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NYC/PHL Dec 26-27 Potential - Part 5


am19psu

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While I obviously don't live in this area, I'm staying in Marlton, NJ for vacation until about New Years. I wouldn't mind a consensus as if we do end up having a substantial snow storm come in I'm going to end up having to start working tomorrow afternoon media wise. Even if this storm does not materialize, this will easily be one of the most memorable storms of for me just because of the constantly changing model output so close to the event time.

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12/19/95 was amazing in Port Jeff...LGA had 7" on the ground the morning of the 20th and I had a coating of freezing drizzle / sleet...thought it was over / no internet (for me) back then / relied on TWC...mixed precip transitioned to light..then moderate to heavy snow the balance of the day...finished with 11".

About what we got in Westchester too.
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(I posted this on the main discussion site a few minutes ago)

WHAT AN AMAZING DAY AND WEEK!

I've never seen anything like this before...such a difference in models so close to a storm, AFTER a flip-flop of both EURO and GFS! Try attempting to make a forecast on TV on such an important weekend.

As for meteorological stuff, we get a special product at NBC10 in Philadelphia called eCast. This is a product from AER in Mass. that creates a MOS based on the EURO ensembles. For example, it gives the POP for every 12 hour period of 01, .10. and .50. A POP of 30 means that 30% of the 51 ensemble members had more than that amount of precip during the period in question. It has had a great track record over the past several years for us.

Curiously, it has had surprisingly low POPs for PHL this week. Even when the operational EURO was hammering us 3 days in a row, the POPs for .50"+ never got over 16%. Today's POPs are 57% for .01", 22% for .10", and 2% for .50"+. That was based on the 00z run.

The eCast maps from the 12z run show the storm track very close to the operational, and precip farther west (but still less than .25" at ACY, and less than .10 at PHL.

If we have the same issues with the 00z runs, I will not be able to sleep tonight (working the 10 and 11pm tomorrow).

My mind goes back to Jan, 2000, when everyone was so sure the storm would stay way offshore. But the radar echoes were way farther west than even the 12 hour forecasts were, so I was able to predict snow up here when other forecasts were still for "partly sunny" (still had no idea we'd get so much). This has taught me to never brag about a forecast before the event, and never say never until the event is over.

Glenn

+1000

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Unreal... That would be be a 6-10" snowfall and the mets locally have written it off already

that's amazing, that would even give us one helluva storm all the way in NEPA....

Still planning on traveling sunday night from the shore to Scranton...that will change if this trend keeps up.

An amazing day. I'm working tomorrow so I'll be in touch with our met on duty to see what they are thinking.

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(I posted this on the main discussion site a few minutes ago)

WHAT AN AMAZING DAY AND WEEK!

I've never seen anything like this before...such a difference in models so close to a storm, AFTER a flip-flop of both EURO and GFS! Try attempting to make a forecast on TV on such an important weekend.

As for meteorological stuff, we get a special product at NBC10 in Philadelphia called eCast. This is a product from AER in Mass. that creates a MOS based on the EURO ensembles. For example, it gives the POP for every 12 hour period of 01, .10. and .50. A POP of 30 means that 30% of the 51 ensemble members had more than that amount of precip during the period in question. It has had a great track record over the past several years for us.

Curiously, it has had surprisingly low POPs for PHL this week. Even when the operational EURO was hammering us 3 days in a row, the POPs for .50"+ never got over 16%. Today's POPs are 57% for .01", 22% for .10", and 2% for .50"+. That was based on the 00z run.

The eCast maps from the 12z run show the storm track very close to the operational, and precip farther west (but still less than .25" at ACY, and less than .10 at PHL.

If we have the same issues with the 00z runs, I will not be able to sleep tonight (working the 10 and 11pm tomorrow).

My mind goes back to Jan, 2000, when everyone was so sure the storm would stay way offshore. But the radar echoes were way farther west than even the 12 hour forecasts were, so I was able to predict snow up here when other forecasts were still for "partly sunny" (still had no idea we'd get so much). This has taught me to never brag about a forecast before the event, and never say never until the event is over.

Glenn

Great post Glenn and thanks for explaining the eCast. I heard you mention it before but I was unsure what it was. Get some rest :).

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Lets hope there is no radio show tonight :arrowhead: *crosses fingers*

Its kind of ironic that the 18z gfs showed exactly what the euro was hinting at a few days ago when certain forecasters (HPC) were hugging it, yet its supposedly being thrown out now...hmmmm dry.gif

They might be right. But I agree with Glenn... I've never seen such a massive model difference two days before a potential storm. This is utterly crazy. The GFS could indeed be off its rocker... but with such small and dynamic systems as the one in the southern plains involved, its hard to know really.

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(I posted this on the main discussion site a few minutes ago)

WHAT AN AMAZING DAY AND WEEK!

I've never seen anything like this before...such a difference in models so close to a storm, AFTER a flip-flop of both EURO and GFS! Try attempting to make a forecast on TV on such an important weekend.

As for meteorological stuff, we get a special product at NBC10 in Philadelphia called eCast. This is a product from AER in Mass. that creates a MOS based on the EURO ensembles. For example, it gives the POP for every 12 hour period of 01, .10. and .50. A POP of 30 means that 30% of the 51 ensemble members had more than that amount of precip during the period in question. It has had a great track record over the past several years for us.

Curiously, it has had surprisingly low POPs for PHL this week. Even when the operational EURO was hammering us 3 days in a row, the POPs for .50"+ never got over 16%. Today's POPs are 57% for .01", 22% for .10", and 2% for .50"+. That was based on the 00z run.

The eCast maps from the 12z run show the storm track very close to the operational, and precip farther west (but still less than .25" at ACY, and less than .10 at PHL.

If we have the same issues with the 00z runs, I will not be able to sleep tonight (working the 10 and 11pm tomorrow).

My mind goes back to Jan, 2000, when everyone was so sure the storm would stay way offshore. But the radar echoes were way farther west than even the 12 hour forecasts were, so I was able to predict snow up here when other forecasts were still for "partly sunny" (still had no idea we'd get so much). This has taught me to never brag about a forecast before the event, and never say never until the event is over.

Glenn

Good luck the next couple of days...this is arguably one of toughest forecasts out there. Jan '00, December 29 '00 both come to mind!

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