SPC National Fire Weather Outlooks March 4, 2005 Dr. Phillip Bothwell.

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Presentation transcript:

SPC National Fire Weather Outlooks March 4, 2005 Dr. Phillip Bothwell

 Those started by lightning account for more than 50 percent of all total acreage burned each year (NIFC(2000)).  In 2000, during one of the most severe fire seasons on record, lightning started 18,417 wildfires.  Lightning caused more than 99% of the wildfires across the Northern Rockies. In addition, lightning killed two fire fighters.  At that time, it required the largest peacetime mobilization of resources in our nation’s history.

SPC Fire Weather Outlooks are available on both the WEB and AWIPS New in SPC will be testing and evaluating an experimental Day 3 through 8 WEB graphic (“in house” for *.gov domains) for expected critical fire weather areas graphic scheduled to be available on WEB – unrestricted (after test and evaluation)

SPC Web Feedback page We do it every day!!

Regional critical relative humidity values used at the SPC SPC considers regional differences in fire weather criteria…(humidity closely follows Red Flag Criteria)

LTG CLIMO: Probability of one or more CG flashes / 40x40 km grid box / 3 hrs. Centered on July UTC15-18UTC UTC21-00UTC

Example of a 9 to 12 hour forecast and the actual lightning (in each 40 x 40 km grid box) 8/15/04. Valid 21-00UTC.

High Resolution (1km) Land use map and National Fire Weather Zone Map

High Resolution (1km) Land use map-Zoomed into the County level for Southern California. National Fire Weather Zone Map/with IDs (Red) and County maps (Blue)

28 day rainfall accumulation across the US ending on Feb 24, 2005 “Wet” “Dry” (observed surface rainfall from all available reporting stations)

28 day rainfall accumulation across the US ending on March 3, 2005 Note One Week Difference over Florida

7 day rainfall accumulation across the US ending on March 3, 2005

Web example of Outlook 10/26/03

EXAMPLE – California Wildfires Oct 2003 Day 2 Forecast valid Sunday, Oct. 26th

EXAMPLE – California Wildfires Oct 2003 Day 1 Forecast Valid Sunday, Oct. 26

Southern California Wildfires – October 2003 SPC use of (GOES) “Automated” Bio-mass Burning Algorithms (ABBA) (24 hr accumulation of all images) Red and black indicate wildfires – 4 km resolution.

Dry Thunderstorm (Dry Lightning) – a subset:  A storm produced by a cumulonimbus cloud(s) accompanied by lightning, gusty wind, and little or no precipitation (i.e., 0.10 inch or less)  SPC will focus on situations where numerous dry thunderstorms are expected- “Lightning Bust” Lightning Forecasts  The Difference between a Wet or Dry Thunderstorm

Example of a Dry Thunderstorm Forecast and the actual lightning (contours of 1 or more, 3, 10, 30, 100 and 300 or more flashes per 24 hours) and 24 hour precipitation (magenta numbers) July 12 to 13 th 2002

 Those started by lightning account for more than 50 percent of all total acreage burned each year (NIFC(2000)).  In 2000, during one of the most severe fire seasons on record, lightning started 18,417 wildfires.  Lightning caused more than 99% of the wildfires across the Northern Rockies. In addition, lightning killed two fire fighters.  At that time, it required the largest peacetime mobilization of resources in our nation’s history.