Forest Fires in the United States: 23 February 2000
Forest Fires in the United States
23 February 2000
Several active fire signals were recorded by OSEI with the NOAA-14 POES AVHRR HRPT satellite on 22 February 2000 in Arkansas, Louisiana, Mississippi and Alabama.
Fig. 1. Scattered heat signatures and smoke plumes from areas of fire burning in the southeastern United States.
(Source: NOAA/OSEI)
The Wildland Fire Assessment System is a contribution of “The Fire Behavior Research Work Unit”, Missoula (Montana USA). The broad area component of the Wildland Fire Assessment System (WFAS) generated national maps of selected fire weather and fire danger components. Fire Danger (Potential) is a normalized adjective rating class across different fuel models and station locations. It is based on information provided by local station managers about the primary fuel model, fire danger index selected to reflect staffing level, and climatological class breakpoints. Low danger (class 1) is green and extreme potential (class 5) is red.
Fig. 2. and 3. Fire Danger Forecast Maps of the United States for 22 February (observation time) and 23 February (next day forecast; right map) 2000
(Source: Fire Behavior Research Work Unit, Missoula)
The Forest Fire Weather Index (FWI) System consists of six components that account for the effects of fuel moisture and wind on fire behavior. The first three components are fuel moisture codes that follow daily changes in the moisture contents of three classes of forest fuel with different drying rates. The last three components are fire behavior indexes, representing rate of spread, amount of available fuel, and fire intensity; their values increase as fire weather severity increases. For detailed information on the Florida Fire Management Information System (FFMIS) the GFMC would like to refer to the original website.
According to the FFMIS for 21 February 2000 these parameters show various fire weather conditions over Florida.
Fine Fuel Moisture Code
Duff Moisture Code
Drought Code
Initial Spread Index
Buildup Index
Fire Weather Index
Fig.4.-9. Output maps of the FFMIS, 21 February 2000
The wildfire page by the BLM Arizona State Office is providing information on the current wildland fire statistic in the Southwest Area (2000 year-to-date statistic as of 22 February 2000).
Tab.1. Number and area of fires by states in the Southwest Area
(Source: BLM Arizona State Office, 22 February 2000)
Human-caused fires Lightning-caused fires Total number acres hectares number acres hectares number acres hectares Arizona 112 989 396 0 0 0 112 989 396 New Mexico 114 95,430 38,172 0 0 0 114 95,430 38,172 W. Texas 0 0 0 0 0 0 0 0 0 Southwest Area 226 96,419 38,568 0 0 0 226 96,419 38,568
In addition, the page also provides background information and data on fires by unit and fire history.
According to the INCIDENT MANAGEMENT SITUATION REPORT three categories of fires are distinguished, such as:
1. Fires*
2. Prescribed Fires
3. Wildland Fire Use Fires**
* This classification corresponds to the category “wildland fires” as defined by the National Interagency Fire Center (NIFC)
** A brief excursion to wildland fire terminology:
Wildland Fires: Fires occurring on any tpye of vegetation, regardless of ignition sources, damages or benefits.
Wildfire: Any uncontrolled wildland fire which (1) may require suppression response, or (2) any uncontrolled wildland fire which meets management objectives and is declared as a Wildland Fire Use Fire (see below) or syn. Prescribed Natural Fire or Prescribed Fire.
Prescribed Fire: Occasionally also called management-ignited fire, or prescribed burning, is a controlled application of fire to vegetation in either their natural or modified state, under specified environmental conditions which allow the fire to be confined to a predetermined area and at the same time to produce the intensity of heat and rate of spread required to attain planned resource management objectives.
Wildland Fire Use Fire: Naturally ignited fire which is managed to achieve resource benefits under close supervision (syn. Prescribed Natural Fire)
Currently, Wildland Fire Use Fire data are not available. The differentiation of the above mentioned three fire classes do not point out clearly for the moment, whether the classified wildland fires included prescribed burned areas.
Tab.2. Fires and hectares year-to-date (18 February 2000)
(Source: Incident Management Situation Report)
Geographic Area Number of Wildland Fires Area Burned (ha) Alaska 0 0 Northwest 0 0 California 187 36 Northern Rockies 0 0 Eastern Great Basin 1 1.2 Western Great Basin 1 0.4 Southwest 206 38,456 Rocky Mountain 2 736 Eastern 25 162 Southern 5,065 31,903
Total United States
5,487 71,294
Tab.3. Prescribed fires and hectares year-to-date (18 February 2000)
(Source: Incident Management Situation Report)
Geographic Area Number of Prescribed Fires Area Burned (ha) Alaska 0 0 Northwest 18 795 California 43 938 Northern Rockies 0 0 Eastern Great Basin 3 11 Western Great Basin 0 0 Southwest 92 5,148 Rocky Mountain 0 0 Eastern 5 313 Southern 344 75,719
Total United States
505 82,924
Remarks on Prescribed Burning
At this time of the year prescribed burning operations are conducted routinely.
Fire is an important natural tool for ecosystem management. It can reduce dense vegetation improving wildlife habitat and lessening the potential for large, wildfire disasters. Land managers are directed to prepare a prescribed fire/burn plan for every area of public land that can burn. Some areas require total suppression while others will benefit from a wildland fire. Those areas that will benefit from a fire can be treated by a prescribed fire.
Especially, for the moment, in the southern and southeastern regions of the United States prescribed fire activities will be carried out in the following weeks and months. In this case, fire signals on satellite images can be traced back to this kind of land management activities.
In the Prescribed Fire Position Paper of the Forest Protection Bureau by the Division of Forestry in Florida, prescribed fire activity is described as a land management application that is essential to the practice of forestry, management of wildlife, preservation of endangered plant and animal species, improvement of range conditions and reduction of wildfire damage in the wildland/urban interface areas. While there is general public and landowner concern with increased smoke, reduced air quality, and liability; the general public and landowners benefit significantly from the reduction of devastating wildfire, improved wildlife habitat and forage, preservation of endangered and threatened plant and animal species, and improved management of forest resources. The prospect of severe reductions in the utilization of this management tool is of major concern to Florida’s natural resource managers and conservationists due to the subsequent loss of derived public and private benefits. They suggest the need for legislative attention.
Another report on nation-wide prescribed burning in the U.S.A. was published in International Forest Fire News No.19 (September 1998).
A set of photographic documents on prescribed burning techniques and objectives in the Southeast can be visited in our photo archive.
