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FOLKS Feb 19-20 Debacle


ravensrule
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1 hour ago, Interstate said:

Well since no model had anything on it for a few days... I was wondering why they even posted a WWA anyways.

That’s not even remotely true.  Several models yesterday had a band of light snow moving through the area this morning.   It’s a real thing, but it’s just too light.  Even if it ended up not working out, LWX doesn’t make up advisories out of nothing. 

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5 minutes ago, high risk said:

That’s not even remotely true.  Several models yesterday had a band of light snow moving through the area this morning.   It’s a real thing, but it’s just too light.  Even if it ended up not working out, LWX doesn’t make up advisories out of nothing. 

The issue was extremely dry air east of the blue ridge and north of 29. Not sure that was foreseen, but I think a lot of precip evaporated before reaching the ground.

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6 minutes ago, high risk said:

That’s not even remotely true.  Several models yesterday had a band of light snow moving through the area this morning.   It’s a real thing, but it’s just too light.  Even if it ended up not working out, LWX doesn’t make up advisories out of nothing. 

A lot of modeling had the accumulated precip west of the metros though. But let’s be real, they issued it as a cover your ass advisory because it was potentially close to rush hour. If it was something that was overnight, it likely would not have been issued. Having said that, in my opinion, one of those special weather statements saying “a potential hazardous weather situation has a 30-50% chance of materializing” things would have been more appropriate for this case. Nothing was really showing up to 1” potential. 

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1 minute ago, Terpeast said:

The issue was extremely dry air east of the blue ridge and north of 29. Not sure that was foreseen, but I think a lot of precip evaporated before reaching the ground.

Agreed.  The NAM Nest had the band falling apart as it moved east, which was a clue that the scenario shown by some of the other CAMs wouldn’t play out. 
 

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So my analog identification didn't fail...my imagination did.  During my crusade to show that "not a single remotely similar setup to this produced a significant snowstorm for Richmond or the Delmarva I failed to entertain the possibility that guidance was still correcting south and it would end up a VA Tidewater and Eastern NC snowstorm.  The analogs DID fit several of VA Beach and the Outer Banks biggest snows.  This storm would not have been identified in my efforts to find a comp because at that time every model was showing a big snowstorm for Richmond to S NJ so I looked at every 8" snow at Richmond and Salisbury...but this ended up well below that level for those locations.  Had I pulled up 8" snows for VA beach and Elizabeth City NC I would have found very good comps and I immediately did as soon as I looked at that set.   Analogs did win out over models...just in the opposite direction from what I had thought!  

The premise being a strong upper level feature crossing through the Midwest, Ohio and PA is not going to produce a major snowstorm for central VA and the Delmarva.  There are two possible outcomes with that track of a strong ULL...either it causes a phased storm which will end up north...and likely we would be on the southern edge of heavy snow with such a storm and the max would be NW of us.... or its going to not phase and the ULL will act as a suppressive feature and whatever wave there is will track way way south of us.  

I was not open to the idea it would end up as suppressed as it did at the time so I failed to see the correct outcome.  

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7 minutes ago, psuhoffman said:

So my analog identification didn't fail...my imagination did.  During my crusade to show that "not a single remotely similar setup to this produced a significant snowstorm for Richmond or the Delmarva I failed to entertain the possibility that guidance was still correcting south and it would end up a VA Tidewater and Eastern NC snowstorm.  The analogs DID fit several of VA Beach and the Outer Banks biggest snows.  This storm would not have been identified in my efforts to find a comp because at that time every model was showing a big snowstorm for Richmond to S NJ so I looked at every 8" snow at Richmond and Salisbury...but this ended up well below that level for those locations.  Had I pulled up 8" snows for VA beach and Elizabeth City NC I would have found very good comps and I immediately did as soon as I looked at that set.   Analogs did win out over models...just in the opposite direction from what I had thought!  

The premise being a strong upper level feature crossing through the Midwest, Ohio and PA is not going to produce a major snowstorm for central VA and the Delmarva.  There are two possible outcomes with that track of a strong ULL...either it causes a phased storm which will end up north...and likely we would be on the southern edge of heavy snow with such a storm and the max would be NW of us.... or its going to not phase and the ULL will act as a suppressive feature and whatever wave there is will track way way south of us.  

I was not open to the idea it would end up as suppressed as it did at the time so I failed to see the correct outcome.  

So in the end did the models H5 also adjusted to the surface instead of the otherway around too?

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1 hour ago, psuhoffman said:

So my analog identification didn't fail...my imagination did.  During my crusade to show that "not a single remotely similar setup to this produced a significant snowstorm for Richmond or the Delmarva I failed to entertain the possibility that guidance was still correcting south and it would end up a VA Tidewater and Eastern NC snowstorm.  The analogs DID fit several of VA Beach and the Outer Banks biggest snows.  This storm would not have been identified in my efforts to find a comp because at that time every model was showing a big snowstorm for Richmond to S NJ so I looked at every 8" snow at Richmond and Salisbury...but this ended up well below that level for those locations.  Had I pulled up 8" snows for VA beach and Elizabeth City NC I would have found very good comps and I immediately did as soon as I looked at that set.   Analogs did win out over models...just in the opposite direction from what I had thought!  

The premise being a strong upper level feature crossing through the Midwest, Ohio and PA is not going to produce a major snowstorm for central VA and the Delmarva.  There are two possible outcomes with that track of a strong ULL...either it causes a phased storm which will end up north...and likely we would be on the southern edge of heavy snow with such a storm and the max would be NW of us.... or its going to not phase and the ULL will act as a suppressive feature and whatever wave there is will track way way south of us.  

I was not open to the idea it would end up as suppressed as it did at the time so I failed to see the correct outcome.  

HM also thought like you. He believed in a Northern Mid-Atlantic SECS to a MECS.  Weather is fascinating. 

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3 hours ago, Bob Chill said:

Shut off like a switch. 1.8" yesterday and 1.8" today. 2 completely different experiences but hit 3.6" total. Blue sky is in the distance. Should be good photo ops here shortly. 

I'm not really that close to climo. 9.3" on the season and modern climo maps tag this elevated area with 13" around smith mtn. I still give this winter a B-B+ grade based mostly on the feels. Multiple cold events, plenty of snow cover days, and lots of fun tracking.  If i can hit 13" it's an A-. Below norm DJF with multiple events it's not normal or average. It's pretty rare. 

We pulled a 2 yesterday and 1.5 this AM up here in Forest. Fine high ratio powder this AM that melted at the first crack of sun. 3.5 total not too shabby. 

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