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The Official 2014 Fall Discussion Thread


jburns

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We need this to come farther east though. Areas east of the mountains get left out of it. Looks like a long stretch of 80+ days in our area with summertime humidity too by next week.

 

Yep, gonna be an awesome few days!  Get out and enjoy the sunshine and warm weather before the harsh chill of winter sets in.

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A doozie of an ULL is forecasted to cut off just west of the Mississippi River this weekend, then meander east and quickly take off NE by Wednesday. Could be very stormy for parts of the SE.

ecmwf_z500a_sd_eus_9.png

850mb winds on the east side of that upper low running in excess of 50 knots...that would be a great severe weather and moisture transport mechanism per the Euro

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850mb winds on the east side of that upper low running in excess of 50 knots...that would be a great severe weather and moisture transport mechanism per the Euro

Not to mention, it's showing a 995 mbar surface low in SE Missouri. That usually spells organized severe threat for the SE.
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Not to mention, it's showing a 995 mbar surface low in SE Missouri. That usually spells organized severe threat for the SE.

 

Yeah that southerly Gulf surface flow meeting an airmass this cold could bring a decent severe threat.  Thickness values behind the cold front are similar to what came across the area over the weekend.  The question now is whether or not it tracks through the Ohio Valley or along the coast.  Ohio valley looks more probable atm imo.  Should be a better severe threat if the low tracks that way.

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12z Euro has a low during the middle of next week taking a panhandle hook type track moving the low from TX on Tuesday morning to Wisconsin on Wednesday afternoon.  Also shows a very strong vort max moving across AR & MS Tuesday night into Wednesday morning.  Showing 60kt+ winds at the 700mb level over AR & MS on Tuesday afternoon from the south and 200mb winds veering a bit.  This is beginning to look like a very interesting setup if it verifies. 

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Thankfully, none of the latest guidance has a big storm.  Also, there's nothing too concerning about wiping away the negative anomaly around the Aleutians either.  The OPI is looking good so far.  Don Sutherland's post on the main board offers some good perspective about -AO Octobers following -AO summers leading to -AO winters. :)

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IIRC there have been two large October storms in the last 8 years that dropped very early season snow just to our north and northeast.  Sandy was one of them.  BOTH of those winters were pretty bad for most of the east.

 

It would be cool if Larry could dig up the years that had big storms/nor'easters in October and correlate that with the warmer and less snowier following winters.

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12z Euro coming in farther south with the cut off low.  It actually centers it over Tennessee next Wednesday morning. It appears to go negative tilt just a bit in the 168hr frame.  This storm has my attention for sure.

 

 

ETA: At hour 192 moves the cut off low over WNC, high to the northeast is being modeled much stronger so its forcing the low farther south.

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12z Euro coming in farther south with the cut off low.  It actually centers it over Tennessee next Wednesday morning. It appears to go negative tilt just a bit in the 168hr frame.  This storm has my attention for sure.

If that is close to right our dry spell will be over in a big way. Hopefully it is, since we haven't had decent rain here since August.

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Here are the 4 main operational LR models from eWall.  The Euro is the slowest/deepest.

 

12z Euro @ 168:

 

post-987-0-79809100-1412794247_thumb.gif

 

12z Navy @ 168 (similar in timing to the Euro):

 

post-987-0-31284500-1412794283_thumb.gif

 

12z GFS @ 150 (faster and weaker than the Euro):

 

post-987-0-68016200-1412794310_thumb.gif

 

12z CMC @ 150 (similar in timing and strength to the GFS):

 

post-987-0-84811700-1412794342_thumb.gif

 

The GFS has certainly trended toward the Euro with respect to the amplification of the system.  The Euro has trended more south and east with time, while still maintaining it's deeply amplified and cut-off solution.

 

One thing is sure, if the Euro is right, there will be some severe weather and heavy rain in the southern and eastern part of the country.  It will be interesting to see which model is handling the situation best.  It will certainly be fun to follow.

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So, I've noticed the extended here in southeastern VA keeps jumping back and forth from a torch to cool weather for mid october, and it seems to go back and forth like that every day... Which of the models is it that seems to be so hopelessly confused about the pattern mid-month?

 

They're probably going off the GFS.  It changes every 6 hours.

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It would be cool if Larry could dig up the years that had big storms/nor'easters in October and correlate that with the warmer and less snowier following winters.

 

1234,

 Unfortunately, I don't have that info and it isn't readily obtainable. I do recall one right off the top of my head due to personal experience: Oct. of 1982 if I recall correctly. That was during a strong El Nino, which may have indirectly been a contributing factor.

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Here are the Euro 500mb height/850mb temp plots from 168-240.  Very strong cut-off that just meanders slowly east and northeast.  Also notice the Aleutian low comes back around 216.  It would be awesome if this was a couple of days out instead of way down the road.  We'll probably end up with a quick trough that slides in and out.

 

168:

 

post-987-0-51054200-1412797331_thumb.gif

 

192:

 

post-987-0-14394700-1412797347_thumb.gif

 

216:

 

post-987-0-11511700-1412797363_thumb.gif

 

240:

 

post-987-0-92908200-1412797375_thumb.gif

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18z GFS continues the trend to a negative tilt trough or possible cutoff...

6z GFS still shows the trough passage but it does move right out to sea. After that the GFS continues to show Larry's phantom storm at day 12. After that it looks like a warm zonal pattern.

http://mag.ncep.noaa.gov/Image.php?image=data%2Fgfs%2F06%2Fgfs_namer_144_500_vort_ht.gif&model=gfs&area=namer&storm=&cycle=06&param=500_vort_ht&fhr=144&group=Model+Guidance&imageSize=M&ps=model&use_mins=no&preselected_formatted_cycle_date=20141009+06+UTC&scrollx=0&scrolly=0

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