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Jan 22-23 East Coast Storm Discussion


Wow

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Also, if I was a betting man, I would almost guess that most areas will do better on the EPS graphs.

Did a little worse in the snow-boarder counties on the Op... :yikes: But some areas did 1-3" better, it's just random. GSO with 6" , RDU 2.4", HKY 8", Roxboro 6", CLT 2.4", Winston 8"

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06z GFS is unremarkable...however there are a couple of big dogs for Central NC on the 00z GEFS.

 

e2, e9, e12, e14, e15, e16

 

so roughly 25% of the members. Going back to 00z GEFS yesterday, there was maybe one big dog for Central NC...trending well but we may be running out of time. Today is HUGE.

 

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From GSP:

 

 

&&

.LONG TERM /FRIDAY THROUGH MONDAY/...

-- Changed Discussion --
AS OF 350 AM TUESDAY...A VERY ACTIVE AND COMPLICATED EXTENDED
PERIOD. ON FRIDAY...LATEST NAM AND GFS RUNS INDICATED A LOW TRACK ON
THE NORTH SIDE OF MODEL SOLUTIONS. THE ECMWF AND CANADIAN SHOW A LOW
TRACK ON THE SOUTH END...SLIDING ACROSS THE SAVANNAH RIVER VALLEY. I
WILL USE A BLEND OF THE MODEL SOLUTIONS FOR THE DETAILS OF THE
EXTENDED.

USING THIS APPROACH...CONFIDENCE IS HIGH THAT WIDESPREAD PRECIP WILL
DEVELOP ACROSS THE FORECAST AREA LATE THURSDAY NIGHT THROUGH
FRIDAY...I WILL FORECAST POPS NEAR 100 PERCENT. TEMPERATURES EARLY
FRIDAY MORNING SHOULD RANGE FROM AROUND FREEZING ACROSS THE NRN MTNS
AND ADJACENT FOOTHILLS...TO MID TO UPPER 30S ACROSS THE REST OF THE
FORECAST AREA. FORECAST SOUNDING INDICATE THE MOST AREAS WILL SEE A
COLD RAIN THURSDAY NIGHT. HOWEVER...THERMAL PROFILES DO SUPPORT SNOW
MIXED WITH SLEET ACROSS EAST FACING SLOPES OF THE NRN MTNS AND EAST
ACROSS THE UNIFOUR AREA OF NC. AFTER SUNRISE...A WARM NOSE DEVELOPS
OVER THE NC FOOTHILLS...CHANGING PRECIP OVER THE FZRA. THE AREA OF
FZRA SHOULD ERODE THROUGH THE DAY...BUT UPSLOPE FLOW WILL RESULT IN
DYNAMIC COOLING AND MAY PRESERVE FZRA ACROSS THE UPSLOPE AREAS.

FRIDAY NIGHT...THE CENTER OF THE SFC LOW WILL LIFT TO THE NE AS THE
MID LEVEL LOW SLIDES ACROSS THE SOUTHERN APPALACHIANS. DEEP
MOISTURE...CAA...AND NW WINDS WILL MAINTAIN PRECIP ACROSS THE NC
MTNS ALL NIGHT. IN FACT...THE SLOW PASSAGE OF THE MID LEVEL LOW MAY
KEEP PRECIP OVER MOST OF THE CWA WELL INTO THE NIGHT. P-TYPE WILL
GRADUALLY CHANGE OVER TO SNOW FROM WEST TO EAST. NWFS WILL
CONTINUE THROUGH SATURDAY ENDING DURING THE EVENING. THIS FORECAST
PACKAGE WILL FEATURE A SIGNIFICANT INCREASE IN THE MENTION OF FZRA
ACROSS THE NRN MTNS AND NRN FOOTHILLS...WITH WARNING CRITERIA ICE
OVER AVERY AND MITCHELL COUNTIES. SNOWFALL AMOUNTS ARE STILL
EXPECTED TO BE HIGH ACROSS THE NRN MTNS...MODERATE OVER THE REST OF
THE TN BORDER COUNTIES. IN ADDITION...SAT MORNING TEMPS SHOULD FALL
BELOW FREEZING ACROSS THE NC MTNS AND FOOTHILLS...RESULTING IN SLICK
ROADS. THESE HAZARDS WILL BE ADDRESSED IN THE HWO.


DRY AND SEASONABLE CONDITIONS EXPECTED SUNDAY AND SUNDAY NIGHT.
MOISTURE ASSOCIATED WITH ANOTHER SOUTHERN STREAM SYSTEM WILL BEGIN
TO INCREASE OVER THE FORECAST AREA ON MONDAY. GUIDANCE HAS TRENDED A
BIT SLOWER...I WILL DECREASE POPS FOR MONDAY.
-- End Changed Discussion --


&&
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The 06z GEFS ticked colder, especially at the surface. First GEFS run I've seen that supports an ice storm for the NC CAD regions.

Maybe baby steps torwards the Euro!? I guess it's still Euro and CMC vs GFS!? Today's runs should be interesting, hopefully the S shift can continue. Shortwave should be onshore today, that should help the models, for better or worse!
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The 06z GEFS ticked colder, especially at the surface. First GEFS run I've seen that supports an ice storm for the NC CAD regions.

Even the 6z GFS is now showing ice into NC (at least for the onset).

 

We may actually see small shifts to a colder surface (more CAD) than a huge shift in the storm track, as we get closer to the event.  

 

http://mag.ncep.noaa.gov/Image.php?image=data%2Fgfs%2F06%2Fgfs_namer_078_dom_precip_type.gif&model=gfs&area=namer&storm=&cycle=06&param=dom_precip_type&fhr=078&group=Model+Guidance&imageSize=M&ps=model&use_mins=no&preselected_formatted_cycle_date=20160119+06+UTC&scrollx=0&scrolly=0

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Let's say this was to verify. Any chance of a warm nose?

 

It's still showing a low transfer.. so yes. There is no doubt there will be lots of ice for some areas. I'm really starting to think Upstate SC and NE Georgia will see a significant ice storm. (assuming the Euro/ukmet/cmc/navgem are correct)

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It's still showing a low transfer.. so yes. There is no doubt there will be lots of ice for some areas. I'm really starting to think Upstate SC and NE Georgia will see a significant ice storm. (assuming the Euro/ukmet/cmc/navgem or correct)

Oh goodie. :axe: I'd rather have rain than ZR but that's just me personally.

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Sorry, I just don't buy the EURO with the big Southeastward jump. Looks really odd and I don;t ever remember seeing one do that before but then again neither do I think the GFS is correct with the low coming straight through the mountains. I think most of us are going to get a huge mixed bag (outside the mtns) with a nasty ice storm in some areas. Todays runs will allow us to zero in on amounts and track

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It's still showing a low transfer.. so yes. There is no doubt there will be lots of ice for some areas. I'm really starting to think Upstate SC and NE Georgia will see a significant ice storm. (assuming the Euro/ukmet/cmc/navgem are correct)

If the models you listed win out, I do think most CAD areas will be in play for at least ice. We're seeing colder surface depictions on all the models with each passing run. But, if the GFS wins the battle, it's going to be hard for many of us to not see at least some rain; even with it showing colder surface temps with each passing run.

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we all want the Euro solution. I get destroyed on that one and you guys do well too. we all win. watch this be the only time its not on point.

the only time? The euro has been wrong many times over the last 5 years. It's not the same model that would nail storms like it did before 2011.
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