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NYC/PHL January 7-9 Potential Part Deux


NickD2011

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Yeah they did:

TO ADD YET ANOTHER PIECE...SURFACE LOW PRESSURE MOVES VERY CLOSE

TO EASTERN LONG ISLAND...SO IT WOULD NOT BE SURPRISING FOR ENOUGH

ABOVE-FREEZING AIR TO FORCE A CHANGEOVER TO RAIN FOR A BIT FRIDAY

NIGHT.

Don't think that means it's close enough to pump up a QPF however.

Its probably a matter of the low developing "too late" to be of much impact-- ordinarily a low in that position would be great for us, however, those that are usually start further to the south and then track over that region later.

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OKX and Mt Holly radar both seem to be out at the moment. OKX did show some precip over the north shore of western LI (i.e., Queens/Nassau) before it went out.

Yep both down:

RADAR FREE TEXT MESSAGE

NATIONAL WEATHER SERVICE NEW YORK NY

1054 AM EST THU JAN 6 2011

THE NATIONAL WEATHER SERVICE DOPPLER WEATHER RADAR AT UPTON NY

(KOKX) IS DOWN FOR MAINTENANCE FOR THE REMAINDER OF THE DAY

NOUS61 KPHI 060217

FTMDIX

Message Date: Jan 06 2011 02:17:34

The KDIX Doppler Radar will remain down for maintenance until at least 21Z/4 PM

on Thursday, January 6, 2011.

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Yep both down:

RADAR FREE TEXT MESSAGE

NATIONAL WEATHER SERVICE NEW YORK NY

1054 AM EST THU JAN 6 2011

THE NATIONAL WEATHER SERVICE DOPPLER WEATHER RADAR AT UPTON NY

(KOKX) IS DOWN FOR MAINTENANCE FOR THE REMAINDER OF THE DAY

NOUS61 KPHI 060217

FTMDIX

Message Date: Jan 06 2011 02:17:34

The KDIX Doppler Radar will remain down for maintenance until at least 21Z/4 PM

on Thursday, January 6, 2011.

Hey, how cold were you this morning? We had lows close to 20 here. Did you see snow flurries too?

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1pm NWS update from PHI

http://forecast.weat...0&highlight=off

THERE ARE SEVERAL TRENDS THAT HAVE DEVELOPED IN THE

LATEST MDL GUIDANCE. THE FIRST IS THAT THE OVERALL QPF IS LOWER,

WHICH WOULD RESULT IN LOWER SNOWFALL TOTALS. THE SECOND TREND IS

THAT, WITH THE POSSIBLE EXCEPTION OF EXTREME NRN NJ, MOST AREAS

WILL BE DONE WITH PRECIP BY 00Z, WITH SRN AREAS DONE EVEN SOONER.

ACRS THE FAR N, IT MAY TAKE UNTIL 06Z SAT TO FINISH UP.

BASED ON THESE MODEL SIGNALS INDICATING REDUCED SNOWFALL AMTS, IT

APPEARS THAT IT MAY BE AN ADVISORY EVENT ACRS THE FAR N AND BELOW

ADVISORY ELSEWHERE. IT MAY END UP THAT WE ARE BORDERLINE ADVISORY

FURTHER S, IF LATER GUID COMES IN WITH HIGHER QPF, BUT THAT CAN BE

ADDRESSED BY LATER SHIFTS. WITH AFTN HIGH TEMPS EXPECTED TO GET

INTO THE MID 30S IN MANY AREAS THAT MAY HELP IMPEDE SNOW FROM

ACCUMULATING ON ROADWAYS.

-----

I'd be a bit concerned not issusing an advisory for their central zones based solely on the timing of the period of snow. It could be a real mess between 6-10am in the northwest (25-50 miles) Philly suburbs.

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Perhaps a silly question from an amateur - everything I have read about this type of system is that it is unstable and relatively hard to forecast. The primer that someone had posted a few dozen pages back about the events in Maine and the Cape mentioned that the systems caught everyone totally unaware. Now, I understand that the models have improved since then, and more attention is being paid to this type of system. Is there any remaining sense, however, that the QPF amounts, and the relative strength of the system, are still going to be poorly-modeled? So, would it be fair to say that the more important feature on the models is the existence of "a storm," while all of the details, including QPF, the set-up of the strongest band, etc., are really going to be beyond the ability of the models to accurate forecast?

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Yep both down:

RADAR FREE TEXT MESSAGE

NATIONAL WEATHER SERVICE NEW YORK NY

1054 AM EST THU JAN 6 2011

THE NATIONAL WEATHER SERVICE DOPPLER WEATHER RADAR AT UPTON NY

(KOKX) IS DOWN FOR MAINTENANCE FOR THE REMAINDER OF THE DAY

NOUS61 KPHI 060217

FTMDIX

Message Date: Jan 06 2011 02:17:34

The KDIX Doppler Radar will remain down for maintenance until at least 21Z/4 PM

on Thursday, January 6, 2011.

If I may, a link to a radar independent from the NWS... FOX 5's Sky Guardian http://www.myfoxny.c...x/weather/radar

... not the greatest in terms of detail, but a good auxiliary radar while the others are down... it is indicating spotty snow showers over Long Island and just offshore.

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Got down to 14.5 in Muttontown this morning. Here in Great Neck I didn't see any flurries this morning.

Low of 20.3F here in Westchester....currently 29.4F and OVC. I don't really see the worry about temperatures wtih this system, it's more a problem of getting into the heavier banding and avoiding the Norlun moving NE too fast to give a solid accumulation. 850mb temperatures range from approximately -8C at the beginning of the snowfall to -11C at the end of the event, so it looks as if most places will be in the upper 20s/low 30s with snow immediately sticking to roads if it falls heavily enough. I think people always make too much of an issue of BL temps, and that's especially true here with an early January sun angle and cold 850s as well as some decent dynamics.

Overall, we seem to be starting another cold and snowy stretch.

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the euro is .10+ for all of us...perhaps close to .20 in the city...and .25+ for eastern LI and all of ct

there is two period of snow on the euro one 2morrow...and then again saturday...it spins up a late costal off acy....hr 60 it about 200 miles se of the eastern tip of LI

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The coding includes Delaware County.

That's odd based on their 1pm disco...

BASED ON THESE MODEL SIGNALS INDICATING REDUCED SNOWFALL AMTS, IT

APPEARS THAT IT MAY BE AN ADVISORY EVENT ACRS THE FAR N AND BELOW

ADVISORY ELSEWHERE. IT MAY END UP THAT WE ARE BORDERLINE ADVISORY

FURTHER S, IF LATER GUID COMES IN WITH HIGHER QPF, BUT THAT CAN BE

ADDRESSED BY LATER SHIFTS. WITH AFTN HIGH TEMPS EXPECTED TO GET

INTO THE MID 30S IN MANY AREAS THAT MAY HELP IMPEDE SNOW FROM

ACCUMULATING ON ROADWAYS.

I guess I read it wrong, and they are issuing regionwide, and maybe cutting back later. That makes more sense.

Thanks for the clarification.

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