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Late Weekend Storm Threat


IsentropicLift

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Forecast and Map.....from the K of K.U. fame himself

 

PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
329 PM EST SUN FEB 08 2015
 
VALID 00Z MON FEB 09 2015 - 00Z THU FEB 12 2015
 
DAYS 1 TO 2...

...NORTHERN MID-ATLANTIC/NEW ENGLAND...

WHILE THE FIRST AREA OF SNOW AFFECTED NEW YORK AND NEW ENGLAND THE
PAST NIGHT AND MORNING WITH UP TO A HALF FOOT OF SNOW...THE NEXT
BURST OF SIGNIFICANT SNOW IS NOW DEVELOPING FROM NEW YORK AGAIN
ACROSS CENTRAL AND SOUTHERN NEW ENGLAND. A LARGE VERY COLD CELL
OF HIGH PRESSURE NORTH OF NEW YORK AND NEW ENGLAND CONTINUES TO
FUNNEL VERY COLD AIR SOUTHWARD CREATING QUITE A FRONTAL ZONE OVER
THE MID ATLANTIC STATES SEPARATING TEMPERATURES IN THE TEENS
ACROSS MASSACHUSETTS TO 70 DEGREE TEMPERATURES OVER VIRGINIA.

ALONG THIS PRONOUNCED BAROCLINIC ZONE...WEAK AREAS OF LOW PRESSURE
WILL MOVE ALONG THE BOUNDARY WITH ONLY WEAK SHORTWAVE DISTURBANCES
BUT WITHIN THE CONFLUENT ENTRANCE REGION OF AN UPPER JET EXITING
NEW ENGLAND. SNOWFALL WILL LAST ANOTHER 24 TO 30 HOURS FOLLOWING
00Z WITH GENERALLY LIGHT TO MODERATE SNOWFALL.
HOWEVER...MESOSCALE BANDING IS ALREADY APPEARING ACROSS NEW YORK
AND WITH A DEVELOPING COASTAL FRONT ACROSS SOUTHEASTERN
MASSACHUSETTS...THERE ARE LIKELY TO BE LOCAL SNOWFALL
ENHANCEMENTS...POSSIBLY IN EASTERN MASSACHUSETTS AND ALONG THE
USUAL UPSLOPE AREAS NEAR THE WORCESTER HILLS/THE BERKSHIRES AND
THE CATSKILLS. THERE IS A MODERATE LIKELIHOOD OF GREATER THAN A
FOOT OF SNOW IN THESE LOCATIONS.

GIVEN THAT MUCH OF THE SNOWFALL OCCURS ON DAY 1...A MULTI MODEL
BLEND WAS USED TO DERIVE THE INITIAL SNOWFALL GUESS BUT THE
MAXIMUM SNOWFALL OF GREATER THAN 6 ADDITIONAL INCHES WAS CENTERED
FROM CENTRAL AND EASTERN NEW YORK ACROSS SOUTH CENTRAL NEW
ENGLAND.

WITH HIGH PRESSURE PARKED TO THE NORTH...COLDER AIR WILL SLOWLY
FUNNEL SOUTHWARD ALTHOUGH COOLING WILL BE SLOWER TO PROCEED ABOVE
THE SURFACE MEANING THAT FREEZING RAIN WILL LIKELY BE AN ISSUE
FROM EXTREME SOUTHERN NEW ENGLAND ACROSS NEW YORK CITY AND LONG
ISLAND...AND THEN COULD SLOWLY WORK ITS WAY SOUTHWARD ACROSS
EASTERN PENNSYLVANIA/NEW JERSEY AND EVENING NORTHEAST MARYLAND AND
DELAWARE. FOR MOST AREAS CURRENTLY QUITE MILD...THIS MAY BE ONLY
A MINOR CONCERN BUT ACROSS NORTHEAST PENNSYLVANIA/NORTHERN NEW
JERSEY/NYC/LI AND SOUTHERN CT...IT COULD GET QUITE DICEY AS
TEMPERATURES FALL WELL BELOW FREEZING. THERE IS EVEN A LOW
PROBABILITY THAT ICING EXCEEDING .25 INCHES WILL OCCUR PRIMARILY
ACROSS NORTHEAST PENNSYLVANIA


BY DAY 2/TUESDAY MORNING...SOME LIGHT ICING IS POSSIBLE ACROSS THE
MID ATLANTIC AS WELL AS SOME RESIDUAL LIGHT SNOW...ESPECIALLY
ACROSS EASTERN MASSACHUSETTS.
 
KOCIN
 

http://www.hpc.ncep.noaa.gov/lowtracks/lowtrack_ensembles.gif

 

http://www.hpc.ncep.noaa.gov/discussions/hpcdiscussions.php?disc=qpfhsd

 

http://www.hpc.ncep.noaa.gov/wwd/day1_psnow_gt_04.gif

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For my friends on LI. Expect light freezing rain and sleet changing to a little snow...c-2" Dangerous travel tomorrow. Thats about it.

 

I thought there was going to more the other day...I guess I was wrong...nothing ever goes as planned, it seems.  It is extremely sickening.

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I thought there was going to more the other day...I guess I was wrong...nothing ever goes as planned, it seems. It is extremely sickening.

Sometimes these storms have surprises as you know as well as anyone. Who knows what will actually happen. The ceiling is 4" here IMO. Wouldn't be shocked if we saw just flurries. Still going with my above forecast though. The icing threat is real. While it won't be anything close to catastrophic, it most likely will lead to dangerous travel and many accidents.

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At 5PM the 0 C isotherm @ 850 MB runs from about New London CT over to northern Westchester County...the 0 C line @ 925 MB runs from the N. Fork of LI over to Cos Cob CT...so the critical lines are very close to the area.

Just to let you all know, orient,ny 30 and dropping and it's sleeting and snowing moderately

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Sometimes these storms have surprises as you know as well as anyone. Who knows what will actually happen. The ceiling is 4" here IMO. Wouldn't be shocked if we saw just flurries. Still going with my above forecast though. The icing threat is real. While it won't be anything close to catastrophic, it most likely will lead to dangerous travel and many accidents.

 

I thought that big thermal contrast would have generated a lot more precipitation along the boundary...it seemed sound in theory.

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Just to let you all know, orient,ny 30 and dropping and it's sleeting and snowing moderately

 

I did write several times that that was the best spot in the CWA to make something out of this mess...being the NE most point in the CWA...might do ok with some luck out there...a good 40 miles to my ENE.

 

 

Well, probably not including Putnam & Orange & Rockland & N. Westchester Counties & the southern tier of CT...but I meant out of NYC, N. Jersey, and LI. 

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I did write several times that that was the best spot in the CWA to make something out of this mess...being the NE most point in the CWA...might do ok with some luck out there...a good 40 miles to my ENE.

 

 

Well, probably not including Putnam & Orange Counties...

it's going to end there within the next 20-30 minutes looking at radar....not much behind this initial batch...got a light dusting here from it

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it's going to end there within the next 20-30 minutes looking at radar....not much behind this initial batch...got a light dusting here from it

 

Has your town had a snowy winter?  That's not far from Bridgeport, right?

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You know, I think everyone should stop trying to predict what they think will happen and actually report what is happening (nowcasting/observations). I could be way off here but I am not completely buying the lack of QPF being shown by some of the models. 

 

It is a thread sort of dedicated to what we think will come to pass...so I think I'm in the right spot.

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we are at about 30 inches give or take, 25 of which has fallen since 1/24.   I'm about 7 miles NW of BDR reporting station

 

I had about 33 here...which is really very good for early February.  I think some of these near misses make it seem like a less than satisfactory winter. 

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