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Wave 1, 1/5-6/17 Discussion/OBS


dmillz25

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5 minutes ago, redbanknjandbigbasslakepa said:

Bottom line is you probably need a nw shift of about 150 miles in about 60 hrs on the mean of the models in order to get a significant snowstorm into Manhattan. Is that possible? Yes. 

Maybe.  I'd say ceiling for NYC now is 3-4.  LI may be another story.

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8 minutes ago, bluewave said:

Yeah, 50 miles would allow the 4" at MTP on the UKMET to back up closer to ISP.

50 mile shift would give everyone much more snow on the Ukmet.

The shift would take place with the surface low near North Carolina. Trajectory would bring in a lot more precip to NYC. It's exponential.

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4 minutes ago, UlsterCountySnowZ said:

51exio.jpgdespite western trends GEFS are ugly... not a single members comes up coast... almost every member looks identical

 

 

The problem when dealing with improving N trend systems they tend to happen over multiple model cycles

 

At 0z last night Salisbury MD had 0 today at 12z there`s 10 now .

gfs_asnow24_neus_8.png

 

0Z

gfs_asnow24_neus_11.png

 

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Just now, bluewave said:

The flip side of that will be a sharp cut off to the west with such dry air in place.

Dewpoints will be in the single digits.


KJFK   GFS MOS GUIDANCE    1/05/2017  1200 UTC                      
 DT /JAN   5/JAN   6                /JAN   7                /JAN   8 
 HR   18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 06 12 
 N/X                    31          38          21          28    20 
 TMP  34 34 33 33 34 34 33 33 35 35 31 28 25 23 22 24 26 26 24 24 20 
 DPT   6  7 10 13 18 20 20 19 18 15 12  9  6  6  6  8  9 10 11  7  4 

Agree ,

 

Arctic waves favor the coast .

 

These are painful for N and W peeps. 

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3 minutes ago, bluewave said:

Yeah, the MA is going to be the jackpot zone on this. May be the best La Nina January snowfall for that section of the country since the 12/25/00 surprise snowstorm.

Yeh there could some 20 inch amounts showing up there . 

 

gfs_apcpn_seus_9.png

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1 hour ago, dmillz25 said:

Ok I shall make this the 2 wave discussion thread. CMC at h5 looks better just didn't translate to the surface.

Sorry, but this thread is now very difficult to follow, as a large % of posters aren't specifying which system they're talking about - should be separate threads for the separate events.  

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Just now, RU848789 said:

Sorry, but this thread is now very difficult to follow, as a large % of posters aren't specifying which system they're talking about - should be separate threads for the separate events.  

Everyone is talking about wave 2 at the moment. They'll mention wave 1 when the model runs come out

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URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1113 AM EST THU JAN 5 2017

...LIGHT SNOW TO AFFECT THE AREA TONIGHT...

DEZ001-MDZ008-012-NJZ012>027-PAZ070-071-101-102-104-106-060415-
/O.NEW.KPHI.WW.Y.0001.170106T0100Z-170106T1100Z/
NEW CASTLE-CECIL-KENT MD-MIDDLESEX-WESTERN MONMOUTH-
EASTERN MONMOUTH-MERCER-SALEM-GLOUCESTER-CAMDEN-
NORTHWESTERN BURLINGTON-OCEAN-CUMBERLAND-ATLANTIC-CAPE MAY-
ATLANTIC COASTAL CAPE MAY-COASTAL ATLANTIC-COASTAL OCEAN-
SOUTHEASTERN BURLINGTON-DELAWARE-PHILADELPHIA-WESTERN CHESTER-
EASTERN CHESTER-EASTERN MONTGOMERY-LOWER BUCKS-
INCLUDING THE CITIES OF...WILMINGTON...ELKTON...CHESTERTOWN...
NEW BRUNSWICK...FREEHOLD...SANDY HOOK...TRENTON...PENNSVILLE...
GLASSBORO...CAMDEN...CHERRY HILL...MOORESTOWN...MOUNT HOLLY...
JACKSON...MILLVILLE...HAMMONTON...CAPE MAY COURT HOUSE...
OCEAN CITY...ATLANTIC CITY...LONG BEACH ISLAND...
WHARTON STATE FOREST...MEDIA...PHILADELPHIA...HONEY BROOK...
OXFORD...WEST CHESTER...KENNETT SQUARE...NORRISTOWN...LANSDALE...
MORRISVILLE...DOYLESTOWN
1113 AM EST THU JAN 5 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO
6 AM EST FRIDAY...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER
WEATHER ADVISORY FOR SNOW...WHICH IS IN EFFECT FROM 8 PM THIS
EVENING TO 6 AM EST FRIDAY.

* LOCATIONS...NORTHEASTERN MARYLAND, NORTHERN DELAWARE,
  SOUTHEASTERN PENNSYLVANIA, AND SOUTHERN AND CENTRAL NEW JERSEY.

* HAZARD TYPES...SNOW

* SNOW ACCUMULATIONS...1 TO 3 INCHES...WITH LOCALLY HIGHER
  AMOUNTS TO 4 INCHES POSSIBLE IN CENTRAL NEW JERSEY

* TIMING...SNOW WILL OVERSPREAD THE AREA FROM WEST TO EAST BETWEEN
  8 PM AND 11 PM THIS EVENING. THE SNOW BECOMES STEADY AND
  MODERATE AT TIMES LATE THIS EVENING AND OVERNIGHT, THEN QUICKLY
  END FROM WEST TO EAST BETWEEN 3 AM AND 6 AM EARLY FRIDAY MORNING.

* IMPACTS...EXPECT HAZARDOUS TRAVEL TONIGHT WITH ROADS BECOMING
  SNOW COVERED. UNTREATED ROADS AND SIDEWALKS MAY STILL BE
  SLIPPERY HEADING INTO THE FRIDAY MORNING COMMUTE EVEN AFTER THE
  SNOW ENDS.

* TEMPERATURES...STEADY IN THE UPPER 20S AND LOWER 30S.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW
WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW
COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE
DRIVING.

REPORT SNOW ACCUMULATION TO THE NATIONAL WEATHER SERVICE BY
CALLING OUR TRAINED SPOTTER LINE...POSTING TO THE NWS MOUNT HOLLY
FACEBOOK PAGE...OR USING TWITTER @NWSMOUNTHOLLY.

SNOWFALL ACCUMULATION FORECAST MAPS IN ADDITION TO EXPERIMENTAL
PROBABILISTIC SNOWFALL INFORMATION FOR THE LATEST EVENT ARE
AVAILABLE ONLINE AT WWW.WEATHER.GOV/PHI/WINTER
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WWA up for central and southern nj

 

 
...LIGHT SNOW TO AFFECT THE AREA TONIGHT...

DEZ001-MDZ008-012-NJZ012>027-PAZ070-071-101-102-104-106-060415-
/O.NEW.KPHI.WW.Y.0001.170106T0100Z-170106T1100Z/
NEW CASTLE-CECIL-KENT MD-MIDDLESEX-WESTERN MONMOUTH-
EASTERN MONMOUTH-MERCER-SALEM-GLOUCESTER-CAMDEN-
NORTHWESTERN BURLINGTON-OCEAN-CUMBERLAND-ATLANTIC-CAPE MAY-
ATLANTIC COASTAL CAPE MAY-COASTAL ATLANTIC-COASTAL OCEAN-
SOUTHEASTERN BURLINGTON-DELAWARE-PHILADELPHIA-WESTERN CHESTER-
EASTERN CHESTER-EASTERN MONTGOMERY-LOWER BUCKS-
INCLUDING THE CITIES OF...WILMINGTON...ELKTON...CHESTERTOWN...
NEW BRUNSWICK...FREEHOLD...SANDY HOOK...TRENTON...PENNSVILLE...
GLASSBORO...CAMDEN...CHERRY HILL...MOORESTOWN...MOUNT HOLLY...
JACKSON...MILLVILLE...HAMMONTON...CAPE MAY COURT HOUSE...
OCEAN CITY...ATLANTIC CITY...LONG BEACH ISLAND...
WHARTON STATE FOREST...MEDIA...PHILADELPHIA...HONEY BROOK...
OXFORD...WEST CHESTER...KENNETT SQUARE...NORRISTOWN...LANSDALE...
MORRISVILLE...DOYLESTOWN
1113 AM EST THU JAN 5 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO
6 AM EST FRIDAY...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER
WEATHER ADVISORY FOR SNOW...WHICH IS IN EFFECT FROM 8 PM THIS
EVENING TO 6 AM EST FRIDAY.

* LOCATIONS...NORTHEASTERN MARYLAND, NORTHERN DELAWARE,
  SOUTHEASTERN PENNSYLVANIA, AND SOUTHERN AND CENTRAL NEW JERSEY.

* HAZARD TYPES...SNOW

* SNOW ACCUMULATIONS...1 TO 3 INCHES...WITH LOCALLY HIGHER
  AMOUNTS TO 4 INCHES POSSIBLE IN CENTRAL NEW JERSEY

* TIMING...SNOW WILL OVERSPREAD THE AREA FROM WEST TO EAST BETWEEN
  8 PM AND 11 PM THIS EVENING. THE SNOW BECOMES STEADY AND
  MODERATE AT TIMES LATE THIS EVENING AND OVERNIGHT, THEN QUICKLY
  END FROM WEST TO EAST BETWEEN 3 AM AND 6 AM EARLY FRIDAY MORNING.

* IMPACTS...EXPECT HAZARDOUS TRAVEL TONIGHT WITH ROADS BECOMING
  SNOW COVERED. UNTREATED ROADS AND SIDEWALKS MAY STILL BE
  SLIPPERY HEADING INTO THE FRIDAY MORNING COMMUTE EVEN AFTER THE
  SNOW ENDS.

* TEMPERATURES...STEADY IN THE UPPER 20S AND LOWER 30S.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW
WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW
COVERED ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE
DRIVING.

REPORT SNOW ACCUMULATION TO THE NATIONAL WEATHER SERVICE BY
CALLING OUR TRAINED SPOTTER LINE...POSTING TO THE NWS MOUNT HOLLY
FACEBOOK PAGE...OR USING TWITTER @NWSMOUNTHOLLY.

SNOWFALL ACCUMULATION FORECAST MAPS IN ADDITION TO EXPERIMENTAL
PROBABILISTIC SNOWFALL INFORMATION FOR THE LATEST EVENT ARE
AVAILABLE ONLINE AT WWW.WEATHER.GOV/PHI/WINTER
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In addition to the WWAdvisories being issued for Middlesex/Mercer/Lower Bucks and everywhere south of there in NJ/SEPA/DE, Mt. Holly had a nice updated AFD talking about mesoscale banding.  As people on this board would likely know, with mesoscale banding, pinpointing the heavier bands is nearly impossible (much like convective t-storms in the summer). In scenarios like this, some small areas (like part of a couple of counties) could get 3-5" of snow, while everyone around them could get 1-3" of snow. 

http://forecast.weather.gov/product.php?site=PHI&issuedby=PHI&product=AFD&format=CI&version=1&glossary=1&highlight=off

.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/...
930 AM Update...We are in the process of analyzing the incoming
12Z model guidance. Hourly temps, PoPs and Wx grids were already
updated for tonight and are included in the 930 AM ESTF. We
anticipate sending out an updated snowfall map and issue any
winter weather advisories before noon. The 12Z NAM, latest RAP and
HRRRx (which goes out far enough to capture the entire event)
indicate a band of heavier snowfall (2-3") that develops late this
evening near the Mason-Dixon line in SE PA/N Delmarva and expands
northeastward into central NJ overnight. We continue to see a
trend to the northwest with the placement of the mesoscale snow
band. Additionally, the models show a local min in precip between
this leading snow band to the north and heavier precip offshore,
which is where we previously forecast the axis of heavier snowfall
to occur. A period of moderate snow on the western edge of the
precip shield from the coastal low may occur late tonight or early
Friday morning over coastal NJ but it`s still a very close call.
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