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Storm Chance 12/30/12


RowanBrandon

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How about we start here. Low temps gona bust by 5 degrees in a lot of areas Then u wake up to cloudy skies where's temps goin . And when precip moves in at minus 4 at 850. Where r ur temps going.? Then u go to 40 ? . Forecasted low in NYC 32. At 11 pm it's 30. Proforces to 28. 27 in colts neck. 30 laurel hollow. Not goin lower ? Same scenario as above. Will wait for euro. I don't c it

The old ETA looks alot like the Euro so thats good news if you want snow.

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This is the right idea, actually looking at real conditions instead of hugging models. Low dewpoints, radiational cooling, and a low tracking to the southeast argue for a mostly snow event.

True but ignores the primary tracking w of the apps that can pull in low-level warm air along the coastal plain if it is strong enough.

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mount holly

AS FAR AS MODEL VERIFICATION GOES WITH THE PRECIPITATION AS OF

00Z, THE ECMWF LOOKS TO HAVE DONE THE BEST JOB WITH BOTH THE AREA

EXTENT AND AXIS OF HEAVIEST RAIN. POOREST JOB BY THE WRF-NMMB. THE

SURFACE LOW LOOKS SLIGHTLY SLOWER THAN THE MODEL PROJECTION AND

THE GFS`S DOUBLE BARREL LOW LOOK LOOKS THE BEST.

SOUNDINGS ARE VERY DRY AND MOSTLY BELOW FREEZING. PHL FREEZING

LEVEL AT AROUND 1K OFF OF ACARS AND BWI AROUND 1200 FT, EWR NEARLY

COMPLETELY BELOW. THE PHL ACAR SOUNDING ALSO HAD DEW POINT

DEPRESSIONS OF 5-10C IN THE LOWEST 5K. WITH SOUNDINGS LIKE THAT

EVAPORATION AL COOLING SHOULD HELP MOST PLACES START AS SNOW ON

SATURDAY MORNING.

THE QUESTION THEN BECOMES FOR PLACES AROUND THE I95 CORRIDOR AND

SOUTHEAST HOW LONG BEFORE WARMER AIR ARRIVES. THE 00Z SOUNDING

925MB TEMPS UPWIND OF US ON AVERAGE WERE 1-2C COLDER THAN WHAT THE

MODELS WERE FORECASTING AND 0-1C COLDER AT 850MB. ALL THINGS BEING

EQUAL AND WITHOUT A STRONGER SYSTEM COMPENSATING FOR IT, WOULD

THINK THE MODELS SHOULD BE COLDER WITH THE 00Z RUN OR AT LEAST

COLDER THE FIRST HALF OF SATURDAY.

AT 500MB THE GFS FCST VERIFIED THE BEST WHILE AT 250MB THE GFS

AND ECMWF WERE CLOSE, THE NAM FAILED TO BIFURCATE THE STREAKS. THE

LATEST SREF RUN HAVE TRENDED WETTER VS WHITER SOUTHEAST OF THE

FALL LINE AND THIS SCENARIO IS LOOKING CLOSER TO THE LATE NOVEMBER

EVENT WHERE ELEVATION WAS THE KEY FOR SNOW. ALBEIT THE SOUNDINGS

WILL BE COLDER AND DRIER AT THE START EVERYWHERE. STILL TRYING TO

WRAP OUR HEADS ON HOW THE FORECAST SOUNDINGS ARE WARMING SO

EFFICIENTLY WITHOUT A BIG WIND PUSH FROM THE SOUTHEAST. THE LACK

OF A SURFACE HIGH (LIKE WE HAD NORTH OF NY STATE ON WEDNESDAY) MAY

BE THE REASON.

WE DID NOT CHANGE ANY OF THE PRESENT HEADLINES OR FORECAST

PENDING THE COMPLETE SUITE OF SOUNDING RUNS, BUT BASED ON THE

TREND WE ARE MOST CONFIDENT ABOUT THE CURRENT OUTCOME NORTHWEST OF

THE FALL LINE AND IT GETS SHAKIER IN THE I95 CORRIDOR, CONFIDENCE

GROWS AGAIN TOWARD THE COAST WHERE IT LOOKS LIKE A MAINLY RAIN

EVENT. CURRENT TEMPS ARE HOLDING WELL AND NO BIG CHANGES WERE MADE

THERE.

WINDS WILL RELAX AND ONLY SOME CIRRUS WILL STOP US FROM RADIATING

DURING THE FIRST PART OF THE NIGHT. WE HAVE LEANED TOWARD THE

COOLER STAT GUIDANCE AND WE HAVE PUT THE MINIMUM TEMPERATURE

AROUND MIDNIGHT. THE WEAK RIDGE AXIS WILL THEN PASS BY TO THE

NORTHEAST BY 06Z, AND THAT WILL ALLOW A SIGNIFICANT INCREASE IN

CLOUDS TO OCCUR. WARM AIR ADVECTION ABOVE THE SURFACE WON`T BE

SIGNIFICANT ENOUGH TO CAUSE MUCH OF AN OVERNIGHT RISE IN

TEMPERATURES (PERHAPS A LITTLE SOUTH), BUT THE CLOUDS WILL ALLOW

TEMPERATURES TO RISE A BIT DURING THE PRE-DAWN HOURS. SOME

ISENTROPIC LIFT BETWEEN I295 AND I300 WILL ARRIVE OVER SOUTHERN

AND WESTERN ZONES BY DAYBREAK, AND THE PRECIPITATION WOULD BE SNOW

EVERYWHERE IT FALLS. SNOWFALL AMOUNTS BY THE END OF THE FIRST

PERIOD SOUTH AND WEST ARE NOT FORECAST TO REACH ONE-HALF INCH.

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Man, the euro is def stronger than the 12z run, but just not in time for us se pa folks.

@24hrs (sun 0z, it's 988mbs), the12z had it 996. Def gets a stronger phase. Cape cashes in, not us... 6-10hrs slower and we'd be talking foot plus in some locations this way.

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I think I'm un-enthused enough to lower expectations for the Trenton area down to a coating-2 inches. Just too much that can go wrong which makes anything more than 2 rather unrealistic. Even if QPF is higher, it looks like the warm air will cut ratios such that 2" is the most that can be hoped for... and if QPF is lower, a coating is probably all they'll get.

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I think I'm un-enthused enough to lower expectations for the Trenton area down to a coating-2 inches. Just too much that can go wrong which makes anything more than 2 rather unrealistic. Even if QPF is higher, it looks like the warm air will cut ratios such that 2" is the most that can be hoped for... and if QPF is lower, a coating is probably all they'll get.

That's about where I'm heading at this point. C-2 along 95, 1-3 (probably optimistic) NW.

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6z gfs a lot drier:

Between the 1st wave out in central

Pa, and then the secondary taking over, we get screw jobbered, verbatim. I've been worried about this possibility.

Current radar this morning is almost a duplicate of the 6z GFS image you posted. On first look, I'm wondering who gets shafted by that dry slot in Virginia...

post-317-0-16832200-1356778143_thumb.jpg

post-317-0-84580900-1356778136_thumb.jpg

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