Associate Administrator for NASA's Science Mission Directorate and former astronaut John M. Grunsfeld talked to the attendees of the The American Geophysical Union (AGU) meet at the Moscone Center in San Francisco, California. New results presented at the meeting show atmospheric rivers, significant sources of rainfall, tend to intensify during Nino events, and this years strong El Nino likely will bring more precipitation to California and some relief for the drought.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California. Friedemann Freund at poster session.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California. NASA Ames Hyperwall exhibit booth demonstration.

2009 American Geophysical Union (AGU) conference in San Francisco, California. Dr David Morrison, Director Lunar Science Institute and Senior Scientist, NASA Astrobiology.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California. NASA Ames Hyperwall exhibit booth demonstration.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California. NASA Ames Hyperwall exhibit booth demonstration.

American Geophysical Union 'AGU' Fall Meeting in San Francisco Moscone Center, California. NASA Ames Hyperwall exhibit booth demonstration.

NASA booths are seen at the American Geophysical Union (AGU) annual meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington, DC. Photo Credit: (NASA/Aubrey Gemignani)

NASA booths are seen at the American Geophysical Union (AGU) annual meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington, DC. Photo Credit: (NASA/Aubrey Gemignani)

NASA booths are seen at the American Geophysical Union (AGU) annual meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington, DC. Photo Credit: (NASA/Aubrey Gemignani)

NASA booths are seen at the American Geophysical Union (AGU) annual meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington, DC. Photo Credit: (NASA/Aubrey Gemignani)

NASA booths are seen at the American Geophysical Union (AGU) annual meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington, DC. Photo Credit: (NASA/Aubrey Gemignani)

NASA booths are seen at the American Geophysical Union (AGU) annual meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington, DC. Photo Credit: (NASA/Aubrey Gemignani)

NASA booths are seen at the American Geophysical Union (AGU) annual meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington, DC. Photo Credit: (NASA/Aubrey Gemignani)

NASA booths are seen at the American Geophysical Union (AGU) annual meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington, DC. Photo Credit: (NASA/Aubrey Gemignani)

NASA booths are seen at the American Geophysical Union (AGU) annual meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington, DC. Photo Credit: (NASA/Aubrey Gemignani)

NASA booths are seen at the American Geophysical Union (AGU) annual meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington, DC. Photo Credit: (NASA/Aubrey Gemignani)

NASA booths are seen at the American Geophysical Union (AGU) annual meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington, DC. Photo Credit: (NASA/Aubrey Gemignani)

Talks were given at the NASA Hyperwall, Tuesday, December 11, 2018 at the Washington Convention Center in Washington as part of the American Geophysical Union (AGU) annual meeting. Photo Credit: (NASA/Aubrey Gemignani)

NASA booths are seen at the American Geophysical Union (AGU) annual meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington, DC. Photo Credit: (NASA/Aubrey Gemignani)

Christine McEntee, American Geophysical Union (AGU) Executive Director and Chief Executive Officer, introduces NASA Administrator Jim Bridenstine at the annual AGU meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington. Photo Credit: (NASA/Aubrey Gemignani)

Talks were given at the NASA Hyperwall, Tuesday, December 11, 2018 at the Washington Convention Center in Washington as part of the American Geophysical Union (AGU) annual meeting. Photo Credit: (NASA/Aubrey Gemignani)

Christine McEntee, American Geophysical Union (AGU) Executive Director and Chief Executive Officer, second from left; NASA Administrator Jim Bridenstine, third from left; Thomas Zurbuchen, associate administrator, Science Mission Directorate, NASA, fourth from left; and Dennis Andrucyk, deputy associate administrator, Science Mission Directorate, NASA, right, pose for a photo with winners of the AGU Data Visualization Storytelling Competition at the annual AGU meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine visits a NASA booth at the American Geophysical Union (AGU) meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine visits a NASA booth at the American Geophysical Union (AGU) meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine speaks at the American Geophysical Union (AGU) meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington. Photo Credit: (NASA/Aubrey Gemignani)

Casey Youngflesh speaks during the press briefing, "Penguins from Space", Tuesday, December 11, 2018 at the Marriott Marquis in Washington as part of the American Geophysical Union (AGU) annual meeting. Photo Credit: (NASA/Aubrey Gemignani)

Michael Polito speaks during the press briefing, "Penguins from Space", Tuesday, December 11, 2018 at the Marriott Marquis in Washington as part of the American Geophysical Union (AGU) annual meeting. Photo Credit: (NASA/Aubrey Gemignani)

Heather Lynch speaks during the press briefing, "Penguins from Space", Tuesday, December 11, 2018 at the Marriott Marquis in Washington as part of the American Geophysical Union (AGU) annual meeting. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine visits a NASA booth at the American Geophysical Union (AGU) meeting, Tuesday, Dec. 11, 2018 at the Washington Convention Center in Washington. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine speaks at the Earth Science Town Hall at the American Geophysical Union (AGU) annual meeting, Tuesday, December 11, 2018 at the Marriott Marquis in Washington. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine speaks at the Earth Science Town Hall at the American Geophysical Union (AGU) annual meeting, Tuesday, December 11, 2018 at the Marriott Marquis in Washington. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine speaks at the Earth Science Town Hall at the American Geophysical Union (AGU) annual meeting, Tuesday, December 11, 2018 at the Marriott Marquis in Washington. Photo Credit: (NASA/Aubrey Gemignani)

Ron Kwok speaks during the press briefing, "First Results from New ICESat-2 Mission, Tuesday, December 11, 2018 at the Marriott Marquis in Washington as part of the American Geophysical Union (AGU) annual meeting. Photo Credit: (NASA/Aubrey Gemignani)

Dr. Michael Freilich, Earth Science Director, Science Mission Directorate, NASA, speaks at the Earth Science Town Hall at the American Geophysical Union (AGU) annual meeting, Tuesday, December 11, 2018 at the Marriott Marquis in Washington. Photo Credit: (NASA/Aubrey Gemignani)

Ben Smith speaks during the press briefing, "First Results from New ICESat-2 Mission, Tuesday, December 11, 2018 at the Marriott Marquis in Washington as part of the American Geophysical Union (AGU) annual meeting. Photo Credit: (NASA/Aubrey Gemignani)

Tom Neumann speaks during the press briefing, "First Results from New ICESat-2 Mission, Tuesday, December 11, 2018 at the Marriott Marquis in Washington as part of the American Geophysical Union (AGU) annual meeting. Photo Credit: (NASA/Aubrey Gemignani)

Ron Kwok speaks during the press briefing, "First Results from New ICESat-2 Mission, Tuesday, December 11, 2018 at the Marriott Marquis in Washington as part of the American Geophysical Union (AGU) annual meeting. Photo Credit: (NASA/Aubrey Gemignani)

Dr. Michael Freilich, Earth Science Director, Science Mission Directorate, NASA, speaks at the Earth Science Town Hall at the American Geophysical Union (AGU) annual meeting, Tuesday, December 11, 2018 at the Marriott Marquis in Washington. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine, right, and Dr. Michael Freilich, Earth Science Director, Science Mission Directorate, NASA, pose for a photo after Dr. Freilich was awarded the NASA Distinguished Service Medal at the Earth Science Town Hall at the American Geophysical Union (AGU) annual meeting, Tuesday, December 11, 2018 at the Marriott Marquis in Washington. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine awards Dr. Michael Freilich, Earth Science Director, Science Mission Directorate, NASA, the NASA Distinguished Service Medal at the Earth Science Town Hall at the American Geophysical Union (AGU) annual meeting, Tuesday, December 11, 2018 at the Marriott Marquis in Washington. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine, right, poses for a photo with Michael Freilich, earth science director, Science Mission Directorate, Tuesday, Dec. 11, 2018 at the Marriott Marquis hotel after presenting him with a NASA Lifetime Achievement award. Photo Credit: (NASA/Aubrey Gemignani)

Jason Jones, left, and Lauren Childs are pictured with their presentation during the poster session at the American Geophysical Union Fall Meeting in San Francisco, Calif., Dec. 10-14, 2007.