Skip to Main Content
Modeling topographic influences on fuel moisture and fire danger in complex terrain to improve wildland fire management decision supportAuthor(s): Zachary A. Holden; W. Matt Jolly
Source: Forest Ecology and Management. 262: 2133-2141.
Publication Series: Scientific Journal (JRNL)
Station: Rocky Mountain Research Station
View PDF (977.74 KB)
DescriptionFire danger rating systems commonly ignore fine scale, topographically-induced weather variations. These variations will likely create heterogeneous, landscape-scale fire danger conditions that have never been examined in detail. We modeled the evolution of fuel moistures and the Energy Release Component (ERC) from the US National Fire Danger Rating System across the 2009 fire season using very high resolution (30 m) surface air temperature, humidity and snow ablation date models developed from a network of inexpensive weather sensors. Snow ablation date occurred as much as 28 days later on Northfacing slopes than on South-facing slopes at upper elevations. South-facing slopes were hotter and drier than North-facing slopes but slope position, in addition to aspect, was also important because nocturnal air temperatures were coolest and humidity was highest in valley bottoms. These factors created heterogeneous fuel moistures and fire danger across the study area. In the late season (August and September), nocturnal cold air drainage and high relative humidity fostered fuel moisture recovery in valley bottoms, where fuel moistures and ERC values were 30% and 45% higher and lower, respectively at peak fire danger (September 29th). Dry fuel moistures and relatively high ERC values persisted on low elevation, Southfacing slopes. The driest conditions were observed 100-200 m above the valley floor where mid-slope thermal belts frequently developed above areas of cold air pooling. We suggest that a complete understanding of these variations may help improve fire management decision making.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationHolden, Zachary A.; Jolly, W. Matt. 2011. Modeling topographic influences on fuel moisture and fire danger in complex terrain to improve wildland fire management decision support. Forest Ecology and Management. 262: 2133-2141.
Keywordswildfire danger, climate, weather, topoclimate, snowmelt, microclimate
- Differences in fire danger with altitude, aspect, and time of day
- Fire and climate variation in western North America from fire-scar and tree-ring networks
- A method for ensemble wildland fire simulation
XML: View XML