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Dec 17-18 Front End Snow/Ice/Rain Event


dmillz25

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38 minutes ago, weathermedic said:

Words of caution: There will be icing conditions on any untreated surfaces even at the coast for an hour or two after the surface temp rises above freezing and it is raining Saturday because the ground has been below freezing for around 48 hours or more by Saturday morning.

Maybe in some rural areas, but certainly not on any roads in NYC or the surrounding suburbs in NE Jersey.  Once a winter storm is underway and the temperature rises above 32 degrees, its all over.  At least I have never seen this happen.  If the precip were to start a little after the temperature went above the freezing mark, you could get a quick glaze. 

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Could be I'm missing something, but why does the NWS have advisories up for the I-95 corridor from Trenton to NYC for 1-2" of snowfall, when the criterion is 3" or more for those counties?  Is it the risk of "a few hundredths of an inch" of ice?  And especially for counties in NJ/DE which are SE of I-95 and only expecting an inch or less of snow (and those counties have a 2" advisory criterion).  

 

New_12hour_WWY_Criteria_2015-16.png

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Just now, RU848789 said:

Could be I'm missing something, but why does the NWS have advisories up for the I-95 corridor from Trenton to NYC for 1-2" of snowfall, when the criterion is 3" or more for those counties?  Is it the risk of "a few hundredths of an inch" of ice?  And especially for counties in NJ/DE which are SE of I-95 and only expecting an inch or less of snow (and those counties have a 2" advisory criterion).  

 

New_12hour_WWY_Criteria_2015-16.png

Ice potential 

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12 minutes ago, RU848789 said:

Could be I'm missing something, but why does the NWS have advisories up for the I-95 corridor from Trenton to NYC for 1-2" of snowfall, when the criterion is 3" or more for those counties?  Is it the risk of "a few hundredths of an inch" of ice?  And especially for counties in NJ/DE which are SE of I-95 and only expecting an inch or less of snow (and those counties have a 2" advisory criterion).  

 

New_12hour_WWY_Criteria_2015-16.png

They issued an advisory Sunday as well when there was no ice and not even an inch of snow

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That frontal wave that the models have been focusing in on more in recent runs isn't such good with more sleet and freezing rain.

This would lock in colder temps near the surface especially away from the coast while the LLJ rips with strong WAA aloft.

So areas can see more icing than the models were showing a few days ago. Tomorrow is a big shopping day and

travel across the interior could be very slick.

 

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