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Why coastal communities should fear storm surge

The National Weather Service says almost half of all deaths from tropical cyclones come from storm surge....

Posted: Sep 12, 2018 1:29 PM
Updated: Sep 12, 2018 1:29 PM

The National Weather Service says almost half of all deaths from tropical cyclones come from storm surge.

While many people focus on the wind speed of storms, the danger often comes from the water flowing in from the ocean.

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Hurricane Florence

Privately, you may be wondering (and you wouldn't be alone): "What exactly is storm surge?"

"A storm surge is a rise in water level caused by a strong storm's wind pushing water on-shore," said CNN meteorologist Brandon Miller. "The wind literally piles up the ocean water and pushes it on the land."

Forecasters are worried about the surge from Hurricane Florence, which is expected to be a major storm when it pounds the Carolinas on Thursday and Friday.

The storm surge warning issued by the National Hurricane Center extends from the South Santee River in South Carolina to Duck, on North Carolina's barrier islands known as the Outer Banks.

Much of this part of the Eastern Seaboard is not very high at all and forecasters expect storm surge between the mouth of the Cape Fear River and Cape Lookout to be as high as 13 feet.

Geography, tide-cycle and wind direction are all factors in how severe storm surge could be, Miller said. The stronger the storm, the stronger the winds and the higher the storm surge will be.

Storm surge also can exacerbate flooding. As the water piles up along the coast, rivers and streams that typically drain into the ocean can become clogged farther upstream, forcing water levels to rise.

That water doesn't just leave. Depending on how much water was pushed ashore and the area's watershed, it may hang around, causing further damage to communities.

Due to climate change, storm surge has become an even greater threat in recent years.

"Sea levels have risen in most places by about 1 foot over the past century. The higher baseline ocean level allows storm surges to reach even higher, increasing their destructive capabilities," Miller said.

The National Weather Service in a 2014 report said that most surge deaths occurred in Hurricane Katrina and several other big, powerful storms. In a majority of storms, excessive rainfall that leads to drownings is the leading cause of death. Florence is expected to also be a rainmaker, with totals of 35 inches possible in some areas.

Minnesota Coronavirus Cases

Data is updated nightly.

Confirmed Cases: 142311

Reported Deaths: 2472
CountyConfirmedDeaths
Hennepin35484995
Ramsey14726372
Dakota10271139
Anoka9344155
Washington636273
Stearns625550
Scott360436
Olmsted340230
St. Louis325874
Wright273116
Clay252944
Nobles234318
Blue Earth21147
Carver18887
Sherburne183122
Kandiyohi18215
Rice170210
Mower154518
Winona133619
Chisago11562
Crow Wing114322
Benton103311
Lyon10306
Beltrami9618
Otter Tail9508
Waseca94510
Todd8967
Polk8364
Morrison8259
Steele8013
Itasca78817
Douglas7744
Nicollet77118
Freeborn7185
Le Sueur6646
Goodhue65111
Martin62618
Becker6214
McLeod6214
Isanti5995
Watonwan5824
Pine5770
Carlton5092
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Mille Lacs44918
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Cass4225
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Dodge4130
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Meeker3593
Rock3595
Brown3483
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Redwood29912
Yellow Medicine2986
Murray2973
Cottonwood2950
Fillmore2770
Renville27213
Sibley2663
Wadena2643
Faribault2520
Houston2381
Unassigned23853
Kanabec23710
Swift2252
Jackson2211
Pennington2181
Aitkin1982
Stevens1941
Lincoln1930
Koochiching1755
Pope1680
Big Stone1591
Marshall1511
Lac qui Parle1453
Wilkin1454
Clearwater1381
Norman1340
Lake1330
Mahnomen1292
Grant1054
Red Lake822
Traverse590
Kittson530
Lake of the Woods441
Cook190

Iowa Coronavirus Cases

Data is updated nightly.

Confirmed Cases: 122218

Reported Deaths: 1691
CountyConfirmedDeaths
Polk19732289
Woodbury743799
Linn6038133
Johnson602431
Black Hawk5974102
Dubuque550658
Scott487343
Story411118
Dallas357347
Pottawattamie337845
Sioux254417
Buena Vista230212
Marshall212236
Webster196015
Plymouth172831
Wapello158962
Clinton156228
Muscatine153958
Des Moines151611
Cerro Gordo150227
Crawford138714
Warren13137
Carroll120413
Jasper119734
Henry11245
Marion106811
Lee101312
Tama100538
Delaware82713
Dickinson7939
Wright7591
Boone7509
Mahaska73824
Bremer7199
Harrison69716
Washington69311
Jackson6853
Benton6482
Lyon5688
Clay5574
Louisa54415
Winnebago52119
Cedar5087
Winneshiek5079
Hardin5017
Jones5004
Kossuth4970
Clayton4923
Buchanan4875
Hamilton4825
Poweshiek47611
Floyd46211
Emmet45321
Iowa4429
Cass4233
Mills4233
Guthrie42015
Page4200
Cherokee4122
Sac4114
Butler4083
Fayette4064
Shelby4022
Allamakee3999
Franklin39518
Madison3743
Chickasaw3731
Hancock3676
Humboldt3593
Clarke3573
Grundy3406
Palo Alto3292
Calhoun3264
Osceola3020
Mitchell2961
Howard2879
Monroe27212
Union2645
Taylor2602
Jefferson2591
Appanoose2503
Monona2492
Pocahontas2442
Fremont2152
Lucas2136
Ida2122
Adair1971
Greene1930
Montgomery1907
Davis1884
Van Buren1882
Keokuk1731
Decatur1620
Audubon1601
Worth1470
Wayne1373
Ringgold992
Adams841
Unassigned60
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