Forest Fires in the United States: 28 March 2000

The Wildland Fire Assessment System (WFAS) is a contribution of "The Fire Behavior Research Work Unit", Missoula (Montana USA). The broad area component of the Wildland Fire Assessment System (WFAS) generates 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. 1. & 2. Fire Danger Forecast Maps of the United States for 27 March (observation time) and 28 March (forecast) 2000
(Source: Fire Behavior Research Work Unit, Missoula)

Wildland Fire Update (27 March 2000)
The National Interagency Fire Center (NIFC) provides new data of the current wildland fire season in the United States. These data were analysed after different geographic regions. Further, a five-year wildland fire comparison statistic shows the number and the area of wildland fires from 1996 to 2000.

Wildland fire activity decreased in the southern and eastern due to increased precipitation. Very high to extreme fire conditions remain, however, in Texas, New Mexico and Arizona.
While burning conditions in some states are severe, other states throughout the country are experiencing ideal conditions for prescribed fires. As of today, nearly 430,000 acres (174,014 ha) of wildlands have been treated by prescription fires. Prescribed fires are planned under specified conditions intended to improve the health of the natural landscape and/or reduce hazardous build-up of vegetation that lead to devastating wildland fires.
Long-range, 30-day weather forecasts are predicting above-normal temperatures and below-normal precipitation for the southern tier of states from southern California to Florida and throughout the Midwest (see Fig.4. 30 and 90-day forecast maps).

Tab.1. Five-Year Wildland Fire Comparison Statistics Year-to-Date for the United States (27 March 2000)
(Source: National Interagency Fire Center (NIFC))

As of 03/27/00	Number of Wildland Fires	Area burnt
As of 03/27/00	Number of Wildland Fires	Acres	Hectars
2000	18,779	549,866	222,522
1999	14,811	179,735	72,736
1998	4,128	56,992	23,064
1997	11,465	240,723	97,417
1996	24,191	524,235	212,150

Keetch-Byram Drought Index (KBDI) by Florida's Division of Forestry / Forest Protection Bureau
John Keetch and George Byram developed the K/B index at the Southern Forest Fire Laboratory to evaluate the effects of long-term drying on litter and duff and subsequently, on fire activity (1968). The index is based on a measurement of 8 inches (20 cm) of available moisture in the upper soil layers that can be used by vegetation for evapotranspiration. The index measure is in hundredths (0.01) of an inch of water and has a range of 0 through 800, with 0 being saturated and 800 representing the worst drought condition. The index indicates deficit inches of available water in the soil. A K/B reading of 250 means there is a deficit of 2.5 inches (64 mm) of ground water available to the vegetation. As drought progresses, there is more available fuel that can contribute to fire intensity.
For further information on the KBDI please refer to Keetch-Byram Drought Index Revisited: Prescribed Fire Applications.

The Florida Forest Fire Weather Index (FWI) System is part of the "Florida Fire Management Information System (FFMIS)" and 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 27 March these parameters show various fire weather conditions for Florida.


Fine Fuel Moisture Code	Duff Moisture Code	Drought Code

Initial Spread Index	Buildup Index	Fire Weather Index

The Southern Area Coordination Center Morning Report (27 March 2000) is a narrative summary of fire activity within the Southern Area including number of fires, wildfires as well as prescribed burns, and area. (For detailed numbers of wildfires and prescribed burns, please refer to the original website of the report.)

SOUTHERN AREA:
Southern Area Coordination Center (GA-SAC): Due to WIMS being down yesterday, SACC was not able to pull a current SIT report.
A tornado watch is in effect for southern Louisiana. The Carolina’s and Virginia are to expect rain from ½” to 1” (13-25 mm). Alabama, northwest Texas and southern Florida are to expect rain today. The forecast for tomorrow is for dry conditions in all areas.
Southeastern and South Central Compact: No fire activity reported.
ARKANSAS/OKLAHOMA:
Arkansas/Oklahoma Interagency Coordination Center (AR-AOC): Tornado warnings are in effect.
FLORIDA:
Florida Division of Forestry (FL-FLS): The State completed initial attack on 2 fires from unknown causes, 5 lightning caused fires and 9 man-made fires.
KENTUCKY: .
Daniel Boone National Forest (KY-DBF): The Forest completed initial attack. The London Ranger District had a fire totaling 75 acres (30 ha). The Sterns Ranger District had a fire of 75 acres (30 ha). No resources are anticipated at this time. Six drops of retardant were completed on the Forest yesterday.
LOUISIANA:
Louisiana Interagency Coordination Center (LA-LIC): The State has modified their burning ban to allow some prescribed burning.
National Forests in North Carolina (NC-NCF): The 200 acre (80 ha) Dicks Creek Fire on the Wayah Ranger District is 80% contained. The fire is a joint effort between the Forest Service and State. Helicopter 206HE is dropping retardant on the fire. The Asheville hotshots are committed to the fire. The fire is in very steep terrain. The Douglas Creek Fire is controlled and a Type II crew has been released. The forecast predicts low humidity and high winds.
TENNESSEE:
Tennessee Interagency Coordination Center (TN-TNC): Tanker T9 dropped 6 loads of retardant yesterday. Tankers and helicopters are available
Cherokee National Forest (TN-CNF): The Forest reported no wildland fires or prescribed burning. The Forest is monitoring existing burns. Rain is expected this morning.

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)

Current Situation:
No new large fires were reported to the National Interagency Coordination Center this week. Initial attack activity has been light in the Southern, Eastern, Southwest, and Southern California Areas. Very high to extreme fire indices were reported in Texas, New Mexico, and Arizona.
Outlook:
Arizona will be partly cloudy this weekend with high temperatures in the 50's (10-15°C) in the north and 70's (21-26°C) in the south. The rest of the week will be windy and cooler with a chance of valley showers or mountain snow. Temperatures will be in the 30's (-1 to 4°C) in the mountains and 60's (16-20°C) elsewhere.
Texas will be partly cloudy with patchy morning drizzle in the southwest. Tuesday and Wednesday will be breezy and cloudy with a chance of showers in the south. The remainder of the week will see a return to more normal conditions.
Florida will be partly cloudy this weekend with high temperatures in the 70's (21-26°C) in the north and 80's (27-31°C) south. Monday and Tuesday the forecast is for a chance of thunderstorms in the north and a slight chance of showers in the south. Wednesday will see a return to normal daily temperatures with little or no precipitation anticipated for the area.

Geographic Area	Number of Fires	Area Burnt
Geographic Area	Number of Fires	acre	ha
Alaska	0	0	0
Northwest	1	0	0
California	257	1,131	458
Northern Rockies	0	0	0
Eastern Great Basin	3	54	22
Western Great Basin	1	1	0,4
Southwest	481	190,749	77,193
Rocky Mountain	54	2,720	1,101
Eastern	1,872	44,335	17,942
Southern	16,110	311,876	126,212
Total United States	18,779	549,866	222,522

Geographic Area	Number of Prescribed Fires	Area Burnt
Geographic Area	Number of Prescribed Fires	acre	ha
Alaska	0	0	0
Northwest	22	2,900	1,174
California	86	2,557	1,035
Northern	0	0	0
Eastern Great Basin	5	124	20
Western Great Basin	0	0	0
Southwest	386	32,187	13,026
Rocky Mountain	14	1,126	0
Eastern	67	13,598	5,503
Southern	680	377,402	152,729
Total United States	1,260	429,894	173,971

Geographic Area	Number of WFU Fires	Area Burnt
Geographic Area	Number of WFU Fires	acre	ha
Alaska	0	0	0
Northwest	0	0	0
California	1	0	0
Northern Rockies	0	0	0
Eastern Great Basin	0	0	0
Western Great Basin	0	0	0
Southwest	1	300	121
Rocky Mountain	0	0	0
Eastern	0	0	0
Southern	0	0	0
Total United States	2	300	121

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.

A set of photographic documents on prescribed burning techniques and objectives in the Southeast can be visited in our photo archive.