Jump to content
  • Member Statistics

    17,515
    Total Members
    7,904
    Most Online
    amirah5
    Newest Member
    amirah5
    Joined

Christmas Storm VI


Cold Rain

Recommended Posts

  • Replies 1k
  • Created
  • Last Reply

KILM AFD Valid 5:40 this Morning....

Current Obs are 27.7 & clear, (forcasted to get into the 50's, though I cannot Imagine a 30 degree rise today, no-way, no how!)

Windchill is 28.0

Humidity at 100%, (this is good right?)

Dew point setting at 28.00 currently..

Wind calm but very/very light out of the n/NE

pressure 30.09 inches & steady...

WSW has been hoisted for the KILM Areas this morning.....

Now onto KILM Local AFD........

Synopsis...

..significant winter storm to affect the eastern Carolinas...

Low pressure will take a track across the northern Gulf of Mexico

today. Low pressure will then turn up the southeast coast and

intensify tonight and Sunday and then bomb as it moves further up

the East Coast Sunday night and Monday. Rain will change to snow

late tonight or Sunday morning. Significant snow accumulations are

possible. Arctic high pressure will bring dry and unseasonably cold

conditions Monday and Tuesday...followed by a warming trend to close

out the year.

&&

Near term /through tonight/...

as of 3 am Saturday...Winter Storm Watch for all but Georgetown late

tonight into Sun night. Most of the models are latching onto a

solution that would bring a significant snow to the forecast area

beginning late tonight. Accumulating snow should end from SW to NE

during sun...but may persist into Sun night across the Cape Fear

region. This forecast is leaning heavily on the trend toward a

stronger solution and is preferred. As modified Arctic air moved

across the Atlantic earlier in the week...pre-conditioning began

offshore of the East Coast. The Atlantic surface cyclone

intensification index is pointing to explosive development once low

pressure reaches these waters. Therefore...when low pressure...

currently just beginning its trek across the northern Gulf of

Mexico...moves off the coast of Florida/Georgia this evening...it should begin to

intensify more rapidly than models had previously indicated.

Also...fgen in the 800 mb-7 layer is also pointing to more intense

banding of snow on the west side of developing low pressure. Low

pressure should be 150 miles east of Cape Fear by end of period...

drawing progressively colder air into the forecast area as it moves

north and up the coast. Model profiles showing near saturation in the

critical dendritic growth zone with the column cooling sharply...

lastly at the coast. Rain should change to snow around 06z for

westernmost areas with the changeover progressing to the coast Sun

morning. Still enough uncertainty in evolution and timing of

changeover and resulting snowfall accumulations to hold off on

winter storm warnings with this package.

&&

Short term /Sunday through Sunday night/...

as of 3 am Saturday...day 2 remains a high-impact...but rather

low-confidence forecast. Finally seeing the models catch up with

the intensity of the southern stream upper low over Texas...and

the heavily pre-conditioned environment over the Gulf

Stream...with even the NAM showing a healthy surface low

developing off the southeast coast by 06z sun.

In spite of the more consistent model forecasts this event still

holds a lot of question Marks about the timing of a changeover

from rain to snow. Expect the cold air to arrive Sunday morning

and the changeover to take place from north to south as the low

levels cool...with most if not all the County Warning Area in snow by noon.

A stronger system closer to the coast means that precipitation and snow

amounts have been increased from the previous forecast. Heaviest

amounts will be in the far northern counties...where we could see

2-3 inches with isolated higher amounts in parts of Bladen and

Pender counties. Look for most of the snow to fall Sunday morning

inland...and Sunday afternoon near the coast. Latest snow amount

grids give US 1-2 inches along a corridor from the Florence area

into the Cape Fear region...with only Georgetown County unlikely

to get an inch of snow.

Will raise a Winter Storm Watch at this time for all but

Georgetown County. Confidence is highest in the far northern

counties but not the 80 percent required for a warning.

Residual moisture should exit the coast Sunday night with clearing

skies and very cold air building in on northwest winds. Given the

amount of wind expected...low temperatures will not go as low as the

850 mb temperatures (-9c) might suggest...with lows dipping into the lower

20s in most areas.

In other words, THEY, (NWS) still doesn't have a firm solution on what's going to happen?

We "could" start ALL snow, or a short rain/changeover QUICKLY as the Low bombs of the coast?

TIA

CT @ (KILM)

Link to comment
Share on other sites

http://keithrogersho...ap11Fronts.html

Look for 11.10 Stationary fronts

But me no Met also Jason!!

THANKS Man! WOW...so if I am reading everything correctly, this bodes well for you and I, if it sets up where it is showing? You are talking about a constant array of snow showers nickel and diming us to death? I know there has to be a caveat to where that sucker is located. For instance...if this is sitting over the top of my house, do I need to be to the east or west of the stationary front to reap the full benefits of a raging snow system? Ahh...crazy times ahead bro...

Link to comment
Share on other sites

I can already tell in terms of our local TV market that the storm coverage will be an epic fail due to it being Christmas...There's only 1 station that's doing their normal Saturday Morning show and she just showed a map that said WNC would get between 1-2 inches of snow. :axe:

At least we got Andy and Kendra (FOX Carolina) posting updates on their blog.

Link to comment
Share on other sites

Can someone relay the above map to laymen's terms please. I am still learning. So what exactly does the 87 mean for example?

If you are referring to the map I posted then the 87 means .87" of liquid equivalent precip. By very rough guestimates .10" of rain can equal 1" of snow.

Link to comment
Share on other sites

Latest 6z GFS precip thru 72 hours. This one is going to be fun folks...

06zgfsp72int072.gif

Merry Christmas Dawson! Appreciate you keeping us Atlanta folks grounded! I keep seeing where FFC says a mix this afternoon then all snow? I don't see how the column will go snow, mix, then back to snow?? I think this is keeping them from upping the totals as well.

Thoughts?

Link to comment
Share on other sites

And also out of step with the Raleigh Weather Service's expectations. They are saying for us to look for heavy banding and big accumulations along and east of I-95. There's not a bit of that in HPC's map. Interesting how, even at this late hour in the game, this storm continues to mystify.

Link to comment
Share on other sites

And also out of step with the Raleigh Weather Service's expectations. They are saying for us to look for heavy banding and big accumulations along and east of I-95. There's not a bit of that in HPC's map. Interesting how, even at this late hour in the game, this storm continues to mystify.

I don't think it's so much as that as it's people playing catch up with this system. Things will start to change rapidly by the afternoon if we continue on the current path. There will be a LOT of changes as the day progresses.

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...