Jefferson County - East-West Gateway Coordinating Council

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154 HAZARD: Tornado JEFFERSON COUNTY HAZARD PROFILE WORKSHEET POTENTIAL MAGNITUDE (Percentage of jurisdiction that can be affected): _ Catastrophic: More than 50% _ Critical: 25% to 50% _ Limited: 10 to 25% X Negligible: Less than 10% <strong>Jefferson</strong> <strong>County</strong> – Section 2 FREQUENCY OF OCCURRENCE: _ Highly Likely: Near 100% probability in next year X Likely: Between 10 and 100% probability in next year, or at least one chance in 10 years _ Possible: Between 1 and 10% probability in next year or at least one chance in next 100 years. _ Unlikely: Less than 1% probability in next 100 years SEASONAL PATTERN: Tornadoes normally occur in the spring and early summer months. AREAS LIKELY TO BE AFFECTED MOST (BY SECTOR): Areas most likely to be affected are dependent upon weather system and storm track. PROBABLE DURATION: Tornadoes move through at an average speed on 30 miles per hour. POTENTIAL SPEED OF ONSET (Probable amount of warning time) X Minimal (or no) warning _ 6 to 12 hours warning _ 12 to 24 hours warning _ More than 24 hours warning EXISTING WARNING SYSTEMS: National Weather System and tornado weather sirens. COMPLETE VULNERABILITY ANALYSIS: The EWGCC region is extremely vulnerable for tornado hazards, with 115 total tornadoes recorded by the National Weather Service. St. Louis has a history of six F4 devastating tornadoes. This analysis is based on an F4 tornado causing damage in 5% of the county. In the developed portion of the county, it was estimated that 10,500 persons and 2,500 buildings valued at $245 million dollars could be affected by this disaster. In the
A Regional Overview All-Hazard Mitigation Plan 155 undeveloped portion of the county, it was estimated that 4,500 persons and 1,750 buildings valued at $131million dollars could be affected by this disaster.
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Jefferson County Hazard Mitigation
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Page 245 and 246: 8 Federal Sources TITLE: PRE-DISAST
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Page 265 and 266: 14 Community Action Type of Strateg
Page 267 and 268: 16 1,2,3,4,5,6,7,8,9, Revise flood-
Page 269: 18 Encourage development of jurisdi
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Jefferson County - East-West Gateway Coordinating Council

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