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In this photo provided by the University of Hawaii, six carefully selected scientists entered this geodesic dome called Hawaii Space Exploration Analog and Simulation, or HI-SEAS located 8,200 feet above sea level on Mauna Loa on the island of Hawaii, Thursday, Jan. 19, 2017. The four men and two women moved into their new simulated space home Thursday afternoon, as part of a human-behavior study that could help NASA as it draws up plans for sending astronauts on long missions to Mars. (University of Hawaii via AP)

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In this photo provided by the University of Hawaii, scientists Joshua Ehrlich, from left, Laura Lark, Sam Payler, Brian Ramos, Jay Bevington and Ansley Barnard, pose for a photo before they enter a geodesic dome called Hawaii Space Exploration Analog and Simulation, or HI-SEAS located 8,200 feet above sea level on Mauna Loa on the island of Hawaii, Thursday, Jan. 19, 2017. The four men and two women moved into their new simulated space home Thursday afternoon, as part of a human-behavior study that could help NASA as it draws up plans for sending astronauts on long missions to Mars. (University of Hawaii via AP)

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Police and emergency services gather at the scene after a car is believed to have hit pedestrians in Bourke Street Mall in Melbourne, Australia, Friday, Jan. 20, 2017. Several pedestrians were injured after being struck by a car in Australia's second-largest city on Friday, prompting a major police operation as officials told the public to stay away from the area. (Luke Costin/AAP via AP)

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Virtually nothing remains of the home of Jessie and Diana Mills of Magee, Miss., following a direct hit by a possible morning tornado, Thursday, Jan. 19, 2017. Several homes and businesses were affected by the strong winds that affected several central Mississippi counties. (AP Photo/Rogelio V. Solis)

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A food processor is one of the few undamaged household appliances salvaged from the remains of the home of Jessie and Diana Mills of Magee, Miss., following a direct hit by a potential morning tornado, Thursday, Jan. 19, 2017. Several homes and businesses were affected by the series of strong winds that affected several central Mississippi counties. (AP Photo/Rogelio V. Solis)

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Lynn White, a friend of Jessie and Diana Mills of the Pine Grove community near Magee, Miss., reacts after seeing the complete destruction of their house following a direct hit by a possible tornado, Thursday, Jan. 19, 2017. Several homes and businesses were affected by the strong winds that passed through several central Mississippi counties. (AP Photo/Rogelio V. Solis)

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Bruce Boehs, a Pine Grove community neighbor, helps with the tree removal at one of the houses in the rural community near Magee, Miss., as cleanup begins following a hit by a possible tornado, Thursday, Jan. 19, 2017. Several homes and businesses were affected by the series of strong winds that blew through several central Mississippi counties. (AP Photo/Rogelio V. Solis)

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Traffic passes piles of tree debris in the Pine Grove community near Magee, Miss., following a hit by a possible morning tornado, Thursday, Jan. 19, 2017. Several homes and businesses were affected by the strong winds that blew though several central Mississippi counties. (AP Photo/Rogelio V. Solis)

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Piles of tree branches, roofing materials and household goods dot the Pine Grove community near Magee, Miss., following a direct hit by a possible morning tornado, Thursday, Jan. 19, 2017. Several homes and businesses were affected by a series of strong winds that affected several central Mississippi counties. (AP Photo/Rogelio V. Solis)

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Hardly anything remains of the home of Jessie and Diana Mills of the Pine Grove Community near Magee, Miss., following a direct hit by a possible morning tornado, Thursday, Jan. 19, 2017. Several homes and businesses were affected by the strong winds that blew through several central Mississippi counties. (AP Photo/Rogelio V. Solis)

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Only a few walls remain standing at the home of Jessie and Diana Mills of the Pine Grove Community near Magee, Miss., following a hit by a possible morning tornado, Thursday, Jan. 19, 2017. Several homes and businesses were affected by the strong winds that blew through several central Mississippi counties. (AP Photo/Rogelio V. Solis)

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A Pine Grove community home ended up with a uprooted tree smashing through the roof and walls as a result of the winds from a possible morning tornado, Thursday, Jan. 19, 2017. Several homes and businesses were affected by the strong winds that blew through several central Mississippi counties. (AP Photo/Rogelio V. Solis)

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A boxed board game sits atop the remains of the possessions of Jessie and Diana Mills of the Pine Grove Community near Magee, Miss., following a direct hit by a possible morning tornado, Thursday, Jan. 19, 2017. Several homes and businesses were affected by the strong winds that blew through several central Mississippi counties. (AP Photo/Rogelio V. Solis)

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A Victorian home is covered with a plastic tarp to protect it from the rain in the Echo Park neighborhood of Los Angeles Thursday, Jan. 19, 2017. California is getting soaked with series of heavy storms. A second storm will arrive Thursday night and could drop another 2 inches of rain and up to 3 inches in LA-area foothills by Saturday, forecasters said. Forecasters cautioned that mud and debris flows could occur if heavy rains fell on wildfire burn scars. (AP Photo/Damian Dovarganes)

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In a Jan. 13, 2017 photo, Cumberland Valley Tree Service is cutting down diseased ash trees at Scotland Campus at the entrance off Scotland Road, in Scotland, Pa. School officials say about 70 ash trees across campus must come down. The trees, which are hollowing out and dying, had served as a familiar entrance canopy for over 75 years. (Markell DeLoatch/Public Opinion via AP) /Public Opinion via AP)

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In a Jan. 13, 2017 photo, Cumberland Valley Tree Service is cutting down diseased ash trees at Scotland Campus at the entrance off Scotland Road, in Scotland, Pa. School officials say about 70 ash trees across campus must come down. The trees, which are hollowing out and dying, had served as a familiar entrance canopy for over 75 years. (Markell DeLoatch/Public Opinion via AP) /Public Opinion via AP)

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In a Friday, Jan. 13, 2017 photo, Dane Bricker carries branches to be cut at Scotland Campus, in Scotland, Pa. Cumberland Valley Tree Service is cutting down diseased ash trees at Scotland Campus at the entrance off Scotland Road. School officials say about 70 ash trees across campus must come down. The trees, which are hollowing out and dying, had served as a familiar entrance canopy for over 75 years. (Markell DeLoatch/Public Opinion via AP) /Public Opinion via AP)

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In this Jan. 13, 2017, photo, a tree lies on the ground as Cumberland Valley Tree Service cuts down diseased ash trees at Scotland Campus in Scotland, Pa. (Markell DeLoatch/Public Opinion via AP)

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Suzanne Louis prays by herself in the nearly empty emergency ward of Port-au-Prince's General Hospital, Haiti, Thursday Jan. 19, 2017. Nurses, janitors, stretcher bearers and other personnel have walked out of public hospitals in Haiti's chronically troubled health system to demand better pay and working conditions a few months after a lengthy strike by resident doctors ended. (AP Photo/David McFadden)

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A sick inmate with his feet shackled lies on a bed in the nearly empty emergency ward of Port-au-Prince's General Hospital, Haiti, Thursday Jan. 19, 2017. Nurses, janitors, stretcher bearers and other personnel have walked out of public hospitals in Haiti's chronically troubled health system to demand better pay and working conditions a few months after a lengthy strike by resident doctors ended. (AP Photo/David McFadden)