Hurricane Ismael (1983)

Hurricane Ismael was responsible for significant flooding throughout the Inland Empire of the United States in August 1983. The cyclone was the tenth depression, ninth named storm, and fifth hurricane of the 1983 Pacific hurricane season. The origins of Hurricane Ismael were from a northward bulge of the Intertropical Convergence Zone (ITCZ) in early August, which resulted in the formation of a tropical depression on August 8. Six hours later, it was upgraded into Tropical storm Ismael. Continuing to intensify, Ismael was upgraded into a hurricane late on August 10 and subsequently developed an eye. After bypassing the Revillagigedo Islands, the storm reached its peak wind speed of 100 mph. Late on August 11, Hurricane Ismael began to weaken as it encountered cooler waters. The following day, Ismael was downgraded into a tropical storm. On August 14, the storm was downgraded into a tropical depression approximately 250 mi west of Point Ensenada. After turning north, Ismael dissipated later that day near Guadalupe Island.

While still out at sea, Ismael brought 6 - 9 ft waves to Southern California, though waves from the storm were less than expected. One person was swept away at a beach. The remnants of the storm later moved over the region, resulting in moderate rainfall. The Yucca Valley was the worst hit by the storm, where nearly every road was washed out. Almost 50,000 residents were isolated due to rains. A tornado was spotted near Los Angeles, causing minor damage. In San Bernardino, many buildings were destroyed. Around 80,000 homes were left without power across the Inland Empire. Moreover, three interstates were closed. In all, minor injuries were reported, three people died in San Bernardino when their car swept into a channel, and an engineer was killed returning to China Lake when her car was swept into a wash. Damage in the region totaled $19 million (1983 USD). After affecting California, the remnants of the hurricane moved into Nevada. Many parking lots in Laughlin were flooded; two small towns in Clark County were also isolated. Furthermore, several major streets along the outskirts of Las Vegas were closed because of flooding.

Meteorological history
Hurricane Ismael originated from a northward bulge of the ITCZ in early August. On August 7, the Eastern Pacific Hurricane Center (EPHC) reported that this bulge had resulted in the formation of a tropical disturbance centered 500 mi south of Acapulco. Late on August 8, the system was upgraded into a tropical depression. Initially, the storm was expected to turn west and remain at sea; however, the depression turned northwest instead. Six hours after becoming a tropical cyclone, the low was upgraded into Tropical Storm Ismael.

After remaining a marginal tropical storm for 18 hours, Ismael began to deepen and by August 10, it was approaching hurricane intensity. By this time, the storm was forecast to accelerate and approach Guadalupe Island in three days. At 1800 UTC on August 10, Ismael was upgraded into a hurricane. At 0245 UTC the next day, an eye began to form as the system passed east of the outer Revillagigedo Islands. Nine hours later, the EPHC upgraded the storm into a Category 2 hurricane on the Saffir-Simpson Hurricane Wind Scale (SSHWS); simultaneously, the storm reached its peak of 100 mph. At the time of its peak, Hurricane Ismael was located about 400 mi west of Cabo San Lucas. Sandwiched between a ridge to the west of the hurricane and a trough off the coast of California, Ismael turned west-northwest and accelerated.

Late on August 11, Hurricane Ismael began to weaken as it encountered cooler waters. According to the EPHC, the storm was downgraded to a Category 1 on the SSHWS late on August 11. The following day, Ismael was downgraded into a tropical storm about 380 mi west of the Baja California Peninsula. On August 13, Hurricane Hunters flew through the storm, penetrating the center of circulation twice. During its first penetration, the aircraft reported winds of 40 mph just east of the center and also noted that the weakening system had a poorly defined eye. Two hours later, the aircraft made its second pass through Tropical Storm Ismael, with the aircraft reporting winds of 35 mph. Based on this, the storm was downgraded into a tropical depression while centered about 250 mi west of Point Ensenada. After turning north and entering even cooler waters, the storm made landfall on Guadalupe. The depression dissipated later on August 14 about 20 mi southwest of Guadalupe Island which is not normally affected by tropical cyclones.

California
While still out at sea, Ismael brought rough seas that lead to one home on the Capistrano Beach being ruled unsafe. Although waves from the storm were less than expected, swells of 6 - 9 ft were estimated along south-facing beaches near Santa Barbara. In Malibu, one home was damaged due to the increased surf. In Laguna Beach, in southern Orange County, a 20-year-old woman was swept off rocks and later died. Overall, Hurricane Ismael was one of six tropical cyclones to bring high waves to the state within a span of a month.

On August 11, the outer rainbands of Hurricane Ismael brought unseasonably high humidity and thunderstorms to Southern California. Subsequently, flash flood watches were posted for much of Southern California. The remnants of the storm eventually moved over the area, resulting in significant flooding. Some areas sustained 2 in of rain, leading to water depths of 2 to 4 ft on roadways. The towns of Joshua Tree, Yucca Valley, Twentynine Palms, California, and Landers were the hardest hit. Nearly every road was washed out in the Yucca Valley.

Almost 50,000 residents in Palm Springs were isolated due to brief, but heavy rains. In addition, a tornado damaged two homes and over seven chimneys near Los Angeles. Heavy rains also drenched the cities of Riverside and San Bernardino while flooding several homes. In the latter, many buildings were destroyed, forcing widespread evacuations. In Rancho Mirage, 24 homes were damaged. One woman had to be rescued after she was swept 3 mi downstream a river in Los Angeles. Around 80,000 homes were left without power across the Inland Empire, though within 24 hours after the outage, power was restored to all but 4,000 residents. Moreover, portions of Interstate 10, Interstate 15, and 215 were closed. The highway the lead into Palm Springs was closed as well, resulting in major traffic jams. In all, minor injuries were reported. However, three people died in San Bernardino when their car swept into a channel. Damage from the storm totaled $19 million (1983 USD).

Nevada
Heavy rains that preceded the storm forced thousands of gamblers along the Las Vegas Strip to be evacuated and left two people missing. The remnants of the storm later moved into the region, bringing additional flooding. Many parking lots in the resort town of Laughlin were flooded. Furthermore, the villages of Searchlight and Blue Diamond were isolated due to flooding. Several major streets in Paradise were closed because of flooding and sandbag barriers were erected alongside Caesars Palace to prevent further flood damage. In addition, record river levels were measured along the Amargosa River near Death Valley.

Elsewhere
In the Mexican states of Baja California and Baja California Sur, the storm brought high clouds over the region for several days. In Ensenada, minor flooding was recorded. Along the peninsula, waves up to 8 ft were measured.

Residents of Davis County, Utah that were in close proximity of streams were put on alert due to the threat of flooding. The remnants of Hurricane Ismael ultimately brought thunderstorms to Arizona and Utah. In Mohave County, up to 3 in of rain was recorded. Further south and west, in Phoenix, a thunderstorm flooded streets and brought down power lines.