A glacial lake outburst flood (GLOF) triggered a rapid surge in water levels along the Teesta River basin in Sikkim, India at approximately 01:30 LT on Wednesday, October 4, 2023. The water levels soared to heights of 5 – 6 m (15 – 20 feet), resulting in significant infrastructure damage, at least 8 fatalities, and more than 60 individuals reported missing.
A storm system exiting the West will trigger widespread severe thunderstorms across the Plains on Tuesday. These storms are expected to produce large hail, damaging winds, heavy rain, possible flooding and a couple of tornadoes across the region. Ahead of this sprawling system, a number of record high temperatures are possible from the Upper Mississippi Valley and Great Lakes into the Northeast.
Record-breaking rainfall submerged streets and disrupted travel across the New York City metropolitan area on September 29, 2023. The deluge set new daily records and made this month the wettest September in New York City’s recorded history.
On September 27, 2023, a powerful weather system named Storm Elias brought a second wave of severe flooding to central Greece, particularly affecting the city of Volos and the island of Evia. The storm came on the heels of the devastating Storm Daniel earlier this month.
On September 25, 2023, flash floods ravaged the small community in the municipality of Autlán de Navarro in Jalisco, Mexico. The sudden surge in the El Jalocote stream led to eight confirmed deaths, three missing persons, and significant property damage.
Heavy rain caused the El Naranjo River to break its banks in the early hours of September 25, 2023, near Guatemala City. The flash floods destroyed six homes in the shantytown of Dios Es Fiel, claiming at least six lives and leaving 12 others missing.
Heavy rainfall and the bursting of river banks led to severe flooding in the Western Cape area of South Africa from September 23 to 26, 2023. The disaster resulted in multiple fatalities, thousands of evacuations, and significant infrastructure damage.
Storm Agnes formed on September 25, 2023, as the first named system of the 2023/24 North Atlantic storm season. Agnes is set to bring severe winds and waves to Ireland and the UK on Wednesday, September 27, 2023. Forecasters are particularly concerned due to unusually high sea surface temperatures in the Atlantic, which are contributing to the storm’s rapid intensification.
A powerful storm dubbed Daniel dropped exceptionally high amounts of rain over parts of central Greece on September 4 and 5, 2023, resulting in widespread flooding, destruction, and the tragic loss of at least 10 lives. Experts label this as the country’s worst storm since records began in 1930. The worst affected was the Thessaly Region, particularly its Magnesia prefecture.
At least four people died Monday, September 4, 2023, after an extratropical cyclone dumped extremely heavy rains that triggered severe floods and landslides in the southernmost Brazilian state of Rio Grande do Sul. Parts of the northern half of the state received 2 and even 3 months’ worth of September rains in just 72 hours.
