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March 2-3 Disco, Part III


stormtracker

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Well...that's a difference...

places that flip earlier, may actually get into some banding out ahead of the main push...I don't think the FDK/Westminster crew should be that concerned...Can't speak to Lancaster or Philly but they're in a different region, and they have like 115" this year, so it is kind of a waste of brain space to care what happens to them

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SHORT TERM /6 AM SUNDAY MORNING THROUGH TUESDAY NIGHT/...

COLD FRONT WILL CROSS THE MID-ATLANTIC DURING THE DAYTIME SUNDAY.

EXPECT QUITE A STRATIFICATION OF TEMPERATURES FROM NORTH TO SOUTH

ON SUNDAY WITH AROUND 40 NEAR THE MASON DIXON TO LINE TO PERHAPS

ABOVE 60 TOWARD THE CENTRAL VA FOOTHILLS.

 

FRONT WILL WIND UP IN SOUTHERN VIRGINIA BY DAYS END SUNDAY. ONE WAVE

OF LOW PRESSURE RIDING ALONG THE FRONT AND ASSOCIATED

OVERRUNNING/ISENTROPIC LIFT WILL ALLOW PRECIPITATION TO BREAK OUT BY

SUNDAY AFTERNOON. BOUNDARY LAYER TEMPERATURES SUPPORT MAINLY RAIN AT

THE ONSET OF PRECIPITATION ON SUNDAY...BUT COLDER AIR BOTH AT THE

SURFACE AND ALOFT WILL PRESS SOUTHWARD THROUGH THE CWA SUNDAY NIGHT.

 

AS COLDER AIR MOVES SOUTHWARD...RAIN WILL TRANSITION TO FREEZING

RAIN AND SLEET AND THEN SNOW FROM NORTH TO SOUTH. MODELS HAVE COME

IN BETTER AGREEMENT THAT WHILE A PERIOD OF FREEZING PRECIPITATION IS

LIKELY SUNDAY NIGHT...THE PREDOMINANT P-TYPE DURING THIS EVENT WILL

BE FROZEN /I.E. SNOW/ AND WITH AMPLE MOISTURE SIGNIFICANT SNOWFALL

ACCUMULATIONS /ON TOP OF ICE/ MAY RESULT.

 

WINTER STORM WATCH IS IN EFFECT EFFECT BEGINNING SUNDAY

EVENING/SUNDAY NIGHT AND WILL CONTINUE. /BPP

 

A COLD FRONT WILL BE ALIGNED FROM WEST TO EAST ACROSS NORTH

CAROLINA MONDAY. COLD AIR WILL BE BLASTING SOUTHWARD ACROSS THE

REGION WITH THE NOSE OF THE COLD AIR FOCUSING ITS PUSH EAST OF THE

SHENANDOAH VALLEY. MID LEVEL AND UPPER LEVEL ENERGY WILL BE

ARRIVING FROM THE SOUTHWEST MONDAY TO AID IN MODERATE TO HEAVY

PRECIPITATION ALONG AND NORTH OF THE FRONT.

 

THE GREATEST OVERRUNNING OF MOISTURE AT THE 850MB LEVEL OVER THE

SURFACE COLD AIR WILL BE ACROSS THE CENTRAL SHENANDOAH VALLEY AND

VIRGINIA PIEDMONT TO THE CENTRAL CHESAPEAKE BAY REGION. ITS IN THIS

LARGE REGION THAT THE GREATEST THREAT FOR A SMALL ICE ACCUMULATION

TO BE ACCOMPANIED BY A MODERATE TO POSSIBLY HEAVY SNOW AND SLEET

ACCUMULATION. THERE IS MORE OF A THREAT FOR MODERATE TO HEAVY

SNOW AND SLEET NORTHWEST OF THIS REGION TO NEAR I-81 AND MORE OF A

THREAT FOR ALL SNOW NORTHWEST ACROSS THE POTOMAC HIGHLANDS.

 

THE ICE THREAT IN EASTERN VIRGINIA INTO SOUTHERN MARYLAND MONDAY

MORNING SHOULD TRANSITION OVER TO MORE OF A SNOW AND SLEET THREAT

MONDAY AFTERNOON INTO MONDAY EVENING AS THE BRUNT OF THE COLD AIR AT

THE SURFACE AND AT 850MB OVERTAKES ANY SOUTHWESTERLY FLOW IN THE MID

LEVELS.

 

IN A NUTSHELL...FOR MONDAY AND MONDAY NIGHT...AND GIVEN POTENTIAL

SNOW RATIOS OF 15 TO 1...AN ADDITIONAL 3 INCHES OF SNOW AND SLEET IN

THE NORTHWEST...5 INCHES OF SNOW AND SLEET IN THE SOUTHEAST WITH A

FEW HUNDREDTHS OF ICE...AND AN ADDITIONAL 5 TO 7 INCHES OF SNOW AND

SLEET IN THE INTERIOR PORTION OF OUR REGION WITH A FEW HUNDREDTHS TO

ONE TENTH OF AN INCH OF ICE.

 

ALL OF THIS WINTRY MESS SHOULD END FROM NORTHWEST TO SOUTHEAST

MONDAY AFTERNOON IN THE POTOMAC HIGHLANDS AND ENDING ELSEWHERE

MONDAY NIGHT. HIGH PRESSURE WILL BUILD IN BEHIND THE DEPARTING

ENERGY AND SURFACE FRONT...ONLY TO REINFORCE THE ARCTIC AIR OVER A

SNOW PACK REGION.

 

TUESDAY AND TUESDAY NIGHT WILL BE DRY BUT VERY COLD. THERE COULD BE

A FEW UPSLOPE SNOW SHOWERS IN PARTS OF THE POTOMAC HIGHLAND WITH

ENERGY SLIDING BY TO THE NORTH...BUT LITTLE TO NO ACCUMULATION

EXPECTED.

 

TEMPERATURES WILL BE ANOTHER ISSUE WITH THIS MARCH STORM SYSTEM

MONDAY THROUGH TUESDAY NIGHT. EXPECT TEMPERATURES TO BE 20 TO 30

DEGREES BELOW NORMAL MONDAY THROUGH TUESDAY NIGHT.

 

HIGH TEMPERATURES MONDAY COULD OCCUR MIDNIGHT SUNDAY NIGHT WITH

TEMPERATURES NEAR FREEZING THEN GRADUALLY FALLING THROUGH THE DAY

MONDAY AND MONDAY NIGHT TO TEMPERATURES IN THE LOWER TEENS BY

MIDNIGHT MONDAY NIGHT.

 

LOW TEMPERATURES MONDAY NIGHT WILL RANGE FROM THE LOWER SINGLE

DIGITS IN THE NORTHWEST TO MIDDLE TEENS NEAR THE CHESAPEAKE

BAY.

 

HIGH TEMPERATURES TUESDAY...WHEN CONSIDERING BOTH COLD AIR ADVECTION

AND SNOW PACK...WILL REMAIN BELOW FREEZING NEARLY EVERYWHERE. TUESDAY

NIGHT TEMPERATURES WILL BE AROUND 10 IN MOST AREAS. /KLW

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NAM 18z soundings show the warm nose is almost gone at 9z (4am), and completely cold by 12z (7am). Also interesting are the soundings at hour 33 (3z / 10pm EST Sunday night) as the first impulse of moisture comes through. Warm nose, but cold surface already then. We could see a mix with the first impulse that was supposed to be all rain.

 

NAM 18z @ 33 hr: http://www.twisterdata.com/index.php?sounding.lat=39.1182&sounding.lon=-77.0689&sndclick=y&prog=forecast&model=NAM&grid=221&model_yyyy=2014&model_mm=03&model_dd=01&model_init_hh=18&fhour=33&parameter=TMPF&level=2&unit=M_ABOVE_GROUND&maximize=n&mode=singlemap&sounding=y&output=image&view=large&archive=false

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I'd think you can watch the progress of the cold air tomorrow and have a pretty good idea of how far south or north the heavier precip will be. Just a hunch.

I'm worried it will go south.  How much farther south can it get?  It may go south.  If it goes south, then we may only get 5 to 8 inches instead of 8 to 12.  Will it go south?

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Getting slightly worried about the south trend, how much further can it go and will it end up north in the nowcasting like usual?

 

I think it has been covered quite a bit....Nobody is going to be able to give people enough reassurance that it won't keep trending south....I think it worth mentioning that 1/21 shifted north at the last minute....GFS was the only model to stay south.....regardless of the setup, in my experience models shift north at the end...add the fact that models are not going to capture banding that will occur on the northern periphery of the best push....I'm slightly worried too, but there is nothing we can do about it...I still think we are in a good spot...we may not get the max, but 4"+ is still a nice snowfall...not everyone can always be jackpotted (except Philly)

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I'm worried it will go south. How much farther south can it get? It may go south. If it goes south, then we may only get 5 to 8 inches instead of 8 to 12. Will it go south?

Not cool. I'm not one of these wringing my hands over whether it goes south or not. I was just making an observation that the boundary seems to be the focus for the heavier precip.

Guess I was being a "taker" with my post. Jeez

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