Criteria for Severe Weather National Weather Service CriteriaNational Weather Service Criteria HailHail Dime size or largerDime size or larger WindWind 58mph or greater58mph or greater
Comes in many shapes & sizesComes in many shapes & sizes Pea SoftballPea Softball Rarely larger than softballRarely larger than softball Can cause substantial damage to cropsCan cause substantial damage to crops Largest hail usually generated in supercell thunderstormsLargest hail usually generated in supercell thunderstorms Hail
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 Often looks worse than it really isOften looks worse than it really is Plants can usually grow backPlants can usually grow back Highest potential for severeHighest potential for severe damage is during flowering damage is during flowering Secondary ProblemsSecondary Problems Fungal InfectionsFungal Infections
Caused by Bow Echo’s, Squall Lines, or Derecho’sCaused by Bow Echo’s, Squall Lines, or Derecho’s Winds which cause most damage are >58mphWinds which cause most damage are >58mph Derecho winds can be >100mphDerecho winds can be >100mph Damage to crops can be extensiveDamage to crops can be extensive Macro and Microbursts also cause damageMacro and Microbursts also cause damage Winds often >70mphWinds often >70mph Straight Line Winds
Straight Line Wind Damage Damage looks worse than it is in most casesDamage looks worse than it is in most cases Yield losses vary depending on time of damageYield losses vary depending on time of damage Can lead to secondary problemsCan lead to secondary problems Goose-neckingGoose-necking Increased risk for fungal infectionIncreased risk for fungal infection Decreased nutrient and water uptakeDecreased nutrient and water uptake Causes harvest problemsCauses harvest problems