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January 30, 2019 Snow Squall Observations Thread


bluewave

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woohoo

239 PM EST WED JAN 30 2019
Bergen County NJ-Essex County NJ-Hudson County NJ-Passaic County
NJ-Union County NJ-Orange County NY-Rockland County NY-Westchester
County NY-

The National Weather Service in Upton NY has issued a

* Snow Squall Warning for...
Hudson County in northeastern New Jersey...
Passaic County in northeastern New Jersey...
Union County in northeastern New Jersey...
Bergen County in northeastern New Jersey...
Essex County in northeastern New Jersey...
Northern Westchester County in southeastern New York...
Southeastern Orange County in southeastern New York...
Rockland County in southeastern New York...

* Until 345 PM EST.

* At 239 PM EST, a dangerous snow squall was located along a line
extending from West Milford to near Far Hills to Roxborough, moving
east at 45 mph.

HAZARD...Whiteout conditions. Zero visibility in heavy snow and
blowing snow. Wind gusts 35 to 45 mph.
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Just now, tomcatct said:

Is there a possibility in any of these snow squalls to get any Thunder that you would normally see in the summertime when a cold front comes through and get the thunderstorms?

Yes, but the best chances will be across LI over to southern New England.

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Yes, but the best chances will be across LI over to southern New England.
This is basically the same physics as thunderstorms, just with bitterly cold Temperatures. The baroclynic gradient setting up is rather intense, yet initial temperatures are cold enough for this to be snow?
Correct?

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Snow squall warning for NYC

 "At 255 PM EST, a dangerous snow squall was located along a line
extending from near Kerhonkson to near Florence-Roebling, moving
east at 35 mph.

HAZARD...Whiteout conditions. Zero visibility in snow and blowing
snow. Wind gusts to 50 mph."

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11 minutes ago, USCG RS said:

This is basically the same physics as thunderstorms, just with bitterly cold Temperatures. The baroclynic gradient setting up is rather intense, yet initial temperatures are cold enough for this to be snow? Correct?

yep, just a rare winter-time version. this line is strongly forced by the arrival of the bitter cold air mass. see 925mb temperature advection below:

925_T_adv.thumb.png.1b1b85f6608941609acce0756856d6d7.png

the sfc-3km lapse rates posted on the previous page would be displaced much higher in the atmosphere during a summer-time event, although not to the magnitude observed today. a 140KT 500mb jet in spring/summer would also be outrageous. many of the large-scale tornado outbreaks are associated with 100KT up there.

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