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'Atmospheric river' triggers evacuations in Southern California

It's called an "atmospheric river" -- basically ...

Posted: Mar 22, 2018 7:25 AM
Updated: Mar 22, 2018 7:25 AM

It's called an "atmospheric river" -- basically a river in the sky -- that could unleash catastrophic amounts of rain.

And the major storm is barreling right toward the fire-scarred regions of Southern California, with a potential to trigger flash flooding, mudslides and significant debris flow.

The season's strongest storm brings a risk of flash flooding and debris flows in recent burn areas

Evacuations are ordered in Los Angeles, Santa Barbara and Ventura counties

The heaviest rainfall is expected Wednesday afternoon through Thursday, and officials have already ordered mandatory evacuations in Santa Barbara, Ventura and Los Angeles counties. Up to 1.5 inches of rain have fallen in the burn scar areas since late Tuesday.

"That's a concern when you put in the heaviest rainfall anywhere in the United States and put it right over Southern California, directly over burn scars," CNN meteorologist Pedram Javaheri said.

"Some of the areas could see 6 inches of rainfall over 36 hours. That's six to eight months of rainfall in 36 hours, right over what would be a significant Thomas Fire burn scar region," he said.

The Thomas Fire, the largest fire in California's modern history, ignited in December and burned about 281,900 acres in Ventura and Santa Barbara counties.

Santa Barbara County officials have issued a mandatory evacuation order affecting about 30,000 people in extreme and high-risk debris flow areas ahead of the strongest storm of the season in that region. The mandatory evacuation there was effective from noon Tuesday for burn areas near the Thomas, Sherpa and Whittier fires.

The amount of rain and the intensity are enough to cause flooding even without the impact of the recent fires.

"We could experience localized flooding and road closures, which are not isolated to the burn areas. The threat of rock falls, mudslides and debris flow is high," said Rob Lewin, director of the Santa Barbara County Office of Emergency Management.

Mandatory and voluntary evacuations also took effect at noon Tuesday in Ventura County.

Los Angeles County officials ordered evacuations in areas affected by the recent Creek and La Tuna Canyon fires starting at 6 p.m. Wednesday, and warned other residents living in areas affected by recent fires to prepare for evacuations and street closures.

The large and powerful storm system across the eastern Pacific Ocean is expected to bring periods of moderate to heavy rain through late Thursday or early Friday.

Atmospheric rivers are long, narrow channels that transport water vapors outside the tropics. The one that's saturating California is known as the Pineapple Express, because it brings moisture from the tropical Pacific near Hawaii and can wallop the West Coast with rain and snow.

The National Weather Service predicts rainfall rates between a half to three-quarters of an inch per hour, with rain totals of 5 to 10 inches in the foothills and mountains. This total is significantly more than during the January 9 debris flow, when there were 3 to 6 inches of rainfall across the region.

Minnesota Coronavirus Cases

Data is updated nightly.

Cases: 312969

Reported Deaths: 3637
CountyCasesDeaths
Hennepin661641115
Ramsey27766505
Anoka22149228
Dakota22015190
Washington13999115
Stearns13733116
St. Louis8747112
Scott846255
Wright775843
Olmsted665634
Sherburne587641
Clay498457
Carver474213
Blue Earth414116
Rice412836
Kandiyohi408122
Crow Wing359634
Otter Tail314322
Chisago311611
Nobles308730
Benton299451
Winona276930
Mower261623
Douglas260337
Polk256324
Morrison231629
Lyon218711
Beltrami217117
McLeod212812
Becker205415
Goodhue203228
Steele19497
Isanti190617
Itasca190423
Carlton185816
Todd181214
Nicollet162525
Mille Lacs153631
Freeborn15336
Le Sueur147011
Cass143710
Brown141315
Waseca139211
Pine13658
Meeker12879
Roseau11964
Hubbard114925
Martin113320
Wabasha10561
Redwood94619
Chippewa8877
Cottonwood8664
Renville86527
Dodge8600
Watonwan8544
Wadena8016
Sibley7934
Rock7779
Aitkin76730
Pipestone72518
Fillmore6990
Houston6984
Yellow Medicine64812
Pennington6478
Kanabec61913
Murray5873
Swift5838
Faribault5612
Pope5391
Clearwater5248
Stevens5103
Marshall4979
Unassigned49359
Jackson4881
Lake4226
Koochiching3926
Wilkin3895
Lac qui Parle3773
Lincoln3591
Norman3497
Big Stone3182
Mahnomen2964
Grant2796
Kittson2248
Red Lake2133
Traverse1481
Lake of the Woods1001
Cook720

Iowa Coronavirus Cases

Data is updated nightly.

Cases: 227398

Reported Deaths: 2368
CountyCasesDeaths
Polk33642336
Linn14352165
Scott1124986
Black Hawk10893135
Woodbury10372126
Johnson955336
Dubuque923291
Story678822
Dallas637257
Pottawattamie631970
Sioux370325
Webster358535
Cerro Gordo357144
Marshall348546
Clinton331344
Buena Vista305414
Des Moines291520
Muscatine289268
Warren281914
Plymouth276042
Wapello255772
Jones232313
Jasper217944
Marion205320
Lee203917
Carroll198422
Bremer195212
Henry18307
Crawford174616
Benton170619
Tama154340
Jackson144613
Delaware144221
Washington141314
Dickinson139210
Boone137011
Mahaska126827
Wright12456
Clay11784
Buchanan117010
Hardin115810
Page11374
Hamilton11199
Clayton11175
Cedar108413
Harrison107729
Kossuth10667
Calhoun10617
Floyd105016
Mills10487
Fayette103910
Lyon10338
Butler10216
Poweshiek99313
Winneshiek97613
Iowa95812
Winnebago93023
Hancock8677
Grundy86311
Louisa86216
Sac8608
Chickasaw8574
Cherokee8484
Allamakee81811
Cass81623
Mitchell7984
Appanoose79312
Humboldt7715
Union7706
Shelby76511
Emmet76424
Guthrie75415
Franklin73921
Jefferson7142
Madison6864
Unassigned6690
Palo Alto6554
Keokuk5997
Howard5599
Pocahontas5584
Greene5250
Osceola5241
Ida48913
Clarke4874
Davis4709
Taylor4653
Montgomery46311
Monroe44412
Adair4418
Monona4352
Worth3630
Fremont3583
Van Buren3585
Lucas3256
Decatur3170
Wayne3007
Audubon2962
Ringgold2112
Adams1702
Rochester
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Mason City
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Feels Like: 12°
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Austin
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Charles City
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