| 1991 Pacific typhoon season | |
|---|---|
 Season summary map | |
| Seasonal boundaries | |
| First system formed | March 5, 1991 |
| Last system dissipated | December 5, 1991 |
| Strongest storm | |
| Name | Yuri |
| • Maximum winds | 220 km/h (140 mph) (10-minute sustained) |
| • Lowest pressure | 895 hPa (mbar) |
| Seasonal statistics | |
| Total depressions | 38, 1 unofficial |
| Total storms | 29, 1 unofficial |
| Typhoons | 17 |
| Super typhoons | 5 (unofficial) |
| Total fatalities | ~5,574 total |
| Total damage | > $17.1 billion (1991 USD) |
| Related articles | |
The 1991 Pacific typhoon season was a slightly above-average season with 29 tropical storms, 17 typhoons and five super typhoons forming. It was quite a catastrophic season – Typhoon Yunya impacted the Philippines in mid June while in the same time experiencing a volcanic eruption, Typhoon Mireille severely impacting Japan, which became known for being the costliest typhoon on record until it was surpassed by Typhoon Doksuri in 2023, and Tropical Storm Thelma on November which became one of the deadliest storms to strike the Philippines, killing at least over 5,000 people.
It ran year-round in 1991, although most tropical cyclones tended to form in the northwestern Pacific Ocean between May and November 1991.[citation needed] These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean. However, the first named storm, Sharon, did not develop until. March 8. The last named storm, Zelda, dissipated on December 5.
The scope of this article is limited to the Pacific Ocean, north of the equator and west of the International Date Line. Storms that form east of the date line and north of the equator are called hurricanes; see 1991 Pacific hurricane season. Tropical Storms formed in the entire west pacific basin were assigned a name by the Joint Typhoon Warning Center. Tropical depressions in this basin have the "W" suffix added to their number. Tropical depressions that enter or form in the Philippine area of responsibility are assigned a name by the Philippine Atmospheric, Geophysical and Astronomical Services Administration or PAGASA. This can often result in the same storm having two names.