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Thanksgiving Week Storm (Wed/Wed night)


ORH_wxman

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GYX is honking big..........

000FXUS61 KGYX 260906AFDGYXAREA FORECAST DISCUSSIONNATIONAL WEATHER SERVICE GRAY ME406 AM EST WED NOV 26 2014.SYNOPSIS...LOW PRESSURE WILL DEVELOP OFF THE MID ATLANTIC COAST TODAY ANDTRACK NORTHEAST TO JUST SOUTH OF CAPE COD BY WEDNESDAYEVENING....BRINGING A SIGNIFICANT SNOWFALL TO NORTHERN NEWENGLAND. THE COASTAL LOW WILL CONTINUE NORTHEAST INTO THEMARITIMES WEDNESDAY NIGHT. COLD HIGH PRESSURE WILL BUILD IN FROMTHE WEST ON FRIDAY AND SATURDAY. THE FLOW SHIFTS TO THE SOUTHWESTSUNDAY WITH A WARM UP EXPECTED. ANOTHER COLD FRONT CROSSES THEREGION ON MONDAY.&&.NEAR TERM /THROUGH TONIGHT/...AS WE CLOSE IN ON THE STORM MORE AND MORE MESOSCALE DETAILS HAVEEMERGED, AND HAVE ENHANCED OUR EXISTING FORECAST WITH THESEDETAILS... HOWEVER THE BROAD PICTURE HAS NOT CHANGED. ** A MAJOR WINTER STORM WILL IMPACT NH AND ME THROUGH WEDNESDAY  AFTERNOON SIGNIFICANTLY HAMPERING TRAVEL**AT 09Z THE LOW WAS CENTERED JUST OFF THE CAROLINA COAST AND WILLTRACK RAPIDLY NORTHEASTWARD THROUGH THE DAY TODAY. TRACK FORECASTSHAVE COME INTO GOOD AGREEMENT FOR THE LOW TO PASS JUST NORTHWESTOF THE 70W/40N BENCHMARK AROUND 03Z THURSDAY.THERE ARE TWO MAIN AREAS OF CHANGE FOR THIS FORECAST PACKAGE. THEFIRST IS THE NORTHERN EXTENT OF THE HEAVY SNOW. QPF AMOUNTS HAVEINCREASED IN PRETTY MUCH ALL FORMS OF GUIDANCE... COMBINED WITHCOLD TEMPS AND IDEAL SNOW GROWTH THIS HAS RESULTED IN AN INCREASEOF SNOWFALL FOR THE NORTHERN MOST ZONES... AND HAVE UPGRADED TO AWINTER STORM WARNING FOR THE WHOLE CWA. SOME POCKETS OF THE UPPERCT VALLEY MAY REMAIN MARGINAL IN TERMS OF SNOW TOTALS... BUT FEELTHE MAJORITY OF THE ZONE WILL MEET CRITERIA.THE OTHER CHANGE... AND OF GREATER CONCERN IS THE POTENTIAL FORBANDING... RESULTING IN VERY HEAVY SNOWFALL RATES. VERY STRONGBANDING SIGNATURE WITH 700MB FRONTOGENESIS CONCENTRATED IN A LINEEXTENDING FROM KEENE NH PARALLEL TO THE GULF OF MAINE UP THROUGHTO CALAIS ME. THIS PAIRS UP NICELY WITH A LAYER OF INSTABILITYEXTENDING FROM 700 TO 500MB... SETTING US UP FOR A CLASSICNORTHWEST SECTOR BAND AS THE LOW PASSES FROM SOUTH OF LONG ISLANDNORTHEASTWARDS TOWARDS THE BENCHMARK FROM 00Z-06Z TOMORROW. ATTHIS POINT THIS SAME SIGNATURE IS EVIDENT IN ALL THE MAJORGUIDANCE GFS/NAM/ECMWF/CMC ... GIVING FAIRLY HIGH CONFIDENCE OFTHE FORMATION OF THE BAND. THE NATURE OF THE BEAST IS THAT THEEXACT LOCATION MAY SHIFT SLIGHTLY NORTH OR SOUTH.. GIVING VERYDIFFERENT SNOWFALL TOTALS WITHIN A FEW MILES BUT FEEL THERE WILLBE PORTIONS OF THE COASTAL PLANE IMPACTED BY THIS FEATURE BETWEEN00Z AND 06Z. SNOW TOTALS HAVE INCREASED SLIGHTLY THROUGH THIS AREATO REFLECT THIS BANDING POTENTIAL.**THIS BANDING WILL RESULT IN SNOWFALL RATES OF 1-3"/HR THROUGH THE MOST INTENSE PARTS OF THE BAND.** IN NEW HAMPSHIRE... THE CORRIDOR FROM CONCORD TO MANCHESTER WILL SEE HEAVY SNOW STARTING AROUND 21Z AS THE BAND PUSHES NORTHWARDS. BETWEEN 00Z AND 03Z IT SETS UP NICELY PARALLEL TO THE COAST THROUGH THE ENTIRE COASTAL PLANE... IMPACTING ALL NORTH SOUTH TRAVEL ROUTES IN THE CWA. OVERALL THE QUICK MOVING NATURE OF THE SYSTEM WILL HELP AS MOST AREAS WILL SEE THE MOST INTENSE SNOWFALL RATES LIMITED TO AROUND 3HRS. AN EXCEPTION TO THIS IS THE LEWISTON TO AUGUSTA REGION... WHERE THE BAND MAY PIVOT AS THE LOW TURNS MORE NORTHWARD KEEPING THE I-95 CORRIDOR OF SOUTHWEST MAINE UNDER THE HEAVY SNOW A BIT LONGER.ONCE AGAIN...THE CONDITIONS WILL BE QUICKLY DETERIORATING ANDEXPECTED TO BE THE WORST WED AFTERNOON AND EVENING...COINCIDINGWITH THE BUSIEST TRAVEL TIMES. TRAVELERS SHOULD BE AT THEIRDESTINATIONS BY WED AFTERNOON IF AT ALL POSSIBLE.&&
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It's always been a big thump of snow to a few hours of sleet..back to snow.. Nothing changed..What some folks underestimated was the BL warmth. That is what is going to hurt lower elevations

No I disagree that it was underestimated. It has always been a factor that heavy snow would overcome.

My concern for areas at 500' like myself and Steve is that it isn't going to be a big thump followed by a few hours of sleep...it is going to be an hour or two of accumulating snow followed by a big thump of sleet.

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Kev, you will accumulate better and also have longer to hold on to snow. I can see you getting 7-8 while areas around you get less.

I'm going to see quite a bit of sleet..but the key is timing the changeover. if it happens even an hour or 2 earlier than I think..then instead of 8 I get 6..though adding on an inch or 2 of sleet is good too

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KORH. 7"

KBDL 2"

KPVD 0"

KTAN 1"

KBOS 0"

KGAY 3"

KHUB 8"

KTOL 6"

KDEND 10"

KGINX 3"

KMPM 9"

KHIPPY 9"

KDRYSLUT 11"

 

methinks you're selling yourself several inches short there, Dave.  Add some more mashed potatoes to that Thanksgiving plate.

 

Bos 1.5 all back end

Orh 9

Con 14

Bdl 5

Bdr 0

Pvd 0

Tan 0

Tol 7 after slantstick

Me 3.5

Mpm 14

JP is Norfolk CT with 19

 

Ouch.

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