
SnowGoose69
Professional Forecaster-
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Everything posted by SnowGoose69
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Its got a flukey secondary surface reflection though in the IVT off NJ...18Z RGEM had that too and I think both runs overdid QPF as a result....it can happen though, its just hard to assume at 80 hours out it does but little surface lows forming within the IVT or along a boundary can tick the QPF up enough to matter
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It was a Miller B digger that was supposed to re-develop and did not dig enough Models were notorious for blowing those into the middle or even later 90s. They either would over dig the shortwave or just over bomb the surface low too early when the trof reached the MA so we had a ton of overblown snow forecasts that never happened. This one was the latter more so, it did not dig enough and the low tracked overhead. 2/16/97 is the last instance I remember of models botching one, the ETA became a good fail safe at not screwing them up and the Euro began to get increasingly used more after March 93 by the US forecasters so those busts sort of fell off the radar after the early 90s mostly
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It was a DC/BWI/IAD/ILG snow event they had 3-7 inches and we saw nothing due to similar confluence issues in Canada. My memory is models showed nothing here but parts of SNJ and SE PA got nothing and were forecast to see several inches. Just 2 nights later we were supposed to see 4-8 and got 20 minutes snow, went to rain and it ended
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Honestly just dying in 6 and going dormant is fine...PNA looks positive and AO might head negative...you just don't want it to re-emerge again strongly in 3-4-5
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There are many cases of SW-NE moving weak forcing events which overperformed in DCA/BWI and zonked out here...some have even done the reverse....1/19/02 is a good example of one that pulsed over DCA they had 5-10 inches and here we got the generally forecast 2-3...there are many others too but that one stands out for sure. 12/90 is one that did the opposite, it badly disappointed down there and pulsed up here and we saw 5-8.
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HREF mean was fairly close in the end. We simply failed on the upside potential which I felt was good as models tend to underdo WAA snows in weak setups like this...that idea worked in PHL/BWI but not here
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I still lean at the moment to the metro finishing below normal minus a KU somewhere. I would guess NYC finishes around 15 or so inches right now...pattern should be pretty decent into early March, thereafter I always assume nothing because climo after 3/10 really argues snows are unlikely outside of interior areas
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It'll be north of where currently shown, you can count on that much...not sure I have seen one not go north over time
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The darn NavGEM has a bigger storm than the Euro, much as it did a few days ago for this....I have to think maybe the fast flow is causing the Euro to have more issues than it typically does in these patterns....ordinarily -NAO/west ridge and east trof/phasing type east coast system in an El Nino year it has historically beaten the CMC/GFS but the crazy Pac flow probably is what is partially responsible for its performance today from 72-96 out and likely again Friday unless its gonna score a W but its an outlier now.
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Seems to me we had a rare case where high res models overestimated the WAA induced QPF overnight....usually its the reverse that happens but probably due to the overall setup being weak we had a less common case where they overdid things.
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I'll predict now CPK gets more snow Friday than they did today...that was something I would not have been bold enough to say 18 hours ago.
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Basically it was too late a developing surface low so you can effectively torch the mid levels with the WAA before the system deepens...we've seen more of these sort of setups the last 10 years, they were fairly rare prior to that...usually if a surface low developed in what was not a true Miller B situation off NC it would effectively be a case where cold air stayed locked in at all levels but we've seen more of these benchmark tracks or CLOSE to benchmark tracks with warm air at 925 lately
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I think it will but there will be a short time where probably areas near Staten Island east across the metro go very light or shut off
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I think the TAFs are a tad too fast at the airports...RASN at LGA by 12Z just seems crazy to me...I'd say PLSN or FZRAPL by 14-15Z makes more sense. The TAFs tend to be automated these days now anyway so often they can disagree with the grids
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Models have been fairly good now for about 25-30 years on that...pre ETA days before 1994 you often smoked cirrus but once the grid resolution began increasing that became way less an issue.
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Its more the main mechanism to get precip here won't start to move north for a bit...I'd say 830-9pm it begins but this front running area was always expected to mostly miss..you should begin to start seeing the area down in N VA and the Delmarva accelerate due north in the next 1-2 hours
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