Extended Abstract (476K)4.2
An initial analysis of relationships between 2- and 10-minute averaged winds at 10, 6, and 1.8 meters: implications for fire behavior and danger applications
Larry S. Bradshaw, USDA Forest Service, Missoula, MT; and E. Petrescu and I. Grenfell
Recently there has been much discussion about the relationship between traditional 10-minute average NFDRS wind observations and forecasts at 20-feet, 2-minute average 10-meter winds from NWS ASOS sites and mid-flame (1.8 meter) masts from the new Fire RAWS. This paper reports on an initial investigation based on 3 RM Young ultrasonic anemometers located at 10-meters, 6-meters (20-feet), and 1.8 meters (6-feet) above the ground on the same mast. Sampling at a rate of 10 Hz, 1-second averaged data were collected at a number of locations in western Montana during the summer of 2003. Characteristics of the wind speed probability distributions and correlations between the sampling heights and averaging times are presented.
Session 4, Mesoscale Meteorology II
Wednesday, 19 November 2003, 4:30 PM-5:30 PM
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