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February 4th-6th Storm Threat Discussion


Sn0waddict

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So snowgoose69 in your honest opinion to do you think Western Nassau county like a 1/2 mile south of the lie ever goes over to plain rain and temp goes above 32..

It's 50/50 but now every model except the 4km nam shows us above freezing at 850mb and the surface. 850s are a given tho.

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So snowgoose69 in your honest opinion to do you think Western Nassau county like a 1/2 mile south of the lie ever goes over to plain rain and temp goes above 32..

 

Perhaps at the very end after 15Z but I'm still uncertain about what happens between 04z-10z, if we get somehow get 5-7 inches of snow or we get 1-2 hours of snow then 5 hours of sleet...history argues against long duration sleet events here unless you have a coastal low close by which we do after 12Z but not before that, its rare to see long duration sleet here in WAA ahead of system even if the thermal profile is dangerously close to being over 0C in a layer...generally in this region if the sounding is a borderline sleet/snow sounding we tend to verify on the snow side most of the time but the WAA is so damn strong in this thing I'm not so sure it won't happen.

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These are the highest temps on the 4k NAM , Temps in MC and Long Island drop back to 32 the very next hour .

Extreme Suffolk county stays around 34 , but its 0C on Long Island on west

So whaddaya think PB, can we pull off a mostly snow to sleet with minimal ZR? I hate ice with a purple passion...WWOR ( I don't like the station but caught the weather this morning ) says 1-3 then rain...6 in the northern areas.

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So whaddaya think PB, can we pull off a mostly snow to sleet with minimal ZR? I hate ice with a purple passion...WWOR ( I don't like the station but caught the weather this morning ) says 1-3 then rain...6 in the northern areas.

I think there`s rain in MC after 2- 4 , I don't see a deep layer of Cold air on the Coast  . Plus 4 air at 850 with the surface at 0  smells more wet than white to me in the end . Temps prob find there way to 33- 34 S of 78   .

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I think there`s rain in MC after 2- 4 , I don't see a deep layer of Cold air on the Coast  . Plus 4 air at 850 with the surface at 0  smells more wet than white to me in the end . Temps prob find there way to 33- 34 S of 78   .

Mt Holly says 3-5, Upton say 1-2. Both hedge bets in their discussions: I'm on the cusp of both stations. Mt Holly discussion notes they are putting the freezing rain front and center because if you don't, basically it's too late once it starts.

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Is the 6z NAM concerning to anyone?  Wow is it warm...

WPC notes this

 

MODEL DIAGNOSTIC DISCUSSION

NWS WEATHER PREDICTION CENTER COLLEGE PARK MD

324 AM EST TUE FEB 04 2014

VALID FEB 04/0000 UTC THRU FEB 07/1200 UTC

...SEE NOUS42 KWNO (ADMNFD) FOR THE STATUS OF THE UPPER AIR

INGEST...

==============================================

FINAL 00Z MODEL EVALUATION AND PREFERENCES

==============================================

NAM/GFS INITIALIZATION ERRORS DON'T APPEAR TO

SIGNIFICANTLY AFFECT THEIR LARGE SCALE OUTPUT.

==============================================

...SHORTWAVE EJECTING FROM THE SOUTHWEST TO THE NORTHEAST TUE

MORNING-WEDNESDAY NIGHT...

PREFERENCE: GFS/ECMWF

CONFIDENCE: AVERAGE

NO SIGNIFICANT RUN-TO-RUN CHANGES WERE NOTED IN THE NAM SINCE 00Z.

THE GFS HAS TRENDED A LITTLE DEEPER WITH THE INITIAL SURFACE

SURFACE LOW LIFTING FROM THE TN VALLEY TO THE CENTRAL APPALACHIANS

TUE NIGHT-WED MORNING. OVERALL THE MODELS ARE FAIRLY WELL

CLUSTERED AT 500MB-SURFACE THROUGH WED BUT SUBTLE DIFFERENCES

REMAIN. ONE OF THE MORE NOTED DIFFERENCES IS THAT THE NAM IS

FASTER TO LIFT THE INITIAL LOW NORTHWARD INTO THE TN VALLEY TUE

EVENING AND FROM THERE TRACKS THE LOW A LITTLE FURTHER WEST

THROUGH THE OH VALLEY WED MORNING THAN THE CURRENT MODEL

CONSENSUS.

 

http://www.wpc.ncep.noaa.gov/discussions/hpcdiscussions.php?disc=pmdhmd

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WPC notes this

 

MODEL DIAGNOSTIC DISCUSSION

NWS WEATHER PREDICTION CENTER COLLEGE PARK MD

324 AM EST TUE FEB 04 2014

VALID FEB 04/0000 UTC THRU FEB 07/1200 UTC

...SEE NOUS42 KWNO (ADMNFD) FOR THE STATUS OF THE UPPER AIR

INGEST...

==============================================

FINAL 00Z MODEL EVALUATION AND PREFERENCES

==============================================

NAM/GFS INITIALIZATION ERRORS DON'T APPEAR TO

SIGNIFICANTLY AFFECT THEIR LARGE SCALE OUTPUT.

==============================================

...SHORTWAVE EJECTING FROM THE SOUTHWEST TO THE NORTHEAST TUE

MORNING-WEDNESDAY NIGHT...

PREFERENCE: GFS/ECMWF

CONFIDENCE: AVERAGE

NO SIGNIFICANT RUN-TO-RUN CHANGES WERE NOTED IN THE NAM SINCE 00Z.

THE GFS HAS TRENDED A LITTLE DEEPER WITH THE INITIAL SURFACE

SURFACE LOW LIFTING FROM THE TN VALLEY TO THE CENTRAL APPALACHIANS

TUE NIGHT-WED MORNING. OVERALL THE MODELS ARE FAIRLY WELL

CLUSTERED AT 500MB-SURFACE THROUGH WED BUT SUBTLE DIFFERENCES

REMAIN. ONE OF THE MORE NOTED DIFFERENCES IS THAT THE NAM IS

FASTER TO LIFT THE INITIAL LOW NORTHWARD INTO THE TN VALLEY TUE

EVENING AND FROM THERE TRACKS THE LOW A LITTLE FURTHER WEST

THROUGH THE OH VALLEY WED MORNING THAN THE CURRENT MODEL

CONSENSUS.

 

http://www.wpc.ncep.noaa.gov/discussions/hpcdiscussions.php?disc=pmdhmd

Thanks DM.  Seems the time stamp takes into considerationt the 6z run.  Just fearing the ice, ice baby...

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UPTON ,

 

PCPN IS EXPECTED TO BEGIN LATE THIS EVENING AND INITIALLY MOSTLY
EVERYONE SHOULD START AS SNOW. AS THE NIGHT PROGRESSES WARMER AIR
ALOFT WILL WORK IN WITH SNOW CHANGING TO SLEET AND FREEZING RAIN
FROM S TO N. THIS IS THE MOST CHALLENGING PART OF THE FORECAST AND
WHERE HIGH BUST POTENTIAL LIES. EVENTUALLY...SOME COASTAL
LOCATIONS WILL LIKELY CHANGE OVER TO PLAIN RAIN...BUT TIMING OF
ALL OF THIS IS HIGHLY UNCERTAIN.

HAVE CONVERTED ALL WATCHES TO WARNINGS...EXCEPT FOR SOUTHERN
NASSAU AND SOUTHWEST AND EASTERN SUFFOLK. DO NOT THINK THE
COMBINATION OF SNOW AND ICE WILL MEET WARNING CRITERIA HERE...SO
HAVE OPTED FOR AN ADVISORY. THESE HEADLINES MAY NEED TO BE
ADJUSTED LATER TODAY DEPENDING ON THE 12Z MODEL SUITE. ACROSS THE
INTERIOR...EXPECT 6-10 INCHES OF SNOW WITH A TENTH OF AN INCH OF
ICE. MOST OF NE NJ...NYC AND COASTAL CT WILL SEE BETWEEN 2 AND 8
INCHES OF SNOW...HIGHEST AMOUNTS NORTH...WITH UP TO 1/4 INCH OF
ICE. IT IS THIS COMBO THAT HAS PROMPTED THE WARNING...ALTHOUGH
SOME AREAS WILL NOT REACH THE 6 INCH SNOWFALL IN 12 HOURS CRITERIA.
LONG ISLAND WILL SEE ANYWHERE FROM 2 TO 6 INCHES...AGAIN HIGHEST
N...WITH UP TO 1/10 INCH OF ICE...MAINLY IN WESTERN LOCATIONS.

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