Wildfires - June 2008
Despite a relatively high fire danger across the southwestern U.S., and widespread dryness in 10–hr fuel moisture, June began with only four large fires in Florida and one in western Texas. By mid–June most of the large fires in Florida had been contained, but several new large fires flared up in Northern California and the Southern Plains. Additional large fires were reported in Nevada, Utah, Alaska and West Virginia. Unfortunately, by the end of the month numerous large fires were raging in Northern California and Arizona, many due to lightning strikes. Several large fires were also being battled in other western states, as well as the western Carolinas, Alaska and Louisiana.
Although drought conditions have improved slightly in North Dakota and western Alaska since the end of May, conditions have worsened across the West, South and Southeast U.S., with many areas transitioning from moderate or severe to extreme or exceptional drought through June. Hawaii and southern Puerto Rico continued to experience substantial moisture deficits, and parts of New England were also abnormally dry as of the end of the month.
As of June 30th, there have been 36,761 wildland fires and more than 2.1 million acres burned so far this year, according to the National Interagency Fire Center (NIFC). Thanks in part to June rainfall and the efforts of fire fighters, the year 2008 now ranks third behind 2006 and 2002 in quantity of acreage burnt to date — down from second at the end of May — and the number of fires falls well below the 1998–2008 average. Approximately 466 large fires have been contained to date in 2008.
Through the month of June, fire danger, which had been high at the end of May, greatly diminished across New Mexico and western Texas. However, by the middle of the month, fire danger began to increase across the Great Basin and worsen in Colorado, Arizona and Southern California. At the end of the month, fire danger was highest across Nevada and Southern California, with the highest danger around Las Vegas, Nevada, according to the U.S. Forest Service (USFS) – Wildland Fire Assessment System.
According to the U.S. Forest Service (USFS) Experimental Fire Potential Index, large portions of the western United States, stretching from Washington and Idaho south to Southern California and western Arizona, exhibited the greatest potential for wildfire activity. Although drought continues to impact the South and southeastern U.S., fire potential is relatively low in those regions.
2008 Wildfire Statistics(Source: NIFC)
|Year–To–Date Totals as of June 30th||Nationwide Number of Fires||Nationwide Number of Acres Burned|
(2003 – 2007)
(1999 – 2008)
Dead fuel moisture levels remained critically low across portions of the West and Southwest during June. The 10–hour fuel moisture levels also dried out noticeably between June 8th and June 15th over much of the western United States. By June 30th, 10–hour fuel moisture levels had recovered slightly in parts of the Southwest, but dried out across portions of the western Central Plains and east into Wisconsin.
Medium to larger fuels (i.e., the June 30th 100–hr and 1000–hr fuel moistures) continued to be dry across most of the central and southern states of the western U.S., and showed substantial drying across the western and north–central parts of the U.S. from the start of the month.
The Keetch–Byram Drought Index (KBDI), a widely used drought index for fire risk, showed continuation of fire risk across Nevada and much of southern and western Texas, but improved conditions at the end of June for Florida, as compared to the June 8th KBDI.