Hurricane Boris
A tropical wave came off the northwest coast of Africa on May 20. The wave did not significantly develop as it moved west across the Atlantic Ocean and Caribbean Sea. Once it crossed Central America into the eastern Pacific Ocean, cloudiness increased considerably with the system on May 31.[8] It became well-enough organized to be upgraded to Tropical Depression Two-E on June 2. After becoming a depression, the system moved to the west-northwestward. Upper-level easterly vertical wind shear limited the amount of the initial strengthening. However, an increase in convective banding led to its upgrade to Tropical Storm Boris on June 4, 500 miles (800 km) southwest of Manzanillo. An anticyclone aloft fostered additional development. By June 5, Boris became a hurricane. The hurricane began to move to the north-northwest in response to a trough off of the West Coast of the United States. Strengthening continued, and the storm reached its peak strength with winds of 90 miles per hour (140 km/h) and a minimum central pressure of 977 millibars (28.9 inHg). The winds in the eyewall of Boris ripped off the sails of the Azzure Dream sailboat. No other direct damages or casualties were reported from Boris.[8][9][10]The hurricane's cloud pattern became elongated along a southwest-northeast axis on June 6 due to an increased amount of vertical wind shear. Boris was downgraded to a tropical storm later in the day on June 6. The deep convection of the tropical storm decreased, as Boris moved over cooler waters. It was downgraded to a tropical depression on June 7 due to these factors. The depression dissipated as a tropical cyclone on June 8 as the system quickly lost its tropical characteristics. A small circulation remained in the cloud field offshore the northwest coast of Baja California for a few more days.[8][11] Boris' remnants brought rain to the Southwest. Despite causing the wettest June in San Diego since records began in 1850, not even an inch of rain fell at that location.[9][12]
Source: http://en.wikipedia.org/wiki/1990_Pacific_hurricane_season#Hurricane_Boris--
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