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Tropical Storm Ignacio (1997)
Tropical Storm Ignacio was a weak tropical cyclone affected parts of the western United States in August 1997. The 12th tropical cyclone and 9th named storm of the 1997 Pacific hurricane season, Ignacio formed west of Mexico from a weather disturbance embedded within a more broad system. It was classified as a tropical depression on August 17, and although it quickly intensified into a tropical storm, harsher environmental conditions caused it to begin weakening as the cyclone moved northward. On August 19, Ignacio transitioned into an extratropical cyclone as it approached California, where its remnants produced unprecedented August rainfall, numerous traffic accidents, and 78,000 power outages.
==Meteorological history==
Tropical Storm Ignacio originated in a broad region of active weather that persisted west of Mexico during the middle of August 1997. Among multiple other disturbances, the precursor to Ignacio developed on August 16, well to the southwest of the Baja California Peninsula. Later that day, banding features formed and convection began turning counterclockwise around a nascent area of low pressure in the middle levels of the atmosphere. It continued to become better organized, and at 0000 UTC on August 17, the National Hurricane Center classified it a tropical depression. At the time, the storm was situated approximately southwest of Cabo San Lucas, outside of the area in which tropical cyclones usually form in the Eastern Pacific ocean basin.
The depression moved northwestward at under the steering currents of mid- to upper-level trough of low pressure off the coast of California. A burst of deep convection formed near the cyclone's center early on August 17, and its estimated maximum sustained winds subsequently increased to . As such, it was upgraded to Tropical Storm Ignacio at 1200 UTC. At the same time, the storm reached its lowest recorded barometric pressure of 1005 millibars. However, due to increasingly colder waters and the presence of inhibiting southwesterly wind shear, it immediately stopped intensifying. Ignacio maintained tropical storm status for a short time, and early on August 18, it weakened back into a depression.〔
During its weakening stage, deep convection existed only in the northwestern quadrant of the circulation. On August 19, cold cloud tops reappeared, although this brief revival has been attributed to non-tropical baroclinic instability. At 1200 UTC, the depression was declared extratropical, and it continued northward until dissipating near California a day later. Moisture from the system persisted as it passed through the state and the Pacific Northwest, ultimately merging with a larger extratropical cyclone involving the remnants of Hurricane Guillermo.〔
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