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NYC/PHL 12/21-12/22 Threat


hazwoper

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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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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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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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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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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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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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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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