The Storm Surge Hazard 2018 TS-8 Tropical Meteorology 2
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1 The Storm Surge Hazard 2018 TS-8 Tropical Meteorology 2 Daniel Noah National Weather Service Tampa Bay daniel.noah@noaa.gov
2 Tropical Cyclone Storm Surge Is a large dome of water, often 50 to 100 miles wide, that sweeps across the coastline where a tropical cyclone makes landfall 2
3 Creating Surge: Wind vs Pressure Lower central pressure associated with the storm causes the ocean to rise/bulge up However, the contribution of pressure to total storm surge is small compared to wind 3
4 Above Normal Tide 2012 Tropical Storm Debby Above normal tides in Tarpon Springs Beach erosion Bradenton to Sarasota
5 MacRae s boat ramp on the Homosassa River Crystal River 2012 Tropical Storm Debby
6 MacRae s boat ramp on the Homosassa River Crystal River 2012 Tropical Storm Debby
7 Above normal tides didn t let rain drain into Tampa Bay Tampa Bay Area Flooding Gulf Port St Pete Beach Tampa
8 2016 Hermine Satellite Loop
9 2016 Hermine Radar Loop
10 Hermine: Cedar Key Storm Surge
11 Cedar Key Surge Bar & Grill
12 2016 Major Hurricane Matthew
13 Hurricane Matthew Storm Surge Fort Pierce Beach Flagler Beach
14 Hurricane Matthew Storm Surge Saint Augustine Beach
15 The Power of Water Storm Surge creates a new inlet south of St Augustine Beach
16 Moving Water can be Deadly 3 ft 1 cubic yard of water weighs 1,700 pounds! 3 ft 3 ft
17 Before & After 2017 Hurricane Irma Key West Track of Irma
18 U.S. Hurricane Fatalities
19 Florida Hurricane Fatalities Direct Fatalities Drowning (Coastal) 53% Florida numbers will be similar to the U.S. numbers when we get a major storm surge into a populated area
20 Question # 1 My comfort Level with evaluating local storm surge factors is? A. I am an expert in local storm surge B. I have a good comfort level with local surge C. I have some knowledge of local surge D. I m really not sure about local surge E. What is local storm surge and why am I here?
21 Storm Surge Vulnerability Vulnerability Map Almost 8 Million Floridians Live in Evacuation Zones A, B, and C
22 Question # 2 What best describes your personal responsibility with storm surge areas? A. My area is in a storm surge vulnerable area B. I have mutual aid responsibilities in surge areas C. I have personal property in surge areas D. I have no interest in surge areas E. I am checking /Facebook, stop bothering me!
23 Some Quick Definitions Astronomical Tide is the daily variation in sea level due to the gravitational influence of the Sun and Moon Storm Surge is an abnormal rise of water generated by a storm Storm Tide is the total water level that includes tide plus the storm surge
24 Fernandina Beach Tides September 11-12, 1964 Hurricane "Dora" Fernandina Beach Astronomical Tide 9/11-12/ hours :00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00 0:00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 Friday, September 11, 1964 Saturday, September 12, 1964 Astro
25 Storm Surge, No Tide Hurricane "Dora" Fernandina Dora: Beach Storm 9/11-12/1964 Surge Almost 7 feet hours :00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00 0:00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 Friday, September 11, 1964 Saturday, September 12, 1964 Surge
26 Tide Plus Storm Surge Hurricane "Dora" Fernandina Dora: Beach Storm 9/11-12/1964 Tide First Storm Tide 7 ft 12:30 pm Second Storm Tide 6.8 ft 11:30 pm Tide drops to 3.8 ft at 5 pm :00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00 0:00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 Friday, September 11, 1964 Saturday, September 12, 1964 Storm Tide
27 Red Line = Light Blue + Blue Line Peak Storm Tide 7 hours before peak storm surge Storm Tide = Tide + Surge Hurricane "Dora" Fernandina Beach Total Tides 9/11-12/1964 Second Storm Tide 3 hours after peak storm surge :00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00 0:00:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 Friday, September 11, 1964 Saturday, September 12, 1964 Surge Astro Storm Tide
28 How We Build We Tend to Build to Our Normal Tidal ranges Brunswick, GA Sung Harbor, Toms River, NJ
29 How We Build Now Keaton Beach, FL Sung Harbor, Toms River, NJ
30 Some Tidal Ranges are Really Big Bay of Fundy, Canada Tidal Range 53 feet!
31 Question #3 The Daily/Diurnal Tidal Range at my local beach is? A. 1 to 2 feet B. 2 to 4 feet C. 4 to 6 feet D. 6 to 9 feet E. I haven t got a clue (but they serve Margaritas)!
32 Florida Tidal Range 0.9 ft September 10, ft 2.1 ft 4.3 ft 5.0 ft 3.0 ft Difference Between High and Low Tides 3.2 ft 2.1 ft 2.9 ft
33 Datums - This could be you! Your mayor ask you if the high school will flood if the storm surge hits at high tide? It s built in 1938 and historic with an elevation of +5 feet NGVD 1929 Your high tide that day is feet MLLW The surge is forecast to be +5 feet NAVD 1988 How much will the school flood Above Ground Level?
34 How High is 5 ft of Surge? At the Fort Myers - Caloosahatchee River 5 ft AGL is 5 ft AGL of surge 5 ft NAVD88 is 4 ft AGL of surge 5 ft NGVD29 is 2.84 ft AGL of surge 5 ft AGL 4 ft AGL 2.84 ft AGL Zero datum for Above Ground Level (I picked a random value) Zero datum newer SLOSH basins Zero datum for Mean Sea Level Zero datum for many tide gauges Zero datum in older SLOSH basins AGL NAVD88 MSL MLLW NGVD ft NAVD ft NAVD ft NAVD ft NAVD ft NAVD88
35 Know Your Reference Level Be Wary of the Datum (reference level) when using or comparing water level data NAVD88 NGVD29
36 Question #4 The Datum I use most often and am comfortable with is? A. Mean Lower Low Water (MLLW) B. Mean Sea Level (MSL) C. Mean Higher High Water (MHHW) D. National Geodetic Vertical Datum 1929 (NGVD) E. North American Vertical Datum of 1988 (NAVD) F. What is the datum of which you speak????
37 That is Why This Product Exists Potential Storm Surge Flooding Map Tool for evacuation decision making 9-in-10 times the surge will be lower than this
38 PSSF Map 2016 Hurricane Irma What does this map mean?
39 SW Florida Had 1-in-10 Chance of This 2008 Hurricane Ike, near Galveston, TX 2004 Hurricane Ivan, I-10, Pensacola, FL
40 Question #5 Topography vs Highest Surge? A. Convex B. Straight C. Concave D. Estuary
41 Some General Rules of Thumb Concave portions of a coast will USUALLY hold more storm surge/tide than convex portions of coast. All things being equal, a bay or estuary will experience higher storm surge/tide than a bulging coast or a point.
42 Concave and Convex Coast Biscayne Bay VS. South Beach Bathymetric Map 8 Feet 15 feet
43 A Tale of Two CAT 5s Concave Coast 33 feet Convex Coast 12 feet
44 More Rules of Thumb Larger storms affect longer stretches of coastline Direction of storm approach often impacts the extent of flooding Slope of the continental slope affects surge and waves Shallow slopes (West Florida) allow greater storm surge with small waves Steeper slopes (Miami area) have less surge but large breaking waves can occur
45 Size of Eye Wall Matters 12 mile wide eye wall 7 ft 2004 Hurricane Charley
46 What if Normal Size Eye? 50 mile wide eye wall 18 ft
47 Irma Storm Surge Simulations Feet Above MHHW Feet Above MHHW
48 More General Rules of Thumb Carter White Bay Shore Blvd in Tampa as 1985 Hurricane Elena stalled 100 miles to the northwest More intense storms cause higher surges Highest surges usually occur to the right of the storm track Fast moving storms = high surges along the open coast Slow moving storms = greater flooding inside bays and estuaries
49 2012 Tropical Storm Debby June 23-27, Peak wind 60 mph Debby made landfall at Steinhatchee, Florida with winds of 40 mph 9 Fatalities $309 million
50 Above Normal Tides 3.1 foot above normal at Clearwater Beach 4.07 foot above in Tampa Bay Tarpon Springs Joann Hoffman Clearwater Beach Rick Johnson Tampa Wen Dee
51 Above Normal Tides Around 4 foot above tide, Bay Shore Blvd in Tampa Road flooded for 2.5 days Tampa Dan Noah
52 Final Rules of Thumb Choke points MAY experience greater storm surge/tide than surrounding areas (e.g. rivers, canals, constricted channels) Inland bodies of water can experience a sloshing or sieche effect Lake Pontchartrain Lake Okeechobee St. Johns River
53 Jacksonville Choke Point 2017 Hurricane Irma flooding downtown was a combination of flooding from rain, surge, and tide Video Location
54 Monday, September 11, 2017 Tides around 4-5 feet above normal in Jacksonville Monday Morning
55 Question # 7 Inland bodies of water are immune from storm surge as they are not connected to the ocean! A. True B. False C. I m SOOOOOO confused!
56 Seiche Effect Cross Section of an Inland Water body
57 1949 Lake Okeechobee Hurricane
58 Around the Lake
59 1949 Lake Okeechobee Hurricane
60 1949 Lake Okeechobee Hurricane
61 Question # 8 Water flows fast so storm surge/tide is going to drop quickly at all points that it went to A.True B.False C.Really dude did you not see what happened in New Orleans!
62 Lake Pontchartrain 2012 Hurricane Isaac Flood Tide 5.5 days!
63 Note How Long It takes To Flush Water From Estuary! 4 Days 3 Days 2008 Hurricane Ike 2 Days
64 So How Did I Do? A. I really feel like I understand surge much better B. I feel like I understand surge a bit better C. Ok, I guess but I m still a somewhat confused D. Man, you kidding? You lost me on slide three E. Just wait until the evaluation dude! F. Man, I m still on Facebook! Leave me alone!
65 NWS Tropical Webpage What to Prepare For 1-in-10 chance Official Forecast 1-in-2 chance
66 Questions? NJ National Guard
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