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March 20th-22nd Suppressed, Fish, Not Coming Threat


Rjay

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15 minutes ago, RU848789 said:

ok, I'm done whining about models and potential busts for now and am going to enjoy the show.  After about 2 hours of sleep with occasional waking to look out the window, we've ust had a nice hour of moderate snow, heavy for a few stretches (by radar) and we have 3/4" on the ground as of 9 am and it's 31F and sticking to everything. 

With the sun getting higher in the sky we will need more intensity to keep the snow on the paved surfaces, as sun and traffic will do their dirty work, but grassy surfaces should be no issue from here on out, as they're covered with high albedo snow and it's below freezing at the surface.  Not confident in my 12" forecast for Metuchen, but who knows, eh?  That's half the fun. 

It's already sticking on the main roads here in Manhattan Heat Island with moderate to occasionally heavy intensity so the sun angle is not an issue whatsoever.

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1 minute ago, NJwx85 said:

The cutback N&W of NYC is real.

5ab25c929c2b3.png

No, it’s not.  What you’re seeing is the HRRR predicting some midlevel dryness.  But I don’t buy it - it overpredicted that in NYC, and we’re already seeing signs of better saturation in the DGZ with increasing flake size.  It’s the same model with the same initiaization error being posted over and over again by a bad poster.

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1 minute ago, Drz1111 said:

No, it’s not.  What you’re seeing is the HRRR predicting some midlevel dryness.  But I don’t buy it - it overpredicted that in NYC, and we’re already seeing signs of better saturation in the DGZ with increasing flake size.  It’s the same model with the same initiaization error being posted over and over again by a bad poster.

The RAP has it too. I'm hoping that you are correct.

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Excellent discussion from the NWS a few minutes ago. They're sticking with the forecast, but note bust potential near Philly/SNJ on the low side and NW NJ/NE PA on the high side (they have lower forecasts right now). Also confirming what many of us thought would likely be the case - snow/liquid ratios above 10:1. 

National Weather Service Mount Holly NJ
848 AM EDT Wed Mar 21 2018

NEAR TERM /UNTIL 6 PM THIS EVENING/...
8 AM checkin. STS snow grid as posted on PHI web site and in
briefing pkgs conts as is and is from 8AM today through 8 AM
Thursday and does NOT include what occurred between 8 AM ydy and
8AM this morning.

No further briefing pkgs today but we will update the STS as it
becomes apparent to us that amounts will differ more 2 inches
from our fcst. Will we get 10-12" in PHL? Possibly not but its
going to be quite a mess. We already have a widening areas of
MDT snow developing eastern PA and nw NJ just west of the I95
corridor and its only 12z with many reports coming in now of 2"
snowfall in the last several hours.

Also fwiw...temps rose into the upper 30s overnight in the I95
corridor when pcpn quit and still the ice/snow mix held strong.
Ground has been cooled.

We will be issuing LSR`s only for 1/hr snowfall accumulations
and glaze reports elsewhere that totaled 0.1 or greater. Lets
continue sending those reports to us via our skywarn or social
media accts. Both the glaze overnight and the storm total snow
and lets us know how the roads are doing and if any power
outages.

Collapsing thicknesses as pcpn now is changing to sleet and then
snow most of our I95 area except the coast this morning.

Synoptically: no chg from pattern recognition. A big event is
unfolding and we just need to be patient. Significant nearly
stationary banding now evident N central MD to eastern Berks
western Bucks County to near NYC. EVERYONE will share in snow
but the main axis of the S+ should be vcnty MQS-CKZ-SMQ (Chester PA to near Doylestown PA to Somerville). Higher
amts than forecast are possible in the NNJ part of our fcst,
particularly Northampton, Warren, Hunterdon, Morris, Somerset
but we`re not raising at this time until we know for sure what
we already have at 230 PM. If we update...it will be STS (short term statements) only
and posted to our office winter wx web page and also SM.

Inverted trough developing from the developing primary coastal
low through through Ches Bay and that can aid lift to its
northeast. Monitoring.

Regardless of snow amounts, SUBSTANTIAL impacts, including
power outages and additional tree damage, are likely due to a
combination of heavy snow, strong winds, blowing and drifting
snow.

Mesoscale wise: please note we are aware of a typical Berks
county downslope shadow in western Berks. I can see storm totals
ranging 7" western Berks to 15" near Huffs Church in the high
terrain far eastern Berks. No changes yet but we are aware of
the potential.

Snow ratios: in 3 hr increments 12z tdy-07z tonight.
PHL 9,10,11,12,12,12 to 1 using snow ratio blender.

In the cldr ptn of storm e PA/NNJ vcnty I78 10,12,12,12,12,12
to 1 with Poconos slightly higher snow ratio. So even if qpf
were to decrease this aftn, snow ratios will permit greater
hourly accums.

.SHORT TERM /6 PM THIS EVENING THROUGH 6 AM THURSDAY/...
The low will begin to move northeast away from the region,
bringing a gradual end to the snow but still expect an easy 1-3"
after 8 PM. For the most part, expect any significant
accumulations to be over with around 2 AM. Light snow showers
may linger into the early morning hours, especially across
northern NJ. For low temperatures, have gone on the lower side
of guidance in anticipation of a widespread snow pack by that
time.

https://forecast.weather.gov/produc...&format=CI&version=1&glossary=1&highlight=off

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So all the maps being posted show Somerset County in the screw zone and basically in a snow hole like usual, but Mt Holly says this...I'm just west of Somerville. Not feeling confident right now in this forecast. What is Mt Holly looking at that is so different than being posted here?

Synoptically: no chg from pattern recognition. A big event is
unfolding and we just need to be patient. Significant nearly
stationary banding now evident N central MD to eastern Berks
western Bucks County to near NYC. EVERYONE will share in snow
but the main axis of the S+ should be vcnty MQS-CKZ-SMQ (Chester PA to near Doylestown PA to Somerville)
. Higher
amts than forecast are possible in the NNJ part of our fcst,
particularly Northampton, Warren, Hunterdon, Morris, Somerset
but we`re not raising at this time until we know for sure what
we already have at 230 PM.

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