Latest news with #snowmelt
Yahoo
3 days ago
- Climate
- Yahoo
Major Warning Issued as 'Glacial Outburst' Threatens Record Flooding
Residents in Alaska have been warned to evacuate as snowmelt from the Mendenhall Glacier, which is about 12 miles from Juneau and is a popular tourist attraction, and heavy rains converge to threaten "record" flooding this week. 'A glacial outburst has occurred at Suicide Basin. The basin is releasing and flooding is expected along Mendenhall Lake and River,' Juneau officials said in a Tuesday news release. 'Officials recommend residents in the 17ft lake level inundation zone evacuate the area until the flood waters recede.' Residents In Juneau Warned Officials warned those near Juneau to evacuate the area after they confirmed water started escaping into a huge basin dammed by the glacier. Residents in the area along the river were warned as the water that's being released in the glacial outburst is flowing into the river, putting homes that are closest to the river at risk. The National Weather Service said it expected flooding to peak at 4 p.m. local time Wednesday. 'This will be a new record, based on all of the information that we have,' Nicole Ferrin, a weather service meteorologist, told a news conference Tuesday. What Is Suicide Basin? Suicide Basin is a glacial lake attached to the Mendenhall Glacier that runs up against the western portion of Juneau, per CNN. The basin formed as parts of its glacier melted and retreated and now acts like a giant bucket, filling up with rain, snow and ice that slowly melts over the summer. On Wednesday morning the Mendenhall River eclipsed its record high level of 15.99 feet after rising more than seven feet since the National Weather Service first issues a flood warning for the area on Tuesday. It's expected to crest at around 16.7 feet sometime Wednesday morning, well above the previous record crest set just last August. 'It's very dangerous right now. Stay away if you can,' said Andrew Park, a meteorologist with the National Weather Service in Juneau, warning any mariners in the area to 'keep your eyes peeled for big trees.'Major Warning Issued as 'Glacial Outburst' Threatens Record Flooding first appeared on Men's Journal on Aug 13, 2025
The Independent
7 days ago
- Climate
- The Independent
Parts of Juneau brace for flooding from water slipping past Alaska's Mendenhall Glacier
Sections of Alaska 's capital city are bracing for the arrival of what could be record floodwaters due to rainwater and snowmelt flowing downstream from a basin dammed by the Mendenhall Glacier. Some Juneau residents in the flood zone have evacuated, heeding warnings. On Tuesday morning, authorities confirmed water had started escaping the ice dam, with flooding expected into Wednesday. The Mendenhall Glacier is about 12 miles (19 kilometers) from Juneau, home to 30,000 people, and is a popular tourist attraction due to its proximity to Alaska's capital city and easy access on walking trails. Homes on the city's outskirts are within miles of Mendenhall Lake, which sits below the glacier, and many front the Mendenhall River, into which the glacial outburst is flowing. The National Weather Service said it expected flooding to to peak around 8 a.m. to noon on Wednesday. 'This will be a new record, based on all of the information that we have,' Nicole Ferrin, a weather service meteorologist, told a news conference Tuesday. Basin flooding is a yearly worry Flooding from the basin has become an annual concern since 2011, and in recent years has swept away houses and swamped hundreds of homes. Government agencies installed temporary barriers this year in hopes of protecting several hundred homes in the inundation area from widespread damage. The flooding happens because a smaller glacier near Mendenhall Glacier retreated — a casualty of the warming climate — and left a basin that fills with rainwater and snowmelt each spring and summer. When the water creates enough pressure, it forces its way under or around the ice dam created by the Mendenhall Glacier, enters Mendenhall Lake and eventually flows down the Mendenhall River, as it did Tuesday. Before the basin began overtopping, the water level was rising rapidly — as much as 4 feet (1.22 meters) per day during especially sunny or rainy days, according to the National Weather Service. The city saw successive years of record flooding in 2023 and 2024 — with the river last August cresting at 15.99 feet (4.9 meters), about 1 foot (30 centimeters) over the prior record set a year earlier — and flooding extending farther into the Mendenhall Valley. This year's flooding was predicted to crest at between 16.3 and 16.8 feet (4.96 to 5.12 meters). Last year, nearly 300 residences were damaged. A large outburst can release some 15 billion gallons of water, according to the University of Alaska Southeast and Alaska Climate Adaptation Science Center. That's the equivalent of nearly 23,000 Olympic-size swimming pools. During last year's flood, the flow rate in the rushing Mendenhall River was about half that of Niagara Falls, the researchers say. A temporary levee is installed City officials responded to concerns from property owners this year by working with state, federal and tribal entities to install a temporary levee along roughly 2.5 miles (4 kilometers) of riverbank in an attempt to guard against widespread flooding. The 10,000 'Hesco' barriers are essentially giant sandbags intended to protect more than 460 properties completely during an 18-foot (5.5-meter) flood event, said emergency manager Ryan O'Shaughnessy. The U.S. Army Corps of Engineers is at the start of what's expected to be a yearslong process of studying conditions in the region and examining options for a more permanent solution, such as a levee. The timeline has angered some residents, who say it's unreasonable. Outburst floods are expected to continue as long as the Mendenhall Glacier acts as an ice dam to seal off the basin, which could span another 25 to 60 years, according to the university and science center researchers. ___ Associated Press writer Becky Bohrer in Juneau contributed to this report.
Associated Press
7 days ago
- Climate
- Associated Press
Parts of Juneau brace for flooding from water slipping past Alaska's Mendenhall Glacier
Sections of Alaska's capital city are bracing for the arrival of what could be record floodwaters due to rainwater and snowmelt flowing downstream from a basin dammed by the Mendenhall Glacier. Some Juneau residents in the flood zone have evacuated, heeding warnings. On Tuesday morning, authorities confirmed water had started escaping the ice dam, with flooding expected into Wednesday. The Mendenhall Glacier is about 12 miles (19 kilometers) from Juneau, home to 30,000 people, and is a popular tourist attraction due to its proximity to Alaska's capital city and easy access on walking trails. Homes on the city's outskirts are within miles of Mendenhall Lake, which sits below the glacier, and many front the Mendenhall River, into which the glacial outburst is flowing. The National Weather Service said it expected flooding to to peak around 8 a.m. to noon on Wednesday. 'This will be a new record, based on all of the information that we have,' Nicole Ferrin, a weather service meteorologist, told a news conference Tuesday. Basin flooding is a yearly worry Flooding from the basin has become an annual concern since 2011, and in recent years has swept away houses and swamped hundreds of homes. Government agencies installed temporary barriers this year in hopes of protecting several hundred homes in the inundation area from widespread damage. The flooding happens because a smaller glacier near Mendenhall Glacier retreated — a casualty of the warming climate — and left a basin that fills with rainwater and snowmelt each spring and summer. When the water creates enough pressure, it forces its way under or around the ice dam created by the Mendenhall Glacier, enters Mendenhall Lake and eventually flows down the Mendenhall River, as it did Tuesday. Before the basin began overtopping, the water level was rising rapidly — as much as 4 feet (1.22 meters) per day during especially sunny or rainy days, according to the National Weather Service. The city saw successive years of record flooding in 2023 and 2024 — with the river last August cresting at 15.99 feet (4.9 meters), about 1 foot (30 centimeters) over the prior record set a year earlier — and flooding extending farther into the Mendenhall Valley. This year's flooding was predicted to crest at between 16.3 and 16.8 feet (4.96 to 5.12 meters). Last year, nearly 300 residences were damaged. A large outburst can release some 15 billion gallons of water, according to the University of Alaska Southeast and Alaska Climate Adaptation Science Center. That's the equivalent of nearly 23,000 Olympic-size swimming pools. During last year's flood, the flow rate in the rushing Mendenhall River was about half that of Niagara Falls, the researchers say. A temporary levee is installed City officials responded to concerns from property owners this year by working with state, federal and tribal entities to install a temporary levee along roughly 2.5 miles (4 kilometers) of riverbank in an attempt to guard against widespread flooding. The 10,000 'Hesco' barriers are essentially giant sandbags intended to protect more than 460 properties completely during an 18-foot (5.5-meter) flood event, said emergency manager Ryan O'Shaughnessy. The U.S. Army Corps of Engineers is at the start of what's expected to be a yearslong process of studying conditions in the region and examining options for a more permanent solution, such as a levee. The timeline has angered some residents, who say it's unreasonable. Outburst floods are expected to continue as long as the Mendenhall Glacier acts as an ice dam to seal off the basin, which could span another 25 to 60 years, according to the university and science center researchers. ___ Associated Press writer Becky Bohrer in Juneau contributed to this report.
Washington Post
7 days ago
- Climate
- Washington Post
Parts of Juneau brace for flooding from water slipping past Alaska's Mendenhall Glacier
Sections of Alaska's capital city are bracing for the arrival of what could be record floodwaters due to rainwater and snowmelt flowing downstream from a basin dammed by the Mendenhall Glacier. Some Juneau residents in the flood zone have evacuated, heeding warnings. On Tuesday morning, authorities confirmed water had started escaping the ice dam, with flooding expected into Wednesday. The Mendenhall Glacier is about 12 miles (19 kilometers) from Juneau, home to 30,000 people, and is a popular tourist attraction due to its proximity to Alaska's capital city and easy access on walking trails. Homes on the city's outskirts are within miles of Mendenhall Lake, which sits below the glacier, and many front the Mendenhall River, into which the glacial outburst is flowing. The National Weather Service said it expected flooding to to peak around 8 a.m. to noon on Wednesday. 'This will be a new record, based on all of the information that we have,' Nicole Ferrin, a weather service meteorologist, told a news conference Tuesday. Flooding from the basin has become an annual concern since 2011, and in recent years has swept away houses and swamped hundreds of homes. Government agencies installed temporary barriers this year in hopes of protecting several hundred homes in the inundation area from widespread damage. The flooding happens because a smaller glacier near Mendenhall Glacier retreated — a casualty of the warming climate — and left a basin that fills with rainwater and snowmelt each spring and summer. When the water creates enough pressure, it forces its way under or around the ice dam created by the Mendenhall Glacier, enters Mendenhall Lake and eventually flows down the Mendenhall River, as it did Tuesday. Before the basin began overtopping, the water level was rising rapidly — as much as 4 feet (1.22 meters) per day during especially sunny or rainy days, according to the National Weather Service. The city saw successive years of record flooding in 2023 and 2024 — with the river last August cresting at 15.99 feet (4.9 meters), about 1 foot (30 centimeters) over the prior record set a year earlier — and flooding extending farther into the Mendenhall Valley. This year's flooding was predicted to crest at between 16.3 and 16.8 feet (4.96 to 5.12 meters). Last year, nearly 300 residences were damaged. A large outburst can release some 15 billion gallons of water, according to the University of Alaska Southeast and Alaska Climate Adaptation Science Center. That's the equivalent of nearly 23,000 Olympic-size swimming pools. During last year's flood, the flow rate in the rushing Mendenhall River was about half that of Niagara Falls, the researchers say. City officials responded to concerns from property owners this year by working with state, federal and tribal entities to install a temporary levee along roughly 2.5 miles (4 kilometers) of riverbank in an attempt to guard against widespread flooding. The 10,000 'Hesco' barriers are essentially giant sandbags intended to protect more than 460 properties completely during an 18-foot (5.5-meter) flood event, said emergency manager Ryan O'Shaughnessy. The U.S. Army Corps of Engineers is at the start of what's expected to be a yearslong process of studying conditions in the region and examining options for a more permanent solution, such as a levee. The timeline has angered some residents, who say it's unreasonable. Outburst floods are expected to continue as long as the Mendenhall Glacier acts as an ice dam to seal off the basin, which could span another 25 to 60 years, according to the university and science center researchers. ___ Associated Press writer Becky Bohrer in Juneau contributed to this report.
Yahoo
12-08-2025
- Climate
- Yahoo
Homeowners warned of flood risk as lake starts to break through ice dam
A huge basin of rainwater and snowmelt dammed by Alaska's Mendenhall glacier has started to release, and officials on Tuesday urged residents in some parts of Juneau to evacuate ahead of what could be a record surge of floodwater downstream. Officials in recent days have been warning people in the flood zone to be ready to evacuate. On Tuesday morning, they confirmed water had started escaping the ice dam and flowing downstream, with flooding expected from late on Tuesday into Wednesday. Flooding from the basin has become an annual concern and, in recent years, has swept away houses and swamped hundreds of homes. Government agencies installed a temporary levy this year in hopes of guarding against widespread damage. 'This will be a new record, based on all of the information that we have,' Nicole Ferrin, a National Weather Service meteorologist, told a news conference on Tuesday. The Mendenhall glacier, a thinning, retreating glacier that is a major tourist attraction in south-east Alaska, acts as a dam for Suicide Basin, which fills each spring and summer with rainwater and snowmelt. The basin itself was left behind when a smaller glacier nearby retreated. When the water in the basin builds up enough pressure, it forces its way under or around the ice dam, entering Mendenhall Lake and eventually the Mendenhall River. Before the basin reached the limit of its capacity and began overtopping over the weekend, the water level was rising rapidly – as much as 1.22 metres per day during especially sunny or rainy days, according to the National Weather Service. The threat of so-called glacier outburst flooding has troubled parts of Juneau since 2011. In some years, there has been limited flooding of streets or properties near the lake or river. But 2023 and 2024 marked successive years of record flooding, with the river last August cresting at 4.9m – 30cm over the prior record set a year earlier, and flooding extending farther into the Mendenhall Valley. This year's flooding was predicted to crest at between 4.96m and 5.12m. Last year, nearly 300 residences were damaged. A large outburst can release some 15 billion gallons of water, according to the University of Alaska Southeast and Alaska Climate Adaptation Science Centre. That's the equivalent of nearly 23,000 Olympic-size swimming pools. During last year's flood, the flow rate in the rushing Mendenhall River was about half that of Niagara Falls, the researchers said. City officials responded to concerns from property owners this year by working with state, federal and tribal entities to install a temporary levee along roughly 2.5 miles of riverbank in an attempt to guard against widespread flooding. The installation of about 10,000 1.2m barriers is intended to protect more than 460 properties from flood levels similar to last year, said Nate Rumsey, deputy director with the city's engineering and public works department. The US army corps of engineers is at the start of what is expected to be a years-long process of studying conditions in the region and examining options for a more permanent solution. The timeline has angered some residents, who say it is unreasonable. Outburst floods are expected to continue as long as the Mendenhall Glacier acts as an ice dam to seal off the basin, which could span another 25-60 years, according to the university and science centre researchers.
