2010 Metro Mitigation Plan

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how hot it feels to an individual when the effects of humidity are added to high temperature. Table 4-23 presents heat index values and their potential physical effects. The National Weather Service will issue a Heat Advisory for Nashville-Davidson County when daytime heat indices are at or above 105°F and nighttime heat indices are at or above 80°F. An Excessive Heat Warning is issued when the heat index equals or exceeds 115°F for three hours or longer with a minimum heat index of at least 80°F during a 24-hour period. An excessive heat advisory is also issued when heat advisory conditions persist for at least 3 days. In either of these scenarios, the heat becomes dangerous for a large portion of the population. Table 4-23. Heat Index Values and Effects Heat Index Values (Combination of Heat and Humidity) 80 to 90 degrees F 90 to 105 degrees F 105 to 130 degrees F 130 degrees and higher F Heat Index Effects Fatigue possible with prolonged exposure and/or physical activity. Sunstroke, heat cramps, and heat exhaustion possible with prolonged exposure and or physical activity. Sunstroke, heat cramps or heat exhaustion likely, and heatstroke possible with prolonged exposure and/or physical activity. Heatstroke/sunstroke highly likely with continued exposure. Cold Temperatures The National Weather Service will issue a Wind Chill Advisory for Nashville-Davidson County when wind-chill temperatures are expected to reach –4°F to –20°F. In 2001, NWS implemented an updated Wind Chill Temperature (WCT) index. This index was developed by the National Weather Service to describe the relative discomfort/danger resulting from the combination of wind and temperature. Wind chill is based on the rate of heat loss from exposed skin caused by wind and cold. As the wind increases, it draws heat from the body, driving down skin temperature and eventually the internal body temperature. Specifically, the new WCT index: Calculates wind speed at an average height of five feet (typical height of an adult human face) based on readings from the national standard height of 33 feet (10m); Is based on a human face model; Incorporates modern heat transfer theory (heat loss from the body to its surroundings, during cold and breezy/windy days); Metropolitan Nashville - Davidson County Hazard Identification Multi-Hazard Mitigation Plan Page 4-66 April 2010
Lowers the calm wind threshold to 3 mph; Uses a consistent standard for skin tissue resistance; and Assumes no impact from the sun (i.e., clear night sky). Past Occurrences There have been over a hundred recorded extreme temperature events in Davidson County since 1816. These events are presented in Appendix B. Likelihood of Future Occurrences On average, extreme temperature events have occurred once every 0.5 years, suggesting a similar recurrence period. Metropolitan Nashville - Davidson County Hazard Identification Multi-Hazard Mitigation Plan Page 4-67 April 2010
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Metropolitan Nashville-Davidson Cou
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4.2 Vulnerability Assessment ......
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LIST OF FIGURES Figure 2-1 Metropol
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USDA USGA WCT WNV United States Dep
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Metropolitan Nashville-Davidson Cou
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equired revision every 5 years. The
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Figure 2-1. Metropolitan Nashville-
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Subarea 1 - Joelton Joelton is loca
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Nashville, coupled with the concent
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Interstate 24 and Briley Parkway; t
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Figure 3-1. Similarity Between DMA
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Step 2: Involve the Public In addit
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Step 5: Assess the Problem Once the
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Table 4-1. Federal Disaster Declara
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Figure 4-2. Dams and Levees within
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management. Total storage capacity
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infrequent occurrence. There has ne
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Likelihood of Future Occurrences Th
Page 46 and 47: WATERSHED Table 4-3. Major Sources
Page 48 and 49: All streams within Metro Nashville,
Page 50 and 51: Nashville entered the flood insuran
Page 52 and 53: Damage Reach 1 Damage Reach 2 Damag
Page 54 and 55: Dry Creek Watershed The Dry Creek W
Page 56 and 57: performed. Primarily a rural portio
Page 62 and 63: Table 4-13. Pages Branch Damage Rea
Page 64 and 65: Table 4-14. Richland Creek Damage R
Page 70 and 71: 2.96. Damage Reach 12 is located on
Page 72 and 73: Cumberland River The Cumberland Riv
Page 74 and 75: The Southern Appalachian Seismic Zo
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Page 80 and 81: Figure 4-10. Evidence of Landslides
Page 82 and 83: Figure 4-11b. Slopes greater than 2
Page 84 and 85: Figure 4.13 Karst Hazard Map of Ten
Page 86 and 87: Human cases have been reported in a
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Page 90 and 91: The PDSI indicates that for the per
Page 94 and 95: Figure 4-18. Tennessee Forestry Dis
Page 100 and 101: Figure 4-21. Average Number of Thun
Page 104 and 105: Past Occurrences Several severe tor
Page 106 and 107: Past Occurrences There have been 16
Page 108 and 109: Critical Facilities Of significant
Page 110 and 111: Scientific Name Common Name Federal
Page 112 and 113: Historic and Natural Resources are
Page 114 and 115: West Nile Virus is spread through m
Page 116 and 117: DAM & LEVEE FAILURES Risk - Moderat
Page 118 and 119: WNQM AM 1300; WUPX UPN 30; WVOL AM
Page 120 and 121: Table 4-31. Earthquake Hazard Damag
Page 124 and 125: Figure 4-25 Tornado Siren Locations
Page 128 and 129: Table 4-33. Metropolitan Nashville-
Page 130 and 131: Evaluation of Existing Capabilities
Page 132 and 133: Harpeth River - Newsom Station Road
Page 134 and 135: 4. MWS has prioritized Capital Impr
Page 136 and 137: GOAL #3: Objective 3.1: Objective 3
Page 138 and 139: measures. Team members were allowed
Page 140 and 141: 2009 Update: Since the creation of
Page 142 and 143: Community Benefit: Potential fundin
Page 144 and 145: staff gages were installed in 2009
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Existing permit procedures should b
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Community Benefit: Life safety, Pot
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• Develop public-private partners
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2009 Update: MWS continues to send
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Metro officials should talk to thei
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COMPLETED ACTION 4: Double the numb
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• Construct tornado saferooms and
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With the adoption of this plan, the
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of the CPT. In addition, technical
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PROMULGATION STATMENT Date: TBD To:
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2. Multi-Hazard Mitigation Plan Sta
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METROPOLITAN GOVERNMENT OF NASHVILL
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Figure A-5 Mass email sent out from
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FLOODING-1 No. Location Historical
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FLOODING-3 No. Location Historical
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EARTHQUAKES-2 No. Date Richter Magn
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INFESTATIONS-1 West Nile Virus Loca
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WILDFIRES-1 No. Location Year Histo
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EXTREME COLD TEMPERATURES-2 No. Loc
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EXTREME HOT TEMPERATURES-1 No. Loca
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THUNDERSTORMS-1 No. Location Histor
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TORNADOES-2 No. Location Historical
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TORNADOES-4 No. Location Historical
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WINTER STORMS-1 No. Location Histor
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Metropolitan Nashville - Davidson C
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MCALPINE AV Cooper Creek DR 3 HART
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Trib. No. 3 GALLATIN PK OLD HICKORY
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HEATH RD BUFFALO RD HUNTWICK TRL HW
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NOLENSVILLE PK Sevenmile Creek DR 1
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Mill Creek Sorghum Branch ANTIOCH P
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HART LN BRICK CHURCH PK I- 65 §¨
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SUMMERLY DR W HILLWOOD DR DARDEN PL
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Stones River STEWARTS FERRY PK reek
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SAUNDERSVILLE RD SHUTE LN ANDREW JA
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Cumberland River RIVER RD RIVER ROA
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Cumberla nd River Browns Creek DR 1
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Metropolitan Nashville - Davidson C
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Metropolitan Nashville Department o
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Reconnaissance Report for Flood Dam
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Extreme Temperatures Chronology of
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2010 Metro Mitigation Plan

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