A tropical wave moved offshore western Africa on August 18, and moved west for ten days across the Atlantic Basin with no development.
After entering the northeast Pacific on August 31, thunderstorm activity with the wave increased. On September 1, a broad low pressure
system formed a couple hundred miles southwest of Manzanillo. Vertical wind shear from the northeast slowed development. The system
became well enough organized to be considered a tropical depression on September 2, and as vertical wind shear decreased, a hurricane
by late on September 3. Norbert became a major hurricane just offshore Cabo San Lucas late on September 5, becoming the strongest storm
in the area west of Cabo San Lucas since the 1984 and 2008 incarnations of Norbert. Soon afterward, the storm moved over colder waters,
with Norbert becoming a remnant low late on September 7. The remnant low dissipated west of Point Eugenia late on September 10.
The graphics below show the storm total rainfall for Norbert, which used information from the National Weather
Service River Forecast Centers, Forecast Offices, and CoCoRAHS.
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