Jump to content
  • Member Statistics

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

Wednesday storm possiblities


Mitchel Volk

Recommended Posts

  • Replies 432
  • Created
  • Last Reply

There's some pretty heavy snow taking place right now near Atlanta, which models suggested would get brushed as the heavy snow/ice went south of them. I'd say that's a good sign for us down the road that perhaps this could be a bit west of the model consensus still.

And winter storm warnings were just extended to the northernmost counties in GA, implying more precip on the northern edge, at least down in GA.  A positive sign, at least. 

 

US.png

Link to comment
Share on other sites

 18z nam is a tad drier and moves precip out a bit faster. looks more like the 12z gfs run. no real surprise there

1-2" for much of Long Island particularly south/east, around 1" for the city, coating/dusting north and west. South of I-195 and east of I-95, maybe some spots to 3". Looks good to me. We will need a lot of luck to see more than this.

Link to comment
Share on other sites

1-2" for much of Long Island particularly south/east, around 1" for the city, coating/dusting north and west. South of I-195 and east of I-95, maybe some spots to 3". Looks good to me. We will need a lot of luck to see more than this.

JM, so we are good for our 1-2 inches. Interestingly as one travels South to North on the Meadowbrook, snow will diminish which is the opposite we usually see.

Link to comment
Share on other sites

a half inch would put me ay 30 for the year, i hope we get that

I'm sitting on 29.5" also.  30" sounds so much better.  We're right on the 1" line from the NWS and anything that falls will accumulate and make everything look beautiful again.  Could be pretty slick out there tonight and in the morning. 

Link to comment
Share on other sites

I'm sitting on 29.5" also.  30" sounds so much better.  We're right on the 1" line from the NWS and anything that falls will accumulate and make everything look beautiful again.  Could be pretty slick out there tonight and in the morning. 

I'm 2" from 30". I'm still fairly pessimistic about this one but it'll be interesting to watch unfold. It could have some nice surprises down in S NJ and over the twin forks. I think dry air still eats a lot of it up northwest of there. The air continues to get drier-dew is now -11 at Central Park.

Link to comment
Share on other sites

I'm 2" from 30". I'm still fairly pessimistic about this one but it'll be interesting to watch unfold. It could have some nice surprises down in S NJ and over the twin forks. I think dry air still eats a lot of it up northwest of there. The air continues to get drier-dew is now -11 at Central Park.

 

The NWS in Birmingham echoed your dewpoint concerns this morning in their AFD:

 

"AS THE OVERRUNNING AND ISENTROPIC LIFT CONTINUE TO

INCREASE...THE COLUMN WILL BEGIN TO MOISTEN FROM THE TOP DOWN. IT`S

INTERESTING THOUGH THAT DEWPOINTS ARE SO VERY DRY ACROSS MUCH OF THE

REGION AT THE CURRENT TIME...WITH BELOW ZERO DEWPOINTS IN OUR

NORTHERN COUNTIES AND SINGLE DIGITS ABOVE ZERO SOUTH. IN

FACT...THOSE DEWPOINTS ARE WAY DRIER THAN ANY OF THE FORECAST

GUIDANCE IS CURRENTLY PICKING UP ON. WILL THIS IMPACT OUR SNOWFALL

AMOUNTS WITH THIS SYSTEM TODAY? WE`LL HAVE TO SEE AS WE GO THROUGH

THE DAY. JUST AS AN EXAMPLE HOWEVER...OBSERVATION LOCATIONS IN SW

MISSISSIPPI AND LOUISIANA HAD SINGLE DIGIT DEWPOINTS...BUT WERE ABLE

TO RISE INTO THE UPPER TEENS VERY QUICKLY AS PRECIPITATION REACHED

THE SURFACE. WE ARE EXPECTING SOMETHING VERY SIMILAR TO OCCUR ACROSS

THE SOUTHERN PORTIONS OF OUR CWA AS THE COLUMN MOISTENS AND PRECIP

REACHES THE SURFACE. THE DRIER THAN EXPECTED AIRMASS MAY ONLY

PROLONG THE INEVITABLE BY A COUPLE OF HOURS...AS SIGNIFICANT AMOUNTS

OF WINTER PRECIP REMAIN ON THE TABLE THIS MORNING."

 

FYI, after this discussion came out, Birmingham had a 0 degree dewpoint at 9AM that shot up to 14 by 11:00 with snow, and the NWS hoisted WSW's for counties on the northern fringe that were expected to only get a dusting. Granted, WSW criteria down there is laughable by our standards, but perhaps our coastal areas can eek out a 2-3 inch surprise like they did.

Link to comment
Share on other sites

I'm starting to wonder if that big ridge out in the atlantic could be offering resistance for this to shoot ots. Just enough for a graze. Think thats possible?

If the system was a little more consolidated and slower, this could have rounded the corner and given us all a nice storm. Notice though how sheared looking the precip is down south and the positive tilt of the trough-that will cause it to turn a little but mainly head ENE out to sea. The pattern is too progressive to allow a turn and the energy is too spread out to allow for a powerful storm. It's just a ton of overrunning mainly from the warm Gulf over the cold dome which is abnormally far south. In Orlando today it's almost 80F-that air is overrunning air in the low 20s over the Carolinas and GA and triggering tons of snow/ice.

Link to comment
Share on other sites

Mount holly

THE MAIN SHORT WAVE ROUNDING THE BASE OF THE UPPER-LEVEL TROUGH

APPEARS TO BE SLOWING SOME MORE, WHICH LEADS TO THE TROUGH AXIS

ORIENTATION CHANGING SOME. THIS THEREFORE AFFECTS THE DOWNSTREAM

FLOW SUCH THAT ASSOCIATED LIFT ESPECIALLY IN THE 700-850 MB LAYER

SHIFTS FARTHER NORTHWEST. THE MODEL GUIDANCE IS IN GOOD AGREEMENT IN

BRINGING A RIBBON OF 700-850 MB FRONTOGENETIC FORCING ACROSS THE

DELMARVA AND SOUTHERN NEW JERSEY. THIS LIFT ALSO REACHES INTO A GOOD

PORTION OF THE INTERSTATE 95 CORRIDOR. AN EXAMINATION OF THE

FORECAST SOUNDINGS AS WELL AS CROSS SECTIONS SHOW THE AIRMASS BELOW

700 MB MOISTENING UP WITH TIME. DESPITE RATHER LOW SURFACE DEW

POINTS, SOME SNOW HAS BEEN REACHING THE GROUND THIS AFTERNOON WELL

TO OUR SOUTHWEST. THE 12Z STERLING, VA RAOB SHOWED THE MOISTURE

ABOVE 700 MB HOWEVER BELOW THIS LEVEL IT IS VERY DRY. THE ASSOCIATED

LIFT SHOULD EVENTUALLY OVERCOME THIS AS THE MOISTURE ABOVE IS

SQUEEZED OUT. IN ADDITION, THE SNOW GROWTH ZONE IS LOWER TO THE

GROUND AND THE MAXIMUM LIFT INTERSECTS INTO AT LEAST A PORTION OF

THIS DURING THE NIGHT. THIS WILL LEAD TO A RATHER FLUFFY SNOWFALL,

AND POTENTIALLY AN AREA OF HEAVIER SNOWFALL RATES. ONE OF THE

CHALLENGES THOUGH PERTAINS TO THE NORTH AND NORTHWEST EDGE OF THE

SNOW SHIELD REGARDING HOW MUCH ENDS UP NOT REACHING THE GROUND. THE

NAM MAY BE TO WET ESPECIALLY ON ITS NORTHWEST EDGE AND ITS HIGHER

THAN REALITY DEW POINTS COULD BE A FACTOR IN ITS HIGHER QPF

ESPECIALLY FARTHER NORTHWEST. IT DOES APPEAR THERE WILL BE A SHARP

WESTERN EDGE FROM SNOW TO NO SNOW, AND WE TRIED TO DEPICT THIS IN

OUR POPS/QPF AND SNOW AMOUNTS. IT IS VERY COLD, THEREFORE THE SNOW

WILL QUICKLY STICK TO ALL UNTREATED SURFACES.

SINCE THERE IS BETTER AGREEMENT ON THE PRECIPITATION SHIELD AMONG

THE MODELS AND AFTER COLLABORATION THIS AFTERNOON, THE WINTER

WEATHER ADVISORY WAS EXPANDED WEST AND NORTHWARD A TIER OR SO OF

COUNTIES/ZONES. BASED ON THE QPF FORECAST AND USING HIGHER RATIOS,

WE UPGRADED SUSSEX COUNTY IN DELAWARE AND CAPE MAY COUNTY IN NEW

JERSEY TO A WINTER STORM WARNING. THE START TIME IS A BIT IFFY AS IT

MAY A TAKE LONGER FOR THE SNOW TO REALLY GET GOING ESPECIALLY

FARTHER NORTH ACROSS THE ADVISORY AREA. FOR THE AREAS ADJACENT TO

THE ADVISORY IT LOOKS LIKE AROUND AN INCH OF SNOW ACCUMULATES,

HOWEVER WE WILL HAVE TO WATCH THE WESTERN EDGE ALONG WITH RATIOS.

GIVEN LOWER CONFIDENCE FARTHER WEST, WE OPTED TO NOT INCLUDE THESE

AREAS ATTM IN THE ADVISORY AND ISSUED A SPECIAL WEATHER STATEMENT.

AS FOR TEMPERATURES, WE USED A NAM/GFS MOS BLEND THEN MADE SOME

MAINLY MINOR TWEAKS. THE HOURLY GRIDS INCORPORATED THE LAMP/LAV

GUIDANCE INTO THIS EVENING TO HELP ASSIST WITH TRENDS.

Link to comment
Share on other sites

Upton;

 

OVERALL...A LIGHT SNOW EVENT IS FORECAST...WITH LOW-END ADVISORY
CRITERIA LIKELY TO OCCUR ACROSS SUFFOLK COUNTY NY...MAINLY THE
EAST END. TOWARD NYC...AROUND AN INCH IS POSSIBLE. DESPITE
RELATIVELY LOW QPF VALUES...THE SNOW/WATER EQUIV SHOULD BE UP
AROUND 20:1 AT TIMES DUE TO THE COLD AIRMASS IN PLACE AND A RATHER
DEEP DENDRITIC GROWTH ZONE. WORST CASE SCENARIO FOR NYC IS ABOUT 3
INCHES...WITH 5 ACROSS EASTERNMOST LONG ISLAND
. HELD OFF ON THE
ADVISORY FOR SOUTHERN NEW LONDON COUNTY AT THIS TIME...AND EVENING
SHIFT CAN REASSESS THE POTENTIAL NEED FOR ONE THERE.

Link to comment
Share on other sites

Archived

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

  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...