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February 13/14 VD Storm discussion


Bostonseminole

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So what's the euro printing out?

 

The low res maps are tough but you have to be around .1 I'd think.  if not .125 or so.

 

The problem is going to be it's mainly that band producing the snows.  It'll take the redevelopment to fill in precip to the se of it as it approaches the Jersey coast later....and that's the rub.

 

We will have to wait and see.

 

CMH090-L.jpg

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i thought the GGem looked pretty good for the south coast and CC

 

It does.

 

The crazy NAM band last night...has me thinking.  I mean it's clear to me now what it was trying to do.  It was probably wrong, but it will be more interesting if in 5-6 hours we're still looking at an intense band moving across PA. 

 

You can see what it was/is trying to do.

 

http://weather.rap.ucar.edu/satellite/displaySat.php?region=DTW&itype=wv&size=large&endDate=20130213&endTime=-1&duration=4

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It does.

 

The crazy NAM band last night...has me thinking.  I mean it's clear to me now what it was trying to do.  It was probably wrong, but it will be more interesting if in 5-6 hours we're still looking at an intense band moving across PA. 

 

You can see what it was/is trying to do.

 

http://weather.rap.ucar.edu/satellite/displaySat.php?region=DTW&itype=wv&size=large&endDate=20130213&endTime=-1&duration=4

Time will tell.............my 2-4 is going to bust big time here, I always said I loved the look at h7 and that it argued for a good band to the north and west of the low pressure.  Hoping for a covering to an inch if the bl allows.

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On any given day, this band would hit the HFD to BOS on south area pretty good. It bothers me the many models crap this out. The only one sort of hanging on is the RAP....but this tends to be a wee bit overamped. We'll see...it was actually too far SE with the storm last week.

the rap is bullish run after run. it'll probably come back to earth...but think this is close enough for 1-3 out here...most by the elbow.

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Not totally writing this off only because I don't see how the radar can have that band and the models be spitting out the QPF that they are. My 2-4" lollies to 5" is going to bust in a bad way, but I think that band still might be able to put down a coating to an inch here, assuming it holds.

-skisheep

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Meh worrying about model QPF.  Why not look at what's been going on in IN and OH where NWS has been playing catchup all morning based on those same lousy models?

 

They just had to issue a WWA in OH where the Euro had basically nothing just 12 hours ago and very little even at 12z, lol.

 

".NEAR TERM /UNTIL 6 PM THIS EVENING/...
STILL PLAYING CATCHUP THIS MORNING. GETTING REPORTS OF BAND OF
SNOW MOVING THRU THE TRI-STATE DROPPING 1 TO 3. ISSUED ADVISORY
ACROSS THE SRN COUNTIES. HAVE IT UNTIL 2 PM IN THE WRN HALF AND 6
PM FOR THE E."

 

They got some good banding from Columbus east and south that was pretty well botched by the Euro and others.  All we can do is hope that translates.

 

http://radar.weather.gov/radar.php?rid=ILN&product=N0R&overlay=11101111&loop=yes

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Missed this gem. LOL
 
 

.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/...
TONIGHT...
SHORTWAVE MOVES ACROSS THE MID ATLANTIC AND NEW ENGLAND COASTS.
ALL MODELS TAKE THE ASSOCIATED SURFACE LOW WELL SOUTH OF NEW
ENGLAND. THE NAM IS FARTHEST NORTH...AT 39N...WHILE THE GFS AND
ECMWF ARE CLOSER TO 38N. THE 03Z SREF IS SOUTH OF THE NAM BUT
NORTH OF THE GFS/ECMWF. THE SURFACE LOW IS SUPPORTED BY A PAIRED
JET STRUCTURE...RIGHT ENTRANCE OF ONE JET LEADING AND LEFT EXIT
REGION OF THE SECOND TRAILING...BUT MOST OF THIS IS FOCUSED OVER
THE FISH.


WE FAVOR THE SOUTHERN GFS/ECMWF SOLUTION. THIS BRINGS PCPN INTO CT
DURING THE EARLY NIGHT AND HAS THE HEIGHT OF PCPN AROUND
MIDNIGHT...THEN MOVES PCPN OFFSHORE BY MORNING. QPF IS A BLEND OF
THE NE RFC VALUES AND HPC VALUES. THIS BRINGS AROUND 0.15 INCHES
OF QPF TO THE SOUTH COAST AND A NORTHERN EDGE TO MEASURABLE PCPN
AROUND THE MASS PIKE. THIS WOULD CONTINUE TO SUPPORT 1-2 INCHES IN
PARTS OF EASTERN CT/SRN RHODE ISLAND/SOUTHEAST MASS WITH
DIMINISHING VALUES TO THE NORTH...ALTHOUGH THE CT/RI BORDER HILLS
MAY OFFSET THE DIMINISHING VALUES. CLIMATOLOGY FOR THE STORM TRACK
WOULD POINT TO MAXIMUM PCPN ACROSS THE ISLANDS AND SOUTH COAST
WATERS...AND POSSIBLY ALONG THE IMMEDIATE SOUTH COAST.
 

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Radar not far off from the 12z NAM forecast. Below image shows how precip is modeled to reach northern PA, but then hits the Apps (as we've seen so many times in the past) and has trouble making it into SNE. 

Courtesy: PSU Meteorology

rad12.gif

 

It's better than most but I'd argue 3-6 hours it was probably a few miles too south with the heavier band.  

 

The mountains will eat that NW shield to some/all extent.  The energy will remain though and it appears it's the interaction with the offshore low that the RAP/NAM/NAM4km are picking up on.  on those models it's just enough to help lift precip into the region and they all smack SE areas pretty good.

 

It's a pretty good bust so far today in the OH Valley on the right side for a change but that doesn't mean it has to continue east.    We'll see, but interesting. 

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Quincy nice catch, I hadn't really looked at the 4km.  Mainly because...I figure the 18z should tell the tale one way or the other.  At 12-15 the new Euro kills that band.  The NAM on the other hand kept enough of a pull north to help enhance precip with the developing low.  The result is below.

 

I'd "think" that a stronger/NW presentation that's caught many offices off guard to our west SHOULD bode well east, but maybe not.

 

nam-hires_namer_018_sim_reflectivity.gif

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Now or never on the NAM.  The system looks pretty decent, just starting to see the shift now east/falling apart of that band in OH.  Compromise is probably the smart way to go for the time being, but if the NAM ever were to come in more amped/the same be hard pressed not to buy it.

 

On the road for a bit, hopefully someone can post up the NAM.

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