Newman

In most cases I wouldn't even think twice about the Euro AI showing a system developing in the Western Carribean at Day 11, but it is interesting to note that both the Google Deep Mind GenCast and regular Google Deep Mind ensemble are highlighting TC genesis in the same location and time, and then tracking into the Gulf. What are the AI models picking up on (or not) that the physics-based deterministic aren't?

And to note, even the NHC is using the Google DM in their official forecasts. It has done very well this season.

Quite the bust with this wave. The Euro AI did well on not biting on this one

A couple climate statistics for Allentown as we wrapped up August:

• The average temperature was 70.0F, the coolest August since 2008.
  • Likewise the average minimum was 58.3F, the lowest since 2008.
• The lowest minimum recorded was 45F, which is the lowest August min since 2000 (which tied with a min of 45). The next year that recorded a lower minimum in August is 1986!
• 1.6" of precip fell, which is the driest August since 2008.

Echoing what Andy said on twitter here, this has been my thinking with any tropical system development in the MDR this month:

https://x.com/AndyHazelton/status/1952439813619003854

We've had round after round of SAL outbreaks across the Atlantic the past month or two. It looks to relax a bit in this favorable stretch approaching, but I won't believe any model until we see a potent AEW with persistent convection. Also, beyond just a wave developing into a TC, I think the real key in the modeling is how they handle the weak ULL in the north Atlantic and if that allows for a weakness for a TC to slip north.

Current SAL situation:

12z GFS with the tropical wave and some lessening of the dry upper air regime. 

The WPC just issued a Moderate risk for flash flooding across the I-95 corridor tomorrow. The HRRR and NAM are both showing PWATs upwards of 2.2-2.5" and the front looks to be draped right across NW PA with plenty of moisture transport into the region

My brother in Lititz last night got smoked with nearly 6" of rain. More on the way today

Confirmed/observed tornado just 6-7 miles east of Laramie today, crazy storm. Went and picked up some golf balls once the storm passed. Probably 2-3 inches of accumulated hail in the hardest hit areas

16/7/3

Photos I took of the Akron, CO tornado yesterday. Edited slightly to make the tornado pop a bit more, the dust made the visibility super low!

Things look stormy and active from Wednesday through the weekend across the front range and plains. A pretty potent shortwave trough and -PNA will result in quite a few disturbances rotating through the region. The orientation and strength of the PNA will determine where the bulk of the precip goes and whether the front range gets in on a favorable moisture advection regime. Currently a marginal risk from the SPC for Wednesday

I'm not sure we even picked up 1 inch here in Laramie, under a WWA for 3-6"

16 minutes ago, MGorse said:

Peak gust at RDG was 62 mph.

Gotcha, was just going off the MesoWest site

https://mesowest.utah.edu/cgi-bin/droman/meso_base_dyn.cgi?stn=KRDG&unit=0&timetype=GMT

My folk in Fleetwood had a big tree go down in the backyard this afternoon. Looks like peak gust at KRDG was 57 mph this afternoon. More shallow convection moving through right now

From my folk just in Fleetwood... Over an inch of snow on cold surfaces this morning before things started to melt. Certainly didn't expect accumulating snow to get as far south as Berks, let alone over an inch 

12z Euro is pretty much bone dry for the next 10 days across the Lehigh Valley. GFS keeps temps in lower 50s while Euro gets into mid-upper 50s. Quite possible this final stretch of February gets some climate stations back closer to normal for the month after a cold start

To be honest, the coastal storm itself is probably long gone at this point for much of the SE PA region. The ULL snows though are very much a plausible possibility with a C-1"

Did the 12k NAM just give Philly like 8 inches? Lol. Even the 3k NAM, which skunks Philly, shifted quite a bit NW and gives ACY like 4-6. Don't believe it

Quite the h5 look, so close to something big but it'll probably be too little too late. If at this point the ULL/trough was neutral and not slightly positive, you'd be able to scoop up enough PVA to swing it into at least the Philly area. Some very intense curvature vorticity being advected towards the downstream flank of the trough, but that pesky confluence streak in northern Maine is helping to slow how quickly this turns neutral (as well as the fast flow in general). If a long range smoothed ensemble picked up on this exact h5 look, I'd be screaming KU too. But when it came down to it, we were about 12-18 hours off in timing.

23 minutes ago, Kevin Reilly said:

How are we doing with the new ingested data into the models tonight??

Quick glance seems like H5 is improved on almost all models, if the trend continues I'd expect some ticks back NW. However even with improvement still dealing with a lack of PVA getting into the region with the ULL turning neutral just too late

Currently the tally in Fleetwood for the season is ~19.5-20 inches or so. There's been a whopping 12 "events" this winter with measurable snowfall... 11 of those events were 2 inches or less. Only 1 storm, the one on January 19th, dropped appreciable snow with 7.9 inches. Talk about a nickel and dime winter, or maybe more appropriately penny and nickel

Genuinely can't remember the last time a storm shifted so bad on guidance, usually it stops bleeding at some point. The Ukie barely even has a surface reflection. It's comical actually

Sister in Reading just lost power, KRDG just gusted to 56mph

Yes the trends have been quite unfavorable, but I don't think we're done seeing changes with the evolution of the upper level low that tugs and phases with the southern vort. The past 4 runs of the Euro have been all over the place with that, it won't be resolved until we're closer in. The phase is just off too. Not saying the changes with the ULL will result in a better outcome, in fact we could see it continue to get worse with the phase. But the Euro still shows 6-8" SE if Philly in south Jersey. There's no reason to believe we can't squeak that NW a bit in 96-102 hours

1 minute ago, RedSky said:

Im back ECM came west with SECS amounts

 

Euro vs everyone

HRRR spikes Philly into the lower 60s with the frontal passage tomorrow and just about mixes out (tiny inversion at the surface) to 850mb with 50-65kt winds. High wind warnings are rightfully justified, could be some widespread 50+ or even 60mph obs at the main reporting stations