Since 2011, outburst floods from the glacial-dammed lake at Suicide Basin have been released into Mendenhall Lake and subsequently the Mendenhall River. The record setting flood of 2016 was at 11.99 feet. Flood stage is at 9′.
A home falls into the Mendenhall River after the bank gave way from the outburst flood.
That record was broken this weekend, when the flood waters burst from Suicide Basin. The water level crested at 14.97 feet. Several homes along the river had the bank cut out from under them, with at least one collapsing into the rushing current.
It was estimated that water was flowing at 20,900 cubic feet per second down the Mendenhall River.
Mount Katmai in the foreground, with Trident, Mageik, and Martin in the background; Photo credit AVO
We have had a lot of volcanic activity in Alaska this year. We currently have six volcanos at an elevated alert level of either Code Yellow or Code Orange.
Trident Volcano
None are more intriguing to me than the newest member of Code Yellow: Trident Volcano in Katmai National Park. Trident is a member of what is known as The Katmai Cluster. In addition to Trident, the cluster includes Mount Katmai, Mount Mageik, Mount Martin and Novarupta.
The Katmai Volcanic Cluster; Map credit: AVO
Trident has seen an increase in activity the past year, but since May, the earthquake frequency underneath the volcano has gone up considerably. Add that to the ground uptick at Trident, and you have the signs of moving magma. Katmai, Mageik and Martin have all seen an increase in seismic activity recently, as well.
Trident was last active between 1953-1974, when it went quiet. The eruptions of ’53 and ’74 formed new vents, which means it could be difficult to pinpoint exactly where an eruption could come from.
On June 6, 1912, the largest volcanic eruption of the 20th Century exploded out of the Katmai Cluster. For years, it was assumed that Mount Katmai was the culprit. It wasn’t until 1953 that Novarupta was determined to be the source. The majority of the magma was lying beneath Mount Katmai, but when the cluster erupted, the explosion came out of Novarupta, which is 6.5 miles away. Mount Katmai then collapsed into itself. Trident Volcano stands just 3 miles from Novarupta.
The amount of magma expelled from Novarupta was 30 times that of Mount St Helens. The devastation of the eruption formed the valley we now know as The Valley of Ten Thousand Smokes.
Shishaldin Volcanoon July 14th; Photo credit: Lee Cooper, onboard the Canadian Coast Guard icebreaker Sir Wilfrid Laurier/AVO
Mount Shishaldin on Unimak Island has been restless for a while. A USCG plane flying by noticed molten lava at the crater last week. Finally, on Friday the volcano erupted with a plume of ash that reached 15,000 feet. By Saturday evening, the eruption had earned a Level Red Warning, which had returned to Orange by Sunday night.
I have not heard of a major disruption to air traffic yet.
Great Sitkin, further out on the Aleutian Chain is also at Warning Level Orange.
Late on Saturday night, a 7.2 magnitude earthquake was recorded 55 miles southwest of Sand Point, Alaska. That triggered a Tsunami Warning from NOAA and the NWS for early Sunday morning. Luckily, waves of only 6″ high were reported, and the warning was cancelled long before I even woke up in the Interior of Alaska.
By Sunday evening, the Alaska Earthquake Center had recorded roughly two dozen aftershocks from the M7.2 quake, the largest at M5.7.
Not to be left out, the city of Anchorage had a gang of emus on the loose. No word on where the emus escaped from. At one point, they were reportedly spotted near the Campbell Airstrip, which I can say from experience, is a great place to start a hike. I also read through the comments on the post, and I must say that not one was remotely helpful on catching a runaway emu.
An ice jam right at the mouth of the Nowitna River; Photo credit: The NWS and the River Watch Team
It’s the time of year where we all watch the rivers up here. Break-up in Fairbanks has lost the drama it had in the early days, before the flood control tamed the Chena River. There was a time when the Cushman Street bridge was rebuilt every year after the ice took it out.
Elsewhere across Alaska, the shifting ice still packs a punch. The ice jam in the above photo has caused flooding 90 miles upstream. Tanana, Alaska has experienced minor flooding from this. Communities all along the Yukon, from Eagle to Buckland have experienced severe flooding.
The Kobuk River has been added to the flood stage list. An ice jam could bring flooding from Kobuk to Ambler if the ice doesn’t break up soon.
Graphic credit: NWS and NOAA
In Fairbanks, we saw our first 80F degree day this season on Friday. It broke a record for not just the high temp of the day, but also broke a record for the highest low temperature for the day. It was the earliest 60F degree low on record for Fairbanks. It was certainly noticeable when I went out in the morning.
Photo credit: NWS-Fairbanks; University of Alaska – Fairbanks campus
The phenomenon known as Green-up occurred on May 16 this year. In one day, the tree buds burst open, giving the hills around Fairbanks a very sudden green tint.
There is a lot of snow on the ground still. Anywhere from 12-18″ of depth, but the 50F degrees this past weekend has put the melt on. Lots of sun right now too:
Length of day: 16 hrs, 53 mins
Length of visible light: 19 hrs, 17 mins
Today will be 6 mins and 59 secs longer than yesterday.
The beavers have open water in front of their lodge, which happens for two reasons. Their swimming back and forth helps to keep the ice thinner, but there is also a methane release point in the same location, which helps to do the same thing. In fact, the circles of diminished ice in the background, are also methane pockets.
Residents of Sitka awoke that morning to beautiful, clear skies. It was a perfect day, until someone looked across Sitka Sound to Kruzof Island and its dominate feature: The long dormant volcano, Mount Edgecumbe. Black smoke could clearly be seen rising from the volcano’s crater.
Word spread quickly. Residents poured out to the beach to stare across the Sound. The authorities began taking call after call from concerned citizens. A U.S. Coast Guard commander radioed the admiral in Juneau. A helicopter was sent out to investigate.
As the Coast Guard pilot approached the crater, the smoke plume grew in size. He eased over the crater edge and peered down into the abyss, only to see a pile of burning car tires. Spray painted into the snow, in 50 foot tall letters was : APRIL FOOL.
“Porky” Bickar first thought of the idea of the fake eruption in 1971. He hoarded old tires for the next three years, and when April 1, 1974 neared, with its perfect weather forecast, Porky knew the time had come. His wife had one request: “Don’t make an ass of yourself”.
There ended up being one catch. The first two pilots contacted to fly the tires into the crater refused to go along with the prank. But the third one proved to be the charm, and Earl Walker of Petersburg was enlisted.
The tires were loaded up into two slings and hauled out to the crater along with several gallons of kerosene, and a few smoke bombs for good measure. When the pilot went back to Sitka for the second sling, Porky worked on writing the message in the snow.
The pranksters were not totally irresponsible. They had contacted both the FAA and local police, and clued them in on the joke. They did forget all about the Coast Guard, however.
The reaction in Sitka was overwhelmingly positive after residents realized that the volcano was not going to blow. The Admiral who sent the helicopter out to investigate, met Porky at a 4th of July party years later. He admitted to Porky that the prank was a “classic”. Alaska Airlines even used the stunt in a 1975 advertising campaign that highlighted the “irreverent spirit of Alaskans”.
Oliver “Porky” Bickar, was 50 years old at the time of the prank. A WWII vet, having taken part in the D-Day invasion, Porky came to Sitka with his wife in 1960. He was known for ending the All-Alaska Logging Championships, by felling a tree on a target. The target was usually a hard hat. Porky was also a talented artist working in metal.
Most importantly, Porky may be Alaska’s top prankster. On a personal note, I enjoyed reading how he would place pink, plastic flamingoes in trees along the shore for the tourist boats. A man truly worthy of his legend status.
Mount Edgecumbe, as seen from Thomsen Harbor, Sitka, Alaska; Photo credit:U.S. Forest Service/Jeffrey Wickett
Last April, a series of earthquakes around and under Mount Edgecumbe brought greater attention to what was considered a dormant volcano. Measurements show that magma is moving deep underneath Edgecumbe. Other signs have also brought new scrutiny: Hikers have discovered vents with bubbling gas near the volcano, and satellite images show a bulging of the ground around Edgecumbe.
None of this means that Edgecumbe will blow anytime soon, but the State of Alaska has reclassified Mount Edgecumbe as a “high risk volcano”. With 73,000 people living in the region, the reclassification was probably wise. Currently, the east side of Edgecumbe is bulging faster than any volcano in Alaska.
The Alaska Volcano Observatory has plans to install seismic sensors and other instruments on Mount Edgecumbe over the coming months. Core samples show that the volcano erupted between 4000 -4300 years ago, and Tlingit oral history tells of an eruption approximately 800 years ago.
Currently, Alaska has one volcano at Code Orange, and four others at Code Yellow.
Unrest under Mount Edgecumbe and a bulging eastern flank
The storm that took over the Alaskan skies last night was pretty impressive. The entire sky lit up to the point that the snow on the ground glowed green.
I heard that last night’s magnetic storm was rated a Kp7. The Kp index rates the magnitude of a geomagnetic disturbance. A 0, 1 or 2 is considered “Quiet”. A Kp3 is “Unsettled”. Kp4 = “Active”. Kp5 is a “Minor Storm” G1. Kp6 is a “Moderate Storm” G2, while last night’s Kp7 is considered a “Strong Storm” G3. Kp8 and Kp9 top the index as “Severe Storm” G4 and “Extreme Storm” G5, respectively.
There are some really incredible images out there online from last night’s Strong Storm. The two here are only cell phone images, and they do not do the aurora justice. It was really a phenomenal show. As you can see, we were not limited to just the green northern lights, but quite a bit of red was visible to the naked eye.
The skies were crystal clear, as expected, with temps dipping down to -32F at the cabin. I can’t wait to see if we get a second round tonight.
A magnetic storm is headed our way from the sun, which should offer great aurora viewing Sunday and Monday. Hopefully the clear skies hang around tonight. With a forecast of -20F, I am assuming we will have the all clear for the aurora.
