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NYC Jan 11-12 Miller B Thread Part 2


am19psu

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The models are handling the midwestern closed low quite well and the surface low passed just to east of buoy 41013, so its tucked in along the western periphery of solutions, don't know what would amount to as a bust in your eyes, but I feel pretty confident about us reaching warning criteria in most of our counties.

For those of you out on the ledge about the storm "going east!" I'd suggest reading Rainshadow's (Tony from NWS-Mt. Holly) recent post, above, as well as their 7:55 am update:

.NEAR TERM /THROUGH TONIGHT/...

-- Changed Discussion --THROUGH THE 12Z OBS, A EURO AND CAN GGEM COMBO IS WORKING THE BEST

WITH THE DEVELOPING SFC LOW, TUCKED IN CLOSER TO THE COAST THAN

THE OTHER MODELS. AT 500MB ITS ABOUT THE SAME, NOT MUCH OF A

DIFFERENCE BUT THE FORMER IS CLOSEST. ALL THE MODELS ARE HANDLING

THE MIDWESTERN CLOSED LOW EQUALLY AND QUITE WELL. LAST WALLOPS IS

ALREADY UP TO +1C AT 850MB, ALL OF THE MODELS WERE TOO COLD WITH

THEIR FCST 850MB TEMPS, WITH THE GFS THE CLOSEST. THIS ADDS THE

POSSIBILITY OF MORE NON SNOW PTYPE ISSUES ALONG OUR COAST. NO

CHANGES FOR NOW WILL HAVE THE FIRST 24HRS IN ON BOTH MODELS FOR

THE 11 AM UPDATE.

IT WOULD APPEAR AS THOUGH THE WARM LAYER SEEN ON THE 0000 UTC

KGSO AND KMHX SOUNDINGS HAS SLIPPED NORTH INTO SOUTHEAST VIRGINIA

AND THE SOUTHERNMOST DELMARVA PENINSULA. BASED ON THIS...THE

POTENTIAL SLEET WAS INCLUDED IN THE FORECAST FOR PORTIONS OF

EASTERN MARYLAND AND SOUTHERN DELAWARE AS THE PRECIPITATION GETS

STARTED.

PUTTING THE REMAINING PIECES OF THE PUZZLE TOGETHER THIS

MORNING... THE REMAINDER OF THE DELAWARE VALLEY CURRENTLY IN THE

WATCH WILL BE UPGRADED TO WINTER STORM WARNING...AS WILL NORTHWEST

NEW JERSEY AND COASTAL OCEAN COUNTY NEW JERSEY.

THE EASTERN MARYLAND COUNTIES CURRENTLY IN THE WATCH WILL BE

CONVERTED TO WINTER WEATHER ADVISORIES. EASTERN SUSSEX COUNTY

DELAWARE...AS WELL AS COASTAL SECTIONS OF CAPE MAY AND ATLANTIC

COUNTIES WILL BE SWITCHED TO WINTER WEATHER ADVISORIES...AS WILL THE

LEHIGH VALLEY AND SOUTHERN POCONOS.

THE INGREDIENTS FOR A SIGNIFICANT WINTER WEATHER EVENT ARE COMING

TOGETHER THIS MORNING. A STRONG LOW LEVEL BAROCLINIC EXTENDS FROM

NORTHEAST TEXAS TO THE NORTH/SOUTH CAROLINA BORDER. THE SOUTHERN JET

STREAK IS ABOUT 3 TO 6 HOURS AHEAD OF THE NORTHERN JET STREAK

LOCATED OVER MISSOURI. ON THE EASTERN EDGE OF THE BAROCLINIC

ZONE...THERE ARE SIGNS THAT A SURFACE LOW IS TRYING TO ORGANIZE OFF

THE SOUTH CAROLINA COAST. THIS LOOKS TO THE THE SYSTEM THAT WILL

DEEPEN RAPIDLY ONCE IT GETS TO OUR LATITUDE AND FURTHER NORTHEAST.

FOR THE MOST PART...IT WOULD APPEAR AS THOUGH THE PHASING OF THE TWO

SHORT WAVES WILL OCCUR JUST AS IT REACHES OUR LATITUDE. THIS PUTS THE

FORECAST AREA IS A TRANSITION ZONE...AS SOUTHWEST PORTIONS OF THE

AREA ON THE BACK SIDE OF THE MOISTURE...AND NORTHEAST AREAS JUST

GETTING INTO THE BEST LIFT AND DYNAMIC COOLING AS THE SYSTEM STARTS

TO PULL OUT WEDNESDAY MORNING.

THE DRY AIRMASS IN PLACES SHOULD SLOW THE NORTHEAST PROGRESSION OF

THE PRECIPITATION SHIELD LATER THIS MORNING AND THIS AFTERNOON. WITH

MID LEVEL RIDGING JUST EXITING...SOME PORTIONS OF THE AREAS

(PARTICULARLY NORTHEAST) MAY EVEN SEE SOME SUNSHINE EARLY. AFTER

THIS...THE WARM AIR ADVECTION AHEAD OF THE NORTHERN SHORT WAVE

SHOULD MOISTENING THE COLUMN DURING THE AFTERNOON.

THE LEADING EDGE OF THE STEADIER PRECIPITATION SHOULD GET INTO

DELAWARE AND EASTERN MARYLAND DURING THE AFTERNOON...REACHING A

KPHL-KACY LINE BY ABOUT 600 PM. STRONG WARM AIR ADVECTION SHOULD

ALLOW THE SNOW TO INCREASE IN INTENSITY FAIRLY QUICKLY AFTER IT

STARTS. IT APPEARS AS THOUGH 1 TO 3 INCHES OF SNOW COULD FALL ACROSS

EASTERN MARYLAND AND PORTIONS OF DELAWARE BEFORE DARK.

THE AIRMASS HAS NOT CHANGED MUCH IN THE LAST COUPLE OF DAYS...SO

HIGHS TODAY SHOULD BE CLOSE TO WHERE THEY HAVE BEEN THE LAST 2 DAYS.

THE EXCEPTION HERE IS ALONG THE COAST. AS THE SURFACE HIGH FINALLY

GETS OFFSHORE THIS MORNING...THE RETURN FLOW AROUND THE HIGH WILL

TURN THE BOUNDARY LAYER FLOW ONSHORE.

WITH SEA SURFACE TEMPERATURES AROUND 40...AND AIR TEMPERATURES OVER

THE WATERS THIS MORNING IN THE LOWER 30S...HIGHS ALONG THE COAST

SHOULD GET ABOVE FREEZING. THIS SETS THE STAGE FOR A PRECIPITATION

TYPE PROBLEM. AS THE PRECIPITATION STARTS...EVAPORATIVE COOLING

SHOULD ALLOW THE PRECIPITATION TO START AS SNOW...BUT ONCE THIS IS

USED UP...THE BOUNDARY LAYER WARMS BACK ABOVE FREEZING. THIS SHOULD

CHANGE THE PRECIPITATION ALONG THE IMMEDIATE COAST TO RAIN.-- End Changed Discussion --

http://forecast.weat...=1&highlight=on

One more point: I would imagine that if mixing/rain are issues along the immediate Jersey Shore, then the same may be true for at least the eastern parts of LI. This is not a forecast, just an observation that things often work out that way...

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Yet again? When was the last time we were the jackpot? Certainly not last year...

OKX always has the highest totals on Long Island-- or at least more often than not. This was already discussed a few days ago. Specifically, with regards to last winter, they had the highest totals on Long Island in the Dec 19. 2009 storm. I didnt mean the have the highest totals in the metro area, I meant they usually have the highest totals of any place on Long Island.

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12z NAM totals:

LGA: 1.22"

JFK: 1.32"

NYC: 1.12"

EWR: .93"

ISP: 1.75"

OKX: 1.87"

HPN: 1.38"

BDR: 1.87"

that is .34 more for JFK than 12/26...i wonder how this is going to play out...

anyone have any idea what the avg qpf output was for JFK the day before the storm (say 12Z or 18Z saturday)....thanks.

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that is .34 more for JFK than 12/26...i wonder how this is going to play out...

anyone have any idea what the avg qpf output was for JFK the day before the storm (say 12Z or 18Z saturday)....thanks.

The difference was that it was colder before and during that storm.

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that is .34 more for JFK than 12/26...i wonder how this is going to play out...

anyone have any idea what the avg qpf output was for JFK the day before the storm (say 12Z or 18Z saturday)....thanks.

We might actually get to see thundersnow this time!

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The difference was that it was colder before and during that storm.

Barely. Neither airmass is arctic but if anything this seems like a colder storm to me, at least for LI. We mixed with sleet on 12/26, something i don't expect to happen with this one for any appreciable amount of time. (for north shore and areas west of the forks)

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I cant stay up all night with work in the morning :axe:

Yeah, Im hoping it lasts into the morning, but the NAM wont play nice with us :( This is why I dont rank the 12/19 storm from last winter on our top 10 list. When I woke up the snow was winding down lol.

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RGEM shifted the QPF east. It matches SREFS.

NYC is 15-20mm .60"-.75"

Suffolk County is over 1.25"

That is a big cutdown off of 6z and 0z RGEM.

i think the track and overall qpf look good. I also cang get a good total from the canadian web site maps. Wait for the metrocentre maps, which were more telling 00 and 06z for those west of NYC.

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