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Burnt Area:

26,591 km2 in 2004, 18,822 km2 in 2005

2,389 km2 in 2007, 11,715 km2 in 2009

0

20,000

40,000

60,000

80,000

100,000

120,000

140,00019

86

1987

1988

1989

1990

1991

1992

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1994

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2001

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2003

2004

2005

2006

2007

2008

2009

2010

Year

Num

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AugustJulyJuneMay

Alaska May~August:1986-2010N:62º-68.5º,W:141º-163º

Ave. flash 31,000 (excluding '04,'05,'07)

Ave. flash 43,000 (including '04,'05,'07)

Detection accuracy 2~4 kmDetection efficiency 40~80%

Lightning detection network updraded

Detection accuracy 0.5~2 kmDetection efficiency 80~90%

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Detection accuracy 2~4 kmDetection efficiency 40~80%

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Y*+AHD>1*+>Satellite observation (MODIS daily hotspot) and lightning data were successfully used to show “obvious link” in Alaskan fires. Analysis results for largest fire year (2004) allowed following conclusions: 1.! Occurrence of large fire may be closely related to not only the

amount of rainfall during lightning period but also forest conditions (dryness of vegetation).

2.! There was a time lag (about several days or more) between fire discovery date and fire expansion date (period) due to weather condition (change from cold air flow condition to warm condition or from lightning weather to fire weather).

3.! Analysis results using daily hotspot data could explain activity of spatial and temporal fires. This implies “Advanced New Fire Forecast”.

4.! Fire weather conditions near Fairbanks were confirmed: temperature > 25 , wind direction = ENE & WSW, wind direction change from NW to ENE, wind speed > 6 m/s, 2~3 m/s, relative humidity < 40 %.

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