Jefferson County - East-West Gateway Coordinating Council

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134 Comments: Jefferson County – Section 2 Recommendation: The EWGCC Hazard Mitigation Planning Committee will support continuation of mitigation activity Operation Weather Survival that will assist at risk residents during heat waves in the region.
A Regional Overview All-Hazard Mitigation Plan 135 HAZARD ANALYSIS NARRATIVE Hazard: Tornadoes/Severe Storms (Downbursts, Lightening, Hail, Heavy Rains, Wind) Description of Hazard (Type of hazard, pathways/areas likely affected, type of damage, etc.) Tornadoes are cyclical windstorms or violently rotating column of air. Accompanying storm activities include severe thunder/electrical storms, down-bursts, straight-line winds, lightning, hail and heavy rain. The average forward speed of a tornado is about 30 m.p.h. but may vary from nearly stationary to 70 m.p.h. The average pathway may vary in any direction, but the average tornado moves from southwest to northeast. Tornadoes are most likely to occur between 3:00 p.m. and 9:00 p.m. but may ensue at any hour of the day. Any person or structure at any location could be damaged by a tornado. The amount of damage depends on 1). The strength of the tornado, 2) the tornado’s proximity to the person/structure, 3) the strength the structure, 4) how well a person is sheltered. Damage can range fro very slight to total. On average, tornadoes stay on the ground 30 minutes, covers 15 miles, is up to 300 years wide, although NOAA determined that the mean path length was 2.27 miles long and .14 square mile path in length. Most storms move from southwest to northeast and occur between 3 and 9 in the afternoon hours in the spring months. Historical Statistics (Frequency, strength, # of lives lost, # of injuries, economic losses, etc.) Tornadoes are classified according to the F-scale (developed by Dr. Theodore Fujita). The F-scale ranks tornadoes according to its wind speed based on the severity of damage it caused. On May 27, 1896, 18 tornadoes struck St. Louis, resulting in 306 deaths and $15 million dollars in damages. On May 9, 1927 two tornadoes struck St. Louis, the first killing 306 people and causing $13 million in damages (between Missouri and Illinois). The second tornado killed 79 people and resulted in $23 million in damages. In November 1988 a tornado struck the St. Charles community. Businesses were able to obtain Small Business Loans to recover from this disaster. Since 1950, St. Louis County has had 23 tornadoes, St. Charles has had 24, St. Louis City has had 3, Jefferson County has had 23 and Franklin has had 16 tornadoes. Since 1950, 11 deaths in St. Louis City have resulted from tornadoes. In this same period for St. Louis County, 13 deaths have resulted, one death in Jefferson County, and none in St. Charles and Franklin Counties. F-SCALE SPEED IN M.P.H. COUNTY TORNADOES BY F-SCALE SINCE 1950? FO 40-72 F0 16 % F1 73-112 F1 32 F2 113-157 F2 32 F3 158-206 F3 14 F4 207-260 F4 5 F5 261-318 F5 0
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Jefferson County Hazard Mitigation
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16 1,2,3,4,5,6,7,8,9, Revise flood-
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18 Encourage development of jurisdi
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Jefferson County - East-West Gateway Coordinating Council

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