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Post-Super Bowl Storm chance discussion


rossi

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My only worry...we're in the same position as the collapses of last March and at the same time too. Hopefully we don't see a collapse at 12z.

 

Exact same position at that, paranoia led me to dig back into that event a few hours ago and CMC was the only model at 00z Thursday night showing a DC hit. LOL By 12z essentially what would be tomorrow every other model followed suit. But lets not get hung up on that.  :bag:

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My only worry...we're in the same position as the collapses of last March and at the same time too. Hopefully we don't see a collapse at 12z.

Just posted the same concern on FB - those March storms that looked so good until the last 12 hours or so - and then major suppression, due to the arctic cold - if I recall correctly from several inches to nada in at least two cases...

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I'm more worried that the 500mb shortwave is fairly strong to our NW, this could allow the 850mb low to get pretty far NW. A worst case scenario which is def in the cards is the 0z UKMET. I think it would be good for NYC & Philly if we see a slight trend S on the 6z 12z models tomorrow. 

 

There is no chance of rain though right? I would think a northward trend would be good for more snow up here, no?

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...MID-LEVEL HEIGHT FALLS REACHING THE NORTHERN PLAINS BY
01/1200Z...
...SURFACE LOW CROSSING THE MID-ATLANTIC LATE IN THE PERIOD...

FINAL PREFERENCE: BLEND OF THE 00Z GFS/ECMWF
FORECAST CONFIDENCE: BELOW AVERAGE

A BAND OF HEIGHT FALLS DIPPING DOWN INTO THE NORTHERN/CENTRAL
PLAINS ON SUNDAY MORNING WILL PLAY A KEY ROLE IN THE FORECAST
GIVEN THE THREAT FOR WINTRY PRECIPITATION FROM THE CENTER OF THE
CONUS EASTWARD TO THE MID-ATLANTIC. AS WAS THE CASE
YESTERDAY...THE QUICKER AND MORE AMPLIFIED 00Z/12Z UKMET SUPPORT
SURFACE LOW DEVELOPMENT THAT IS MORE DEFINED AND NORTH OF THE
MODEL ENVELOPE. THIS RESULTS IN A NORTHWARD DISPLACED
PRECIPITATION AXIS ON DAY 2. AS TIME MOVES FORWARD...TIMING
DIFFERENCES PREVAIL WITH THE 00Z UKMET CONTINUING TO BE QUICKER
RESULTING IN THE SURFACE WAVE BEING OFFSHORE OF SOUTHERN NEW
ENGLAND BY 02/1200Z. MEANWHILE...THE 00Z NAM/CMC BEING SLOWER
RESULT IN TIMING ISSUES. THE MODELS DO CONTINUE TO WAFFLE AS
EVIDENT BY THE 00Z GFS WHICH SHIFTED ITS LOW TRACK BY A COUPLE
HUNDRED MILES ON MONDAY MORNING. HOWEVER...THE 00Z ECMWF DID
FOLLOW THIS MOVE NORTHWARD WHICH COULD BE THE LATEST TREND TO AT
LEAST CONSIDER. A SNEAKING SUSPICION SAYS THE 12Z GUIDANCE WILL
COME BACK SOUTH BUT FEEL THE FORECAST AT LEAST SHOULD CONSIDER
WHAT THE 00Z GFS/ECMWF DEPICT. WILL PRESENT A BLEND OF THE 00Z
GFS/ECMWF BUT MAINTAINING THE AFOREMENTIONED BELOW AVERAGE
CONFIDENCE.

 

 

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

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Exact same position at that, paranoia led me to dig back into that event a few hours ago and CMC was the only model at 00z Thursday night showing a DC hit. LOL By 12z essentially what would be tomorrow every other model followed suit. But lets not get hung up on that.  :bag:

Ggem has had a hot hand lately, can't toss it just the same as you can't toss the Ukie. There's about a 500 mile spread between the two. For now GFS and Euro
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Guys please look at the mid level before you yell ratios on every run .

A weaker solution and further placement of the SLP and your 850 s will be colder and your ratios are better. But it comes with a price of lighter QPF

A further N placement and a wetter solution has more precip but is warmer aloft and 10 to 1 apply.

You can have one but you can not have both. Stop yelling ratios for every scenario it implies that you are not looking

At this closely.

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All the 4-8 and 6-10 inch events sort of blend into one, 12/5/02, 2/7/03, 2/3/96, 2/16/96, 3/2/96, 1/12/11, too hard to distinguish.

 

12/5/2002 stands out because it was the *start* of the amazing '03, '04, '05 run (all three winters had 60"+ @ Upton).

 

1/12/2011 was a huge storm out here...much better than Boxing Day in these parts...about 18" fell.

 

The other 4 are really nondescript...only 3 stand out from 1995-96...the 11 inch one before Christmas...the January blizzard...and the 12" storm on April 10th. 

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http://www.tropicaltidbits.com/analysis/models/gfs/2015013006/gfs_mslp_pcpn_frzn_us_13.png

 

metro snowstorm on track

thats 998mb before it hits the water

 

images don't load ?

Is it time to clear your cache? 

 

low track is up

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

 

disco

DAYS 2 AND 3...

...CENTRAL PLAINS/MID MISSISSIPPI VALLEY/OHIO VALLEY/LOWER GREAT
LAKES/NORTHERN MID ATLANTIC/NORTHEAST...

WHILE THE SOUTHWEST TROUGH HEADS SOUTHWARD INTO MEXICO...ENERGY
AND MOISTURE EJECTING EASTWARD ACROSS THE PLAINS AND MISSISSIPPI
VALLEY WILL COMBINE WITH A SHARPLY AMPLIFYING TROUGH MOVING
SOUTHEASTWARD ACROSS THE NORTHERN ROCKIES ON SATURDAY NIGHT AND
BECOME A SIGNIFICANT TROUGH OVER THE MISSISSIPPI VALLEY BY SUNDAY.
THE CONSOLIDATION OF THESE SYSTEMS APPEAR TO PRODUCE AN EXPANDING
AREA OF SIGNIFICANT SNOW WITH MODERATE TO HIGH PROBABILITIES OF
GREATER THAN 4 INCHES OF SNOW FROM EASTERN NEB TO CENTRAL IL ON
DAY 2... SATURDAY MORNING INTO SUNDAY MORNING...WITH A LOW
PROBABILITY OF GREATER THAN 8 INCHES CENTERED ACROSS SOUTHERN
IA/NORTHERN MO INTO CENTRAL IL. AS THIS STORM DEVELOPS...MUCH
COLDER AIR WILL BUILD NOT ONLY BEHIND THE SYSTEM AS A LARGE ARCTIC
ANTICYCLONE HEADS SOUTHWARD INTO THE NORTHERN PLAINS...BUT COLDER
AIR WILL ALSO BLEED EASTWARD AS PRESSURES RISE OVER SOUTHEASTERN
CANADA AND NORTHERN NEW ENGLAND IN ASSOCIATION WITH A PRONOUNCED
UPPER CONFLUENCE ZONE. THE COMBINATION OF THESE TWO SYSTEMS WILL
HELP GENERATE A INCREASINGLY BAROCLINIC ZONE UPON WHICH THE
DEVELOPING SURFACE WILL MOVE ALONG. ON DAY 3...SUN MORNING INTO
MON MORNING...A MODERATE TO HIGH RISK FOR 4-INCHES OR MORE OF SNOW
IS FORECAST TO EXTEND FROM CENTRAL IL TO EASTERN PA...WITH A
SLIGHT RISK FOR 8-INCHES EXTENDING FROM IND TO WESTERN MD/PA AND
EASTERN WV.

THE PREVAILING SHIFT IN THE 00Z MODELS WAS FOR A MORE NORTHERLY
TRACK WITH THIS SYSTEM...WHICH IS REFLECTED IN THE WPC
FORECAST...PARTICULARLY FROM LATE DAY 2 ONWARD. HOWEVER FORECAST
CONFIDENCE WAS TEMPERED BY THE RUN-TO-RUN INCONSISTENCIES THE
MODELS HAVE SHOWN ALONG THE WITH DISTINCT POSSIBILITY THAT THE
MODELS MAY REVERSE TRENDS IN SUBSEQUENT RUNS.

THE PROBABILITY OF SIGNIFICANT ICING IS LESS THAN 10 PERCENT.

PEREIRA

 

gfs north trend holds ATM

 

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

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So no one is worried this might end up as a bunch of slop for NYC? The storm has jumped north 200 miles since yesterday. DC and possibly Philly is out of the game at this point and we may not be done trending. Of course, the north trend may be overdone too so today's runs will be crucial

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