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Section 4 4-26 Ramsey County Multijurisdictional Hazard Mitigation Plan | July 2012 Location Date Type Magnitude Death Injuries 114 Vadnais Hgts 5/30/2011 Hail 0.75 in. 0 0 115 White Bear Lake 5/30/2011 Hail 1.00 in. 0 0 116 Arden Hills 7/1/2011 Hail 0.88 in. 0 0 117 Arden Hills 7/19/2011 Hail 1.00 in. 0 0 118 New Brighton 7/19/2011 Hail 1.00 in. 0 0 119 Arden Hills 7/19/2011 Hail 1.00 in. 0 0 120 St Paul 7/19/2011 Hail 0.88 in. 0 0 121 Falcon Hgts 7/19/2011 Hail 1.00 in. 0 0 122 Roseville 7/19/2011 Hail 1.25 in. 0 0 123 St Paul 7/19/2011 Hail 1.25 in. 0 0 124 Lauderdale 7/19/2011 Hail 1.00 in. 0 0 125 St Paul 8/1/2011 Hail 0.75 in. 0 0 Vulnerability Assessment Data on the probability and frequency of occurrence of hailstorms is limited, with little recent research. The available data shows that only a localized area along the border of northern Colorado and southern Wyoming experiences hailstorms eight or more days each year. Outside of the coastal regions, most of the United States experiences hailstorms at least two or more days each year. Hailstorms occur more frequently during the late spring and early summer, when the jet stream migrates northward across the Great Plains. This period has extreme temperature changes from the ground surface upward into the jet stream, which produces the strong updraft winds needed for hail formation. Peak periods for hailstorms coincide with the Midwest’s peak agricultural seasons for crops such as wheat, corn, barley, oats, rye, tobacco, and fruit trees. Long-stemmed vegetation is particularly vulnerable to damage by hail impacts and winds. The land area affected by individual hail events is not much smaller than that of a parent thunderstorm, an average of 15 miles in diameter around the center of a storm. The entire population of Ramsey County is vulnerable to a hail incident. Assets Exposed to Hazard  Property Risk/Vulnerability: It was determined that all critical facilities as well as all public, private, and commercial properties are susceptible to being affected by a hailstorm.  People Risk/Vulnerability: In evaluating vulnerability of the population in Ramsey County, it was determined that risk/vulnerability includes the entire population of the County since there is no way to determine the impact/magnitude of a hailstorm incident and no way to predict where and when a hailstorm will hit. People are vulnerable to the effects of hailstorms, including power outages, effects on transportation routes, damage to homes and cars, etc.  Environment Risk/Vulnerability: Risks to the environment are low should a hailstorm occur.