Rick Thoman

Splash screen for the post: Arctic and Alaska September 2025 Climate Summary: Again mild but not so wet

September 2025 Arctic and Alaska climate summary is now posted. Spoiler: Arctic Canada was especially mild. #Arctic #akwx #Climate

alaskaclimate.substack.com/p/arctic-and...

I also have been exercising it and seems to have almost complete compatibility. I hope to use it completely in place of office.

Map centered on Alaska showing site-specific high temperatures (ºF) on Monday, October 6, 2025. Plotted temperature range from 33F Utqiaġvik and several other places to 63F Carmacks, YT.

High temperatures (ºF) in and around Alaska on Monday. Very mild in the southern Yukon Territory. Most of Alaska warmer than normal, especially the eastern Aleutians and northern Southeast. #akwx #weather @climatologist49.bsky.social

As this administration guts climate science & mitigation efforts in the midst of a climate emergency & opens #Alaska to more extraction - we are all left to suffer the consequences. @rick any data on amount of rainfall lately & potential impacts?

September 2025 temperature and precipitation departure from normal for Alaska. @alaskawx.bsky.social

📍sheet’ka, lingit aani

Map centered on Alaska showing site-specific high temperatures (ºF) on Sunday, October 5, 2025. Plotted temperature range from 29F at Arctic Village to 64F at Port Alsworth.

High temperatures (ºF) in and around Alaska on Sunday. Milder than normal in most areas with a bonus boast from downslope warming in some places in Southcentral, central Interior and western Alaska. #akwx #weather @climatologist49.bsky.social

The standard meaning of “chance of precipitation” is probability of 0.01” or more in a specified time period. There is no standard how the amount of rain is calculated/presented.

Line graph time series of 2025's daily Arctic sea ice extent compared to decadal averages from the 1980s to the 2010s. The decadal averages are shown with different colored lines with purple for the 1980s, blue for the 1990s, green for the 2000s, and white for the 2010s. Thin white lines are also shown for each year from 2000 to 2024. 2025 is shown with a thick gold line. There is a long-term decreasing trend in ice extent for every day of the year shown on this graph between August and November by looking at the decadal average line positions.

Monday ice update - #Arctic sea ice extent is currently the 14th lowest on record (JAXA data) 🧪

• about 310,000 km² above the 2010s mean
• about 950,000 km² below the 2000s mean
• about 2,070,000 km² below the 1990s mean
• about 2,720,000 km² below the 1980s mean

More: zacklabe.com/arctic-sea-i...

Thanks for the tag

Huslia today.

Several October records were broken today in Ontario and Québec, up to 31.7° in Luskville, QC (new provincial October record)!

A few missed records:
Ottawa 29.9° (1.0° from record of 2023)
Quebec City 26.7° (1.6° from record of 1949)
Moosonee 29.0° (1.0° from record of 2023)

Screenshot of 1pm AKDT weather conditions at Fairbanks Airport reporting a temperature of 51F.

Over the past 50 years, the average date of the last temperature for the year of 50F or higher at Fairbanks is October 5. And right on schedule, Airport up to 51F (10.6C) at 1pm AKDT Sunday. It's likely that at least one more day early this week will also reach at least 50F. #akwx #weather #Climate

Left: Chukchi Sea daily sea ice extent 1979 to 2025 with the past two years and the smoothed 1991-2020 median highlighted. Right: NWS Alaska region sea ice concentration analysis to October 4, 2025.

Sea ice extent in the Chukchi Sea (northwest of Alaska) has increased rapidly and is now higher than last year and the 1991-2020 median. Unusually early in the season for recent years, some nearshore ice has formed on the Beaufort Sea coast between Pt. Barrow and Harrison Bay. #akwx #Arctic #SeaIce

Map centered on the North Slope showing the September 2025 average temperature (ºC) as the difference from the 1991-2020 baseline average.

September average temperatures around the Arctic were mostly above the 1991-2020 baseline in ERA5 data courtesy @copernicusecmwf.bsky.social. Arctic Canada and the European Arctic were especially mild. Only parts of the central Russian Arctic were notably cooler than average. #Arctic #Climate

Map centered on Alaska showing site-specific high temperatures (ºF) on Saturday, October 4, 2025. Plotted temperature range from 24F at Umiat to 62F at Klawock.

High temperatures (ºF) in and around Alaska on Saturday. Continued cool on the North Slope and in the northern Interior but milder in the southern Interior and western Alaska. Continued mild in Southcentral and Southeast. #akwx #weather @climatologist49.bsky.social

Medieval manuscript image of a dark grey lion with a long tail and an enormous mouth; it is roaring at a person with their hands over their head looking terrified.

grymettan, wk.v: to roar, bellow; to cry out, howl. (GRUE-met-tahn / ˈgry-mɛt-tan)
Image: Marginal lion in the Rothschild Canticles; Flanders, c. 1300; Beinecke Rare Book & Manuscript Library, MS 404 (always hard to find), f. 115v.
#OldEnglish #WOTD

Green line graph time series of average sea surface temperature anomalies for each September from 1850 through 2025 for only the midlatitude region of the North Pacific Ocean. There is large interannual variability, but an overall long-term increasing trend. Anomalies are computed relative to a 1981-2010 baseline. 2025 is a record high.

Record warm ocean temperatures continued in September across the North Pacific Ocean, with a number of consequential impacts (including on downstream weather patterns).

This graph shows the average for a band across the midlatitudes for every September from 1854-2025 using @noaa.gov ERSSTv5 data.

Burwash Landing M4.6 | Alaska Earthquake Center Alaskan Earthquake Center

We have reviewed a magnitude 4.6 event that occurred at 3:20 AM, 8 miles deep and 54 miles W of Burwash Landing in the Yukon Territory.
No reports of this event being felt have been received at this time.
The event page is available at
https://earthquake.alaska.edu/event/025cry2ji8

Clip art sketch of two people in a clearing picking berries

Tanacross #Dene #Language #Alaska

shnąą "my mother"
shtá’ "my father"
shkę́y’ "my husband"
sh’aat "my wife"
shtthé’e "my daughter" (man speaking)
shyaats’é’e "my daughter" (woman speaking)
shs̲h̲aaz "my son" (woman speaking)
shs̲h̲é’e "my son" (man speaking)
shehɬâad "my family"

Map centered on Alaska showing sea surface temperature (ºC) difference from the 1991-2020 baseline for the week of September 27 to October 3, 2025.

Sea surface temperatures for the week ending October are much warmer than normal in the western Bering Sea and mostly above normal elsewhere in the Bering and northern Gulf of Alaska. Below normal SSTs in the Beaufort and northern Chukchi Seas partly sea ice related. #akwx #Arctic #SST

Map centered on Alaska showing site-specific high temperatures (ºF) on Friday, October 3, 2025. Plotted temperature range from 26F at Arctic Village to 63F at Port Heiden.

High temperatures (ºF) in and around Alaska on Friday. Mild in Southcentral and especially on the Bering Sea side of the upper Alaska Peninsula, where downslope southeast winds helped boast temperatures. Seasonably cool on the North Slope. #akwx #weather @climatologist49.bsky.social

A snow-capped mountain range towers over a small town and harbor.

I owe my interest in environmental science to my hometown in Sitka, Alaska. Living in the Tongass, the world’s largest temperate rainforest, has motivated my desire to protect natural resources. Watching ecosystems change and snow disappear as I've grown older makes the impacts of climate change hit

Wonderful Pioneer Peak, Alaska

Today in white ❄️

Ok, thx

Should I be concerned if I have not received a shipping notification?

Map of the area between Fairbanks and Circle Hot Springs, Alaska showing reported snow depths On Friday, October 3, 2025 from a variety of observations. Image courtesy Alaska-Pacific RFC.

Looking to exercise those rock skis? The Yukon-Tanana uplands northeast/east of Fairbanks has got snow. All the reports of more than 4 inches snow depth are at or above 2000 feet MSL. Image courtesy Alaska-Pacific River Forecast Center. #akwx #snow #Autumn2025 @leepetersen.bsky.social

September 2025 #Arctic sea ice extent was the 11th lowest on record for the month...

This was 1,660,000 km² below the 1981-2010 average. September ice extent is decreasing at about 11.86% per decade. Data: nsidc.org/data/seaice_...

Where’s the edit function???
Graphic courtesy PolarWx and @burgwx.bsky.social

Nerd alert: weather models coming into agreement on another major atmospheric river event for western and then Interior Alaska next week. For posterity, here’s the Friday morning GFS Integrated Vapor Transport and 700mb heights forecast valid Tuesday afternoon (Alaska time). #akwx #wxmodels #weather