Tropical Storm Octave (1983)

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Map key
Saffir–Simpson scale
  Tropical depression (≤38 mph, ≤62 km/h)
  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
Storm type
Disc Plain black.svg Tropical cyclone
Solid black.svg Subtropical cyclone
ArrowUp.svg Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

A tropical disturbance formed south of the Gulf of Tehuantepec on September 23. Steered by a deep layer high over Mexico, the disturbance moved west for four days before attaining tropical depression status. Upon becoming a tropical cyclone the depression was situated over warm waters; however, wind shear subsequently increased in the vicinity of the storm. Therefore, significant development was impeded as the depression curved back to the north along an adjacent upper-level low. [4]

As conditions aloft turned favorable by September 28, the depression strengthened into Tropical Storm Octave at 1800  UTC that day. Within six hours, Octave attained its peak intensity of 50 mph (80 km/h) and decreased in forward speed while turning to the northeast. On September 30, Octave began to accelerate towards the northeast as it began to weaken due to cooler waters and increasing vertical wind shear. Consequently, the winds gradually decreased to 35 mph (55 km/h) and the storm was downgraded back to tropical depression status during the afternoon. [5] At 1200 UTC on October 2, the EPHC issued their last advisory on the storm as the surface circulation had dissipated. [4]

Preparations

Due to the threat for flooding, local flood warnings were issued for much of Arizona. [6] Starting at 0100 UTC on September 30 and lasting until 0600 UTC on October 6, the Tucson National Weather Service office issued 20 warnings and statements including 13 radar-generated updates. In the same time period, the Phoenix National Weather Service office issued 28 warnings, watches, and statements, nine of which were flood warnings generated by the Joint Federal-State Flood Warning Office. Although several flood warnings from the Phoenix National Weather Service Office were requested to be broadcast via the Emergency Broadcast System (EBS), which is a national program that provides public warning for such disasters, no warnings were implemented. The reason was that time there was no formal EBS program active in the Tucson area, and there was only one program request to fill this gap, but that request was denied. The Pima County Emergency Services Director stated that "we just didn't see the need for activating the EBS system." Despite the lack of EBS broadcasts, NOAA Weather Radio claims it did the best it could to provide updated information on Octave. [2]

Impact

Tropical Storm Octave
Octave 1983-09-28 2045Z.png
Tropical Storm Octave at peak intensity on September 28
Costliest Pacific hurricanes
RankCycloneSeasonDamageRef
1 Otis 2023 $12–16 billion [7]
2 Manuel 2013 $4.2 billion [8]
3 Iniki 1992 $3.1 billion [9]
4 Odile 2014 $1.25 billion [10]
5 Agatha 2010 $1.1 billion [11]
6 John 2024 $1 billion [12]
7 Hilary 2023 $915 million [13]
8 Willa 2018 $825 million [14]
9 Madeline 1998 $750 million [15]
10 Rosa 1994 $700 million [16]

The rainfall event lasted for one week, from September 28 to October 4. [1] [17]

Arizona

Already inundated by previous rains, additional rainfall moved over the area; much of the state of Arizona was deluged with 6 in (150 mm) of precipitation in a mere two days. [18] Early on September 28, moisture related to Octave began to fall in northern Santa Cruz County, eastern Pima County, and in portions of Tucson. [2] In the end, the highest rainfall associated with the event was 12.0 in (300 mm) at Mount Graham. [17] Elsewhere, Nogales recorded 9.83 in (250 mm); portions of Tucson received over 8 in (200 mm), and Mount Lemmon experienced 10.45 in (265 mm). [1] [19] In addition to the rain, winds of 32 mph (51 km/h) were measured. [20]

In Tucson, flood waters reportedly reached 8 ft (2.4 m), stranding hundreds of people on rooftops. [21] Throughout the state, excessive rainfall caused many rivers to overflow. Water was released from the Coolidge Dam, which forced 75 residents to evacuate, [22] [23] marking the third time in 50 years that water was released from the dam. [24] After a third bout of heavy rain on October 2, the Santa Cruz, Rillito, and Gila rivers experienced their highest crests on record. [1] A flow rate of 25,000 cu ft (707,921,165 cc) per second was measured in the Rillito river; [18] the Santa Cruz river peaked at a flow rate of 1,490 m3 (52,620 cu ft), [2] which was short of the record set during Hurricane Heather during the 1977 Pacific hurricane season. [25] All other rivers that pass through Tucson did not attain record levels and were significantly lower than past flood episodes. [2]

Rainfall totals in Mexico and the southwest United States Octave1983filledrainblk.gif
Rainfall totals in Mexico and the southwest United States

As Tropical Storm Octave deluged the state, the Rillito River slowly eroded its banks, and by October 2, the river had widened 100 ft (30 m), destroying a parking lot and an office building. Runoff from both the Rillito and Santa Cruz rivers eventually piled up in a delta, flooding Marana. [2] In Marana, many homes were submerged, forcing residents to be evacuated. Only two town residents had flood insurance because officials "didn't believe a flood could occur there." Additionally, communities along the Santa Cruz River were flooded, forcing 4,000 residents to evacuate their homes, many of whom lost key property possessions. The metropolitan area of Tucson was completely flooded due to the storm. [18]

Tropical Storm Octave also caused major flooding along the Gila River, [2] which reached its highest discharge rates since 1906. [25] and two of its tributaries, the San Francisco River and the San Pedro River. These rains devastated Clifton along the San Francisco River valley. [2] Most of Clifton's 4,200 residents had to be evacuated due to flooding, where over 700 homes were destroyed. In addition, 86 of the town's 126 businesses were heavily damaged due to the floods. [18] The Gila River near Clifton sustained its largest discharge rates since Clifton was founded. [2] Along the Southern Francisco River, a peak discharge rate of 56,000 cu ft (1.6×109 cc) was reported by meteorologists, which is 1.8 times greater than the previous record set by Hurricane Joanne during the 1972 Pacific hurricane season. [25]

Further south along the Gila River, major flooding was reported in extreme southeastern Arizona, where Octave was described as the worst flood in the area's history since 1916. [25] In Willcox, a farming community 80 mi (130 km) east of Tucson, residents armed with shovels and sandbags fought rising floodwaters after the Hooker Dam, an earthen dam 35 mi (55 km) north of Willcox, burst, preventing further destruction. The cities of Nogales and Tubac, near the Mexican border, was without power and water for two days following the storm. [24]

The Mohave and Yavapai counties were particularly hard-hit. A relief helicopter crashed in attempt to rescue a woman and her baby, killing its two crew members. [26] Five towns – Clifton, Duncan, Winkelman, Hayden, and Marana – were all almost entirely flooded. [1] Authorities were forced to close Interstate 10 when waters from the Gila River destroyed a bridge. [27] Additionally, two people perished in their car on an Indian reservation in the Gila River valley. [28] Nearby, in Phoenix, 150 persons were evacuated from an apartment complex. [29] One underpass was filled with water 9 ft (2.7 m) deep. Throughout the greater Phoenix area, eight fires were started via lightning. Damage from the fires totaled $90,000. In all, 14 injuries were reported. [30] The 28 mile (45 km) long Santa Fe Railway that served the city of Prescott was washed out in multiple locations between the Chino Valley and downtown Prescott due to floodwaters. Railroad service was never reinstituted and the line was formally abandoned in 1984, leaving Prescott as Arizona's largest city ever to lose its rail service. [31]

Extensive damage was reported throughout the state. About one-seventh of the cotton crop was destroyed by Octave. Much of the rich topsoil was washed downstream into large reservoirs. Furthermore, agriculture damage totaled about $97.5 million. Damage to homes totaled $17 million while damages to business exceeded $6 million in damage. Public property damage reached $55.7 million. A father, mother, and two children were swept off their truck in Ash Fork. Two navy officers where killed on September 30 near Oatman when their jet crashed. On October 1, a man drowned in the Santa Cruz river. Another person drowned in a wash near Tucson when his truck stalled. In addition, a taxi driver and a passenger died when tried to cross a flooded river. [30]

Overall, infrastructural damage estimates in the Tucson area ranged from $54–100 million; [2] damage to roads and highways alone surpassed $10 million in Tucson. [26] Tropical Storm Octave was very similar to Tropical Storm Norma in terms of flood damage. Octave was also described as the "Storm of the Century" and a 100-year flood. [2] The system is considered the cause of the worst flood in Pima County history. [32] It is also regarded as the worst tropical system to affect Arizona. [33]

Around 3,000 buildings were destroyed due to Octave. [29] A total of 853 houses, mobile homes, and apartments were destroyed by Octave while 2,052 others were damaged. [24] About 10,000 people were temporarily left homeless. [19] Damage in Arizona totaled $500 million, [1] which was above the preliminary estimate of $300 million. [29] Fourteen people drowned and 975 persons were injured. [34]

Elsewhere

Octave south of Baja California. Tropical storm octave (1983).JPG
Octave south of Baja California.

In New Mexico, a peak total of 5.31 in (135 mm) of rain was recorded. [35] In that state, the rainfall also caused flooding that forced people from their homes and damaged a portion of U.S. Route 180; New Mexico governor Toney Anaya declared a state of emergency in Catron County. [36] Damage to four flooded counties in southwest New Mexico was estimated at $12.5 million, including $6.5 million worth of damage to levees and dikes. Damage to highways also totaled $1.5 million. [37]

Further west, rainfall was also reported in California. In Mexico, 12 in (300 mm) of precipitation was reported in Altar, while lighter totals between 1–3 in (25–75 mm) were reported along the Baja California Peninsula. [17] In Sonora, many roads near the border were closed, and a lack of food supply was reported. [38] Along the Mexican Riviera, there were isolated reports of 1 in (25 mm) of precipitation. [17]

Aftermath

On October 3, Governor Bruce Babbitt declared a state of emergency. Concerns arose regarding the state of several areas and possible disruptions in the delivery of food and other supplies. [39] President Ronald Reagan declared Arizona counties Cochise, Gila, Graham, Greenlee, Pima, Pinal, Santa Cruz and Yavapai a "major disaster area" on October 5. [40] About $650,000 worth of government aid was provided to victims of Octave. Babbitt also toured the devastated area. Officials also opened 15 shelters, which housed 2,905 people. [24]

Many workers from dozens of companies used cranes, dynamite, trucks, and hammers to clean up dried 7 ft (2.1 m) mud near some rivers. [38] Many destroyed buildings were later rebuilt. Considerable experience was also gained on how to protect flood banks. [18] Repair costs from Octave totaled $60 million. [41] It is estimated that it took four months for floodwaters to recede across southeastern Arizona and portions of New Mexico. [25]

See also

Notes

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    16. ↑ "Floods in Southeast Texas, October 1994" (PDF). United States Geological Survey. January 1995. p. 1. Archived (PDF) from the original on March 3, 2016. Retrieved October 1, 2008.
    17. 1 2 3 4 Roth, David. "Remains of Octave". Hydrometeorological Prediction Center . Retrieved July 1, 2013.
    18. 1 2 3 4 5 "The "Floods" of October 1983" (PDF). Arionza Bureau of Geology and Mineral Technology. 14 (2). Flednotes. 1984. Archived from the original (PDF) on September 20, 2013. Retrieved July 1, 2013.
    19. 1 2 Tropical cyclones in Arizona (Report). United States National Weather Service Weather Forecast Office Tucson, Arizona. Archived from the original on September 1, 2008. Retrieved December 31, 2022.
    20. ↑ "Threat of Nora a reminder". Arizona Daily Star . September 25, 1997.
    21. ↑ "Arizona flooding strands hundreds". Bangor Daily News. October 3, 1983. Retrieved November 27, 2010.
    22. ↑ "Continued Rain Deepens Arizona Flood Misery". The Lewiston Daily Sun. October 4, 1983. Retrieved November 27, 2010.
    23. ↑ "Flood cleanup in Arizona to get underway". Lodi News-Centinel. October 7, 1983. Retrieved 27 November 2010.
    24. 1 2 3 4 "Domestic News". Associated Press. October 4, 1983. – via Lexis Nexis (subscription required)
    25. 1 2 3 4 5 Roeske, R. H (Fall 1989). Floods of October 1983 in southeastern Arizona (Report). Hathiust. Retrieved July 1, 2013.
    26. 1 2 "Thousands Flee Flooding in Arizona". The Palm Beach Post. October 3, 1983. Retrieved 23 November 2010.
    27. ↑ "Arizona Flooding Aftermath". Gainesville Sun. October 5, 1983. Retrieved 23 November 2010.
    28. ↑ David Smothers (October 5, 1983). "Domestic News". United Press International. – via Lexis Nexis (subscription required)
    29. 1 2 3 Arthur H. (October 5, 1983). "Domestic News". Associated Press. – via Lexis Nexis (subscription required)
    30. 1 2 "Storm Data - September 1983" (PDF). National Oceanic and Atmospheric Administration . Retrieved July 2, 2013.
    31. ↑ Schwieterman, Joseph P. (2004). When the Railroad Leaves Town: American Communities in the Age of Rail Line Abandonment, Western United States. Kirksville, Missouri: Truman State University Press. p. 10. ISBN   978-1-931112-13-0.
    32. ↑ "Mary heading for state". Arizona Daily Star. September 23, 2003. – via Lexis Nexis (subscription required)
    33. ↑ "Hurricane's local impact". Arizona Daily Star. August 28, 2003. – via Lexis Nexis (subscription required)
    34. ↑ "…Top Arizona Hurricane/Tropical Storm Events…". United States National Weather Service Weather Forecast Office Phoenix, Arizona. Archived from the original on September 29, 2009. Retrieved January 2, 2023.
    35. ↑ Roth, David M (May 12, 2022). "Tropical Cyclone Rainfall for the Western United States". Tropical Cyclone Rainfall. United States Weather Prediction Center. Retrieved January 6, 2023.PD-icon.svg This article incorporates text from this source, which is in the public domain.
    36. ↑ Arthur E. Rotstein (1983-10-04). "Arizona Flood Damage Climbs". The Spokesman-Review. Associated Press. Retrieved December 12, 2014.
    37. ↑ Brenda W. Rotzull (October 7, 1983). "Domestic News". United Press International. – via Lexis Nexis (subscription required)
    38. 1 2 Arthur H. Rostien (October 6, 1983). "Domestic News". Association Press. – via Lexis Nexis (subscription required)
    39. ↑ "Eight feared dead in Arizona floods". Lodi News-Sentinel. October 3, 1983. Retrieved 27 November 2010.
    40. ↑ "Officials assess Arizona flood damage". Pittsburgh Post-Gazette. October 10, 1983. Retrieved 27 November 2010.
    41. ↑ Edward B. Havans (October 8, 1983). "Flood-ravaged Arizona gets a dry weekend". United Press International. – via Lexis Nexis (subscription required)
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