Alaska
Bishop Rock’s oversized effect on Yukon River breakup
A few weeks ago, as my friend Forest and I rode our bikes on the vast white sheet of the frozen Yukon River downstream of Galena, the river forced us into a 90-degree hard left. There, the channel suddenly necked down from being almost a mile wide to just a quarter mile.
A 300-foot outcrop known as Bishop Rock sits at this pinch point on the middle Yukon. Its name — bestowed by someone in remembrance of an Oregon missionary who was murdered there in 1885 — comes up at this time every year when people start talking about river breakup and the potential for ice-jam flooding.
Kyle Van Peursem of the Alaska Pacific River Forecast Center mentioned Bishop Rock during a recent presentation on the potential for spring floods in communities along the state’s rivers.
Though the Yukon, Kuskokwim, Koyukuk and other rivers in central and northern Alaska are all very solid and white as of this writing, that will soon change. River breakup happens when the power of the sun melts feet of snow from the landscape and rots the ice of the river that was hard as iron for so dang long.
Predicting when breakup will occur at any of the dozens of villages along river systems is an inexact science. The most important variable is air temperature. Warmer Aprils are good, Van Peursem said, because they allow the snow and ice to melt at a more gradual rate that won’t overwhelm river channels.

The biggest driver of the dynamic breakups that flood villages is a cold April that “compresses the time to get rid of snowmelt,” he said.
Alaska villages on rivers most often flood in springtime due to ice jams. Jams happen when meltwater shoves chunks of recently broken ice sheets together.
“I think of these as like a dam in the river,” Van Peursem said. “The breakup front (a conveyor belt of ice chunks) stops, water has no place to go and piles up behind it.”
Constrictions in rivers like Bishop Rock are common places for ice jams. In 2013, a pileup at Bishop Rock swelled the river upstream like a python and flooded Galena. The same happened in 1945, when U.S. Air Force bomber pilots dropped more than 75 bombs on the ice jam in front of Bishop Rock. They failed to dislodge the mass of ice.
Bishop Rock will soon loom large in windows of a single-engine aircraft in which Van Peursem will fly. He will monitor that portion of the Yukon River on flights from Galena as part of the Riverwatch program.
Van Peursem said the part of the Yukon he is monitoring is trending toward a dynamic breakup due to a cold April — Galena’s low temperature on April 22, 2026, was in the single digits Fahrenheit — but “hopefully we can slowly warm up as we go into May.”
A note to my readers: This, friends, is the second-to-last Alaska Science Forum I will write. After 31 years in the saddle, I am retiring from my science-writer job here at the Geophysical Institute on May 1, 2026. Though I have planned this for a while, the date sure has snuck up. I will sum up the whole adventure in my final column next week.
And — fear not — my boss and other leaders at the Geophysical Institute are committed to continuing the Alaska Science Forum after I leave.
Alaska
Southwest Airlines Begins First-Ever Alaska Service at Anchorage
ANCHORAGE — Southwest Airlines (WN) has launched its first-ever service to Alaska, beginning seasonal flights to Ted Stevens Anchorage International Airport (ANC) from Denver International Airport (DEN) and Harry Reid International Airport (LAS).
The carrier scheduled Anchorage service to begin on May 15, 2026, with once-daily flights through the summer from both Denver and Las Vegas. Southwest’s booking site now markets Anchorage flights, with fares and connecting itineraries visible from multiple U.S. cities.
Southwest adds its 43rd state
Anchorage becomes Southwest’s 122nd airport and brings Alaska into the carrier’s domestic network as its 43rd U.S. state. The airline had announced the move in October 2025, describing Anchorage as one of several new 2026 destinations added as part of a broader network expansion.
The launch follows Southwest’s recent additions of St. Thomas, U.S. Virgin Islands; Knoxville, Tennessee; Sint Maarten; and Santa Rosa/Sonoma County, California. Anchorage is the most geographically distinct of those additions, extending Southwest’s map into a market where air travel is unusually central to state connectivity.
Why anchorage matters
For Alaska, Southwest’s arrival adds another large U.S. carrier at ANC and increases competition on two important Lower 48 corridors. Alaska transportation officials framed the service as a boost for passenger choice, tourism, business travel, and broader state connectivity.
The Denver and Las Vegas launch points are also strategic. Denver gives Southwest a strong inland connecting point to much of its domestic network, while Las Vegas adds another high-volume leisure gateway. Together, the routes allow Southwest to test Alaska demand without immediately entering more crowded West Coast-to-Anchorage markets.
Part of a larger southwest reset
The Anchorage launch comes as Southwest continues to reshape both its network and onboard product. The airline has been rolling out assigned and premium seating, free Wi-Fi for Rapid Rewards members, and in-seat power on Boeing 737-8 aircraft as part of its redesigned cabin strategy.
That context matters. Anchorage is not just a novelty dot on the map; it is part of Southwest’s wider attempt to broaden vacation demand, strengthen connecting relevance, and enter markets that historically sat outside its traditional network profile.
Impacts
For travelers, the immediate impact is simple: Anchorage now has new seasonal nonstop options from Denver and Las Vegas, backed by Southwest’s large connecting network. For ANC, the service adds another national carrier during the peak summer travel window.
For Southwest, Alaska is a symbolic and strategic expansion. The carrier is moving beyond its old domestic playbook, adding more geographically ambitious destinations while modernizing the product around assigned seating, premium options, and loyalty benefits. The real test will be whether Anchorage performs strongly enough to return beyond the initial summer season.
Alaska
‘Minimal fire activity observed’, Firefighters work to put out fire in area burned in 2014 Funny River Fire
ANCHORAGE, Alaska (KTUU) – Firefighters are battling a human caused fire on the Kenai Peninsula, the Alaska Division of Forestry and Fire Protection (DOF) said.
The Killey River Fire was discovered Friday evening, DOF said. A pilot and a boat operator reported it.
“It is burning along the edge of the waterway in the burned area of the 2014 Funny River Fire,” DOF said. The fire “is about 2.25-miles up the Killey River from its confluence with the Kenai River.”
As of Saturday morning, the fire was about 8.2 acres.
“[Precipitation], helicopter bucket drops, and the air tanker slowed the fire and allowed firefighters to cut saw line and build hose lays around the fire,” DOF said Saturday.
In a note from Saturday on the Alaska Interagency Coordination Center Situation Dashboard, it said minimal fire activity was observed after firefighters worked “around snags in the old fire scar. The crew engaged to secure the west side of the fire with anticipation of strong gusts from the east.”
Burn permits have been suspended in the Kenai-Kodiak area, as well as the Fairbanks and Delta prevention areas, DOF said.
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Alaska
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