Local mitigation strategy (LMS) - Volusia County Government

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SECTION 5: HAZARD PROFILESATMOSPHERIC HAZARDS5.2 HAIL5.2.1 BackgroundHail frequently accompanies thunderstorms and has potential to cause substantial damage. Early in thedevelopmental stages of a hail, ice crystals form within a low-pressure front due to the rapid rising ofwarm air into the upper atmosphere and the subsequent cooling of the air mass. Frozen dropletsgradually accumulate on the ice crystals until they develop sufficient weight to fall as precipitation. Hailprecipitation falls in sphere or irregularly shaped masses greater than 0.75 inches in diameter. The sizeof hailstones is a direct function of the size and severity of the storm. High velocity updraft winds arerequired to keep hail in suspension in thunderclouds. The strength of the updraft is a function of theintensity of heating at the Earth’s surface. Higher temperature gradients relative to elevation above thesurface result in increased suspension time and hailstone size.5.2.2 Location and Spatial ExtentHail is often produced during a thunderstorm event which has no geographic limitations to the area itaffects. Therefore, it is assumed that all of Volusia County is uniformly at risk to a hail event. Impactstypically include downed power lines and trees and damage to vehicles and mobile homes.5.2.3 Historical OccurrencesAccording to the National Climatic Data Center, there have been 106 recorded hail events in VolusiaCounty since 1983, as shown in Table 5.3 1 . Hail has caused a total of $231,092 (2009 dollars) inproperty damage, but has not resulted in any injuries or deaths. Hail sizes for these events rangefrom 1.00 inches to 2.75 inches in diameter. The locations of historically recorded hail events areshown in Figure 5.1. The emergency management officials from the Volusia County jurisdictionsdetermined that only hail that was greater than one inch in diameter was to be listed in Table 5.3.1 A Hail event that affects several jurisdictions on the same day is classified as a single event.Volusia County Multi-jurisdictional Local Mitigation StrategyFebruary 20105:5
SECTION 5: HAZARD PROFILESTABLE 5.3: Historical Hail ImpactsLOCATIONDATEMAGNITUDE(inches)DEATHS/INJURIESPROPERTYDAMAGE(2009dollars)DESCRIPTIONVolusia County 8/16/1963 1.00 0/0 $0 Not AvailableVolusia County 2/7/1971 2.75 0/0 $0 Not AvailableVolusia County 3/13/1971 1.75 0/0 $0 Not AvailableVolusia County 5/29/1971 1.75 0/0 $0 Not AvailableVolusia County 4/4/1973 1.00 0/0 $0 Not AvailableVolusia County 6/10/1975 1.75 0/0 $0 Not AvailableVolusia County 5/12/1976 1.50 0/0 $0 Not AvailableVolusia County 4/18/1978 1.00 0/0 $0 Not AvailableVolusia County 4/8/1982 1.50 0/0 $0 Not AvailableVolusia County 4/29/1982 1.75 0/0 $0 Not AvailableVolusia County 6/8/1985 1.00 0/0 $0 Not AvailableVolusia County 6/18/1987 1.75 0/0 $0 Not AvailableVolusia County 5/24/1988 1.50 0/0 $0 Not AvailableVolusia County 2/21/1989 1.00 0/0 $0 Not AvailableVolusia County 3/23/1989 1.25 0/0 $0 Not AvailableVolusia County 5/1/1989 1.00 0/0 $0 Not AvailableVolusia County 6/26/1990 1.00 0/0 $0 Not AvailableVolusia County 5/2/1992 1.00 0/0 $0 Not AvailableEdgewater 1/11/1993 1.50 0/0 $77,700Daytona Beach 3/31/1993 1.75 0/0 $0Daytona Beach 6/19/1995 2.50 0/0 $36,809Daytona Beach 3/28/1996 1.75 0/0 $0Strong downburst winds damaged 9mobile homes. Most had aluminumawnings, carports, and family roomsripped away. Trees and power lines weredowned. Up to golf ball-sized hail alsofell.Golfball-sized hail fell at the DaytonaBeach Airport.Severe thunderstorms blew down dozensof trees in Deltona and produced oneinch-diameter hail.Strong downburst winds blew downtrees destroyed a pool screen andproduced two and one-half-inchdiameterhail in the Spruce Creek Village.Volusia County Multi-jurisdictional Local Mitigation StrategyFebruary 20105:6
Page 1: VOLUSIA COUNTY, FLORIDAMULTI-JURISD
Page 5 and 6: SECTION 1: INTRODUCTION1.2 PURPOSET
Page 7 and 8: SECTION 1: INTRODUCTIONand land use
Page 9 and 10: SECTION 2: PLANNING PROCESSSECTION
Page 11 and 12: SECTION 2: PLANNING PROCESSPlan Out
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Page 17 and 18: SECTION 3: COMMUNITY PROFILESECTION
Page 19 and 20: SECTION 3: COMMUNITY PROFILETABLE 3
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SECTION 5: HAZARD PROFILESGEOLOGIC
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SECTION 5: HAZARD PROFILESTABLE 5.1
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SECTION 5: HAZARD PROFILESTABLE 5.1
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SECTION 5: HAZARD PROFILES5.13 TSUN
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SECTION 5: HAZARD PROFILESthe entir
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SECTION 6: VULNERABILITY ASSESSMENT
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SECTION 7: CAPABILITY ASSESSMENTapp
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SECTION 7: CAPABILITY ASSESSMENT7.3
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SECTION 7: CAPABILITY ASSESSMENT7.3
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SECTION 7: CAPABILITY ASSESSMENTTAB
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SECTION 8: MITIGATION STRATEGYThe s
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SECTION 8: MITIGATION STRATEGYTABLE
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SECTION 8: MITIGATION STRATEGYhave
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SECTION 9: MITIGATION ACTION PLANTa
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PriorityHazard(s)MitigationTechniqu
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SECTION 10: PLAN MAINTENANCE PROCED
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APPENDIX B: BYLAWS AND OPERATING PR
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Article IV. ObjectivesThe objective
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B. Meetings, Voting and Quorum1. Me
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• Periodic review of the status o
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In its discretion, the LMS Working
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This analysis may be conducted by t
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• The participants proposing the
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• The currently approved listing
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LMS Working Group, with the support
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Volusia PreparesTHE VOLUSIA COUNTY
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Volusia County Local Mitigation Str
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jurisdictions, the Florida Division
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file://C:\Documents and Settings\18
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Aug. 17, 2009Contact: Shelley Szafr
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APPENDIX F: INDIVIDUAL JURISDICTION
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PriorityHazard(s)Mitigation Techniq
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