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February Mid/long Range Winter Discussion


TARHEELPROGRAMMER

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Interesting that the Euro Control is an apps runner, but it keeps CAD regions of GA/SC below freezing for all of the precip, which is widespread 1 to 2 inches of liquid. The Freezing line runs from just south of Charlotte to the northeastern burbs of Atlanta as of 1am Tuesday when most of the precip has already moved through.

 

Why don't you fire up a storm thread for this one before the 0z runs tonight?

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APPREGE, "The weenies #1 choice for weather porn"

 

 

Seriously though, I don't think it's done that bad in the few storms I've followed. If anything, i feel like it's been  slightly too amped up in longer ranges.

 

The image above looks really good.  At 114, the high is in a great spot with precip not too far away.

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APPREGE, "The weenies #1 choice for weather porn"

Seriously though, I don't think it's done that bad in the few storms I've followed. If anything, i feel like it's been slightly too amped up in longer ranges.

hopefully the Euro para comes in with a middle of the rd solution between the Euro op and Gfs.
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It's cold with precipitation breaking out by 114.  That model let me down, it took until the day of the last event to finally let go of the precip getting into my area.  In theory extrapolated, it would be a Winter storm even South of CAE.

 

I think it did very well at 3 and 4 day leads with the coastal bomb compared to other models.

 

The precip placement was off, but the 5h and surface reflections matched up pretty well with what happened.

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From RAH...

 

MON THROUGH WED: MODEL DIFFERENCES WIDEN HEADING INTO MON AS ANOTHER
ROUND OF ENERGY SHIFTS INTO THE PLAINS BEFORE AMPLIFYING OVER THE
ERN STATES BY MID WEEK. IN SHORT... THE ECMWF SOLUTION (AND THE
CANADIAN IS SIMILAR) WAS PREFERRED OVER THE GFS... WITH THE FORMER
APPEARING MORE REASONABLE AND FITTING BETTER WITH CLIMATOLOGY.
ACCORDING TO THIS SOLUTION... A POTENT PERTURBATION WILL SWING
THROUGH OK MON THEN DEEPEN OVER THE LOWER MISS VALLEY MON NIGHT
BEFORE CROSSING THE TN VALLEY/SE/CAROLINAS/MIDATLANTIC TUE INTO WED.
THE ECMWF BRINGS STRONG MOISTURE ADVECTION AND DEEP LIFT STARTING
MON AND CONTINUING THROUGH TUE NIGHT... FINALLY SHIFTING TO OUR NE
WED... ALL THE WHILE TAKING A MILLER-B TYPE CYCLOGENESIS PATTERN
THROUGH THE REGION. THERE REMAINS A GREAT DEAL OF UNCERTAINTY
REGARDING THE VERTICAL THERMAL STRUCTURE AS WELL AS QPF... BUT
CONFIDENCE IN AT LEAST SOME PRECIP MON THROUGH TUE NIGHT IS HIGH
ENOUGH TO BUMP UP POPS INTO THE LIKELY CATEGORY. AND IF THE ECMWF IS
CORRECT... WE'D BE LOOKING AT A VERY WET EVENT... WITH A CHANCE OF
MOSTLY SNOW MON TRENDING UP TO MOSTLY RAIN MON NIGHT AS POPS
INCREASE... INDICATING A LOWER OVERALL IMPACT FROM WINTRY WEATHER.

BUT A LOT CAN CHANGE OVER THE NEXT SEVERAL MODEL RUNS... SO EVERYONE
SHOULD KEEP A CLOSE EYE ON THE LATEST FORECASTS. TEMPS SHOULD START
TO WARM UP INTO THE 30S MON... INTO THE 40S TUE AS WE GET INTO THE
WARM SECTOR... AND PERHAPS LOW 50S (CLOSE TO NORMAL) WED AS THE MID
LEVEL LOW MOVES NE AWAY FROM OUR AREA. -GIH

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JB's afternoon thoughts on the system!

 

 

3 storms are going to be used to analog the snow amounts next week March 2-4 1994, Feb 13-15 1984, Dec 26-27 2012. One of the them was a huge rainstorm all the way back here and yes I see the euro but it looks like its developing the upper low too far south and by doing so, has too much ridge in front. I like the storm to the Ohio valley, the reforming over Ga and coming up the coast just inland. Obviously in the big cities that is snow to rain. But the euro makes little sense for instance as the upper low track in winter is a classic areas just west of the track but it has rain all the way back to Cleveland at one time with this. In addition the model warms for instance, State College from 24 to 40 degrees while preciping in 6-12 hours on a southeast wind. So while possible, I dont think its plausible.

I will play with test numbers a bit later

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From HPC Model Analysis...they are not buying the UKMet....will they go down with the ship??  :snorkle:

19Z UPDATE: NOT MUCH CHANGE SEEN IN THE 12Z GUIDANCE. THE UKMETREMAINED VERY CONSISTENT WITH ITS PREVIOUS RUN AND WILL REMAINOUTSIDE OUR PREFERRED PREFERENCE FOR NOW. THE 12Z GEM IS ALSOPRETTY SIMILAR TO ITS OLD RUN. THE 12Z ECMWF TRENDED A BIT SLOWERAND IS CLOSER TO ITS 12Z RUN FROM YESTERDAY. STILL GOING WITH APREFERENCE SOMEWHERE BETWEEN THE 12Z NAM/GFS/GEM/ECMWFSOLUTIONS...WITH ONLY THE UKMET CONTINUING TO APPEAR OUTSIDE THEBEST CLUSTERING.
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Well, if you look strictly at hour 96.. the ukmet is way out on an island. No other global model shows the shortwave in the pacific diving down into Colorado like it does.

 

The Euro looks similar to the GFS/CMC at 96hrs, it's differences show up after this point when additional pacific energy is diving into the backside of broad-based trough.

 

 

For this reason, I think we can basically toss the Ukmet.

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Interesting that the Euro Control is an apps runner, but it keeps CAD regions of GA/SC below freezing for all of the precip, which is widespread 1 to 2 inches of liquid. The Freezing line runs from just south of Charlotte to the northeastern burbs of Atlanta as of 1am Tuesday when most of the precip has already moved through.

I'm afraid this may end up being a major ICE Storm for us. We need to hope for a southern track to pull those 850s down some more.

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Even if it starts as snow on Monday...the snow will immediately stick to anything, including roads. Minor precip could still be a big impact.

Yeah, the temps before being so cold, I won't have to start precip at 50 degrees and wait on the wedge to build in, like the Jan event! Even a small amount of QPF and these temps, will turn roads to instant parking lots, especially , if it starts around midnight or early AM!
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Let's review what is likely to happen per climo:

 

1. There will be some ice/frozen precip for most North of Atl

2. Precip amounts will be over done

3. CAD will NOT leave as quickly as modeled

4. Areas in the Western Piedmont and mtns will stay frozen longest

5. System will come further West than modeled

6. There WILL be a warm nose everywhere and for a substantial period of time

7. Track will not be clear until Sat night of Sunday morning

8. Some of us WILL lose power due to ice bringing down trees and power lines

9. It will rain over Brick's house

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Let's review what is likely to happen per climo:

 

1. There will be some ice/frozen precip for most North of Atl

2. Precip amounts will be over done

3. CAD will NOT leave as quickly as modeled

4. Areas in the Western Piedmont and mtns will stay frozen longest

5. System will come further West than modeled

6. There WILL be a warm nose everywhere and for a substantial period of time

7. Track will not be clear until Sat night of Sunday morning

8. Some of us WILL lose power due to ice bringing down trees and power lines

9. It will rain over Brick's house

 

Agree on all counts, especially #4. - and #9 of course.

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DDT!!! 

 

 
Wxrisk.com added 2 new photos.
1 hr · 

UPDATE ON FEB 16 EAST COAST WINTER STORM " THREAT"

Our initial assessment from yesterday with regard to the February 16 East coast winter storm appears to be holding. The data is pretty strong that this is not going to be a "pure" or all snow storm event for the big cities of the East Coast-- from Raleigh and Richmond to New York City New Haven Province and Boston. Inland however especially close to interstate 81 - see IMAGE #1 - the precipitation is likely to stay mos...

See More
 
12654282_983970404983551_346024272196538
12734095_983971344983457_701242363963936
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