Skip to main content

Table 9 Wind ramping characteristics during drift events with applicator records, AgWeatherNet (AWN) data, 2000–2015

From: Examining the role of wind in human illness due to pesticide drift in Washington state, 2000–2015

Spray window Length (hours) Drift events (n) Wind speed (mph) Wind direction (degrees) Both rampsb
AM SD CV Ramp eventsa SD Range Ramp eventsa
Short 0.25–1.75 20 4.43 1.50 33.8 8 0.68 77.6 3 2
Medium 2.00–7.00 19 5.74 1.53 26.6 11 0.81 129.1 4 3
Long 7.25–15.75 18 4.78 1.79 37.5 13 1.16 232.0 9 7
Total 0.25–15.75 57 4.98 1.61 32.3 32 0.90 143.5 16 12
  1. AM Arithmetic mean; SD Standard deviation; CV Coefficient of variation
  2. a. A ramp event was defined as a drift event spray window with a wind speed or wind direction standard deviation greater than 1
  3. b. Indicates the number of drift events that had both a wind speed ramp and a wind direction ramp