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Straight Line Winds, Hail, & Crop Damage

Straight Line Winds, Hail, & Crop Damage. Nathan Schnur 02/15/2008. Yearly Damage Statistics for Iowa. 2007 Hail - $2,768,390.12 Wind - 6, 163, 356.44 2006 Hail - $1,082,100.54 Wind - $1,483,016.11 2005 Hail - $897,598.88 Wind - $143, 879.78.

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Straight Line Winds, Hail, & Crop Damage

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  1. Straight Line Winds, Hail, & Crop Damage Nathan Schnur 02/15/2008

  2. Yearly Damage Statistics for Iowa • 2007 • Hail - $2,768,390.12 • Wind - 6, 163, 356.44 • 2006 • Hail - $1,082,100.54 • Wind - $1,483,016.11 • 2005 • Hail - $897,598.88 • Wind - $143, 879.78 Data taken from the USDA Risk Management Agency @ http://www.rma.usda.gov/

  3. Criteria for Severe Weather • National Weather Service Criteria • Hail • Dime size or larger • Wind • 58mph or greater

  4. Hail • Comes in many shapes & sizes • Pea  Softball • Rarely larger than softball • Can cause substantial damage to crops • Largest hail usually generated in supercell thunderstorms

  5. Right: Record setting hailstone which was 6.5 inches long and 17.3 inches around. It fell June 23, 2003 near Hastings, NE.

  6. Hail Damage • Often looks worse than it really is • Plants can usually grow back • Highest potential for severe damage is during flowering • Secondary Problems • Fungal Infections

  7. Straight Line Winds • Caused by Bow Echo’s, Squall Lines, or Derecho’s • Winds which cause most damage are >58mph • Derecho winds can be >100mph • Damage to crops can be extensive • Macro and Microbursts also cause damage • Winds often >70mph

  8. Straight Line Wind Damage • Damage looks worse than it is in most cases • Yield losses vary depending on time of damage • Can lead to secondary problems • Goose-necking • Increased risk for fungal infection • Decreased nutrient and water uptake • Causes harvest problems

  9. Day after storm July 10th Same field July 16th

  10. References Photos Courtesy of: • http://www.flickr.com/photos/wayneklick/133958153/ • http://www.uvm.edu/~sbraaten/MarbleheadMAhailstones.jpg • www.hprcc.unl.edu • http://www.agry.purdue.edu/ext/corn/news/articles.00/HailDamage-0522-Gallery.html • http://cropwatch.unl.edu/archives/2001/crop01-14.htm • http://www.flickr.com/photos/carquestguy/1207484104/ • http://www.extension.iastate.edu/nwcrops/storm-damage-02.htm References: • http://www.weather.gov/ • http://www.spc.noaa.gov/

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