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Keyword: weather

The significance of the effect of stand density upon the weather beneath the canopy

Publications Posted on: August 12, 2015
During the middle of the nineteenth century forests were believed to have important influences on climate. As climate was more thoroughly understood it became evident that the major climatic controls were beyond the influence of forest cover, a finding which wholly discredited the earlier conclusions.

Using weather forecasts for predicting forest-fire danger

Publications Posted on: August 06, 2015
Three kinds of weather control the fluctuations of forest-fire danger-wet weather, dry weather, and windy weather. Two other conditions also contribute to the fluctuation of fire danger. These are the occurrence of lightning and the activities of man. But neither of these fire-starting agencies is fully effective unless the weather has dried out the forest materials so they are dry enough to burn.

Relation of weather forecasts to the prediction of dangerous forest fire conditions

Publications Posted on: August 06, 2015
The purpose of predicting dangerous forest-fire conditions, of course, is to reduce the great cost and damage caused by forest fires. In the region of Montana and northern Idaho alone the average cost to the United States Forest Service of fire protection and suppression is over $1,000,000 a year.

Relation between height growth of larch seedlings and weather conditions

Publications Posted on: August 06, 2015
It is a common experience in passing through stands of coniferous seedlings ten to thirty feet tall to notice the rapidly growing leaders of the dominant trees. A casual glance will show a surprising variation in the rate of height growth of the same tree in different years. The obvious explanation that occurs to one is that this variation is clue to a corresponding variation in the weather in the different years.

Assessing the impacts of recent climate change on global fire danger

Projects Posted on: March 31, 2015
Wildfires occur at the intersection of dry weather, available fuel, and ignition sources. Weather is the most variable and largest driver of regional burned area. Temperature, relative humidity, precipitation, and wind speed independently influence wildland fire spread rates and intensities.

Hydrothermal assessment of temporal variability in seedbed microclimate

Publications Posted on: October 03, 2014
The microclimatic requirements for successful seedling establishment are much more restrictive than those required for adult plant survival. The purpose of the current study was to use hydrothermal germination models and a soil energy and water flux model to evaluate intra- and interannual variability in seedbed microclimate relative to potential germination response of six perennial grasses and cheatgrass.

The potential and realized spread of wildfires across Canada

Publications Posted on: September 19, 2014
Given that they can burn for weeks or months, wildfires in temperate and boreal forests may become immense (eg., 100 - 04 km2). However, during the period within which a large fire is 'active', not all days experience weather that is conducive to fire spread; indeed most of the spread occurs on a small proportion (e.g., 1 - 15 days) of not necessarily consecutive days during the active period.

Mapping day-of-burning with coarse-resolution satellite fire-detection data

Publications Posted on: September 19, 2014
Evaluating the influence of observed daily weather on observed fire-related effects (e.g. smoke production, carbon emissions and burn severity) often involves knowing exactly what day any given area has burned.

Contributions of ignitions, fuels, and weather to the spatial patterns of burn probability of a boreal landscape

Publications Posted on: March 22, 2012
The spatial pattern of fire observed across boreal landscapes is the outcome of complex interactions among components of the fire environment. We investigated how the naturally occurring patterns of ignitions, fuels, and weather generate spatial pattern of burn probability (BP) in a large and highly fireprone boreal landscape of western Canada, Wood Buffalo National Park.

Modeling topographic influences on fuel moisture and fire danger in complex terrain to improve wildland fire management decision support

Publications Posted on: February 24, 2012
Fire 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.