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December 19th-20 Storm Thread III


Baroclinic Zone

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Run the loop from 0 Z last night, huge changes, trend is our friend but will it matter? Sat Obs Radar time in the AM hope to get a piece of the CCB

Big changes but too little too late for us.

Maybe an inch in SE CT if things break right but offs for that are low.

Radar and satellite are going to look very impressive tomorrow afternoon but I think most of us will be left without much.

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GFS may seem a little too far southeast with the H5 close off, almost trended towards the NAM with the H5 positioning. Models have trended towards a quicker close off of the H5 low. This trend is our friend. Our vort max near TN and moving ENE right now is closing in on the coastline. Could be a very close call when it comes to amplification of the H5 trough. Taunton had 00z NAM, mentioned possible changes if the 00z suite trends towards the NAM, we have seen the GFS trend closer to the NAM with the H5 pattern. Could be a sign of a big potential storm, at least for Cape Cod, MA. I am sure everyone has seen how close Cape Cod, MA gets to the maximum QPF of almost 3" of liquid, this is before the warm front approaches from the east.

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.NEAR TERM /UNTIL 6 AM SUNDAY MORNING/...

NOT MUCH CHANGE FROM PREVIOUS FORECAST AS LATEST OBSERVATIONS AND

SATELLITE IMAGERY MATCHING UP NICELY WITH CURRENT FORECAST. ONLY

CHANGE WAS TO MODIFY HOURLY TEMPS/DEW PTS AND WINDS TO MATCH

CURRENT TRENDS.

AS FOR SUN NGT AND MON...NEW 00Z NAM COMING IN AT THE MOMENT AND

IS MORE AMPLIFIED WITH DEVELOPING OFFSHORE CYCLONE. 00Z NAM HAS UP

TO 0.50 INCHES OF LIQUID QPF THRU 00Z TUE FROM BOSTON TO

PROVIDENCE AND OVER AN INCH OF LIQUID QPF ACROSS THE CAPE AND

ISLANDS! MID LEVEL TROF TAKES ON A NEGATIVE TILT WITH EXPLOSIVE

CYCLOGENESIS SOUTHEAST OF THE 40N/70W BENCHMARK LATE SUN NGT AND

MON...ALONG WITH IMPRESSIVE COMMA HEAD PROJECTED OVER MUCH OF

SOUTHERN NEW ENGLAND. HOWEVER WITH THE MID LEVEL LOW ALSO TRACKING

SOUTH AND EAST OF THE BENCHMARK MID LEVEL FRONTOGENESIS AND

ASSOCIATED SNOW BANDING POTENTIAL SHOULD REMAIN

OFFSHORE...POSSIBLY CLIPPING THE CAPE AND ISLANDS. OBVIOUSLY WILL

HAVE TO WAIT AND REVIEW ALL OF THE 00Z MODEL GUIDANCE BEFORE

POSSIBLY CHANGING THE FORECAST FOR SUN NGT AND MON. STAY TUNED!

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Christmas storm is progressing across the plains at 120 hours. That's our next chance at snow in so called "God's Country" unless we pull an inch or two from retro or LES.

But at 156 hrs I think its about to be crushed by confluence...

Nogaps brings qpf onto the Cape. NAM and Nogaps...not exactly a marriage made in heaven...lol...

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