MGorse

There were several 3-6 inch reports in New Castle County, DE. Given that and some other reports in Philly, I would say 4 inches in south Philly is too low.

I feel like I am being interviewed. Lol. That statement sums it up well. Many times this is being said incorrectly because the energy is not being transferred. New coastal low develops due to incoming upper level support (results in surface pressure falls) while the inland low weakens then dissipates as the upper level support leaves it behind.

If we do not receive an updated report or final report then that is removed from the PNS. This is because it then becomes less representative. We do our best to quality control all reports but there are times when some slip through. If we catch it later then it is removed. We usually get tons of reports for snow events (overwhelming at times). Also, keep in mind that the airports that measure snow (PHL, ABE, ILG and ACY in our area) continue to measure and report every 6 hours.

I continue to post here from time to time, and yes I am still at NWS Mount Holly. The PHL measurement has not been taken in National Park, NJ in years. It is done at the airport. Airport’s are not the best places to measure snow but they do their best. As for snow ratios, we have in-house tools where we can blend different models to get the values desired. WPC also provides guidance on the ratios. Lots of internal collaboration occurs especially with big events like yesterday. We then use tools that take the forecast QPF and apply the selected ratios to give snowfall amounts. This can also account for temperatures as well. So in short, our forecast snowfall does account for ratios.

It is technically in Delaware County. We list it as in Philadelphia County though for continuity plus it represents Philadelphia.

According to his Facebook post a few hours ago, 6ABC has Philly in the 6-12 inch range (highest east into interior south NJ).

Not bad. Definitely overperformed.

I don't drink coffee, but maybe I should.

Oh it has been loads of fun!

PRE = Predecessor Rain Event

Those self checkouts and I do not always get along, especially at grocery stores!

When is he not doing that?!

That was just for you.

0.5-2 inches is bullish?

Rochester Airport reporting 2 inches in the last hour... KROC 171454Z 04019G27KT 1/4SM R04/1600V2600FT +SN FZFG BLSN VV006 M03/M04 A2912 RMK AO2 PK WND 04027/1454 SLP869 SNINCR 2/8 P0005 60010 T10281039 56012

Yup... KROC 171354Z 04015KT 1/4SM R04/2000V2800FT +SN FZFG BLSN VV005 M02/M03 A2913 RMK AO2 SLP873 P0004 T10221028

You know you want to.

It is quite amazing, but I like snow so it is rather frustrating as well.

Short staffed again but we are making it work. Amazing the arctic air in place now will be gone tonight with just a wind driven rain occurring.

Well now, I am glad I did not name the actual town! LOL

Also, the county of my hometown.

Technically that is not WPC adding it. Those graphics include the NDFD forecasts which are issued by the NWS forecast offices.

I am not seeing much evidence in the forecast soundings of elevated instability. The 12z NAM though hints at it for a time at ROC early Monday morning, but probably not enough. Given the dynamics though, it would not be shocking if there are a few lightning flashes associated with the peaking deformation band.

The 850 mb and 700 mb frontogenetic forcing across western NY looks to be very impressive, particularly associated with the developing and pivoting deformation zone. Here is a snapshot of the 700 mb frontogenesis when the snowfall rates look to be peaking (via the 12z GFS).

Plowing that amount of sleet sounds like they are pushing glass. I remember hearing that when I lived in State College.