Jump to content
  • Member Statistics

    17,606
    Total Members
    7,904
    Most Online
    ArlyDude
    Newest Member
    ArlyDude
    Joined

Potential coastal storm 1/26-28


robertgny

Recommended Posts

  • Replies 1.2k
  • Created
  • Last Reply

Upton 10 pm update&&

.LONG TERM /MONDAY THROUGH SATURDAY/...

-- Changed Discussion --

NOTE ON LATEST MODEL TRENDS FOR STORM SYSTEM MONDAY-TUESDAY. THE

18Z AND 00Z NAM HAVE MOVED TO A TRACK/IMPACT SIMILAR TO THE 12Z

GFS...WITH MOST OF THE IMPACT E OF THE CT/NY STATE LINE. THE 18Z

GFS THOUGH HAS A SOLUTION SIMILAR TO THE 12Z ECMWF/CMC-GLOBAL/NAM

WITH A POTENTIALLY POTENT STORM IMPACTING THE ENTIRE CWA. NO

CHANGES TO PREVIOUS THINKING...WHICH FOLLOWS BELOW...BASED ON

THESE TRENDS.

MODELS ARE TRENDING FARTHER NW REGARDING A STORM THAT IS PROGGED TO

EMERGE OFF THE CAROLINA COAST DURING MONDAY. AS THE STORM HEADS TO

THE NORTH...AN ASSOCIATED UPPER TROUGH BECOMES STRONGLY NEGATIVELY

TILTED BEFORE A 500 MB LOW CLOSES SOUTH OF US AT SOME POINT LATE

MONDAY NIGHT INTO TUESDAY. THIS WOULD DRAW THE STORM CLOSER TOWARDS

IT...EFFECTIVELY SLOWING DOWN ITS PROGRESS TO THE NE IN SPITE OF A

BLOCKING LOW OVER THE CANADIAN MARITIMES MOVING AWAY.

HEAVY SNOW AND STRONG WINDS ARE BECOMING INCREASINGLY LIKELY FOR AT

LEAST EASTERN PORTIONS OF THE CWA. WITH THE UPPER LOW CLOSING OFF

AND DEEPENING OF THE STORM...MESOSCALE BANDING BECOMES MORE LIKELY

AS WELL...BUT IT IS VERY DIFFICULT TO SAY THIS FAR OUT IN ADVANCE

WHERE IT WOULD SET UP. BUT BASED THE MID LEVEL FRONTOGENESIS AND

DEFORMATION THAT MODELS ARE SHOWING...BANDED PRECIPITATION WOULD

MOVE AT LEAST IN THE VICINITY OF THE CWA...PERHAPS LATE MONDAY

NIGHT INTO TUESDAY MORNING. PRECIPITATION TYPE LOOKS LIKE TO BE

ALL SNOW. RIGHT NOW ONLY A SLIGHT CHANCE THAT WARM AIR GETS

WRAPPED INTO THIS SYSTEM AND CAUSES MIXED PRECIPITATION TYPES FOR

EASTERN SECTIONS. SHOULD MODELS CONTINUE THE NW TREND OF THE

STORM`S TRACK...PRECIPITATION TYPE ISSUES COULD BE A BIGGER

CONCERN. WHAT IS MORE CERTAIN IS THAT A COLD AIR MASS WILL ALREADY

BE IN PLACE WITH HIGH PRESSURE SHIFTING THROUGH SE CANADA MONDAY

INTO TUESDAY...PROMOTING PRECIPITATION TYPE OF SNOW.

DID NOT WANT TO TREND UPWARD TOO MUCH REGARDING POPS AND TOO HIGH

WITH QPF/SNOW TOTALS AT THIS POINT AS LIKELY POPS ARE NOT

CURRENTLY FORECAST UNTIL THE 5TH PERIOD...BUT WENT FAIRLY CLOSE TO

RFC AND WPC GUIDANCE...WHICH SEEMS LIKE A GOOD COMPROMISE FROM THE

HIGH QPF OUTPUT FROM ECMWF AND NAM...AND THE OTHER MODELS THAT DO

NOT SHOW AS MUCH. BUT BASED ON THE NW TREND OF THE STORM...DID

MAKE SOME UPWARD ADJUSTMENTS MAINLY WEST OF EASTERN LONG ISLAND

AND SE CT. FORECAST WINDS DURING THIS STORM COULD BE ON THE

CONSERVATIVE SIDE AS WELL...BUT FOR NOW...THINKING IS THAT EASTERN

AND OTHER COASTAL SECTIONS HAVE A DECENT CHANCE OF SEEING GUSTS

OVER 40 MPH. TOO EARLY FOR ANY HEADLINES REGARDING THE SNOW AND

WIND POTENTIAL...BUT WILL ADDRESS AT LEAST THE SNOW ASPECT IN THE

HWO AS WARNING CRITERIA SNOWFALL FOR AT LEAST SOMEWHERE IN THE CWA

IS INCREASING IN LIKELIHOOD.

BEHIND THE STORM...DRY WEATHER WEDNESDAY AND THURSDAY...THEN A

WEAKER LOW AFFECTS US THURSDAY NIGHT INTO FRIDAY. CAPPED POPS A

CHANCE FOR SNOW...WITH PRECIPITATION MORE LIKELY TO BE SNOW...BUT

MIXED PRECIPITATION NOT OUT OF THE QUESTION.

-- End Changed Discussion --

Only the first paragraph is new (bolded part) - the rest was in the 4 pm update..

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

Guest
This topic is now closed to further replies.
  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...