#YTwx
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mariolanzas.bsky.social
PELYCOSAURIA, from the video: www.youtube.com/watch?v=ytWx... dedicated to early Synapsids. Many more more kinds of Synapsids are included there. 🐉 Pelycosaurs are known for their back sails, very trendy in the early Permian 🐉 #pelycosauria #synapsids #permian #dimetrodon #paleoart
December 6, 2025 at 12:25 PM
mariolanzas.bsky.social
Some primitive SYNAPSIDS, from the video: www.youtube.com/watch?v=ytWx... 💀 More are included in there 💀 This poster is now also available for prints and more at Redbubble/people/MarioLanzas 💀 #synapsida #permian #triassic #paleoart #gorgonops #lisowicia
December 14, 2025 at 8:29 PM
alaskawx.bsky.social
The cold snap in Alaska and the Yukon is now into week four and will continue for days. The latest from the Alaska and Arctic Climate newsletter provides some background on long duration cold events in northwest North America. #akwx #ytwx #Arctic #Climate

alaskaclimate.substack.com/p/ongoing-co...
December 28, 2025 at 3:43 AM
alaskawx.bsky.social
December 2025 in the Yukon Territory was the easily the coldest December since 1980, 9ºC below the 1991-2020 baseline average. Coldest any month since Jan 1996. ERA5 data courtesy @copernicusecmwf.bsky.social. #ytwx #Canada @explorenorth.bsky.social @jkanadisk.bsky.social @evaholland.bsky.social
January 5, 2026 at 4:06 AM
alaskawx.bsky.social
Ice broke on the Yukon River at Dawson, YT at 1056am MDT Wednesday. This is the tenth earliest break-up in 130 years of observations. Four of the ten earliest break-ups have occurred in the past decade. #ytwx #ClimateChange @radtek58.bsky.social @jkanadisk.bsky.social @climatologist49.bsky.social
May 1, 2025 at 1:59 AM
alaskawx.bsky.social
Sunday morning low temperatures through 9am AKST:

Chicken: -63F (-52.8C)
Tok: -60F (-51.1C)
Northway: -59F (-50.6C)
Beaver Crk, YT: -57F (-49.7C)
Eagle Airport: -56F (-48.9C)
Dawson, YT: -56F (-48.7C)
Ft. Yukon: -55F (-48.3C)
Nenana: -54F (-47.8C)
Fairbanks Airport: -50F (-50.6C)
#Cold #akwx #ytwx
January 4, 2026 at 6:09 PM
alaskawx.bsky.social
Now for something completely chilling: Dec 2025 average temps…
Chicken, AK: -35.5F,-37.5C
Ft. Yukon, AK: -31.2F, -35.1C
Dawson, YT: -30.8F, -34.9C
Mayo, YT: -29.9F, -34.4C
Tok, AK: -29.8F, -33.8C
Northway, AK: -28.8F, -33.8C
Fairbanks, AK: -22.8F, -30.4C
Whitehorse, YT: -15.0F, -26.1C
#akwx #ytwx
January 3, 2026 at 4:21 AM
alaskawx.bsky.social
Yukon Territory, Canada had the coldest March since at least 1950, easily exceeding 2007 and 1964. There is no significant long term trend in March average temps. Data from ERA5 reanalysis courtesy @copernicusecmwf.bsky.social. #ytwx #Canada #Climate @jkanadisk.bsky.social @evaholland.bsky.social
April 5, 2026 at 3:39 AM
alaskawx.bsky.social
The December and early January cold snap across Alaska and NW Canada may well turn out to be one of the coldest multi-week events of the 21st century. Lots of details in the latest from the Alaska and Arctic Climate newsletter. #akwx #ytwx #Arctic #Climate

alaskaclimate.substack.com/p/alaska-and...
Splash screen for the post: Alaska and NW Canada Cold Snap Review: Winter 2025-26 is one to remember
February 2, 2026 at 7:50 AM
alaskawx.bsky.social
June 2025 Arctic sea ice and wildfire post now up on the Alaska and Arctic Climate Newsletter. The big news is that sea ice extent is near record low. #akwx #ytwx #Arctic #Climate #SeaIce #Wildfire @climatologist49.bsky.social

alaskaclimate.substack.com/p/june-2025-...
July 3, 2025 at 9:57 PM
alaskawx.bsky.social
Tuesday low temperatures reported through 9pm MST/7pm AKST for the Yukon Territory/Alaska border county:

Northway, AK -46.1C/-51F
Tok, AK: -47.2C/-53F
Beaver Creek, YT: -46.9C/-52F
Burwash, YT: -45.7C/-50F
Dawson, YT: -43.5C/-46F
Whitehorse, YT: -36.2C/-33F
#akwx #ytwx
@explorenorth.bsky.social
December 10, 2025 at 4:56 AM
alaskawx.bsky.social
Yukon climate factoid: the temperature at Dawson remained below -15C from December 5 through January 15, and all but three of those days had high temperatures below -20C. Also, 25 days with lows in the 40s below with a low of -49.1C on Jan 4th. #ytwx @jkanadisk.bsky.social @explorenorth.bsky.social
January 18, 2026 at 1:09 AM
alaskawx.bsky.social
The 2025 wildfire season is about done in Alaska and the Yukon Territory, but is still going in the NWT. Seasonal review for northern North America wildfire now posted in the latest from the Alaska and Arctic Climate newsletter. #akwx #ytwx #ntwx #Canada

alaskaclimate.substack.com/p/summer-202...
Splash screen for the post “Summer 2025 Northern North American Wildfire: Above median but less than 2022-2024
September 1, 2025 at 6:08 AM
alaskawx.bsky.social
Now we've got serious cold. At 6am AKDT/8am MDT Monday, -62F/-52C at Faro, YT and -60F/-51C at Carmacks, YT. In Alaska, Northway at -55F/-48C. #akwx #ytwx #Weather #Cold #Winter2026 @climatologist49.bsky.social@evaholland.bsky.social
Map centered on the southern Yukon Territory showing aviation weather observations at specific locations at 6am AKST/8am MST Monday, December 22, 2025.
December 22, 2025 at 3:45 PM
alaskawx.bsky.social
Seems unimportant in this moment, but if keeping up with environmental conditions in the North can bring you a calmer few minutes, here's an update on the status of the Arctic and Alaska and vicinity snowpack as of mid-January. #Arctic #akwx #ytwx #Snow

alaskaclimate.substack.com/p/january-20...
Splash screen for the post: January 2026 Arctic and Alaska Snowpack: Regional variability rules
January 24, 2026 at 9:34 PM
alaskawx.bsky.social
Friday was the 19th consecutive days with a low temperature of -40C/F or lower at Dawson, Yukon Territory. The streak could end today. The record longest such streak is "at least" 33 days, Nov 29 to Dec 31, 1917. Data courtesy ECCC. #ytwx #Winter2026 @jkanadisk.bsky.social @explorenorth.bsky.social
December 27, 2025 at 10:36 PM
alaskawx.bsky.social
Spring river break-up on the big rivers in Alaska and the Yukon Territory is under way. No big problems so far. Details and the climate context of this year’s break-up in the latest from the Alaska and Arctic Climate newsletter. #akwx #ytwx #Spring2026
alaskaclimate.substack.com/p/spring-202...
Splash screen for the post Spring 2026 River Break-up to May 8: So far, no big problems.
May 8, 2026 at 7:19 PM
alaskawx.bsky.social
Ice went out on the Yukon River at Dawson, YT on Wednesday. @jkanadisk.bsky.social do we have an official time?
Webcam image from 419pm MDT looking west-northwest across the Yukon River courtesy Yukon River Ice Pool. #ytwx #Spring2025. @climatologist49.bsky.social
Webcam image from atop the fire station in Dawson looking across the Yukon River to the hill beyond and mostly cloudy skies above.
April 30, 2025 at 11:26 PM
alaskawx.bsky.social
Low temperatures (ºC) in and around Alaska on Sunday. Really cold except for the lower Alaska Peninsula and Aleutians/Pribilofs. #akwx #ytwx #weather @explorenorth.bsky.social @jkanadisk.bsky.social
Map centered on Alaska showing site-specific high temperatures (ºC) on Sunday, January 4, 2026. Plotted temperature range from -53C at Chicken to +4C at Unalaska.
January 5, 2026 at 2:42 PM
alaskawx.bsky.social
Alaska and Yukon Territory Thursday early morning PM 2.5 air quality index mostly in the "sensitive" category in central Interior Alaska and in the Whitehorse area from wildfire smoke. Otherwise "moderate". Data and graphic courtesy PurpleAir. #akwx #ytwx #Summer2025 #Smoke #Wildfire
Map of Alaska and the Yukon Territory showing reported PM2.5 AQI values at about 7am AKDT/8am MST Thursday, June 19, 2025.
June 19, 2025 at 3:20 PM
alaskawx.bsky.social
March 2026 was exceptionally sunny over most of the Alaska, Yukon Territory and NWT in ERA5 reanalysis courtesy @copernicusecmwf.bsky.social. For much of central Alaska there was more sunshine than in any March since 1979. Graphic courtesy @climatologist49.bsky.social. #akwx #ytwx #ntwx #Climate
Map centered on eastern Alaska showing the total solar radiation in March 2026 compared to all Marchs since 1979.
April 6, 2026 at 4:19 AM
alaskawx.bsky.social
On December 22, the overall Yukon Territory average temperature was just over 20ºC (37ºF) below normal. For Alaska, almost 11ºC (19ºF) below normal. Base on ERA5 Land courtesy of ECMWF/Copernicus. #akwx #ytwx #Winter2026 @climatologist49.bsky.social
Map centered on Alaska showing the December 22, 2025 average temperature difference from the 1991-2020 baseline average.
December 30, 2025 at 3:47 AM
alaskawx.bsky.social
Northern North America wildfire area burned updated to Sunday. Area burned is higher than last year at this point in the season. Alaska has burned about 42 percent more area, Yukon Territory about 17 percent more and the Northwest Territories about 4 percent more. #akwx #ytwx #ntwx #Wildfire2025
Map from NASA FIRMS with the area burned to July 27, 2025 for Alaska, Yukon Territory and Northwest Territories annotated.
July 28, 2025 at 4:06 PM
alaskawx.bsky.social
Ice went out on the Yukon River at Dawson, Yukon Territory Tuesday afternoon. A few days later than average by recent standards, but would have been early prior to 1970. Data courtesy yukonriverbreakup.com
#ytwx #Climate @jkanadisk.bsky.social @evaholland.bsky.social @explorenorth.bsky.social
Time series plot of the date of break-up of the Yukon River at Dawson, Yukon Territory each year 1896 to 2026. The two earliest and ten latest dates are highlighted, as is an estimated time-varying average.
May 7, 2026 at 3:41 PM
alaskawx.bsky.social
River ice break-up is underway in northwest North America. So far no serious flooding. I’ve got the early results of this year’s break-up in the climate scale context in a new post in the Alaska and Arctic Climate newsletter. #akwx #ytwx #ClimateChange
alaskaclimate.substack.com/p/spring-202...
Splash screen for the post: Spring 2025 River Break-up: Early Results
May 2, 2025 at 7:03 PM