WIND DANGERS

compiled by Dee Finney

CURRENT EARTH ROTATION CHARTS

FROM:  http://k12.ocs.ou.edu/teachers/reference/atmosforce.html

Wind speed and direction respond to pressure gradient forces that exist between high and low pressure areas. In the Northern Hemisphere and because of the rotation of the earth, winds circulate in a clockwise fashion around areas of high pressure and in a counter-clockwise manner around regions of lower pressure. Air pressure decreases relatively slowly with height in regions dominated by warm air and relatively rapidly with height in areas where cold air prevails. As a result, wind patterns in the upper atmosphere tend to flow in an oscillating manner around major pockets of warm and cold air.

Wind results from physical forces that act on the air.

A force is an influence on a body which causes the body to accelerate (change speed or direction). Newton's First Law of Motion states that a body at rest will remain at rest, and a body in motion will remain in motion unless acted upon by an unbalanced force. If forces balance (no net force), then we have either no motion or uniform motion in a straight line.

Newton's 2nd Law of Motion states that the acceleration (rate of change of velocity) of a body is directly proportional to the net force upon the body, or F = ma, where F = force, m = mass, and a = acceleration.

Gravitational force- keeps the molecules in the atmosphere from moving into space. Gravity's influence is stronger near the earth's surface and weaker aloft.

Vertical pressure gradient force- closely balances gravity so that all the molecules in the atmosphere are not forced into the lowest meter above the ground. The vertical pressure gradient force results from molecules in the high pressure near the earth's surface trying to move upward where the pressure is lower.

Coriolis force- the force that results from Earth's rotation. The Coriolis force solely results from living on a rotating object -- Earth. It acts only on objects moving with respect to the earth's surface (e.g., the air, planes, birds, missiles, etc.). It is only significant over long distances (e.g., hundreds or thousands of miles) and long time spans (e.g., 12 hours or longer). Hence, tornadoes are not influenced by the Coriolis force. Neither is the water draining in your sink. The Coriolis force always will deflect objects to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. The Coriolis force will never change the speed of an object, only its direction

Friction- the drag exerted on the air by the earth's surface (e.g., plants, trees, buildings, mountains, etc.).

Centrifugal force- the tendency for a body to resist a change in direction

If Earth did not rotate, air currents would flow directly from areas of high pressure to areas of low pressure. However, because Earth does rotate, air currents ultimately become involved in a tug-of-war between pressure gradient forces and the Coriolis force. The result is that air circulates counterclockwise around areas of low pressure in the Northern Hemisphere and clockwise around areas of high pressure

 

DANGER OF WIND IN MOBILE HOMES

HURRICANES AND SPINOFF TORNADOS

 

AVOID TRAVEL IN THESE CONDITIONS

Blowing/shifting snow: Loose snow and wind force more than 11 m/sec (fresh breeze, 18 knots) with blowing snow partially obstructing road view and/or danger of road conditions deteriorating within the next few hours.

 Blizzard: Wind force 16 m/sec (moderate gale, 30 knots) or more and snowfall, difficult traveling weather, considerable danger of road conditions worsening at short notice.

 Fog: Heavy fog with obstructed vision. In the interest of traffic safety motorists are advised to proceed with caution.

 WIND NEWS - 2002

ALASKA - WINTER STORM WARNINGS

DOPPLER - WEATHER WARNINGS

MOUNTAIN WEATHER AND WINDS

PACIFIC OCEAN WEATHER AND WINDS

PROTECTING YOURSELF FROM COLD AND WIND

TORNADO  SAFETY

TORNADO DANGER SIGNS

WIND DIRECTIONS IN GREAT BRITAIN

TORNADO

Wind gusts of up to 80mph were reported and a tornado was confirmed in eastern . ... Within four km., the wind would be of tornado force, six hundred km. ...
www.greatdreams.com/tornado_database.htm -

THE COMING GLOBAL SUPERSTORM

Just that quick, the wind and rain hit the house and rushed past, ... That wind had to have been over 200 miles an hour. The rain and wind was viscious. ...
www.greatdreams.com/superstorm.htm

POLAR MOTION - A PROPHECY - THE SCIENCE

SOLAR WIND: This morning Earth entered a solar wind stream flowing from a coronal hole on the Sun. NASA's ACE spacecraft, which monitors the solar wind, ...
www.greatdreams.com/motion.htm

Florida's Hurricane History: September 1935

Sep 14, 2000 ... All wind instruments were destroyed, expert engineering analysis of the damage indicated that gusts were in the range of 150-200 mph at ...
www.greatdreams.com/1935.html

SOLAR WEATHER  APRIL 201-  SOLAR WIND

The runaway atmosphere is heading our way in the form of a solar wind stream. ..... April 4th marked the beginning of a major solar wind storm, ...
www.greatdreams.com/solar/2010/space-weather-april-2010.html

SPACE WEATHER - MAY 2010

  SOLAR WIND
The next storm is due on May 31st or June 1st when a solar wind stream is ... A solar wind stream flowing from this hole could reach our planet on or about ...
www.greatdreams.com/solar/2010/space-weather-may-2010.html

SOLAR WEATHER - SEPTEMBER - 2010

  SOLAR WIND
--SWEAP, the Solar Wind Electrons Alphas and Protons Investigation: The most ... WISPR can actually see the solar wind, allowing it to image clouds and ...
www.greatdreams.com/.../space-weather-september-2010.html

  1. HURRICANE LENNY - NOVEMBER, 1999

    On Tuesday, two fishermen drowned off Colombia's coast, and 540 people were left homeless after heavy wind and rain destroyed half the buildings in a ...
    www.greatdreams.com/lenny.htm
  2. LILI - THE HURRICANE - 2002

    Sep 30, 2002 ... (Oct. 2, 2002) - Packing 110 mph wind, Hurricane Lili gained strength and churned Wednesday toward the Gulf Coast, where residents braced ...
    www.greatdreams.com/lili.htm

     

    Search Results

    1. MAGNETOSPHERE

      the penetration of the solar-wind magnetic field, the structure of the ... it more vulnerable than usual to solar wind disturbances. ...
      www.greatdreams.com/magnetosphere_database.htm - Cached - Similar
    2. ENERGY IS NO JOKE

      Wind power is the conversion of wind energy into a useful form, such as electricity, using wind turbines. At the end of 2007, worldwide capacity of ...
      www.greatdreams.com/energy/energy-cartoons.htm -
    3. SPACE WEATHER JUNE 2010

      Next up: A solar wind stream is due to hit Earth's magnetic field on June 26th, possibly sparking a new round of geomagnetic activity. ..
      www.greatdreams.com/solar/.../space-weather-june-2010.html
    4. YEAR 2000 - HURRICANE SEASON

      The storm, dubbed "Little Debby" so far, is expected to become a hurricane again with wind speeds of up to 105 mph by an expected Friday approach southeast ...
      www.greatdreams.com/hurr2000.htm -
    5. SOLAR WEATHER and some interesti

      Solar wind speed: 405.2 km/sec density: 4.9 protons/cm3 ...... A solar wind stream flowing from the indicated coronal hole could reach Earth on or about Jan ...
      www.greatdreams.com/solar/.../space-weather-jan-2009.htm
    6. SAVE THE WORLD

      Apr 20, 2008 ... I didn't have the brilliant foresight to see it, but it's pretty common in business that where you wind up is not where you thought you'd be ...
      www.greatdreams.com/bamboo.htm -
    7. SIGNS IN THE SKY - ASTRONOMY

      The solar wind is still blowing, but the crack has closed, ... The display was sparked by a solar wind stream which hit Earth's magnetic field on July 21st. ...
      www.greatdreams.com/signs.htm -
    8. SOLAR WEATHER

      In 2008 and 2009, the sun set Space Age records for low sunspot counts, weak solar wind, and low solar irradiance