Windspeed

Big mid-to-upper level airflow make lower level air lift go boom!

Filling in nicely in the northern and upper NE Valley as well. Flow is backing and becoming more northwesterly. I think KTRI may do quite well over the next 4-6 hours.

https://forecast.weather.gov/showsigwx.php?warnzone=TNZ040&warncounty=TNC029&firewxzone=TNZ040&local_place1=3%20Miles%20SE%20Lowland%20TN&product1=Winter+Storm+Warning&lat=36.1242&lon=-83.1732

There is a modeled snow hole over upper NE Holston Valley for a reason, which is likely due to some downslopping with the 850 flow *IF* the SLP cuts across the Southern Apps. Notable with the adjacent to high ridges of Unaka in Greene and Washington Counties, and Sullivan with Holston Mountain. I'm thinking it may very well stump totals versus the western NE TN counties, but I don't forsee graupel or sleet taking over due to warm nose. It should remain cold enough for snow, just weaker overall totals. That being said, if the SLP remains further south, upper NE Tennessee and KTRI may exceed 3-5". But if we land in the middle ground and end up with 4 inches, I am proclaiming this a big win, all things considered. Someone is likely to still get hammered, and I feel like portions of SW VA, such as Gate City to Abingdon, are being under modeled. It would not surprise me to see those places end up with 6-8 inches of powder. Also, I know we post the Icon but take it far less seriously than the GFS, ECMWF and Euro suites, but it is interesting it keeps wanting to pump higher totals over the upper NE Holston watershed this late in the game.

ETN needs the cold surface and 850 hPa airmass to hold in place and cooperate. We're in the 120 hr range now. We may still get a warm nose, but I am hopeful the upper Holston Valley will remain cold enough. If rates are weak with low QPF, we probably lose. If rates can pump up the column, we win. Therefore, the 10-11 system may come down to the wire before we know the cutoff of the graupel vs heavy snow line. Going to require a little patience until it plays out. Curbing my expectations and perhaps the Eastern Valley gets a surprise.

Chido's first landfall from the Island of Mayotte a few days ago. It appears to have been an intense landfall there as well. Community of Kaweni: Unsure of the exact location in the island here:

Yeah, someone got hit hard. A rapidly intensifying landfall per ADT analysis. Hopefully, it avoided a major population center. That looks to be the case as the small core came ashore a good distance south of the port city of Pemba.

Chido's organization has improved in the hours leading up to landfall. Looks like at least a Category 3 strike.

Tricky forecast. A mere few hundred miles on stall position is the difference between a major hurricane or a weak TS. I was bullish. But look at the upper pattern and environment. It's very explosive. We just got lucky on proximity of the COC tracking into the Honduras coastline. It could still become a hurricane after all if it manages to not push fully inland on this stall.

Looks like the low-level circulation is going to push down into Honduras. That's a huge break for the Yucatán as far as a more intense hurricane developing. Still, a prolific heavy rain and flood problem for Honduras and Nicaragua.

I'm bullish on this TC. This could be an intense hit on Yucatán or Western Cuba if it doesn't stay in the Straits. As for Florida, though SSTs are a tick AN, they're still down around ~26°C west of the Peninsula. I imagine a strong TC will begin to lose some punch tracking NE across the Eastern GOM. Obviously, a further south track keeps the TC over 27-28°C SSTs, especially around the Keys. But that likely includes land interaction with Cuba, so hopefully still a weaker solution. As far as atmospheric setup when this future TC would hook into the westerlies, though there would be increasing shear values north of the Straits, the mid-level steering flow may align with upper SW flow, so the TC would likely still be in a favorable environment and ventilated / divergent pattern, even if SSTs are decreasing as the system moves NE. Still a long way to go to iron out specifics as far as a Florida hit or miss, but it's becoming increasingly probable that a hurricane forms and makes landfall early next week somewhere in the NW Caribbean and/or Eastern GOM. Given the environment, the initial landfall will most likely be an intense one. Not to prey on the Yucatán, but obviously Florida would benefit if a landfall occurs there first.

The operationals were pretty eye-opening last night. Even the ECMWF bombed a 930 mb major. I guess we'll just have to see how fast this system consolidates over the next 48 hours. There is a 24 hour variance between TCG between the two major operationals. The lesser deterministic GEFS still prefers land interaction slowing down any rapid intensification. Obviously, we don't even have an invest labeled yet, but it just goes to show how favorable the environment will become for the potential TC if it does form and stays over water.

The signal continues to ramp up on ensemble suites. Likewise, the 00z GFS rolling in has a hurricane inside three days. This is all likely due to the notable lower surface pressures south of Hispaniola, broad mid-level vorticity along the wave axis, and a robust convective envelope. If the hypothetical TC manages to avoid prolonged land interaction with NE Nicaragua and/or Honduras, this system could become quite strong given the favorable upper environment that should be in place. Any system hanging around the deep WCARIB should be well-ventilated.

Immediate surface is running a tick above 28°C. Enough to support a major hurricane.