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March 25th OBS Thread


Guest Patrick

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Getting nothing here but too be honest a total miss would be fine with me. It's March 25th and we've had an average season so far. 2/5/2010 hurt because 1) It was early February and 2) Places from Philly on south got hammered. Nobody is missing anything to great today.

Yeah given the time of the year and the winter we've had I can't see to many people being overly upset about missing this one. Whether you get a dusting or 2" its going to be gone by tomorrow anyway

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Coastal down to 989. Still moving slightly northward. That low is going to have to make it 75 miles further north at that lattitude to bring the goods.

 

pchg.gif?1364229325705

From the position of the low it really ridiculous that we aren't seeing more precip. Making it to nyc proper.

I wish someone would explain how confluence works and how it's stomping all over our wanna be snowstorm, it's very frustrating having cold (enough) air , good low position , still not delivering though, anybody out there to explain confluence.? Thanks.

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It's very simple, look at the water vapor loop. You can see the confluince from the ULL east of Maine pushing down on everything. The moisture tries to advect northward but hits a brick wall. Also there is some subsidence occuring as the deformation banding begins to take over offshore. This all translates to a bad combination for us.

 

FWIW the latest HRRR continues to tick every so slightly furthern north.

 

From the position of the low it really ridiculous that we aren't seeing more precip. Making it to nyc proper.
I wish someone would explain how confluence works and how it's stomping all over our wanna be snowstorm, it's very frustrating having cold (enough) air , good low position , still not delivering though, anybody out there to explain confluence.? Thanks.

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Any accum left in Freehold? The Rt79 and 9 webcam looked like 1 or 2" after that heavy band went through this morning.

Yea still measuring about 1/2" on cold surfaces, precip and flake size are starting to increase..

 

http://ne1-attach.ymail.com/us.f1205.mail.yahoo.com/ya/securedownload?mid=2_0_0_1_8000368_APNVimIAADo4UVB%2Fhw3nilaOYS8&pid=1&fid=Inbox&inline=1&cred=xI_J2HDUyDHakPm57czVL0Wyk_PNckYBISTKeTUjgyhSBkk-&ts=1364230114&partner=ymail&sig=Aaya2fXhX70IUbe7VOJJlQ--

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From the position of the low it really ridiculous that we aren't seeing more precip. Making it to nyc proper.

I wish someone would explain how confluence works and how it's stomping all over our wanna be snowstorm, it's very frustrating having cold (enough) air , good low position , still not delivering though, anybody out there to explain confluence.? Thanks.

Here's my hobbyist take on it:

 

It is all about strength and positioning of all the players. The 500 low needs to typically close off further north in a flow like this imho and it has to be a powerful enough closed vort to make a push into that flow. It appears to me we have neither at H5. The confluence is not just a steering mechanism due to it's far south and east positioning either it also drains very dry air into the storm dissolving the good precipitation bands hence not amounting to much. In the map you are asking about you see a 989 surface low, well that's just not strong enough to combat this particular amount and location of confluence.

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Confluence can be a huge help or a killer depending on where you end up.

The positive of a confluence zone is that it does not allow a storm to easily cut north and west, lake cutters have little confluence to contend with so they amplify and cut.

The negative is obviously what we are dealing with today, think of it as a massive area of subsidence and a true wall that blocks moisture. If positioned close enough to the storm, you could see significant banding snow, but if your too far away then it could be dry, cloudy, flurries, or even some sun poking through.

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From the position of the low it really ridiculous that we aren't seeing more precip. Making it to nyc proper.

I wish someone would explain how confluence works and how it's stomping all over our wanna be snowstorm, it's very frustrating having cold (enough) air , good low position , still not delivering though, anybody out there to explain confluence.? Thanks.

As air aloft comes from the SW near where our low is, it is combining with dry air aloft flowing from the NW around the block, which is positioned too far SW. The combination of the SW flow and NW flow causes sinking air, which is essentially what confluence is. That's why storms that occur when there are huge blocks have such sharp precip cutoffs, and why lows have to go around blocks instead of through them. The steering flow is going to turn from west to east soon around the low and it will head ENE, then due east.

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Confluence can be a huge help or a killer depending on where you end up.

The positive of a confluence zone is that it does not allow a storm to easily cut north and west, lake cutters have little confluence to contend with so they amplify and cut.

The negative is obviously what we are dealing with today, think of it as a massive area of subsidence and a true wall that blocks moisture. If positioned close enough to the storm, you could see significant banding snow, but if your too far away then it could be dry, cloudy, flurries, or even some sun poking through.

Right, EWR is up to 38 and raining now. TEB and Sussex are in the low 40s and cloudy. I'm at 33-34 with moderate snow.

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I see PNS Mt holly has 2.1" for Cream Ridge and 1.5 in Hamilton. Were you able to confirm these in the boro? Im in somerset at work with no one home to do measurements. Thanks.

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I see PNS Mt holly has 2.1" for Cream Ridge and 1.5 in Hamilton. Were you able to confirm these in the boro? Im in somerset at work with no one home to do measurements. Thanks.

No, the precip in the morning was heaviest just to the south, i seen someone in jackson report about 2"..We are getting close to 3/4" but snow has really picked up..

 

I will add that i woke up late this morning, so some melting could of occurred..

 

 

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

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At 1:16 pm, NWS-Philly just reiterated the WWAdvisory for most of Central/North Jersey.  Very surprised given trends so far.  Nothing on the ground in northern Middlesex County and it's light rain 9 miles north of there in Rahway, where they've discontinued the WWA.  Maybe I'm just missing something. 

 

URGENT -URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
116 PM EDT MON MAR 25 2013

...LATE MARCH SNOWSTORM IN PROGRESS FOR THE MID ATLANTIC STATES...

.LOW PRESSURE ALONG THE MID ATLANTIC COAST WILL CONTINUE INTENSIFYING
AS SLOWLY MOVES OUT TO SEA SOUTH OF CAPE COD TONIGHT.

NJZ008>010-012-013-015-PAZ105-106-260130-
/O.CON.KPHI.WW.Y.0019.000000T0000Z-130326T0400Z/
MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-WESTERN MONMOUTH-MERCER-
UPPER BUCKS-LOWER BUCKS-
INCLUDING THE CITIES OF...MORRISTOWN...FLEMINGTON...SOMERVILLE...
NEW BRUNSWICK...FREEHOLD...TRENTON...CHALFONT...PERKASIE...
MORRISVILLE...DOYLESTOWN
116 PM EDT MON MAR 25 2013

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT EDT
TONIGHT...

* LOCATIONS...BUCKS COUNTY IN PENNSYLVANIA... AS WELL AS PARTS
  OF CENTRAL AND NORTHERN NEW JERSEY.

* HAZARD TYPE...SNOW.

* SNOW ACCUMULATIONS...2 TO 4 INCHES WITH HALF OF THAT SLUSHY
  AMOUNT ON UNTREATED PAVED SURFACES.

 

http://forecast.weather.gov/showsigwx.php?warnzone=NJZ012&warncounty=NJC023&firewxzone=NJZ012&local_place1=&product1=Winter+Weather+Advisory

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