Beaufort wind force scale pdf in acrobat

Have the students add their own observations in the third column where they think they match the speed given on the beaufort wind scale. Beaufort wind force scale specifications and equivalent speeds for use at sea force equivalent speed wave height description map. Beaufort wind scale in miles per hour mph, knots and kilometers per hour kmh beaufort scale force wind in mph wind in knots wind in kmh description wave heightsvisible condition force 0 0 1 01 01 calm. Francis beaufort devised his scale of wind force in 1805, when serving aboard hms woolwich, and first mentioned it in his private log on january 1806, stating that he would, hereafter estimate the force of the wind according to the following scale. The beaufort scale is an empirical measure that relates wind speed to observed conditions at sea or on land. He developed the scale in 1805 to help sailors estimate the winds via visual observations. Hurricane wind scale is a 1 to 5 rating based on a hurricanes sustained wind speed. Beaufort s diary from 1806 showing his original scale. Acrobat can size the pages of a pdf to fit the selected paper size. Beaufort wind chart estimating winds speeds beaufort mph number range average terminology description 0 0 0 calm calm. Wave heights in the scale are for conditions in the open ocean, not along the shore. Beaufort number force wind speed kmh mph kts ms description land conditions visual 0 wind motion visible in smoke.

Beaufort wind scale beaufort number force of wind 0 calm 1 light air 2 light breeze 3 gentle breeze 4 moderate breeze 5 fresh breeze 6 steady breeze 7 moderate gale 8 fresh gale 9 strong gale 10 whole gale 11 storm 12 hurricane using the table above, classify the force of wind at a speed of 30 mph. A guide that helps mariners to estimate the wind speed over open water based on the observed wave conditions. The beaufort scale of wind force, internationally employed by weather agencies, was not designed for use. Beaufort wind scale lamontdoherty earth observatory. One of the first scales to estimate wind speeds and the effects was created by britains admiral sir francis. Scale or resize printed pages in acrobat and reader adobe support. One of the first scales to estimate wind speeds and the effects was created by britains admiral sir francis beaufort 17741857. Beaufort wind scale in miles per hour mph, knots and. A simple way to estimate wind speed approximate speed at 20 ft 6. One of the first scales to estimate wind speeds and the effects. Beaufort scale of wind force as adapted for use on forested areas of. Category 1 tornadoes on the fujita and torro scales also begin roughly at the end of level 12 of the beaufort scale, but are independent scales although the torro scale wind values are based on the 32 power law relating wind velocity to beaufort force.