Jump to content
  • Member Statistics

    17,589
    Total Members
    7,904
    Most Online
    LopezElliana
    Newest Member
    LopezElliana
    Joined

December 14th and onward discussion thread


BullCityWx

Recommended Posts

  • Replies 744
  • Created
  • Last Reply

Yeah this run brings precip across the mountains maybe a little faster than other models. Its still a tough call because either one could happen, the models may be missing the speed of the warm air advection, if it gets here earlier then a little period of light snow is possible, and probably more significant ZR or sleet amounts before we warm up enough to go over to rain. Our hope is that the northeast Vortex is stronger than the models are giving credit for, that would mean all the moisture coming at is focused more toward us and not eastern Kentucky...would be a much more wintry threat I'd think.

If its higher moisture is right for central and eastern Ky, they may have a little problem with serious icing

After looking at the 7oo map I have a hard time believing the qpf map. That looks like a good amount for western NC.

Link to comment
Share on other sites

At 69 ZR is still along the I-40 corridor roughly from HKY to RDU, all points south have switched over to just plain rain. Again though better run on temps.

The temps are a function of the track of the weak surface wave, hence shift the track and warm front south a bit, and the temps are adjusted downward. With a track along the NC SC boarder, it would be conceivable that this would be a mostly frozen event for areas north of 40. A track through VA or along the NC VA boarder and the entire state is in the warm sector. This kind of reminds me of our clipper type system a week ago. While different in terms of origin, the modeling has some similarities. This wave looks a little more moisture rich, and is coming in from the west, vs northwest. But we saw the track shift north into VA, and even DC at this range, only to come back south within 60hrs. This run looks to take the impulse through the middle of the state, and heaviest QPF along the NC VA boarder, which would make sense. Now shift that track south 50-100 miles along the NC SC boarder, and most of NC would be in the mix for the duration.

Link to comment
Share on other sites

The temps are a function of the track of the weak surface wave, hence shift the track and warm front south a bit, and the temps are adjusted downward. With a track along the NC SC boarder, it would be conceivable that this would be a mostly frozen event for areas north of 40. A track through VA or along the NC VA boarder and the entire state is in the warm sector. This kind of reminds me of our clipper type system a week ago. While different in terms of origin, the modeling has some similarities. This wave looks a little more moisture rich, and is coming in from the west, vs northwest. But we saw the track shift north into VA, and even DC at this range, only to come back south within 60hrs. This run looks to take the impulse through the middle of the state, and heaviest QPF along the NC VA boarder, which would make sense. Now shift that track south 50-100 miles along the NC SC boarder, and most of NC would be in the mix for the duration.

Sure hope so, anything is plausible at this point. The drama of the NAM.

Link to comment
Share on other sites

i just have a hard time believing it goes that far north with so much confluence in the northeast from the PV

Agreed. I also don't think the model is handling the depth of this arctic air, or the northern extent of the snowfield across TN, KY, OH, or IN. In that regard, a stronger baroclinic zone may shape up further south/east than currently progged.

Link to comment
Share on other sites

the main thing to watch in future runs is the northeast vortex that the key between this being a minor event or possibly a warning criteria ice or snow event, especially if that qpf in ky were to move farther southeast.

FWIW looking at the ukmet for this event is has more qpf in western NC and keeps the midlevels colder longer.

Link to comment
Share on other sites

RDU is thinking a more southerly route (and this is before the18z NAM came out):

.SHORT TERM /WEDNESDAY INTO WEDNESDAY NIGHT/...

AS OF 215 PM MONDAY...

WEDNESDAY WILL CONTINUE TO BE VERY COLD AND DRY AS THE SURFACE RIDGE

WILL MOVE OVERHEAD DURING THE AFTERNOON. THIS WILL ALLOW THE CAA AND

SURFACE WINDS TO SUBSIDE. IN ADDITION... MODELS FAVOR AN INCREASE IN

HIGH CLOUDINESS DURING THE AFTERNOON ESPECIALLY OVER THE WESTERN

AREAS. THIS ALONG WITH THE PARTIAL THICKNESSES SUPPORT HIGHS IN THE

MID 30S NW RANGING TO NEAR 40 IN THE SE... SLIGHTLY UNDER MOS.

CLOUDS WILL INCREASE AND THICKEN WEDNESDAY NIGHT DUE TO WARM AIR

ADVECTION ESPECIALLY IN THE MID LEVELS. THE ARCTIC AIR MASS WILL

STILL BE IN PLACE OVER OUR REGION WEDNESDAY NIGHT AS THE H85 WARM

FRONT DEVELOPS OVER THE TN VALLEY INTO WESTERN NC. THIS BECOMES

PROBLEMATIC DUE TO THE POTENTIAL FOR LIGHT WAA PRECIPITATION TO

DEVELOP/OVERSPREAD AT LEAST THE NORTHWESTERN THIRD OF CENTRAL NC BY

DAYBREAK THUR.

MODELS HAVE TRENDED NORTHWARD WITH THE WEAK SURFACE WAVE TRACK IN

THE PAST 2 RUNS... WITH THE 12Z NAM/GFS NOW SHOWING ALL OF OUR

REGION GETTING INTO THE WARM SECTOR THURSDAY... WITH THE WAVE TRACK

FROM TN ENE ACROSS SOUTHERN VA. THIS APPEARS TOO AGGRESSIVE GIVEN

THE WEAK SURFACE WAVE AND THE AMOUNT OF ARCTIC AIR STILL IN PLACE

ESPECIALLY EAST OF THE BLUE RIDGE EARLY ON THURSDAY. HPC PREFERS A

COMPROMISE WAVE TRACK ACROSS TN INTO NC WHICH SUGGESTS MORE IN THE

WAY OF P-TYPE PROBLEMS... ESPECIALLY OVER THE NORTHERN THIRD OF THE

STATE THURS MORNING. FOR DETAILS... SEE THE THURSDAY DISCUSSION

BELOW. WE WILL BRING A CHANCE OF LIGHT SNOW INTO THE PIEDMONT AFTER

400 AM... AND KEEP THE EAST DRY. LOWS 28-32.

&&

Link to comment
Share on other sites

FWIW looking at the ukmet for this event is has more qpf in western NC and keeps the midlevels colder longer.

thats interesting. hopefully we will see the gfs trend better for the 18z run in a few. oh btw can you see where the wave tracks on the uk just for comparison?

Link to comment
Share on other sites

The temps are a function of the track of the weak surface wave, hence shift the track and warm front south a bit, and the temps are adjusted downward. With a track along the NC SC boarder, it would be conceivable that this would be a mostly frozen event for areas north of 40. A track through VA or along the NC VA boarder and the entire state is in the warm sector. This kind of reminds me of our clipper type system a week ago. While different in terms of origin, the modeling has some similarities. This wave looks a little more moisture rich, and is coming in from the west, vs northwest. But we saw the track shift north into VA, and even DC at this range, only to come back south within 60hrs. This run looks to take the impulse through the middle of the state, and heaviest QPF along the NC VA boarder, which would make sense. Now shift that track south 50-100 miles along the NC SC boarder, and most of NC would be in the mix for the duration.

Hope is kindled. Yesterday, the 18Z runs started a northerly trend, I think. Maybe today's is the start of the final trend... TO THE SOUTH!

Link to comment
Share on other sites

and almost no qpf (at least in n ga) :gun_bandana: colder and faster would be good, but heck, we need the moisture too :axe:

Patience...must let the pot simmer. First we get the low in the proper position, then we get the cold. Just have to let it bubble a while, lol. If we get a low with cold air that isn't just a distant memory, even if it is stale... over this cold ground...that is when we can see a turn over from just cold rain...of course it is apt to be a hell ice storm, if it is insitu :whistle:

It sure is nice out. That wind gives it a good bite. Does it take away the pain of this past endless summer? No...but it is a start :thumbsup: T

Link to comment
Share on other sites

WeatherNC, the NAM actually lays down an inch of snow for PGV before switching... :arrowhead:

Snow map and thickness from this run. If the timing is correct, highest impacts for the state would be between 1am and 1 pm Thursday. Depending how much, or if the bulk of the QPF can move through in that timeframe, there would likely be a swath of mostly SN with some IP on the northern fringe of the precip shield, and ZR south of that. This would be advisory criteria for areas just to the north of the triangle. Hour 72 is in question here as the thickness supports ZR, which could be a real mess if we see a quarter of an inch fall, more so to our NW around RWI. Shift this track south another 50-100 miles, and a good chunk of NC would see more sig impacts.

18znamsnow_SE072.gif

18znamp06thickpmsl_MA072.gif

Link to comment
Share on other sites

Snow map and thickness from this run. If the timing is correct, highest impacts for the state would be between 1am and 1 pm Thursday. Depending how much, or if the bulk of the QPF can move through in that timeframe, there would likely be a swath of mostly SN with some IP on the northern fringe of the precip shield, and ZR south of that. This would be advisory criteria for areas just to the north of the triangle. Hour 72 is in question here as the thickness supports ZR, which could be a real mess if we see a quarter of an inch fall, more so to our NW around RWI. Shift this track south another 50-100 miles, and a good chunk of NC would see more sig impacts.

18znamsnow_SE072.gif

18znamp06thickpmsl_MA072.gif

5 inches for KTRI - I certainly can't buy what the NAM is selling. These events, unfortunately don't work out well with WAA moisture this side of the Apps. Almost always is a little bit of snow/ice followed by rain. I guess the positive thing is, at least it's something to keep an eye on.

Link to comment
Share on other sites

Excerpt from the just issued AFD from FFC

NEXT SYSTEM APPROACHES THE REGION WEDNESDAY MORNING...SO HAVE

CONTINUED WITH CHANCE POPS IN THE NORTHWEST...WITH SLIGHT CHANCE

SPREADING SOUTH AND EAST. WITH TEMPERATURES EXPECTED TO STAY IN THE

30S OR BELOW ACROSS MUCH OF NORTH GEORGIA WEDNESDAY...AND MODELED

THICKNESS VALUES IN SUPPORT OF AN ICY MIXTURE...COULD SEE SOME

RAIN...FREEZING RAIN...SLEET MIXTURES EARLY WEDNESDAY AND AGAIN

WEDNESDAY NIGHT AND INTO THURSDAY. NO ACCUMULATIONS ARE EXPECTED AT

THIS TIME.

Link to comment
Share on other sites

Snow map and thickness from this run. If the timing is correct, highest impacts for the state would be between 1am and 1 pm Thursday. Depending how much, or if the bulk of the QPF can move through in that timeframe, there would likely be a swath of mostly SN with some IP on the northern fringe of the precip shield, and ZR south of that. This would be advisory criteria for areas just to the north of the triangle. Hour 72 is in question here as the thickness supports ZR, which could be a real mess if we see a quarter of an inch fall, more so to our NW around RWI. Shift this track south another 50-100 miles, and a good chunk of NC would see more sig impacts.

Bleh! Yet another north of I-40 event. I am hoping the NE vortex ends up a little stronger and south and also for the cold come in a bit stronger then progged so all of us can be in business.

Link to comment
Share on other sites

comparing the 18z nam and gfs at hr 42 it looks like the NE vortex is about 50 miles farther west on the gfs than the nam.

gfs at hr 48 has a larger mass of precip on the surface extending from Tn/ky border all the way into the GOM where the NAM just has it in the TN valley

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...