Keah
@keah.bsky.social
Meteorology professor in Denver, backyard dahlia grower, cheesehead living in Colorado
Reposted by Keah
Among all the eye-popping numbers in the December summary linked below, it's also the first public appearance of this annual weather/climate visualization which I am quite fond of.
Larger version at climate.colostate.edu/co_cag/index... in case resolution here isn't so good. #cowx
Larger version at climate.colostate.edu/co_cag/index... in case resolution here isn't so good. #cowx
January 14, 2026 at 12:21 AM
Among all the eye-popping numbers in the December summary linked below, it's also the first public appearance of this annual weather/climate visualization which I am quite fond of.
Larger version at climate.colostate.edu/co_cag/index... in case resolution here isn't so good. #cowx
Larger version at climate.colostate.edu/co_cag/index... in case resolution here isn't so good. #cowx
Reposted by Keah
Exceptional. Record-smashing. Disturbingly warm. December 2025 was one for the record books in Colorado.
🌡️ Warmest December
🌡️ >1000 daily high temperature records
🌡️ Warmest October thru December by far
🌡️ 4th-warmest year
Read more in our monthly summary: climate.colostate.edu/monthly_summ...
🌡️ Warmest December
🌡️ >1000 daily high temperature records
🌡️ Warmest October thru December by far
🌡️ 4th-warmest year
Read more in our monthly summary: climate.colostate.edu/monthly_summ...
January 13, 2026 at 11:40 PM
Exceptional. Record-smashing. Disturbingly warm. December 2025 was one for the record books in Colorado.
🌡️ Warmest December
🌡️ >1000 daily high temperature records
🌡️ Warmest October thru December by far
🌡️ 4th-warmest year
Read more in our monthly summary: climate.colostate.edu/monthly_summ...
🌡️ Warmest December
🌡️ >1000 daily high temperature records
🌡️ Warmest October thru December by far
🌡️ 4th-warmest year
Read more in our monthly summary: climate.colostate.edu/monthly_summ...
Reposted by Keah
NOAA NCEI Just announced the US was in the bottom third of precipitation (ranked 40th driest out of 131 years).
But given the "regional" nature of precipitation, Here's daily departures (defined as % of 1991-2020 climatology) aggregated throughout 2025.
#StateOfClimate
But given the "regional" nature of precipitation, Here's daily departures (defined as % of 1991-2020 climatology) aggregated throughout 2025.
#StateOfClimate
January 13, 2026 at 5:04 PM
NOAA NCEI Just announced the US was in the bottom third of precipitation (ranked 40th driest out of 131 years).
But given the "regional" nature of precipitation, Here's daily departures (defined as % of 1991-2020 climatology) aggregated throughout 2025.
#StateOfClimate
But given the "regional" nature of precipitation, Here's daily departures (defined as % of 1991-2020 climatology) aggregated throughout 2025.
#StateOfClimate
Reposted by Keah
Welp, it's officially Colorado's worst season-to-date snowpack on record. Just a smidge below 1990, 2000, 2013, 2018 levels.
Records only date to 1987, but still worst snowpack in ~40 years of data with little relief in sight = no bueno.
#COwx
Records only date to 1987, but still worst snowpack in ~40 years of data with little relief in sight = no bueno.
#COwx
January 13, 2026 at 5:51 PM
Welp, it's officially Colorado's worst season-to-date snowpack on record. Just a smidge below 1990, 2000, 2013, 2018 levels.
Records only date to 1987, but still worst snowpack in ~40 years of data with little relief in sight = no bueno.
#COwx
Records only date to 1987, but still worst snowpack in ~40 years of data with little relief in sight = no bueno.
#COwx
Reposted by Keah
Is damaging hail getting worse? An ESSL-led study published in Nature Geoscience finds that very large hail is modelled to occur most frequently in South America, the United States, and South Africa, but Europe shows the strongest increase in very large hail frequency. doi.org/10.1038/s415...
January 12, 2026 at 1:30 PM
Is damaging hail getting worse? An ESSL-led study published in Nature Geoscience finds that very large hail is modelled to occur most frequently in South America, the United States, and South Africa, but Europe shows the strongest increase in very large hail frequency. doi.org/10.1038/s415...
Reposted by Keah
There were 23 billion-dollar weather and climate disasters in the US in 2025.
And we only know this because @climatecentral.org hired the NOAA employee who led this vital tracking effort, which was decommissioned by the administration last spring.
And we only know this because @climatecentral.org hired the NOAA employee who led this vital tracking effort, which was decommissioned by the administration last spring.
Just in - "According to @climatecentral.org, 2025 ranks as the third-highest year (after 2023 and 2024) for billion-dollar weather and climate disasters..."
+ Interactive graphics/data: www.climatecentral.org/climate-serv...
+ Climate Matters article: www.climatecentral.org/climate-matt...
+ Interactive graphics/data: www.climatecentral.org/climate-serv...
+ Climate Matters article: www.climatecentral.org/climate-matt...
January 8, 2026 at 5:30 PM
There were 23 billion-dollar weather and climate disasters in the US in 2025.
And we only know this because @climatecentral.org hired the NOAA employee who led this vital tracking effort, which was decommissioned by the administration last spring.
And we only know this because @climatecentral.org hired the NOAA employee who led this vital tracking effort, which was decommissioned by the administration last spring.
Reposted by Keah
For 2025, the Contiguous U.S. was about 1.5F above normal. Each of the last 10 months were above normal.
January 8, 2026 at 4:15 PM
For 2025, the Contiguous U.S. was about 1.5F above normal. Each of the last 10 months were above normal.
"Explaining the new album, Isakov said, "To me, the idea of a weatherman is really powerful. There's a guy on television or on the radio telling us the future, and nobody cares. It's this daily mundane miracle, and I think the songs I chose are about noticing the beauty in normal, everyday life.""
January 7, 2026 at 11:00 PM
"Explaining the new album, Isakov said, "To me, the idea of a weatherman is really powerful. There's a guy on television or on the radio telling us the future, and nobody cares. It's this daily mundane miracle, and I think the songs I chose are about noticing the beauty in normal, everyday life.""
Reposted by Keah
A comparison between recent satellite-derived sea ice observations and a reconstruction of ice extent since 1850 for the month of December. 2025 was a record low.
Data from @nsidc.bsky.social at doi.org/10.7265/jj4s...
Data from @nsidc.bsky.social at doi.org/10.7265/jj4s...
January 7, 2026 at 11:41 AM
A comparison between recent satellite-derived sea ice observations and a reconstruction of ice extent since 1850 for the month of December. 2025 was a record low.
Data from @nsidc.bsky.social at doi.org/10.7265/jj4s...
Data from @nsidc.bsky.social at doi.org/10.7265/jj4s...
Reposted by Keah
The first week of the new year is already flying by. Here's a look at how temperatures have changed around our planet over the last four decades in January...
Data from doi.org/10.24381/cds...
Data from doi.org/10.24381/cds...
January 6, 2026 at 11:13 PM
The first week of the new year is already flying by. Here's a look at how temperatures have changed around our planet over the last four decades in January...
Data from doi.org/10.24381/cds...
Data from doi.org/10.24381/cds...
Looking forward to actually sleeping tonight after one of the most persistently howling night wind storms in memory at my current house. Shout out to the firefighters who put out both fires yesterday before this kicked into full gear, one just two miles directly to my west. #cowx
January 6, 2026 at 11:42 PM
Looking forward to actually sleeping tonight after one of the most persistently howling night wind storms in memory at my current house. Shout out to the firefighters who put out both fires yesterday before this kicked into full gear, one just two miles directly to my west. #cowx
Reposted by Keah
2025 goes down as the ~3rd-warmest year on record (based on ERA5).
Like in 2024, every single day this past year was warmer than the average of even the most recent reference period (1991-2020).
Like in 2024, every single day this past year was warmer than the average of even the most recent reference period (1991-2020).
January 4, 2026 at 5:38 PM
2025 goes down as the ~3rd-warmest year on record (based on ERA5).
Like in 2024, every single day this past year was warmer than the average of even the most recent reference period (1991-2020).
Like in 2024, every single day this past year was warmer than the average of even the most recent reference period (1991-2020).
Reposted by Keah
Reposted by Keah
Wisconsin has a new 24-hour precipitation record: 14.55"
This was recorded by a rain gauge in Milwaukee during the August flooding event and shatters the previous record of 11.72" that was measured on June 24, 1946.
www.weather.gov/mkx/NewWisco...
This was recorded by a rain gauge in Milwaukee during the August flooding event and shatters the previous record of 11.72" that was measured on June 24, 1946.
www.weather.gov/mkx/NewWisco...
New Wisconsin State Precipitation Record
www.weather.gov
December 19, 2025 at 3:19 PM
Wisconsin has a new 24-hour precipitation record: 14.55"
This was recorded by a rain gauge in Milwaukee during the August flooding event and shatters the previous record of 11.72" that was measured on June 24, 1946.
www.weather.gov/mkx/NewWisco...
This was recorded by a rain gauge in Milwaukee during the August flooding event and shatters the previous record of 11.72" that was measured on June 24, 1946.
www.weather.gov/mkx/NewWisco...
Reposted by Keah
Scientists are supposed to be happy when their predictions are skillful, right?
Why do I not feel happy?
Why do I not feel happy?
December 19, 2025 at 2:10 PM
Scientists are supposed to be happy when their predictions are skillful, right?
Why do I not feel happy?
Why do I not feel happy?
Reposted by Keah
This entire train got blown over this morning northwest of Cheyenne
December 19, 2025 at 5:49 PM
This entire train got blown over this morning northwest of Cheyenne
Reposted by Keah
This tree just came down on Pine St just west of Folsom St in Boulder. Winds already gusting to 100+ mph at NCAR Mesa Lab.
December 19, 2025 at 7:19 PM
This tree just came down on Pine St just west of Folsom St in Boulder. Winds already gusting to 100+ mph at NCAR Mesa Lab.
Reposted by Keah
Extreme winds were observed across eastern Colorado yesterday, with numerous wildfires growing quickly in Yuma County last night. The strongest winds were in the foothills, with several reports of gusts over 100mph. But the >80mph gusts on the eastern plains are perhaps even more unusual. #cowx
December 18, 2025 at 4:51 PM
Extreme winds were observed across eastern Colorado yesterday, with numerous wildfires growing quickly in Yuma County last night. The strongest winds were in the foothills, with several reports of gusts over 100mph. But the >80mph gusts on the eastern plains are perhaps even more unusual. #cowx
Reposted by Keah
The latest numbers: We are at about 60,000 without power statewide, 19,000 in #Boulder County. Another shutdown on Friday is still possible: www.axios.com/local/boulde...
60K Colorado customers remain without power amid high winds
Xcel says outages could last through the weekend.
www.axios.com
December 18, 2025 at 6:58 PM
The latest numbers: We are at about 60,000 without power statewide, 19,000 in #Boulder County. Another shutdown on Friday is still possible: www.axios.com/local/boulde...
Reposted by Keah
Reposted by Keah
A powerful storm will shift from the Upper Midwest to eastern Canada through Friday with areas of snow/localized blizzard conditions, high winds, and gusty showers and thunderstorms. An atmospheric river will impact Oregon and northern California Thursday and Friday with heavy to excessive rain.
December 18, 2025 at 1:29 AM
A powerful storm will shift from the Upper Midwest to eastern Canada through Friday with areas of snow/localized blizzard conditions, high winds, and gusty showers and thunderstorms. An atmospheric river will impact Oregon and northern California Thursday and Friday with heavy to excessive rain.
Reposted by Keah
One of the important differences on the Front Range between December 2021 and today is the dryness that allowed for the Marshall Fire to take off. 30-day SPEI was extreme in 2021, while snow 2 weeks ago left fuels in a less receptive state. PSPS and lessons learned in 2021 likely helping out too.
December 17, 2025 at 11:22 PM
One of the important differences on the Front Range between December 2021 and today is the dryness that allowed for the Marshall Fire to take off. 30-day SPEI was extreme in 2021, while snow 2 weeks ago left fuels in a less receptive state. PSPS and lessons learned in 2021 likely helping out too.
Reposted by Keah
December 17, 2025 at 10:52 PM