Allie Mazurek

Graphic showing the spring leaf index anomaly for March 3, 2026 for the contiguous United States, with spread arriving very early in central and western areas and late in the southeast.

It's been so warm for cities like Denver, Colorado that even phenological spring has arrived there according to the first leaf out! Wow!

Graphic from @usa-npn.bsky.social: www.usanpn.org/data/maps/sp...

👀 new storm events database site at @noaa.gov , and it's not terrible!

Go check out the beta site and break it!

www.ncei.noaa.gov/access/storm...

graph showing the number of days in December through February with temperatures of 60F or above at Fort Collins, Colorado. This year had 43 which is almost double the previous high of 22.

graph showing the number of days in December through February with daily low above 32F at Fort Collins, Colorado. This year had 19 which is almost double the previous high of 10.

A couple of the wildest graphs I recall making. It's been #warm... at Fort Collins the warmest climatological winter by nearly 4°F! #cowx 🌡️

Fort Collins number of days with TMAX >= 60°F, December through February. "Fort Collins has recorded 38 60°F days this winter. Previous high was 22 (1980-81). The remaining days in the month are all forecast to be 60 or above (five more).

@rschumacher.cloud on a state call this morning, talking about the crazy warmth we've been experiencing. The number of days Fort Collins has passed 60°F this winter, far surpasses any other winter!

A Response to the Decision to Rescind EPA's 2009 Endangerment Finding The AMS is a global community committed to advancing weather, water, and climate science and service.

AMS is deeply concerned by the repeal of EPA’s 2009 Endangerment Finding, which concluded greenhouse gas emissions harm health and well-being. The science remains clear: human-caused climate change is already causing harmful impacts.

Read the full statement: https://bit.ly/4tBwz9w

How does this year compare to the snow droughts of the past? - Colorado Climate Blog Colorado’s mountain snowpack is in bad shape this year. It’s been extremely warm, and snowstorms have been few and far between. Based on data from the SNOTEL network, the amount of water stored in the...

The mountain snowpack so far this winter is in bad shape. Long-time Coloradans might remember two other terrible winters for snow: 1976-77 and 1980-81. Our latest blog post takes a look at how this year compares to those snow droughts of the past. #cowx

Wondering about this mild winter? Third-graders get the answers from a meteorologist. A few fun facts about the rest of the snowy season:  This winter, we’re likely to get less snow than last year.  Last December was the warmest of

I had a fun opportunity to chat with some very bright 3rd graders through this collaboration with CPR! The kids managed to stump me on one question :)

Share your science with your communities ❤️👩‍🔬

Taking off my weather hat for a moment for something more important than the forecast…today is International Holocaust Remembrance Day.

I’ve shared before that my grandparents (mom’s side) are both Holocaust survivors. Please do me a favor and read their story in this thread.

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...

Since SPC isn’t on BlueSky yet, I’ll share these fun “Wrapped”-style graphics here. Here’s a look back at SPC product issuances in 2025. Stay tuned for a more thorough review of the severe storm season coming in the new year.

Current radar snapshot with warnings depicted.

Tornado Warning inside a Severe Thunderstorm Warning inside a Flash Flood Warning in LA County at the moment, if you're wondering how things are going... #CAwx #LArain

This was very fun to work on, emerging from student class projects a few years ago. How sharp can a cold front get? We were able to point to some answers.

Very strong winds and extremely dry conditions are expected across the Front Range tomorrow (Dec. 19). Critical fire weather conditions will be in place, with the greatest risk over parts of Boulder and Jefferson counties.

Key messages below from NWS Boulder. Stay safe and weather aware! #cowx

Map of maximum wind gusts from the ASOS, CoAgMET, and Northern Water networks on 17-18 December 2025.

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

Before the 1990s, plane crashes caused by microbursts used to kill planeloads of people fairly regularly.

Dr. Ted Fujita and NCAR scientists figured out how to detect microbursts and warn pilots about them.

Since then? Zero airliner crashes from microbursts.

Trump moves to dismantle major US climate research center in Colorado The Trump administration is breaking up the National Center for Atmospheric Research, taking aim at one of the world's leading climate research labs.

Exclusive: The Trump administration is moving to dismantle the National Center for Atmospheric Research in Colorado, according to a senior White House official, taking aim at one of the world's leading climate research labs.

Cover page of the November 2025 Colorado Monthly Climate Summary. It shows the extremes around the state, and that it was the 3rd-warmest and 42nd-driest November out of 131 years of records.

November was the 3rd-warmest on record for Colorado: 7.5°F above the 20th century average for the month. And much of the state was dry, with little snow in either the mountains or at lower elevations.

Read more in our November monthly climate summary: climate.colostate.edu/monthly_summ... #cowx

Sunrise over a weather station and buildings

🌞 #cowx

Adorable! 😻

Any teachers out there? Ramping this back up again and figured I would advertise.

I am on the National Weather Service National School Outreach Team. We are composed of various NWS meteorologists across the country that give school talks about the weather. We can use just about any online platform.

Front page of the October 2025 Colorado Monthly Climate Summary, with a map of the monthly extremes and notable events. It was the 10th warmest and 46th wettest October.

If all this warm and dry November weather has you thinking back to October when there was quite a bit more happening, our monthly summary is for you. Including the big southwest rainstorm and flood, a lack of mountain snow, and more warmth on the Plains:
climate.colostate.edu/monthly_summ... #cowx

Dark pink aurora with tree silhouettes

Pink and purple aurora with a white light like cartoon god coming down??

A white and dark pink corona

Pink and purple aurora, a faint cloud, trees

#alaskasky from Denali, 64°N, never seen so much pink and red

Red and green aurora over Boulder city lights.

More aurora

More aurora

More aurora

The world would be a better place if we all spent more time looking at cool stuff in the sky.

Despite being sick with COVID (again) I couldn't miss this magical evening with my old friend, Lady Aurora

Aurora

Losing my mind !!!

Aurora

Fort Collins!!!! #cowx

Water Year 2025 was the 10th warmest on record for Colorado and featured drought, fires, floods, and even a record-setting snowstorm. We recap all that and more in our Colorado Water Year 2025 Summary! ⬇️

Convective Mode Classification and Distribution of Contiguous United States Tornado Events from 2003–2023 Abstract Tornadoes and severe thunderstorms represent a significant threat to life and property in the United States annually. Approximately one thousand tornadoes, two-hundred being significant (F/EF-2+), are documented on average every year. Using archived radar and Storm Data storm report information, 21 912 tornado grid hours were manually analyzed for convective mode from the years 2003–2023. This dataset builds upon prior work by Smith et al. (2012) (hereafter S12) by more than doubling the sample size to produce a robust, multidecadal climatology of tornadoes by convective mode. Comparisons were made between tornado samples spanning 2003–2011 and 2012–2023 to assess changes in the frequency and spatial occurrence of tornadoes. Convective mode characterization consisted of a subjective analysis of WSR-88D imagery into three categories: 1) supercell, 2) quasi–linear convective system (QLCS), and 3) disorganized. Spatial climatologies of the different modes were performed and Kernel Density Estimate plots of events per decade were generated as in S12. The highest climatological frequency for tornadic supercells is reaffirmed to extend from KS and OK east-southeastward to MS and AL, while QLCS tornadoes are more frequent from the northern Gulf Coast states into the lower Ohio River Valley. Comparing the new sample to the original, QLCS tornado relative frequency increased by over 100%. Substantial variation in QLCS tornado occurrence may be due to non-meteorological factors such as dual polarization radar and different observing/reporting practices.

I was going to wait until the shutdown was over but the cat is out if the bag. My first journal article is now live!

Convective Mode Classification and Distribution of Contiguous United States Tornado Events from 2003–2023 in: Weather and Forecasting - Ahead of print share.google/M3ty4pVs5Tld...

Alrighty, ready to see something really cool? (and maybe a little nauseating)

The evolution of Hurricane Melissa's mesovortices at peak strength.

A lightning-packed eye spins ferociously at the center of Hurricane Melissa.