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The AnaFront/Coastal Storm Disco 02/05/16


Damage In Tolland

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Wrong thread for it but I always thought western SNE was west of the River. Western, then central areas are like ORH/TOL to the river, and eastern New England is 395 in CT east.

Atleast for wx purposes it seems to be the perfect line the last few years... Oh how I pray for those "NW of I84" storms again lol

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BOX's disco basically said they were hesitant to go higher because of the ARW so they took the GFS as a compromise. BOX is a great office and they do a good job usually, but that's a head scratcher for sure.

I'm gojng up to c-2, 2-4, 3-6 from west to east across CT but might go higher this evening. Want to see one more round of models before I go for warning level totals.

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BOX AM AFD

 

 

 

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/...
TONIGHT INTO TOMORROW...

*** WINTER STORM WATCH ISSUED FOR FAR SE MASS...SOUTH AND EASTERN
RHODE ISLAND...CAPE COD AND MARTHAS VINEYARD ***

OVERVIEW...

COLD FRONT STALLED OFF THE COAST WILL BE THE FOCUS FOR PRECIPITATION
TONIGHT AND INTO TOMORROW. VERY SHARP MID LEVEL TROUGH WILL APPROACH
FROM THE WEST TONIGHT...AND WITH POTENT SHORTWAVE ROUNDING THE
TROUGH A SURFACE LOW WILL DEVELOP OFF THE MID-ATLANTIC COAST. THIS
LOW WILL MOVE ALONG THE STALL COLD FRONT PUSHING THE PRECIP SHIELD
BACK TOWARDS THE REGION TONIGHT AND INTO TOMORROW.

UNCERTAINTY...

STILL UNCERTAINTY WITH THIS SYSTEM AS MODELS CONTINUE TO PUSH THE
PRECIP SHIELD FARTHER WEST WITH EACH RUN. HOWEVER SOME HI-RES
GUIDANCE DOES SHOW A EXTREME CUT-OFF IN QPF KEEPING THE WESTERN HALF
OF THE REGION PRECIP FREE. ASIDE FROM QPF...THERE IS SOME QUESTION
ON WHEN RAIN WILL SWITCH OVER TO SNOW LATE THURSDAY NIGHT INTO EARLY
FRIDAY MORNING. HOWEVER GUIDANCE DOES HINT THAT IT WILL BE BETWEEN
06-09Z. THIS IS IN LINE WHEN 925 MB TEMPS QUICKLY COOL BELOW 0C AS
WINDS BECOME MORE IN A NORTHERLY DIRECTION. FINALLY SNOWFALL AMOUNTS
ARE IN QUESTION AS THE LATEST EC AND 18Z NAM ARE ON THE HIGH SIDE
SHOWING LOCATIONS ACROSS RI AND SE MASS REACHING BETWEEN 7-10
INCHES. AT THIS TIME...HAVE A HIGHER CONFIDENCE FOR SIGNIFICANT SNOW
ACCUMULATION FOR THE COASTAL PLAIN AND LOCATIONS NEAR THE CANAL.
LESS CONFIDENCE ON THE NORTHWEST PORTION OF THE SNOW SHIELD AS
WELL AS LONG THE OUTER CAPE AND NANTUCKET.

QPF...

THERE APPEARS TO BE 2 DIFFERENT CAMPS IN TERMS OF QPF. THE
UKMET/EC/NAM IS ONE BRINGING SIGNIFICANT QPF AND THUS SNOW INTO
SOUTHEAST COASTAL PLAIN AND ACROSS SOUTHERN RHODE ISLAND. WHILE THE
NMM AND ARW ARE ON THE OPPOSITE...KEEPING THE HEAVIEST QPF OVER THE
CAPE AND IMMEDIATE PORTION OF SE MASS WITH AN EXTREME CUTOFF NORTH
OF THE I-95 CORRIDOR. THE GFS APPEARS TO BE IN THE MIDDLE OF THE
ROAD ALONG WITH THE EPS. USED A BLEND OF THE GUIDANCE WITH AN
EMPHASIS ON WPC QPF TO GET A TREND...WHICH SHOWS THAT THE 00Z
GUIDANCE HAS SHIFTED WESTWARD.

SNOWFALL...

DECIDED TO EXPAND THE THE WATCH DUE TO THE WESTWARD SHIFT WITH THE
GUIDANCE. HIGHEST CONFIDENCE OF 6 INCHES IS NEAR THE CAPE COD CANAL
AS WELL AS INTERIOR BRISTOL...PLYMOUTH AND WASHINGTON COUNTY RHODE
ISLAND. SNOW COULD BE HEAVY AT TIMES VERY LATE TONIGHT INTO FRI
MORNING WHICH MAY AFFECT THE MORNING COMMUTE. THANKS TO STRONG OMEGA
LIFT WITHIN THE SNOW GROWTH REGION AS WELL AS F-GEN AS NOTED AT THE
600MB LEVEL. BUFKIT SOUNDINGS ALSO SHOW SNOW ACCUMULATIONS YIELDING
CLOSE TO 1 INCH PER HOUR...REDUCING VSBYS FOR THE MORNING COMMUTE.
LOCATIONS ACROSS NANTUCKET AND THE OUTER CAPE WILL SEE LESS SNOWFALL
DUE TO LATER TIMING OF CHANGEOVER AND MARGINAL BOUNDARY LAYER WHICH
WILL LEAD TO SOME MELTING.

AGAIN WITH THE SHARP QPF GRADIENT ON THE NW FRINGE OF THE PRECIP
SHIELD THERE IS THE POTENTIAL FOR A BUST. AS THE PREV FORECASTER
MENTIONED...IF THE SYSTEM TRACKS EASTWARD THEN ACCUMULATIONS WILL BE
LESS. WHILE IF THE SYSTEM TRACKS FARTHER WEST...THEN HEAVY SNOW
COULD EXTEND BACK WESTWARD...WHICH IS WHAT THE LATEST TRENDS HAVE
SHOWN. RECOMMEND USERS TO LOOK AT THE PROBABILISTIC SNOWFALL MAPS
AND BEST/WORST CASE SCENARIOS WHICH COMMUNICATE THE EXPECTED
SNOWFALL RANGES.

IMPACTS...

THIS WILL BE A WET SNOW AND IF HEAVY SNOW MATERIALIZES THERE WILL BE
POTENTIAL FOR POWER OUTAGES DUE TO ACCUMULATION ON TREES AND POWER
LINES.

SNOWFALL WILL BEGIN TO WANE BY THE AFTERNOON HOURS AS THE LOW
PRESSURE SYSTEM MOVES TOWARDS THE MARITIMES.

&&
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Problem with using the GFS as the middle road is that it already caved

You have to remember that they aren't using 06z guidance when making their forecast for overnight package. So the 00z at the time looked more like a compromise.

I'm sure they will expand everything this afternoon assuming the 12z guidance stays with the robust solutions.

I probably would have put a little more weight on the euro than they did though and not bothered with the NMM junk

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You have to remember that they aren't using 06z guidance when making their forecast for overnight package. So the 00z at the time looked more like a compromise.

I'm sure they will expand everything this afternoon assuming the 12z guidance stays with the robust solutions.

I probably would have put a little more weight on the euro than they did though and not bothered with the NMM junk

I thought it was 6am? I admit I don't know the particulars of how the afds are administered.
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I thought it was 6am? I admit I don't know the particulars of how the afds are administered.

They'll usually start putting together the discussion well before that. They could have had that portion already written by 430 or so. Who knows. Though 6am is definitely a bit later than they normally put it out.

Either way I do think there were some head scratchers in there like focusing on SREF members like the NMM.

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