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Jan 4-6 Coastal Bomb


Baroclinic Zone

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WPC Discussion this morning

PREFERENCE: BLEND OF THE 12Z GFS, 00Z ECMWF, 06Z GEFS, 00Z EC ENS
CONFIDENCE: AVERAGE

MODEL TRENDS CONTINUE TO BE TO GRADUALLY NUDGE THE POSITION OF THE
EVOLVING CYCLONE FURTHER WEST. THIS HAS BEEN APPARENT ON THE 12Z
GFS AND NAM...AND IS PRETTY CONSISTENT ACROSS THE SPECTRUM OF
AVAILABLE MODELS. OVER THE PAST THREE CYCLES (02/00Z TO
03/00Z)...THE ECMWF ENSEMBLE HAS NUDGED THE POSITION OF THE
SURFACE LOW ON THURSDAY MORNING ABOUT 60MI TO THE WSW INDICATING A
WESTWARD AND SLIGHTLY SLOWER TREND OVERALL...AND THIS TREND
MAGNITUDE IS SIMILAR TO OTHER MODELS.


CONFIDENCE IN THE WESTWARD TREND IS INCREASED SLIGHTLY BY THE
LATEST GOES-16 WATER VAPOR LOOPS WHICH SHOW THE BASE OF THE
EJECTING WAVE IN THE SOUTHEAST TODAY GENERALLY STAYING NORTH OF
THE GULF OF MEXICO...
AND THE 12Z NAM AND GFS INITIALIZING A LITTLE
TOO LOW WITH 500MB HEIGHTS IN NERN NEW ENGLAND AND THE CANADIAN
MARITIMES (20M TOO LOW MAINE TO NOVA SCOTIA). A SLIGHT NORTHWARD
TREND IN THE EJECTING WAVE...AND A MORE AMPLIFIED UPSTREAM
RIDGE...WOULD TEND TO FAVOR A SLIGHTLY SLOWER/DEEPER SYSTEM THAT
IS IN CLOSER PROXIMITY TO THE COAST. THE 12Z NAM AND GFS DID MAKE
SOME MINOR ADJUSTMENTS TO THE NORTH WITH THE EJECTING WAVE.


THE 12Z NAM CONTINUES TO PRODUCE THE MOST PRECIPITATION IN THE
COLD SECTOR AS THE LOW PUSHES UP THE COAST...AND THIS IS A TYPICAL
BIAS IN THE MODEL. IT IS ALSO FURTHEST WEST WITH THE SURFACE
LOW...ALTHOUGH THE MODELS OVERALL HAVE CONVERGED OVER THE PAST
COUPLE MODEL CYCLES.
 REMAINING DETAIL DIFFERENCES WOULD AFFECT
SOME SENSIBLE WEATHER IMPACTS ALONG THE PTYPE AND PRECIP
GRADIENTS...SO TRENDS OVER THE NEXT COUPLE MODEL CYCLES WILL STILL
BE IMPORTANT TO MONITOR.

A USAF RECONNAISSANCE PLANE IS SCHEDULED TO SAMPLE THE LOW OFF THE
SOUTHEAST ATLANTIC COAST THIS EVENING AS THE LOW IS LIKELY TO BE
RAPIDLY DEEPENING. THESE ADDITIONAL OBSERVATIONS MAY HELP NARROW
THE MODEL SPREAD A LITTLE FURTHER...PARTICULARLY AS ENSEMBLE
SENSITIVITY ANALYSIS SHOWS THE ULTIMATE LOW TRACK AND TIMING IS
SENSITIVE TO CONDITIONS OFF THE COASTAL CAROLINAS THIS EVENING
.


OTHERWISE...THE 12Z GFS...06Z GEFS...AND 00Z ECMWF AND EC ENS MEAN
APPEAR TO OFFER SIMILAR SOLUTIONS WITH THEIR MASS FIELDS AND VERY
SIMILAR LOW TRACKS AND INTENSITIES. THEREFORE A BLEND OF THESE
MODELS IS PREFERRED FOR THIS SYSTEM. HOWEVER...STORM STRUCTURE
WILL PLAY A ROLE IN QPF DISTRIBUTION AND BANDING
. FOR MORE ON
THAT...PLEASE REFER TO THE QPF AND HEAVY SNOW DISCUSSIONS FROM WPC.

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13 minutes ago, bboughton said:

OT but Politico does some really good stuff. And some really bad stuff. This is really bad stuff. But he’s not even a meteorologist. He’s just a weenie. 

Maybe he was referring to the hype being blown out of proportion because the storm really skims the major cities  (other than New England).  Most people don't understand barometric pressures etc. etc. and how epic this system is relative to climatology.  That is all I can give him in his defense....

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51 minutes ago, Hazey said:

This has Groundhog day 76' written all over it for up here. Disastah... Hours and Hours of 70mph+ gusts. Bye bye power :(

The Storm That Drowned Bangor.   Coastal Hancock County (Stonington, IIRC) recorded a southerly gust of 115 mph in that one.  All that southerly wind blew so much water up the Penobscot estuary that downtown BGR saw the level rise 15 feet in 15 minutes, drowning about 200 cars in the Kenduskeag parking lots.  (Almost drowned a young woman as well, but a fellow- total stranger to the woman - swam out and got her to safety.  6 months later they got married, just like in the romance novels but this actually happened.)  With the late morning wind shift, BGR temp plummeted from 57 to 1, destroying any chance of fixing the submerged vehicles.  CAR barometer dropped to 957, their lowest on record, and they may have been east of the center.  In Ft. Kent we dropped from 46 during the downpour gales to -11 that evening, 44 at 1 PM to -6 at 6 PM.  The ice holes on public roads there were spectacular, and the logging roads west of Allagash were truck-breakers for the rest of winter.
Certainly hope you don't get a repeat.  Hope that we don't, either.


Was gonna say...nothin like those Jun and Jul bombs.

If those fake warm-season bombs had included 7/20/96, they would've at least had a bit of credibility.  That was MWN's windiest day in met summer, probably by a significant margin, with an average velocity of 99 mph over the 24 hours.  Must've been something deep in the vicinity.

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Compared to 0z, 12z Euro looks initially a tick west thru 24 hours... then trajectory is more easterly so ends up a tick farther southeast from the BM by 30 hours

BOS qpf 1.1-1.2 on 12z run up from ~ 1.0 on 0z run

0.5 qpf past Worcester, a tick further west compared to 0z run

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34 minutes ago, weathafella said:

No matter how you slice it, it appears I’m going to get shellacked.  Psyched!  Where’s Steve?

KOWD, looks like we're in the same boat.  I'm a newbie here and my knowledge level is enthusiast at best, so please excuse my ignorance...but does Blue Hills area have any influence on weather/precip for our location, or is it too small?  

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