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3/3 Arctic Front Snow Squall/Showers Discussion/OBS Thread


bluewave

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Models introduce the potential for snow squalls or showers later today with the passage of the Arctic front. Latest HRRR has a solid line that breaks into segments while crossing the area. All the models have unusually steep lapse rates from the surface to the mid levels with elevated TT's. So it's possible that some parts of the region could experience a brief heavier snowburst reducing visibility with gusty winds around the evening commute.

 

hrrr_ref_nyc_12.png

 

GFS.gif

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NORTHERN FAIRFIELD-NORTHERN NEW HAVEN-NORTHERN MIDDLESEX-
NORTHERN NEW LONDON-SOUTHERN FAIRFIELD-SOUTHERN NEW HAVEN-
SOUTHERN MIDDLESEX-SOUTHERN NEW LONDON-WESTERN PASSAIC-
EASTERN PASSAIC-HUDSON-WESTERN BERGEN-EASTERN BERGEN-
WESTERN ESSEX-EASTERN ESSEX-WESTERN UNION-EASTERN UNION-ORANGE-
PUTNAM-ROCKLAND-NORTHERN WESTCHESTER-SOUTHERN WESTCHESTER-
NEW YORK (MANHATTAN)-BRONX-RICHMOND (STATEN ISLAND)-
KINGS (BROOKLYN)-NORTHWESTERN SUFFOLK-NORTHEASTERN SUFFOLK-
SOUTHWESTERN SUFFOLK-SOUTHEASTERN SUFFOLK-NORTHERN QUEENS-
NORTHERN NASSAU-SOUTHERN QUEENS-SOUTHERN NASSAU-
1228 PM EST Fri Mar 3 2017

Scattered snow showers with possible embedded snow squalls are
expected to move through the Tri-State area late this afternoon
into early evening, affecting the evening rush. During this time,
brief heavy snowfall with the visibility reduced to below a half
mile along with wind gusts up to around 40 mph will be possible.
In addition, a quick snow accumulation of up to an inch will be
possible in spots.

The best chance for snow will arrive around 4 to 6 pm this
evening across the lower Hudson Valley and Northeast New Jersey,
around 6 pm across NYC, and 6 pm to 8 pm for most of Connecticut
and Long Island.

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The Central PA snowhole finally beginning to fill in a bit.

125 PM EST FRI MAR 3 2017

...DANGEROUS SNOW SQUALLS TRACKING ACROSS CENTRAL PENNSYLVANIA...

HAZARDS...A large and dangerous snow squall which can rapidly reduce visibility
to near zero.

LOCATION AND MOVEMENT...At 123 PM EST, a dangerous snow squall was
along a line extending from near Avis to Bald Eagle State Park to
near Sandy Ridge to near Indiana and moving southeast at 25 MPH. Additional
scattered snow squalls were tracking across Cambria Blair and Huntingdon
Counties.


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23 minutes ago, bluewave said:

The JB snowhole finally beginning to fill in a bit.


125 PM EST FRI MAR 3 2017

...DANGEROUS SNOW SQUALLS TRACKING ACROSS CENTRAL PENNSYLVANIA...

HAZARDS...A large and dangerous snow squall which can rapidly reduce visibility
to near zero.

LOCATION AND MOVEMENT...At 123 PM EST, a dangerous snow squall was
along a line extending from near Avis to Bald Eagle State Park to
near Sandy Ridge to near Indiana and moving southeast at 25 MPH. Additional
scattered snow squalls were tracking across Cambria Blair and Huntingdon
Counties.


They have some crazy ones out there. I remember a few times the squall coming in like a white wall in otherwise partly cloudy skies, drop a half inch to inch in 10-15 minutes and end just as fast. You could see the squall then push east and whiten up the ground and hills as it went east. They're terrible for the interstates though, almost guaranteed there will be accidents on I-80. 

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13 minutes ago, jm1220 said:

They have some crazy ones out there. I remember a few times the squall coming in like a white wall in otherwise partly cloudy skies, drop a half inch to inch in 10-15 minutes and end just as fast. You could see the squall then push east and whiten up the ground and hills as it went east. They're terrible for the interstates though, almost guaranteed there will be accidents on I-80. 

I remember one like that in Long Beach back in the 80's or early 90's. I believe it was in March when a powerful snow squall l came into Long Beach with giant flakes and visibilities under a quarter of a mile. Got dark like a summer thunderstorm and the grass and cars got coated with temps starting in the low 40's and falling into the 30's during the squall.

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38 minutes ago, JERSEYSNOWROB said:

Moderate to heavy snow squall moving through here at work in Mercer county.

You are having the same snow squall that came through my area earlier.  This snow squall has caused sections of I-80 and I-81 in PA to be closed on account of multi-vehicle accidents.  A section of I-78 near me is at a standstill due to a related accident.  You can draw a line between where you are, where I live, and the closed interstates in PA and that shows the path of this snow squall.

 

 

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