Alex Boreham
@cyclonicwx.bsky.social
Tropical meteorologist, B.S. FSU, amateur web, Python, & GrADS programmer.
Also known as Not Sparta
Also known as Not Sparta
January's WWBs have taken effect in the subsurface. The warm pool at the dateline is becoming stronger as another downwelling Kelvin Wave loads up. Will give us another push towards El Niño
February 3, 2026 at 7:31 PM
January's WWBs have taken effect in the subsurface. The warm pool at the dateline is becoming stronger as another downwelling Kelvin Wave loads up. Will give us another push towards El Niño
I've added some new models to the lineup! The AI GFS and the Canadian suite (GEM/GEPS ensembles) are now available, you can see just about any solution from the major global models! Long time coming
February 2, 2026 at 9:11 PM
I've added some new models to the lineup! The AI GFS and the Canadian suite (GEM/GEPS ensembles) are now available, you can see just about any solution from the major global models! Long time coming
A tale of two extremes in the CONUS today. Numerous and widespread daily/monthly record lows fell last night with the impressively cold airmass in the SE. At the same time, Western ridging means some areas there have broken daily temperature records. Very uneven pattern!
February 1, 2026 at 10:53 PM
A tale of two extremes in the CONUS today. Numerous and widespread daily/monthly record lows fell last night with the impressively cold airmass in the SE. At the same time, Western ridging means some areas there have broken daily temperature records. Very uneven pattern!
Once again, there is snow in Florida. A bit of moisture from the snowstorm in the Carolinas has made its way to the Florida panhandle, where it is cold enough to snow. Have seen numerous reports of snow out of Tallahassee. That's how you know this cold blast is the real deal!
January 31, 2026 at 7:19 PM
Once again, there is snow in Florida. A bit of moisture from the snowstorm in the Carolinas has made its way to the Florida panhandle, where it is cold enough to snow. Have seen numerous reports of snow out of Tallahassee. That's how you know this cold blast is the real deal!
As the coastal low develops, it will bring a very cold Arctic airmass south into Florida. This will lead to freezes in much of the state during the weekend in the state's biggest cold snap since 2010. < -10C at 850mb is about as low as it ever gets in Central Florida!
January 31, 2026 at 2:48 AM
As the coastal low develops, it will bring a very cold Arctic airmass south into Florida. This will lead to freezes in much of the state during the weekend in the state's biggest cold snap since 2010. < -10C at 850mb is about as low as it ever gets in Central Florida!
With the winter storm's squall line entering the area of CAD, a large portion of it has turned into sleet and freezing rain. You certainly don't see that every day!
January 25, 2026 at 11:16 PM
With the winter storm's squall line entering the area of CAD, a large portion of it has turned into sleet and freezing rain. You certainly don't see that every day!
I've added the HRRR model to my site as well, as the winter storm ramps up. Good tool to have when short-term changes dominate
January 24, 2026 at 4:43 PM
I've added the HRRR model to my site as well, as the winter storm ramps up. Good tool to have when short-term changes dominate
The winter storm that has been talked about all week has begun producing widespread wintry precipitation over the Southern Plains. It will become far more expansive during the weekend and reach all the way to the East Coast. Stay safe and stay inside if you can during the storm!
January 24, 2026 at 1:28 AM
The winter storm that has been talked about all week has begun producing widespread wintry precipitation over the Southern Plains. It will become far more expansive during the weekend and reach all the way to the East Coast. Stay safe and stay inside if you can during the storm!
I've added the AIFS model from ECMWF. A popular request! It's nice to have the capabilities to add all these new models now
January 23, 2026 at 1:45 AM
I've added the AIFS model from ECMWF. A popular request! It's nice to have the capabilities to add all these new models now
With a low off Baja California, we'll see a strong jet streak draped across the southern US to begin the weekend, bringing tropical Pacific moisture into the country. At the same time we will have a strong Arctic high pressure bringing cold air into the south.
January 21, 2026 at 4:42 AM
With a low off Baja California, we'll see a strong jet streak draped across the southern US to begin the weekend, bringing tropical Pacific moisture into the country. At the same time we will have a strong Arctic high pressure bringing cold air into the south.
The eastern equatorial Pacific is warming rapidly as the subsurface warm pool begins to surface. With the current downwelling Kelvin Wave and continuing WWB activity, the Pacific looks to take solid steps toward the emergence El Nino in the coming weeks
January 19, 2026 at 4:34 AM
The eastern equatorial Pacific is warming rapidly as the subsurface warm pool begins to surface. With the current downwelling Kelvin Wave and continuing WWB activity, the Pacific looks to take solid steps toward the emergence El Nino in the coming weeks
Some snow in the Deep South today, even into the Florida panhandle as the frontal system passes by and causes another cold outbreak. Not nearly as impressive as the winter storm a year ago but always neat to see snow reaching this far south!
January 18, 2026 at 3:59 PM
Some snow in the Deep South today, even into the Florida panhandle as the frontal system passes by and causes another cold outbreak. Not nearly as impressive as the winter storm a year ago but always neat to see snow reaching this far south!
Big addition: I've added the HAFS models to the lineup! Hurricane models have been sorely missing for a while, but now you can get a closer look at any storm the models run on including parameters you don't see on global models like simulated microwave imagery!
January 14, 2026 at 1:25 AM
Big addition: I've added the HAFS models to the lineup! Hurricane models have been sorely missing for a while, but now you can get a closer look at any storm the models run on including parameters you don't see on global models like simulated microwave imagery!
On top of increasing shear, another factor leading to #Dudzai's weakening is its meandering. It's been over the same area (and strong) long enough to create a noticeable cold wake. This eliminates latent heat flux nearby and makes it difficult to produce convection or fight shear
January 13, 2026 at 4:55 AM
On top of increasing shear, another factor leading to #Dudzai's weakening is its meandering. It's been over the same area (and strong) long enough to create a noticeable cold wake. This eliminates latent heat flux nearby and makes it difficult to produce convection or fight shear
With a powerful cold front coming through the country, we can see this on the hourly pressure changes from METAR stations. Very easy to see the rising pressure as the front passes! About to be very cold for a lot of people
December 30, 2025 at 2:50 AM
With a powerful cold front coming through the country, we can see this on the hourly pressure changes from METAR stations. Very easy to see the rising pressure as the front passes! About to be very cold for a lot of people
Thanks in part to the very generous donations this year, cyclonicwx.com has been upgraded to a new server! It is far more powerful than the last. I have kicked off this upgrade with new true color satellite imagery! And there is way more on the way! Very excited to see what I can do this winter
December 26, 2025 at 12:07 AM
Thanks in part to the very generous donations this year, cyclonicwx.com has been upgraded to a new server! It is far more powerful than the last. I have kicked off this upgrade with new true color satellite imagery! And there is way more on the way! Very excited to see what I can do this winter
With this system pulling to the east, the northerly flow behind is producing a lot of lake effect snow off Lakes Michigan and Huron. Getting to that time of year!
November 10, 2025 at 3:20 AM
With this system pulling to the east, the northerly flow behind is producing a lot of lake effect snow off Lakes Michigan and Huron. Getting to that time of year!
#FungWong has turned out to be a very large typhoon with quite the broad core. This means previous guidance suggestions of a very strong storm did not come to pass, but it also means a larger region impacted as it comes ashore. Stay safe if you are in the path!
November 8, 2025 at 5:34 AM
#FungWong has turned out to be a very large typhoon with quite the broad core. This means previous guidance suggestions of a very strong storm did not come to pass, but it also means a larger region impacted as it comes ashore. Stay safe if you are in the path!
#TD32W has become a large, sprawling tropical cyclone with lower shear and impressive upper divergence. Will be interesting to see the size of the inner core that forms from this. If on the smaller side, will lean towards stronger solutions. Something to keep an eye on this weekend in Luzon
November 5, 2025 at 10:22 PM
#TD32W has become a large, sprawling tropical cyclone with lower shear and impressive upper divergence. Will be interesting to see the size of the inner core that forms from this. If on the smaller side, will lean towards stronger solutions. Something to keep an eye on this weekend in Luzon
#90W is trying to get itself together with an LLC in a broader area of rotation. Some decent upper divergence right now, but it is sheared. The environment will get even more divergent and shear should drop tomorrow. Some guidance has been quite aggressive, we'll see how it fares
November 4, 2025 at 4:00 AM
#90W is trying to get itself together with an LLC in a broader area of rotation. Some decent upper divergence right now, but it is sheared. The environment will get even more divergent and shear should drop tomorrow. Some guidance has been quite aggressive, we'll see how it fares
As it was when it developed, #Melissa is once again sheared. Its MLC is becoming displaced from its LLC, and if you get far enough up, it's much harder to see a TC signature and it turns into a trough in the middle of the jet stream flow. Lots of neat stuff on TDR data!
October 30, 2025 at 9:03 PM
As it was when it developed, #Melissa is once again sheared. Its MLC is becoming displaced from its LLC, and if you get far enough up, it's much harder to see a TC signature and it turns into a trough in the middle of the jet stream flow. Lots of neat stuff on TDR data!
I've added radar data from Taiwan to the lineup. Between this and JMA radar, there's nice coverage in this part of West Pacific to see typhoon structures!
October 30, 2025 at 8:05 PM
I've added radar data from Taiwan to the lineup. Between this and JMA radar, there's nice coverage in this part of West Pacific to see typhoon structures!
#Melissa continues NE tonight, weakened again from land interaction with Cuba. There is some upper divergence which could cause some strengthening as it approaches Bermuda, but the disrupted structure means it won't be significant before shear increases and SST drops below 26C
October 30, 2025 at 3:13 AM
#Melissa continues NE tonight, weakened again from land interaction with Cuba. There is some upper divergence which could cause some strengthening as it approaches Bermuda, but the disrupted structure means it won't be significant before shear increases and SST drops below 26C
#Melissa is much weaker as expected coming off of Jamaica. However, with some time over water and the improved satellite presentation, there will likely be increased winds from what recon is finding. Luckily for Cuba, Melissa will not be able to intensify as strongly as before due to the disruption
October 28, 2025 at 11:55 PM
#Melissa is much weaker as expected coming off of Jamaica. However, with some time over water and the improved satellite presentation, there will likely be increased winds from what recon is finding. Luckily for Cuba, Melissa will not be able to intensify as strongly as before due to the disruption
Insane dropsonde from #Melissa's southern eyewall. Stronger than the one yesterday morning, strongest I can remember seeing. Agrees with 160kt intensity from NHC
October 28, 2025 at 2:15 PM
Insane dropsonde from #Melissa's southern eyewall. Stronger than the one yesterday morning, strongest I can remember seeing. Agrees with 160kt intensity from NHC