive is a summary of an operational event, while a later research perimeter may have different geometry. A revised perimeter can improve the spatial estimate without changing the identity of the fire.
The comparison with the later Glass Fire should stay temporally explicit. Both affected the broader North Bay region in 2020, but they are separate case records. Claims about reburning require overlapping polygons and dates; regional proximity alone is not evidence that the same ground burned twice.
What this study does and does not establish
No component-level areas, county shares or reburn percentages are calculated. The damage figure is attributed to the corrected annual report and is not relabeled as homes or displaced residents.
This is a documentary evidence review, not fieldwork or an independent forensic investigation. Published numbers retain their source definitions. Differences are identified rather than silently reconciled. The analysis above is Tecnobosque’s interpretation of the cited record.
Primary records and source notes
- LNU Lightning Complex: official incident or annual record — chronology, scope and reported figures discussed above.
- Corrected 2020 Board of Forestry annual report — used only for the findings explicitly attributed in this study.
Continue the investigation
Glass Fire: structural loss and archive limitations · Read our evidence-review method · Browse United States cases · Browse the full fire archive
Cite this record
Tecnobosque. “LNU Lightning Complex 2020: Why a Complex Total Is Not a County Loss Estimate.” Documentary evidence review, 30 October 2026. https://tecnobosque.com/lnu-lightning-complex-2020/. Cite the underlying primary source when reusing its figures.