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Tuesday over running event


Mitchel Volk

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SE winds always scare me for any kind of event near the coast, regardless of 850 temps, it could torch like crazy underneath. I'd really like to see more developed offshore solutions before I bite on a significant event from the city east/south. Right now, whatever would enhance the snowpack would be great, a few inches, awesome. Hopefully this trends better, but I'll never be confident of any event on roaring SE winds. The 850s can be -20 for all I care. Of course, inland is another story.

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SE winds always scare me for any kind of event near the coast, regardless of 850 temps, it could torch like crazy underneath. I'd really like to see more developed offshore solutions before I bite on a significant event from the city east/south. Right now, whatever would enhance the snowpack would be great, a few inches, awesome. Hopefully this trends better, but I'll never be confident of any event on roaring SE winds. The 850s can be -20 for all I care. Of course, inland is another story.

And there is s or se winds up to around 850 and s at 850. Tough to pull that off.

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Interesting how now everybody is in love with the Euro again when it was essentially a mess with previous northern stream systems and the gfs killed the Euro with them. If this was another southern stream system then I would choose the Euro for sure, but I gotta go with the gfs on this one.

My previous post just stated that I was worried about the northern stream event and the gfs not being impressed.. However the GFS is by itself as of right now for this storm so going with the GFS is strictly based on a hunch and the fact that it's previously done well with northern stream...and let's not forget the GGEM has also done very well with northern stream this year and it's in line with the euro. but it's anyone's guess

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Btw it's about a 3 to 6 hour shot on the nam of some light to moderate snow.

Probably is mostly rain near the coast and city verbatim. Surface temps are in the upper 30s during a lot of the precip. Not saying it's right but a system like that will have a lot of issues, despite the colder than normal ocean. SE winds despite that are only OK with an Arctic airmass maybe, not one close to marginal.

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Verbatim the 0z NAM is mostly snow at KNYC... barely. 1.8 inches worth is snow, while probably 0.4 is rain. At least from the soundings I see... But alas, it is also the NAM 60+ hours. 

Probably is mostly rain near the coast and city verbatim. Surface temps are in the upper 30s during a lot of the precip. Not saying it's right but a system like that will have a lot of issues, despite the colder than normal ocean. SE winds despite that are only OK with an Arctic airmass maybe, not one close to marginal.

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As JetsPens said, the surface wind may be a big factor on this, the 00Z NAM numerical guidance shows us with 32/25 spread at 12Z when snow comes in at 12Z and a wind thats light SE all night before coming around more E and the ENE once snow begins...my guess is that its too low on surface temps as we'd have thickening clouds all night...wind direction is so dependent on where the low tracks, if this goes S of us I think we're probably okay.....this is also the sort of event that needs to be watched for potential to start early as you're slamming overrunning energy into a high pressure dome...it really does look alot like 1/6/89 and indeed that was the #3 analog on CIPS at 12Z.

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As JetsPens said, the surface wind may be a big factor on this, the 00Z NAM numerical guidance shows us with 32/25 spread at 12Z when snow comes in at 12Z and a wind thats light SE all night before coming around more E and the ENE once snow begins...my guess is that its too low on surface temps as we'd have thickening clouds all night...wind direction is so dependent on where the low tracks, if this goes S of us I think we're probably okay.....this is also the sort of event that needs to be watched for potential to start early as you're slamming overrunning energy into a high pressure dome...it really does look alot like 1/6/89 and indeed that was the #3 analog on CIPS at 12Z.

Interesting thing is the direction that all this is occurring on the sw/wsw flow into the departing Hp. Did 89 also feature a warmer pattern setting in afterwards?

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Like Mitchell said. ..U.S suite versus the euro/ggem

I'm thinking the Euro is too amped and wet here, unless the far digging and strong low idea works out. I'm more okay with a weaker overrunning event for a couple of inches than the big event idea, unless said big event can pivot the winds around. The Euro hasn't been so great with northern stream events this year and became too amped on today's event, so let's see what happens. I'm on the flatter/weak train until further notice.

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Mt. Holly still bullish on snow for late Monday night into Tuesday, based on the HWO, as per below.

HAZARDOUS WEATHER OUTLOOK

NATIONAL WEATHER SERVICE MOUNT HOLLY NJ

852 PM EST SAT FEB 15 2014

NJZ001-007>010-012-015-PAZ054-055-060>062-101>106-170200-

SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-MERCER-CARBON-

MONROE-BERKS-LEHIGH-NORTHAMPTON-WESTERN CHESTER-EASTERN CHESTER-

WESTERN MONTGOMERY-EASTERN MONTGOMERY-UPPER BUCKS-LOWER BUCKS-

852 PM EST SAT FEB 15 2014

DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

A MODERATE TO POSSIBLY HEAVY SNOW ACCUMULATION IS EXPECTED LATE

MONDAY NIGHT THROUGH MIDDAY TUESDAY.

As an aside, their point-and-click forecast, hourly weather graphic indicates about 4.3" of snow falling from about 1 am to noon on Tuesday, followed by about 0.1" of rain, as temps climb to 36F by noon. I'm curious - does anyone know what algorithm the NWS uses for those hourly forecasts? Are they based on one model or some blend (they often talk about the model blends they use in the AFD's)? Thanks, in advance.

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