Jump to content
  • Member Statistics

    17,608
    Total Members
    7,904
    Most Online
    Vesuvius
    Newest Member
    Vesuvius
    Joined

Winter Med Range Discussion days 3-10 pbp II


buckeyefan1

Recommended Posts

  • Replies 3.4k
  • Created
  • Last Reply

MESOSCALE DISCUSSION 0069
NWS STORM PREDICTION CENTER NORMAN OK
0909 AM CST MON FEB 16 2015

AREAS AFFECTED...A LARGE PART OF TN

CONCERNING...WINTER MIXED PRECIPITATION

VALID 161509Z - 162015Z

SUMMARY...FREEZING RAIN AND SLEET WILL CONTINUE SUPPORTING
SUBSTANTIAL ICING ACROSS MUCH OF TN INTO THE AFTERNOON...WITH THE
PRECIPITATION SPREADING EWD WITH TIME.

DISCUSSION...SFC OBSERVATIONS ARE INDICATING WIDESPREAD SLEET AND
FREEZING RAIN ASSOCIATED WITH A CONTINUOUS SHIELD OF PRECIPITATION
EXTENDING FROM THE MID-SOUTH REGION TO MIDDLE TN. WITH NQA AND OHX
VWPS DEPICTING NOTABLE VEERING OF WIND DIRECTION WITH HEIGHT IN THE
LOWER TROPOSPHERE...WAA IS STRONG ACROSS THE AREA. RELATED STRONG
ISENTROPIC ASCENT WILL CONTINUE IN PROXIMITY TO A LLJ THAT WILL
GRADUALLY SHIFT EWD INTO THE AFTERNOON...WITH THE
ASCENT/PRECIPITATION SPREADING TOWARD THE APPALACHIANS.

THE 12Z BNA RAOB SAMPLES AN ELEVATED WARM LAYER JUST ABOVE H85
SURMOUNTING DEEP SUB-FREEZING AIR...SUPPORTING SLEET.
HOWEVER...ELEVATED WAA-ENHANCED WARMING WILL ALSO HAVE A PROPENSITY
TO MELT DESCENDING HYDROMETEORS TO SUPPORT AREAS OF FREEZING RAIN
ACROSS THE REGION...AND LOCAL-AREA/UPSTREAM OBSERVATIONS SUGGEST
FREEZING RAIN RATES OF 0.05-0.10 INCH PER HOUR THIS MORNING. SLEET
ACCUMULATION RATES MAY REACH NEAR A QUARTER INCH PER HOUR.
SUBSTANTIAL ICING WILL LIKELY RESULT FROM THESE FREEZING RAIN/SLEET
RATES...ESPECIALLY IN ANY CONVECTIVE ELEMENTS.

SHORT-RANGE FORECAST SOUNDINGS DO INDICATE NEAR-SFC WARMING
SUPPORTING A TRANSITION TO PURE LIQUID RAIN ACROSS SRN PARTS OF
MIDDLE AND SERN TN THIS AFTERNOON. HOWEVER...OBSERVATIONS SHOW A
VERY DRY AIR MASS IN PLACE -- AS REPRESENTED BY SFC DEWPOINTS FROM
THE UPPER SINGLE DIGITS TO THE TEENS -- AND RELATED WET-BULB COOLING
MAY OFFSET SFC-LOW PRECEDING WAA AND VERY MODEST DIURNAL HEATING. AS
SUCH...IT IS POSSIBLE THAT FROZEN PRECIPITATION MAY PREDOMINATE
REGION-WIDE. ELSEWHERE...PRECIPITATION WILL BEGIN TAPERING OFF FROM
WEST TO EAST ACROSS PARTS OF THE MID-SOUTH BY MID-AFTERNOON...AS
LARGE-SCALE ASCENT SHIFTS EWD.

Link to comment
Share on other sites

With no blocking, it doesn't matter how good storms look 5, or even 3 days out, as we are currently dealing with! Why would the Sat storm not go north and crush DC , again? What has changed?

There will be another cold air mass in place and this time lots of snow coverage just to the north. Insitu CAD would have some real power (especially for your area). **but I will have to admit you'll still want to be north of any low; if not then you'll still be toast.  

Link to comment
Share on other sites

With no blocking, it doesn't matter how good storms look 5, or even 3 days out, as we are currently dealing with! Why would the Sat storm not go north and crush DC , again? What has changed?

Beat me to it Mack! We take the bait every time. This storm has ZERO chance of happening unless some blocking develops to hold the cold and storm track down our way. If not, it will head north like every other storm ever has without blocking. Our current "storm" has trended hundreds of miles north just over the past 2 days. Next weekend has MA to NE written all over it without some good blocking. Besides that; GSP temps for the weekend are calling for 45 and 51 - no snow with that for sure.

Link to comment
Share on other sites

Well, the storm today looks like it will be a pretty big deal for NC. 

You are correct; BUT, we're talking about what is currently being modeled for next weekend. Not two days ago this current storm was going to be a big deal for more than just NC (not everone on the board lives in NC). But in reality, GA and SC are getting the screw job (either all ice or nothing at all). So based on what we are seeing NOW (a boderline snow/ice for non mtn locations) for the coming weekend, without blocking, how do you think reality will turn out (remember just a few days ago people were worried about suppression as today's system was being modeled much further south)? This one will be a no go for us without blocking.

Link to comment
Share on other sites

You are correct; BUT, we're talking about what is currently being modeled for next weekend. Not two days ago this current storm was going to be a big deal for more than just NC (not everone on the board lives in NC). But in reality, GA and SC are getting the screw job (either all ice or nothing at all). So based on what we are seeing NOW (a boderline snow/ice for non mtn locations) for the coming weekend, without blocking, how do you think reality will turn out (remember just a few days ago people were worried about suppression as today's system was being modeled much further south)? This one will be a no go for us without blocking.

good analysis. Just 48 hours ago the mountains look to see a foot of snow then all of a sudden the storm moves north and know we might see ice or just plain rain.
Link to comment
Share on other sites

You are correct; BUT, we're talking about what is currently being modeled for next weekend. Not two days ago this current storm was going to be a big deal for more than just NC (not everone on the board lives in NC). But in reality, GA and SC are getting the screw job (either all ice or nothing at all). So based on what we are seeing NOW (a boderline snow/ice for non mtn locations) for the coming weekend, without blocking, how do you think reality will turn out (remember just a few days ago people were worried about suppression as today's system was being modeled much further south)? This one will be a no go for us without blocking.

 

Why couldn't it work out like today's storm? 

Link to comment
Share on other sites

Why couldn't it work out like today's storm? 

 

Think about your question and reread my post. Today's storm isn't working out for almost all of us, as it was modeled just a couple days ago, let alone 5-6 days ago. Yes, NC is still getting in on some stuff and perhaps still N SC will get some ice, but is looks nothing like it did on models 48-60 hours ago. NC had to absorb a 200-400 mile jog North to avoid supression - get in the bullseye - and now be on the southern fringe for it to still "work out." Next weekends storm is starting out with us on the fringe - we don't have any room for error or for a northern jog at all and still be in the hunt.

 

Mods, sorry if this conversation should be in banter instead - it just kinda evolved as we all started looking at next weekend.

Link to comment
Share on other sites

Lots of negativity in this thread. Ya'll need to step away from the ledge and enjoy the fact that we have another legitimate threat to follow.

 

In fact, basically all of the major global models agree that North GA gets a solid thump of snow on Friday... That's only 4 and half days away. The latest GFS really hammers them!!!

 

I don't think a trend north is our enemy with this intial leaf of precip being generated... it's just a matter of some precip getting thrown far enough east into our area...

Link to comment
Share on other sites

Lots of negativity in this thread. Ya'll need to step away from the ledge and enjoy the fact that we have another legitimate threat to follow.

In fact, basically all of the major global models agree that North GA gets a solid thump of snow on Friday... That's only 4 and half days away. The latest GFS really hammers them!!!

I don't think a trend north is our enemy with this intial leaf of precip being generated... it's just a matter of some precip getting thrown far enough east into our area...

Man for awhile, we had the finger of precip getting to us at about 8-10 am, then the big jump north 2 days ago! Sad really! What time is the next storm? Friday?
Link to comment
Share on other sites

Man for awhile, we had the finger of precip getting to us at about 8-10 am, then the big jump north 2 days ago! Sad really! What time is the next storm? Friday?

 

Potentially Friday evening.. The ? mark seems to be how far east this leaf of precip gets during that timeframe.  The GFS has it fizzling out in the upstate, but hammers North Georgia with up to 8 inches of snow from it.. GGEM looks very similar but throws the precip farther east into our area. 

Link to comment
Share on other sites

Already went north on 12z GFS

 

 

 

Huh? Most models have that system going North.... Our snow chances lie with the leaf of precip that breaks out on Friday afternoon, not the System winding up in Texas on Sunday.  Though the map you depicted will probably build CAD in and lead to an icing event before that system moves out.

Link to comment
Share on other sites

I'm starting to think we need a seperate PBP thread for the negative nancys to discuss how we aren't going to get any winter weather over the next few weeks....

 

Everyone calm down. Negative biases should be allowed to speak just as the snow hounds do.  Mods, keep this in mind please. :)

Link to comment
Share on other sites

Not too impressed with this "potential" event either.  I don't think it makes us negative nancy like, especially considering how most of us in SC/GA are getting screwed with the current storm.

 

Just took a look at the 12z GFS and once again, looks like a NC storm... UKMET pretty much tries to agree screwing the majority of GA/SC through 144 with the first wave.

 

The longer range storm is ew, the track is already across the interior gulf states.  Strong HP trying to edge in, but ew; you can have that ice up North.

Link to comment
Share on other sites

Not too impressed with this "potential" event either.  I don't think it makes us negative nancy like, especially considering how most of us in SC/GA are getting screwed with the current storm.

 

Just took a look at the 12z GFS and once again, looks like a NC storm... UKMET pretty much tries to agree screwing the majority of GA/SC through 144 with the first wave.

 

The longer range storm is ew, the track is already across the interior gulf states.  Strong HP trying to edge in, but ew; you can have that ice up North.

 

Yeah the UKMET is not enthused from what I can tell, the GGEM though is nasty for GA from 100-108...the problem is the UKMET has been correct on all these events so far beyond 72.  I cannot tell for sure but it does not seem to have from 96-108 over AL/TN/GA what the GFS and GEM have

Link to comment
Share on other sites

Yeah the UKMET is not enthused from what I can tell, the GGEM though is nasty for GA from 100-108...the problem is the UKMET has been correct on all these events so far beyond 72.  I cannot tell for sure but it does not seem to have from 96-108 over AL/TN/GA what the GFS and GEM have

 

Do you have access to precip or RH panels for the Ukmet? It's hard for me to tell if it's generating any precip based off the 500mb and surface pressure maps.

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...