One of the wildest 24-hour loops you'll see in the Mid Atlantic - from mid-upper 80s and tornado warnings to 33F and heavy snow
On the left: 4pm today, with 85-90 degrees across Virginia into Washington DC
On the right: 4pm tomorrow, with widespread snow across Virginia into Washington DC
Going straight from summer to winter in just 24 hours
Localized onshore SE flow doing its thing. Microscale forecast bust in parts of NYC and NE NJ stuck in the 50s and low 60s while the rest of the area surges well into the 70s
Just your typical elevated hailstorm moving into Chicago where it’s 39F at the surface but with >1000 J/kg MUCAPE
NYC surged to a high of 69 today, marking the first time Central Park reached the 60s since *November 9, 2025*.
This ends a remarkable stretch of 118 consecutive days below 60F, the longest such stretch since 1981-82 with 122 consecutive days below 60F.
Neat GIF of the evening — the last 2 months had a time mean trough in the East & ridge in the West. As you go up in height into the stratosphere, the wavenumber decreases but a time mean trough lingers over the East as the vortex tilts with height while remaining elongated.
A very careful attempt at a neutral analysis of an ongoing conflict:
In any conflict, especially during wars, it is surprisingly easy for bad information to spread. Fake AI videos/photos are clear examples - these can usually be spotted but require effort to pick apart small details. But...
There is far too much bad information out there to tackle it all, so I'll leave it at this - next time you see a video or photo purporting to show something happening, or a report from an account you're not very familiar with claiming something, be careful of immediately taking it at face value.
...to a real picture or video from an ongoing conflict, but with the context around it distorted - easy to do for a single snapshot or a short video where the viewer doesn't know what happened before or after the camera stopped rolling.
These can be intentional, or they can be good faith mistakes.
...but arguably just as, if not more dangerous, are more subtle forms of bad information.
This can be anything from a real video from a past war or totally different location attributed to this one (e.g., 2023 Turkey earthquake aftermath presented as the aftermath of a missile from this week)...
...traditional propaganda & disinformation are also spreading rampantly, especially from accounts or people whose motive is to promote one side at the expense of the other regardless of whether their motives are publicly known or not.
These are the most clear-cut examples of bad info spreading...
A very careful attempt at a neutral analysis of an ongoing conflict:
In any conflict, especially during wars, it is surprisingly easy for bad information to spread. Fake AI videos/photos are clear examples - these can usually be spotted but require effort to pick apart small details. But...
Given that model soundings show the warm layer aloft only marginally passes freezing, heavier and more sustained precipitation should lead to mixing with or a changeover to snow in NE PA & north NJ in the next 1-2 hours.
There seems to be a short-term precipitation type bust underway — mPING reports suggest the precipitation overspreading north NJ & NE PA is falling as sleet, despite HRRR & NAM modeling a precip type of snow.
Now that more observations have arrived, here's my updated hand-drawn contour analysis for snow accumulation from this week's blizzard:
The failure was the placement. The cyclone was slightly east & more positively tilted than CAMs modeled and I expected, shifting the deformation band east into E NJ & NYC. Since a sharp gradient was expected west of this band, the east shift meant much lower totals than expected near the gradient.
At a glance, the success was the general structure of snow bands - SSW-NNE deformation band from DE-NJ, weak subsidence axis in between that & heavier banding to its east, secondary intense band in SE New England.
Keeping in mind the map on the right is only a preliminary verification analysis (made while the storm was ongoing in parts of New England), I wanted to start with a quick verification of my forecast map - I'll write up a more detailed review when I have some time later this week.
Thanks Sam! Definitely pleased with how I resolved the individual features & bands in the forecast, but could've done better with the placement as I weighted too heavily on the CAMs when global models (and the RGEM) were correctly farther east with the cyclone.
Using all public storm reports from the NWS so far, I contoured a preliminary estimated snow accumulation map for today's blizzard (through 6-8pm EST tonight).
Truly a historic storm - both in terms of impacts, and the forecast challenges leading up to it.
With approximately 13” recorded in 5 hours, Providence, RI got about as much snow in 5 hours as Denver received all winter to date
4⃣ Tomorrow -- As the occluded cyclone moves off to the northeast, forcing for ascent becomes increasingly disjointed from the cyclone center. Strong low-mid level warm air advection pushing through RI & E MA leads to snow rates over 2-4"/hour, but without the pivoting snow bands expected out west.
...producing heavy snow bands in excess of 2-4"/hour moving from SE to NW through the NYC metro and merging into the dominant pivoting snow band, now likely over the western half of NJ. Thundersnow isn't out of the question with these convective bands.
3⃣ Late tonight -- As the cyclone & its associated low-level jet (LLJ) rapidly strengthen, the LLJ rotates towards the southeast, with strong offshore convection along the triple point of the cyclone rotating into the cold conveyor belt in an area of strong isentropic ascent...
2⃣ Tonight - As the surface low & upper-level trough become aligned & sfc cyclone rapidly deepens, the frontogenesis swath pivots to the SSW-NNE, with a slow-moving to near stationary snow band setting up from DE to S NJ & Philly. Heavy snow rates upwards of 2-3"/hour are expected with this band.
Detailed snow banding discussion:
1⃣ Short term -- An ongoing zonally oriented frontogenetic band associated with the mid-level warm front is slowly pushing north into DE & southern NJ, producing large aggregates and heavy wet snow. This band will continue slowly moving north & intensifying today.
Given these factors & assuming high-resolution models are better resolving the convective aspects of the cyclone development and its rapid deepening, I sided with the CAM suite which has the max snow swath extending west of the global model suite.
HRRR 10:1 ratio map was used as a starting point:
As of this afternoon, nearly all high-resolution models have converged on roughly the same cyclone location, amplitude, and frontogenesis evolution, with the NAM & HRRR having been far too amplified and northwest yesterday and correcting southeast since then.
❄️ FINAL FORECAST: BLIZZARD OF 2026 ❄️
Now that the snowstorm is underway, I went into a high level of detail trying to narrow down the snow band placement and evolution.
Forecast reasoning follows in the thread below:
NWS New York makes an excellent point in their discussion. Snow rates will start light tomorrow morning & above-freezing temps mean snow will accumulate little if at all for many.
Do not be fooled - this doesn't mean the forecast busted.
Conditions will steadily deteriorate into the evening.
