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Straight Line Winds, Hail, & Crop Damage

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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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yearly damage statistics for iowa
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/

criteria for severe weather
Criteria for Severe Weather
  • National Weather Service Criteria
    • Hail
      • Dime size or larger
    • Wind
      • 58mph or greater
slide4
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
slide5

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

hail damage
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
straight line winds
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
straight line wind damage
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
slide14

Day after storm July 10th

Same field July 16th

references
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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