Book 4: Pinellas County Storm Tide Atlas - Tampa Bay Regional ...

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Volume 7-8 Tampa Bay Statewide Regional Evacuation Studies Program The MEOWs provide information to the emergency managers in evacuation decision making. However, in order to determine a scenario which may confront the county in a hurricane threat 24- 48 hours before a storm is expected, a further compositing of the MEOWs into Maximums of the Maximums (MOMs) is usually required. The MOM (Maximum of the MEOWs) combines all the MEOWs of a particular category. The MOMs represent the maximum surge expected to occur at any given location, regardless of the specific storm track/direction of the hurricane. The only variable is the intensity of the hurricane represented by category strength (Category 1-5). The MOM surge heights, which were furnished by the National Hurricane Center, have 2 values, mean tide and high tide. Mean tide has 0’ tide correction. High tide has a 1’ tide correction added to it. The Storm Tide limits include the adjustment for mean high tide. All elevations are now referenced to the NAVD88 datum. These surge heights were provided within the SLOSH grid system as illustrated on Figure 2. The range of maximum surge heights (low to high) for each scenario is provided for each category of storm (MOM) on Table 3. It should be noted again that these surge heights represent the maximum surge height recorded in the county from the storm tide analysis including inland and back bay areas where the surge can be magnified dependent upon storm parameters. Table 3 Potential Storm Tide Height (s) by County (In Feet above NAVD88) *Storm Strength Category 1 Hillsborough Manatee Pasco Pinellas Up to 8’ Up to 6’ Up to 9’ Up to 8’ Category 2 Up to 15’ Up to 12’ Up to 15’ Up to 14’ Category 3 Up to 21’ Up to 16’ Up to 21’ Up to 19’ Category 4 Up to 29’ Up to 22’ Up to 27’ Up to 26’ Category 5 Up to 33’ Up to 28’ Up to 34’ Up to 29’ *Based on the category of storm on the Saffir-Simpson Hurricane Wind Scale ** Surge heights represent the maximum values from SLOSH MOMs Volume 7: Storm Tide Atlas Page 11
Volume 7-8 Tampa Bay Statewide Regional Evacuation Studies Program CREATION OF THE STORM TIDE ZONES The maps in this atlas depict SLOSH-modeled heights of storm tide and extent of flood inundation for hurricanes of five different intensities. As indicate above, the storm tide was modeled using the Maximum of Maximums (MOMs) representing the potential flooding from the five categories of storm intensity of the Saffir/Simpson Hurricane Wind Scale. Determining Storm tide Height and Flooding Depth SLOSH and SLOSH-related products reference storm tide heights relative to the model vertical datum, NAVD88. In order to determine the inundation depth of surge flooding at a particular location the ground elevation (relative to NAVD88) at that location must be subtracted from the potential surge height. 2 Surge elevation, or water height, is the output of the SLOSH model. At each SLOSH grid point, the maximum surge height is computed at that point. Within the SLOSH model an average elevation is assumed within each grid square. Height of water above terrain was not calculated using the SLOSH average grid elevation because terrain height may vary significantly within a SLOSH grid square. For example, the altitude of a 1-mile grid square may be assigned a value of 1.8 meters (6 feet), but this value represents an average of land heights that may Figure 4 Digital Elevation from LIDAR include values ranging from 0.9 to 2.7 meters (3 to 9 feet). In this case, a surge value of 2.5 meters (8 feet) in this square would imply a 0.7 meters (2 feet) average depth of water over the grid’s terrain. However, in reality within the grid area portion of the grid would be “dry” and other parts could experience as much as 1.5 meters (5 feet) of inundation. Therefore, in order to determine the storm tide limits, the depth of surge flooding above terrain at a specific site in the grid square is the result of subtracting the terrain height determined by remote sensing from the model-generated storm tide height in that grid square. 3 2 It is important to note that one must use a consistent vertical datum when post-processing SLOSH storm surge values 3 Note: This represents the regional post-processing procedure. When users view SLOSH output within the SLOSH Display Program, the system uses average grid cell height when subtracting land. Page 12 Volume 7: Storm Tide Atlas
Page 1 and 2: Florida Statewide Regional Evacuati
Page 3 and 4: Volume 7-8 Tampa Bay Statewide Regi
Page 5 and 6: Volume 7-8 Tampa Bay LIST OF MAPS (
Page 9 and 10: Volume 7-8 Tampa Bay Table 1 Statew
Page 11: Volume 7-8 Tampa Bay The Grid for t
Page 23 and 24: 32 82°42'0"W 33 34 82°41'0"W 35 8
Page 25 and 26: 27°42'0"N 32 82°42'0"W 33 34 82°
Page 27 and 28: Ramp Pt Aloha Dr 2nd St 1st St Palm
Page 29 and 30: 20th Ln S 2nd St 82°40'0"W 27°44'
Page 31 and 32: Corey Way The Pinellas Trl S Cir Dr
Page 33 and 34: Alley Treasure Ct 18th St 11th St J
Page 35 and 36: 27°50'0"N Lee Ave 180th Ave A Ave
Page 37 and 38: 73rd St 72nd St Anvil St 70th Ln 70
Page 39 and 40: 26 Onyx St 1st St W a Rd D 27°50'0
Page 41 and 42: 141st St Cir 6th Way 85 23.8 ft D 8
Page 43 and 44: 112thPl 108th 106th Ln eUnnamed Str
Page 45 and 46: 52nd Ln 52nd St 52nd 7 50th St 46th
Page 47 and 48: Dr 16th Ct 3 40 82°37'0"W 41 42 82
Page 49 and 50: Bamboo Ln Mia Cir Sophia Cir C Suns
Page 51 and 52: Sho L Oro Ct Dr Senora St 73rd St M
Page 53 and 54: Fri U y 7th Ln 36 82°40'0"W 37 82
Page 55 and 56: 16 82°52'0"W 17 18 82°51'0"W 19 8
Page 57 and 58: 6th St Sunny Park Rd Wood St Keysto
Page 59 and 60: Dr K St 27°58'0"N Parking Lot Entr
Page 61 and 62: West Ave Pineland Dr Chenango Ave S
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Harbor Cove St Cir r Ct Railroad Av
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82°50'0"W 3 20 21 82°49'0"W 22 23
Page 67 and 68:
Halsey BlackwoodCir Fiesta Dr Dr Co
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C Rd Ilene Dr Dr St Pelican Dr 36 8
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3 20 82°50'0"W 21 82°49'0"W 22 23
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Cherry Laurel Dr Leprechaun Kelly G
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28°6'0"N Forest Lakes Blvd 36 82°
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Dora Ave Polly Dr Pineridge Dr Dolp
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Dr Carnoustie 36 82°40'0"W 37 38 8
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3 20 82°50'0"W 21 82°49'0"W 22 23
Page 83 and 84:
Hama Dr Waterview Dr Julie Ln Grand
Page 85:
Rd 27.8 ft D 31 31 20 20 28°11'0"N
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