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Severe Weather Training Insert Your Company Name

Severe Weather Training Insert Your Company Name. Symptoms of Bad Weather. High Winds Sustained (greater than 15 minutes) with wind speed of > 60 mph. Down Burst. A strong downdraft with an outburst of damaging winds on or near the earth’s surface

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Severe Weather Training Insert Your Company Name

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  1. Severe Weather Training Insert Your Company Name

  2. Symptoms of Bad Weather • High Winds • Sustained (greater than 15 minutes) with wind speed of > 60 mph

  3. Down Burst • A strong downdraft with an outburst of damaging winds on or near the earth’s surface • Responsible for the “wind shear” which has caused a number of airliner accidents in the 1970’s and early 1980’s • When people experience property damage from a downburst, they assume that they were struck by a tornado • In fact, the strongest downburst have wind gusts to near 130 mph and are capable of the same damage as a medium-sized tornado

  4. WIND SPEED ESTIMATES Speed (MPH) Effects 55-72 Damage to chimneys and TV antennas; pushes over shallow rooted trees 73-112 Peels surface off roof, windows broken; trailer houses overturn 113+ Roofs torn off houses; weak buildings and trailer houses destroyed; large trees uprooted

  5. WIND SPEED ESTIMATES • Speed (MPH) Effects • 25-31 Large branches in motion; • whistling in telephone wires • 32-38 Whole trees in motion • 39-54 Twigs break off of trees; • wind impedes walking

  6. Flash Floods • Defined as a rapid rise in water usually during or after period of heavy rain • Variations in soil type, terrain, and urbanization result in a wide variation in the amount of runoff which will occur during and after a given amount of rain.

  7. Flash Floods • Underrated thunderstorm threat • Many recent deaths associated with flash flooding occurred because people attempted to drive their vehicles across a flooded low-water crossing and were swept away by the floodwaters • Less than two feet of moving water is needed for a vehicle to be swept away

  8. Funnel Clouds • Defined as a violently rotating column of air which is not in contact with ground • Marked by a funnel-shaped cloud extending downward from the cloud base • If the violently rotating air column reaches the ground, it is called a tornado

  9. TORNADO • A tornado is defined as a violently rotating column of air in contact with the ground and pendant from a thunderstorm • A visible funnelDOES NOT have to extend to the ground for a tornado to be present • Look for a rotating cloud of dust and debris underneath a funnel cloud as evidence that it has touched the ground

  10. Tornado • Tornado Watch • Means conditions are favorable for a tornado to occur • Tornado Warning • Indicates that an actual tornado has been reported by the National Weather Services or has been sighted in the vicinity

  11. Severe Lightning • Condition that occurs in conjunction with thunderstorms and / or tornadoes, as reported by the National Weather Service

  12. LIGHTNING • Number 1 killer among weather phenomena • Two main threats • Intense heat of the lightning stroke (15,000 degrees Celsius) • Extreme current (30,000 amperes)

  13. HAIL • Usually not a direct threat to life but giant hailstones (2 inches or more in diameter) can reach speeds of 100 mph as they fall to earth • Hail larger than golf ball size may damage windshields

  14. HAIL SIZE ESTIMATES Pea.................0.25 Golf ball ............1.75 Penny.............0.75 Tennis Ball.........2.50 Quarter .........1.00 Baseball ...........2.75 Half Dollar ...1.25 Grapefruit ........4.00

  15. Hurricane Sustained (greater than 15 minutes) wind speed > 73 mph, as reported by the National Weather Service

  16. The map symbol for a hurricane is somewhat confusing because it does not show an eye in the middle • The symbol that depicts an eye in the middle is actually the symbol for a tropical storm, the beginning of a hurricane

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