Hurricane Joanne (1972)
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 Hurricane Joanne on October 2 | |
| Meteorological history | |
|---|---|
| Formed | September 30, 1972 |
| Dissipated | October 7, 1972 |
| Category 2 hurricane | |
| 1-minute sustained (SSHWS/NWS) | |
| Highest winds | 100 mph (155 km/h) |
| Lowest pressure | 971 mbar (hPa); 28.67 inHg |
| Overall effects | |
| Fatalities | 1 direct, 9 indirect |
| Damage | $10 million (1972 USD) |
| Areas affected | Baja California, California, Arizona, New Mexico |
| IBTrACS | |
Part of the 1972 Pacific hurricane season | |
Hurricane Joanne was one of four tropical cyclones to bring gale-force winds to the Southwestern United States in the 20th century. A tropical depression developed on September 30, 1972. It then moved west northwest and intensified into a hurricane on October 1. Hurricane Joanne peaked as a Category 2 hurricane, as measured by the modern Saffir-Simpson hurricane wind scale (SSHWS), October 2. Joanne then slowed and began to re-curve. Joanne made landfall along the northern portion of the Baja California Peninsula as a tropical storm. The tropical storm moved inland over Sonora on October 6 and was believed to have survived into Arizona as a tropical storm. In Arizona, many roads were closed and some water rescues had to be performed due to a prolonged period of heavy rains. One person was reportedly killed while another was electrocuted. A few weeks after the hurricane, Arizona would sustain additional flooding and eight additional deaths.
Tropical storm (39–73 mph, 63–118 km/h)
Category 1 (74–95 mph, 119–153 km/h)
Category 2 (96–110 mph, 154–177 km/h)
Category 3 (111–129 mph, 178–208 km/h)
Category 4 (130–156 mph, 209–251 km/h)
Category 5 (≥157 mph, ≥252 km/h)
Unknown
Extratropical cyclone, remnant low, tropical disturbance, or monsoon depressionOn September 26, ship reports and satellite imagery indicated an area of squally weather about 300 mi (485 km) south of Guatemala. During September 27 and September 28, the disturbance moved westward. On September 29, the disturbance developed a closed low-level atmospheric circulation.[1] The following day, the system was designated as a tropical storm[2] after a ship reported winds of 45 mph (70 km/h). A Hurricane Hunter aircraft investigated the growing storm on October 1 and estimated maximum sustained winds of 75 mph (120 km/h), making Joanne a Category 1 hurricane. However, very few ships reported winds greater than 30 mph (50 km/h) at that time.[1] On October 2, the EPHC classified Joanne as a Category 2 system on the Saffir-Simpson Scale. Furthermore, Joanne was estimated to have attained its peak intensity of 100 mph (160 km/h).[2]
On October 4, Joanne began to recurve, and developed winds of 90 mph (145 km/h). Later that day, the Eastern Pacific Hurricane Center (EPHC) downgraded Joanne into a tropical storm as the system weakened.[1] Accelerating north and later northeast, Joanne made landfall near Laguna Chapala on Baja California while a tropical storm late on October 5 and moved inland over Sonora on the next day. At the time of its second landfall, the EPHC suddenly stopped tracking the storm altogether,[2] although the Weather Prediction Center believes that Joanne moved northeast into western Pima County while still a minimal tropical storm. Thereafter, Joanne was estimated to have weakened to a depression near Ajo and dissipated near Flagstaff.[3]
