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Weather Blog: Fujiwhara Effect

Tropical Storm Laura and Tropical Storm Marco's proximity to each other could cause what is known as the Fujiwhara Effect.

Posted: Aug 21, 2020 10:08 PM
Updated: Aug 22, 2020 12:28 PM

FORT WAYNE, Ind. (WFFT) — It has been a record-setting 2020 Atlantic hurricane season and it looks like that trend will continue.

The National Hurricane Center is keeping close tabs on two systems with one being Tropical Storm Laura and the other one is Tropical Storm Marco.

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The kicker here is that both tropical systems are aiming for the Gulf Coast at the same time.

The last time this sort of situation occurred was on September 5, 1993 when Hurricane Cuba-Brownsville (Category 3) moved into Texas while Tropical Storm Treasure Coast made landfall near Cedar Key.

Tropical Storm Laura and Tropical Storm Marco's proximity to each other could cause what is known as the Fujiwhara Effect.

The Fujiwhara effect is an unusual weather phenomenon where two systems spin in the same direction and pass in close proximity.

When this occurs, the two systems begin to basically dance around a common center.

  • If the two systems are equal in strength they can gravitate closer to each other. Once this happens, they could basically dance around each other.
  • If one system is stronger than the other one, it will absorb the weaker one. It will NOT become a mega-storm.
  • Both systems don’t feel like sharing the same space or energy and they will stay away from each other or go in opposite directions.

The Fujiwhara effect is not a new term by any means.

The last time this happened was in 2005 when Hurricane Wilma absorbed a much smaller and weaker tropical storm named Alpha.

The forecast for Tropical Storm Laura and Tropical Storm Marco are not set in stone and the tracking will likely change.

Indiana Coronavirus Cases

Data is updated nightly.

Cases: 608519

Reported Deaths: 9693
CountyCasesDeaths
Marion840461335
Lake45349684
Allen32803548
Hamilton29394315
St. Joseph27380381
Elkhart24404345
Vanderburgh19411249
Tippecanoe17970138
Johnson15069295
Porter14783169
Hendricks14401248
Madison10965221
Vigo10726181
Clark10677144
Monroe9383110
Delaware9116134
LaPorte9065163
Howard8236144
Kosciusko806983
Warrick672999
Hancock6697104
Bartholomew6484100
Floyd6428110
Wayne6136162
Grant5991115
Dubois555579
Boone551168
Morgan541295
Henry507864
Marshall503984
Cass483263
Dearborn479845
Noble473059
Jackson425047
Shelby417581
Lawrence391079
Clinton373043
Gibson370359
Harrison348144
DeKalb347164
Montgomery345754
Knox335639
Miami321444
Steuben313745
Whitley307326
Wabash303251
Adams300936
Ripley298445
Putnam296850
Huntington291659
Jasper289034
White273243
Daviess270474
Jefferson263338
Decatur247683
Fayette247148
Greene239862
Posey239328
Wells236051
LaGrange228862
Scott225339
Clay222532
Randolph213548
Jennings198936
Sullivan192333
Spencer191321
Washington186423
Fountain184027
Starke175443
Jay167623
Owen165737
Fulton164030
Orange159534
Carroll158015
Rush155118
Perry154229
Vermillion149134
Franklin148333
Tipton132332
Parke13078
Pike116926
Blackford111022
Pulaski97037
Newton90921
Brown88035
Benton86610
Crawford7999
Martin73713
Warren6817
Switzerland6615
Union6287
Ohio4907
Unassigned0376

Ohio Coronavirus Cases

Data is updated nightly.

Cases: 859841

Reported Deaths: 10680
CountyCasesDeaths
Franklin101171707
Cuyahoga855711125
Hamilton64017448
Montgomery43107418
Summit34836761
Lucas31350625
Butler30973232
Stark25786435
Warren19671140
Lorain19017223
Mahoning17321338
Lake16080154
Clermont15926111
Delaware1438878
Licking13204137
Trumbull12809316
Fairfield1279381
Greene12055137
Medina11591168
Clark10942265
Wood10348158
Allen9897126
Portage9296109
Miami916873
Richland9139118
Marion7459113
Tuscarawas7381182
Columbiana7327124
Pickaway726150
Wayne7034171
Muskingum703141
Erie6152129
Hancock552390
Ross548998
Scioto539164
Geauga508455
Darke470292
Ashtabula453073
Lawrence452654
Union451828
Sandusky436662
Mercer433589
Seneca430166
Huron428741
Auglaize422264
Shelby421222
Jefferson419269
Belmont416840
Washington388740
Athens38009
Putnam374975
Madison355129
Knox352622
Ashland344938
Fulton338443
Defiance330086
Crawford322374
Preble320637
Brown312921
Logan307332
Ottawa293943
Clinton290143
Williams278667
Highland275118
Jackson263845
Guernsey254125
Champaign252028
Fayette236530
Morrow23234
Perry231318
Holmes225474
Henry218749
Hardin213033
Coshocton205622
Van Wert202245
Gallia196726
Wyandot196051
Pike176217
Adams176115
Hocking172024
Carroll155616
Paulding144321
Noble120540
Meigs108624
Monroe100732
Harrison89121
Morgan83130
Vinton70213
Unassigned00
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Feels Like: 30°
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Lima
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