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NYC/PHL January 25-27 Potential Bomb Part 6


earthlight

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Before people jump off their chairs, etc, etc., remember the NAM has been on the eastern envelope of solutions and this is still over 24 hours out. Models handle deform and banding very poorly. I would consider the area from eastern pa north to se ny over to nw ct down to long island very much in the kill zone for potential heavy deform banding.

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The NJ winter rolls on per NAM .. incredible

And dropped for Berks north?

IMO...signal for 6hr deformation band thump...still there....location of that thump is a bit different on every model and every run since 18z yesterday. It might be agonizing, it doesn't mean much. IIRC the 6z NAM basically lost the whole band SE and out to sea.

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Before people jump off their chairs, etc, etc., remember the NAM has been on the eastern envelope of solutions and this is still over 24 hours out. Models handle deform and banding very poorly. I would consider the area from eastern pa north to se ny over to nw ct down to long island very much in the kill zone for potential heavy deform banding.

Don't think we are jumping.. its just the 1st 12z run with more to come...

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Part of the CWA already has a WSW.

This is a tricky forecast with a very high bust potential.

Please don't call out/insult our fine NWS mets who take time out of their work to post here and share their thoughts with us. It's easy for you to forecast for yourself but they're forecasting for an entire metropolitan area and responsible for millions of people and dollars.

Great post! I dislike it when people with no forecasting skill or knowledge write stuff like "what is Mt. Holly thinking - no guidance shows that" or "that TV weatherman is going too conservative with his call" before a storm even hits! Those types of posts should be kept to the banter threads, if they should even be made at all. If you were a broadcast meteorologist reading threads with all sorts of shots taken at you, would you want to make a post?

Anyway, like all of you, I can hardly wait to see the rest of the 12 Z model suite. I'm already under a Winter Storm Watch here.

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Before people jump off their chairs, etc, etc., remember the NAM has been on the eastern envelope of solutions and this is still over 24 hours out. Models handle deform and banding very poorly. I would consider the area from eastern pa north to se ny over to nw ct down to long island very much in the kill zone for potential heavy deform banding.

I agree with 24 hours out, the gradient is still very tough to pin down and they usually become a real-time tracking where the best deform and higher bands setup. The ecm has been consistent ride it. I'm frankly more worried about mixing than missing. But trends are nice i-95 on east.... This time much more widespread. If the nam had its druthers Englishtown NJ looks like a sweet spot (no bias here)

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Great post! I dislike it when people with no forecasting skill or knowledge write stuff like "what is Mt. Holly thinking - no guidance shows that" or "that TV weatherman is going too conservative with his call" before a storm even hits! Those types of posts should be kept to the banter threads, if they should even be made at all. If you were a broadcast meteorologist reading threads with all sorts of shots taken at you, would you want to make a post?

Anyway, like all of you, I can hardly wait to see the rest of the 12 Z model suite. I'm already under a Winter Storm Watch here.

I actually misread his post, which is why I yanked mine. I thought he was calling out the NWS, but he said TV mets would have "egg on their face". Which I can agree with. Anyway we can take this to the Weather and TV thread...

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Can't blame upton for being conservative here. This is basically a situation that needs the PERFECT solution to yield those bigtime snow totals especially for nonelevated areas. They cannot simply base a forecast on what will happen if a deform band sets up over the area. They have to base it off of meteorological reasoning.

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not to go off topic but went to bed around 11pm with around 1" then woke up around 6:30am with 18"

I remember that very well. We had to drive down to the OBX that weekend for some business and drive right back. I suggested we postpone due to the snow. I went to bed with around 1" on the ground thinking what a bust...woke up to 16". I can't believe I slpet through that one.

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not to go off topic but went to bed around 11pm with around 1" then woke up around 6:30am with 18"

Greatest storm I've experienced. Stayed up for the whole thing, multiple hours of 4"+/hr rates. Ended up with 20.5" here from the greatest deform band known to Honey Brook. Yesterdays guidance said it could happen again but now it seems to have slid east.

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Mt Holly coming out with more watches at 1115. From new AFD

.SHORT TERM /7 PM THIS EVENING THROUGH WEDNESDAY NIGHT/...

***WATCH EXPANSION INTO NE MD...N DEL AND MUCH OF NJ EXCEPT FAR

SOUTH PROBABLE AT 1115 AM PENDING NEW GFS***

PLEASE GIVE US TIME ON THIS. WE ALL SAW THE NEW 12Z NAM WITH HUGE

SNOWGROWTH AND QPF AMTS UNDER THE DEFORMATION ZONE NW OF THE NAMS

MORE DEFINED 500MB STRUCTURE. COULD BE THUNDER SNOW WED EVE. COLLAB

WITH HPC AT 8AM REGARDING MY UNCERTAINTY FURTHER NW IN NE PA AND

NW NJ BUT AWAITING ALL THE MODELS BEFORE ANY POSSIBLE TRIM THERE.

FOCUS "MAY" BE SHIFTING SEWD 30 MILES.

MORE AT 1115 AM.

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For PHL, 1.26" all levels below freezing. Although the surface rises to 31.9 as the precip is starting.

0.75" in 3 hours, 1.02" in 6 hours.

For DYL, 0.71" all levels below freezing.

0.39" in 3 hours, 0.64" in 6 hours.

For NYC, 0.87" all levels below freezing while precip is falling.

0.85" in 9 hours.

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