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The National Weather Service said the showers developed around midnight and moved in the north northwest direction.
Lightning could be seen from Hayward, and Berkeley, surprising many residents.
12:30 AM radar: Isolated thunderstorm in eastern #AlamedaCounty. Lightning seen from #Hayward. Storm moving towards Berkeley. #cawx pic.twitter.com/FwE3AlCQDb
— NWS Bay Area (@NWSBayArea) June 19, 2017
I had to hop on twitter to make sure I wasn't trippin when I heard that thunder lmaoo
— Kat (@_katyymariee) June 19, 2017
Lightning and thunder but it's 100 degrees what in the world
— Riki (Kim) (@rikimgr) June 19, 2017
The storm then moved onto the Marin County area.
1:20 AM Monday Radar update: Isolated thunderstorm now approaching #MarinCounty including #SanRafael and #Novato. #cawx pic.twitter.com/WB0jApGq2h
— NWS Bay Area (@NWSBayArea) June 19, 2017
The National Weather Service said the showers would end by daybreak Monday.
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