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NYC/PHL 12/21-12/22 Threat


hazwoper

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  On 12/18/2010 at 8:45 PM, Collegestudent11 said:

I have heard the NAM has a tendency to crush the N/W extent of the precipitation shield. On the 18z the .25 line it about 10 miles away from the .1 line in Southeast Coastal New Jersey.

The nam tendency is the opposite, it tends to place the surface low too far northwest into the cold air.

What is occurring with the 18z nam has to do with short wave that will be in Missouri this evening, that is the point to investigate with the soundings this evening.

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  On 12/18/2010 at 8:42 PM, Ericjcrash said:

Imagine if they were to be right.:whistle::whistle::whistle:

Nightmare.

I think a significant snowfall is definitely possible for the twin forks, norlun trough or not, these systems not always but frequently manage to have the precip shield a bit NW of where its forecast to be...I might have put a watch out for the east suffolk zones this afternoon to be safe.

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  On 12/18/2010 at 8:49 PM, Rainshadow said:

The nam tendency is the opposite, it tends to place the surface low too far northwest into the cold air.

What is occurring with the 18z nam has to do with short wave that will be in Missouri this evening, that is the point to investigate with the soundings this evening.

long shot but what would we need that shortwave to do to make it more "interesting" for our area?

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  On 12/18/2010 at 8:49 PM, Rainshadow said:

The nam tendency is the opposite, it tends to place the surface low too far northwest into the cold air.

What is occurring with the 18z nam has to do with short wave that will be in Missouri this evening, that is the point to investigate with the soundings this evening.

I'm aware it does that, but doesn't it sometimes have the gradient of the precip a bit sharper than actually verifies on alot of systems?

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  On 12/18/2010 at 8:49 PM, Rainshadow said:

The nam tendency is the opposite, it tends to place the surface low too far northwest into the cold air.

What is occurring with the 18z nam has to do with short wave that will be in Missouri this evening, that is the point to investigate with the soundings this evening.

Does it predict the the s/w will pull the low back towards the area, and thus the shift westward?

On the NAM question, i noticed the GFS provides more qpf coverage on maps than others Is this due to the lower resolution, and thus it just decided to put large precipitation totals?

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  On 12/18/2010 at 8:50 PM, SnowGoose69 said:

I think a significant snowfall is definitely possible for the twin forks, norlun trough or not, these systems not always but frequently manage to have the precip shield a bit NW of where its forecast to be...I might have put a watch out for the east suffolk zones this afternoon to be safe.

You work at NWS upton? i always wondered why the NWS office was never in New York City proper, instead of Long Island.

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  On 12/18/2010 at 8:53 PM, Collegestudent11 said:

You work at NWS upton? i always wondered why the NWS office was never in New York City proper, instead of Long Island.

Cheaper rent on Long Island.

It's on the grounds of Brookhaven National Laboratory. There are probably benefits to having facilities like that collocated.

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  On 12/18/2010 at 8:51 PM, SnowGoose69 said:

I'm aware it does that, but doesn't it sometimes have the gradient of the precip a bit sharper than actually verifies on alot of systems?

The nam qpf overall is just frustrating. Alot of times its spin up is so slow its already 6 hrs late at fcst hour 12 and in the short term too stingy with qpf. But then once it gets the idea about qpf it overdoes it, sussex county de on the 06z nam the other night was suppose to get .25" w/e, didn't event get half and the same run IIRC didn't bring measurable to PHL which was also wrong.

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  On 12/18/2010 at 8:58 PM, Collegestudent11 said:

Interesting, i always wondered about the seemingly random locations for NWS offices, such as Mount Holly, Upton, and Binghamton. The first time i heard about upton, i had to google it to find out where it was.

The idea was to move it out of the cities to remove ground clutter problems.

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  On 12/18/2010 at 9:05 PM, bluewave said:

Yeah,but some of the other less extreme members are just a tad wetter also.

  On 12/18/2010 at 9:05 PM, Rtd208 said:

Not for nothing, but the individual 15z SREF's do look further NW then the 9z SREF's did.

yea i deff agree...the 18z rgem is coming out now, lets see what this show for li and jerz shore

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