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Obs/Weenie disco thread for SWFE to coastal Feb 2


Damage In Tolland

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I'm somewhat impressed with the way round 2 looks right now down to the southwest in the Delmarva and Mid-Atlantic...given that the sleet line is already collapsing back SE...there could be some nice bonus snows for many...esp in eastern areas where the backlash should be heaviest. I wonder if BOS can end with over 12". Seems like a very good possibility.

 

RAP now suggesting 850 pops a new height contour around 18z right over SNE. We're probably seeing the result of that deepening going on right now across northern MA.

 

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1030 BOX Update.

 

 

 

.NEAR TERM /UNTIL 6 PM THIS EVENING/...

1030 AM UPDATE...

*/ HIGHLIGHTS...

- MAJOR WINTER STORM CONTINUES WITH HEAVY SNOW FOR MOST LOCATIONS
- MIX OF SLEET / FREEZING RAIN ALONG THE SOUTH-COAST
- CHANGEOVER TO RAIN ACROSS THE OUTER-CAPE AND ISLANDS
- AS THE STORM SWEEPS OUT...CHANGEOVER BACK TO SNOW
- CONTINUED IMPACTS TO TRAVEL INTO THIS AFTERNOON / EVENING

*/ OVERVIEW...

CHALLENGING FORECAST TO SAY THE LEAST...ESPECIALLY WITH REGARDS TO
2M TEMPERATURES. CONDITIONS TURNING COLDER ACROSS THE HUDSON / CT-
RIVER VALLEY AS THE LOW EMERGES OFF THE COAST OF NJ AND THE WINDS
ENHANCE IN CONCERT WITH THE ISALLOBARIC RESPONSE. MEANWHILE TO THE
E CONDITIONS ARE WARMING AND THE COASTAL FRONT ACROSS IMMEDIATE E
MA TOWARDS SE RI IS TIGHTENING. ENHANCEMENT OF THE LOW PER THE
EMERGENCE OF THE MID-LEVEL IMPULSE IS AMPLIFYING THE S-FLOW ALONG
AND AHEAD. CAN CLEARLY SEE THE WARM LAYER AROUND 3-4 KFT SLOWING
TO THE N PER CORRELATION-COEFFICIENT VIA DUAL-POL. MODEL GUIDANCE
IS IN GOOD CONSENSUS...BUT WHEN HANDLING THE SMALL FINE-SCALE
DETAILS...IT IS NOT DOING SO WELL. HAS BEEN CHALLENGING TO UPDATE
THE FORECAST...WHICH HAS BEEN FOR THE MOST PART BEEN PRETTY GOOD.
JUST THE SMALL NUANCES OF THE MIXING LINES / COASTAL FRONTS AS TO
THEIR PROXIMITY. ITS NOT EASY. DOING THE BEST WE CAN. SO WILL HIT
THE DETAILS WITHIN THE HIGHLIGHTS BELOW:

*/ PTYPE AND SNOWFALL...

IMMEDIATE S-COAST INTO THE SE COASTAL PLAIN OF MA HAS OR WILL SEE
A CHANGEOVER TO A MIX OF SNOW / SLEET / FREEZING RAIN INTO THE
MIDDAY HOURS. RAIN ANTICIPATED FOR THE CAPE / ISLANDS. TWO LINES
OF DIFFERENTIATION ALREADY SETTING UP: THE WARM LAYER ALOFT AT 3-4
KFT AS PREVIOUSLY MENTIONED...AND THE COASTAL FRONT. IT IS TO THE
N AND W OF THESE LINES IT WILL REMAIN AS ALL SNOW. IT IS LIKELY
THE LINES WILL WOBBLE AND THERE MAY BE CHANGES AS FAR N AS THE MA-
PIKE AND NW-CORRIDOR OF THE 495-BELTWAY. AFTER THE MIDDAY HOURS...
WILL SEE A CHANGE-BACK TO SNOW AS THE STORM EXITS E AND NW-WINDS
FOLLOW USHERING COLDER AIR THROUGH ALL-LEVELS BACK INTO THE REGION
DURING WHICH TIME AN ADDITIONAL INCH OR TWO ACCUM IS POSSIBLE.

NONE OF THE GUIDANCE HAS BEEN HELPFUL IN CONSENSUSLY FORECASTING
OUTCOMES. HAVE GONE WITH THE PRIOR 2M TEMPERATURE FORECAST WHILE
USING WET-BULB WEIGHTING. THIS HAS THE MIXING LINE AS FAR N AS
HARTFORD-WORCESTER-BOSTON.

OTHERWISE CONTINUED OVERRUNNING SETUP RESULTING IN HEAVY AMOUNTS
OF PRECIP INTO THE AFTERNOON HOURS. NOTED BY THE PRIOR FORECASTER
STRONG H85 FRONTOGENESIS ALONG A TIGHT THERMAL GRADIENT WITH
PARENT -EPV SIGNAL AND WITHIN AN ENVIRONMENT OF FAIRLY STEEP MID-
LEVEL LAPSE RATES. SNOWFALL RATES OF 1-3"/HOUR WITH NEAR- BLIZZARD
CONDITIONS /ESPECIALLY ACROSS THE E-NE SHORELINE OF MA/ ARE
ANTICIPATED. CAN NOT RULE OUT THE POTENTIAL OF THUNDERSNOW.

SNOW AMOUNTS AROUND AND N OF HARTFORD-BOSTON-PROVIDENCE EXPECTED
TO BE AROUND 10 TO 14 INCHES. LESSER AMOUNTS S WITH MIXING OF
SLEET / FREEZING RAIN WHICH WILL AMOUNT UP AROUND 0.1 TO 0.2
INCHES. AREA OF BEST ICE ACCRETION / ACCUMULATION EXPECTED FROM S
RI INTO SE MA. AMOUNTS AROUND 4 TO 8 INCHES...LOWEST OVER THE
ISLANDS AROUND 2 TO 4 INCHES.

*/ STRONG WINDS AND BLOWING AND DRIFTING SNOW...

GUSTY WINDS BEING OBSERVED ALL ALONG THE E/NE MA COASTLINE. NEAR-
TO FULL-BLIZZARD CONDITIONS BEING OBSERVED WITH GUSTS OF 30 TO 40
MPH. POOR VISIBILITY IS OCCURRING AND WILL CONTINUE TO DO SO
THROUGH THE AFTERNOON. HAVE ADDRESSED THESE HAZARDS THROUGH A
SPECIAL WEATHER STATEMENT...BUT WILL NOT BE GOING WITH A FULL-ON
BLIZZARD WARNING AS CONDITIONS ARE ANTICIPATED TO BE SPORADIC AND
BRIEF.

*/ TOWARDS TONIGHT...

A SIGNIFICANT FLASH FREEZE IS LIKELY ACROSS PORTIONS OF SE MA AND
CAPE/ISLANDS LATE AFTERNOON AND EVENING AS AS THE COASTAL FRONT
MOVES THROUGH AND TEMPS PLUMMET FROM THE 30S DOWN TO TEENS IN THE
MATTER OF JUST 2-3 HOURS. THIS COULD HAVE A SIGNIFICANT IMPACT ON
TRAVEL LATE THIS AFTERNOON AND EVENING WITH WET/SLUSHY ROADS
QUICKLY TURNING TO ICE.
 
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7" sticking a tape measure into the snow on the deck just now. Most of the snow this morning is that very fine stuff, but we've had a few spells of the really big fluffy flakes recently. Those are my favorite, I love the depth of field that gives while watching the snow fall. I'm "working from home" today, which translates into staring out the windows entirely too much!

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I'm somewhat impressed with the way round 2 looks right now down to the southwest in the Delmarva and Mid-Atlantic...given that the sleet line is already collapsing back SE...there could be some nice bonus snows for many...esp in eastern areas where the backlash should be heaviest. I wonder if BOS can end with over 12". Seems like a very good possibility.

yes that's got my interest as peeps nw of me flipped back
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Nice

GUSTY WINDS BEING OBSERVED ALL ALONG THE E/NE MA COASTLINE. NEAR-

TO FULL-BLIZZARD CONDITIONS BEING OBSERVED WITH GUSTS OF 30 TO 40

MPH. POOR VISIBILITY IS OCCURRING AND WILL CONTINUE TO DO SO

THROUGH THE AFTERNOON. HAVE ADDRESSED THESE HAZARDS THROUGH A

SPECIAL WEATHER STATEMENT...BUT WILL NOT BE GOING WITH A FULL-ON

BLIZZARD WARNING AS CONDITIONS ARE ANTICIPATED TO BE SPORADIC AND

BRIEF.

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I wish it were true, but I think snow accumulation is pretty much done here after 2-3 inches. Oh well.

ya we got screwed pretty bad here on the south shore of RI. Oh well. You win some, you lose some (even though you lose more on the S Coast). Still shouldn't complain though as this puts me close to 30" on the season (26" in the last 7 days). Sure looks and feels wintry out there! Maybe we'll pick up an inch or two later this evening once we flip back to SN.
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I wish it were true, but I think snow accumulation is pretty much done here after 2-3 inches. Oh well.

ya we got screwed pretty bad here on the south shore of RI. Oh well. You win some, you lose some (even though you lose more on the S Coast). Still shouldn't complain though as this puts me close to 30" on the season (26" in the last 7 days). Sure looks and feels wintry out there! Maybe we'll pick up an inch or two later this evening once we flip back to SN.
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I'm somewhat impressed with the way round 2 looks right now down to the southwest in the Delmarva and Mid-Atlantic...given that the sleet line is already collapsing back SE...there could be some nice bonus snows for many...esp in eastern areas where the backlash should be heaviest. I wonder if BOS can end with over 12". Seems like a very good possibility.

Very cool squall line over Delaware-NJ, moving at nearly a right angle to the other echoes.

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Looks like about 6" total here so far, but haven't officially measured yet. It's dumping dendrites now, but much of the night it was this meh 3/4 mile visibility fine sand-like snow. I think there may have been some localized shadowing going on. Hopefully we make up some ground in this band now.

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