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January 15th-17th 2024 Arctic Blast/Snow Event


John1122
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2 minutes ago, John1122 said:

The NAM was likely heading this way still, it was just slow rolling and the snow had only arrived in the East as the run ended. 

The SREF mean looks fine too for where it's at.  Seems to be in agreement with RGEM and ICON.

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Winter Storm Watch

URGENT - WINTER WEATHER MESSAGE
National Weather Service Memphis TN
254 PM CST Fri Jan 12 2024

ARZ009-018-026>028-035-036-048-049-058-MOZ113-115-MSZ001>017-
020>024-TNZ001>004-019>022-048>055-088>092-130500-
/O.NEW.KMEG.WS.A.0001.240114T1800Z-240116T1200Z/
Clay-Greene-Craighead-Poinsett-Mississippi-Cross-Crittenden-
St. Francis-Lee AR-Phillips-Dunklin-Pemiscot-DeSoto-Marshall-
Benton MS-Tippah-Alcorn-Tishomingo-Tunica-Tate-Prentiss-Coahoma-
Quitman-Panola-Lafayette-Union-Pontotoc-Lee MS-Itawamba-
Tallahatchie-Yalobusha-Calhoun-Chickasaw-Monroe-Lake-Obion-
Weakley-Henry-Dyer-Gibson-Carroll-Benton TN-Lauderdale-Tipton-
Haywood-Crockett-Madison-Chester-Henderson-Decatur-Shelby-Fayette-
Hardeman-McNairy-Hardin-
Including the cities of Piggott, Corning, Paragould, Jonesboro,
Harrisburg, Blytheville, Wynne, West Memphis, Forrest City,
Marianna, Helena-West Helena, Kennett, Caruthersville, Southaven,
Olive Branch, Holly Springs, Ashland, Ripley MS, Corinth, Iuka,
Tunica, Senatobia, Booneville, Clarksdale, Marks, Batesville,
Oxford, New Albany, Pontotoc, Tupelo, Fulton, Charleston,
Water Valley, Coffeeville, Bruce, Calhoun City, Houston, Okolona,
Amory, Aberdeen, Tiptonville, Union City, Martin, Dresden, Paris,
Dyersburg, Humboldt, Milan, Huntingdon, Camden, Ripley TN,
Covington, Brownsville, Alamo, Jackson, Henderson, Lexington,
Parsons, Decaturville, Bartlett, Germantown, Collierville,
Memphis, Millington, Somerville, Oakland, Bolivar, Selmer,
and Savannah
254 PM CST Fri Jan 12 2024

...WINTER STORM WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH
LATE MONDAY NIGHT...

* WHAT...Heavy snow possible. Total snow accumulations of 3 to 8
  inches possible.

* WHERE...Portions of East Arkansas, North Mississippi,
  Southeast Missouri and West Tennessee.

* WHEN...From Sunday afternoon through late Monday night.

* IMPACTS...Travel could be very difficult. The hazardous
  conditions could impact the morning or evening commute.
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.LONG TERM...
(Sunday through next Friday)
Issued at 125 PM CST Fri Jan 12 2024

On Sunday, that upper low over the Great Lakes will reinforce
cold air over our region and only allow for high temps to get into
the 20s and 30s. A weaker trough will allow for a stationary
boundary to linger over the mid state for the start of next week,
allowing for a decent shot at some good snowfall accumulations.
Models continue to waver and dont increase confidence at all with
snow amounts as latest ensembles have shifted the snow axis ~100
miles to the southeast, but, the boundary, isentropic lift, and
other synoptic factors are starting to point to the potential for
the mid state to see accumulating snow.

Ensembles show a few members at higher end amounts, dragging the
mean higher, but there has been a slight uptrend in forecasted
snow amounts since the previous run. We will see what the next
runs have and hopefully show some consistency to increase
confidence on location and magnitude of snow. The GFS/NAM show
decent isentropic lift Sunday night through the day Monday, with
some convergence as well as Q vector convergence hinting at
pockets of banded snow potential during the day Monday. Soundings
show deep saturation in the low levels just a little warmer than
the DGZ, but still enough lift for good snowfall potential. GFS
and its ensemble suite showing the highest potential for snowfall
right now compared to other models, likely due to stronger
synoptic forcing, frontogenesis, and a little more surface
moisture. We will see if that holds. The one thing that has
remained consistent is the cold temperatures, so unlike other snow
events, this event will start and finish as snow across the area,
which will further support accumulating snow.

Temperatures next week are already going to struggle to get above
freezing until Thursday, but any higher snowfall amounts will
result in low temperatures dropping further than forecasted. Right
now, the coldest night will be Tuesday night, having lows in the
single digits and wind chills in the single digits below zero.
Light snow looks to continue Tuesday and may result in some
additional light accumulation, but at the very least, a cloudy day
will prevent the sun from showing up during the day. The sun
should return Wednesday with above freezing high temps Thursday.
Unfortunately another trough will swing in Friday, bringing rain
and snow potential along with colder temps into next weekend.
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4 minutes ago, AMZ8990 said:

I thought the same, but I’m glad to see them put it out ahead of time to give people plenty of advanced notice.  

It's the responsible thing to do.  Gives a nice spread of 3 to 8, acknowledging uncertainty but bracing for the worst.  Waiting until the last minute in order to be the most correct defeats the purpose of the statement.

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Winter Storm Watch SOP allows up to 48 hours out. They're using all of it! 3-8 inches on a Day 3 forecast in the South. Though the Mid South would be the place to forecast it.

Farther east I'm not particularly concerned about the NAM 60-84 hours. That far out the Globals should still offer greater value. I'm always concerned about Chattanooga, but not because of the NAM. :guitar:

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I keep noticing Greene and cocke counties keep getting the short end of the stick on these runs.  Possible downsloping issues or what?  Would certainly be strange for there to be more snow points south and west of us to get several inches and then a sharp cutoff but stranger things have happened 

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10 minutes ago, Dsty2001 said:

I keep noticing Greene and cocke counties keep getting the short end of the stick on these runs.  Possible downsloping issues or what?  Would certainly be strange for there to be more snow points south and west of us to get several inches and then a sharp cutoff but stranger things have happened 

The icon is rain for border counties including your area. The NAM just has no precip for us. And the RGEM also has rain for border counties. 

Too amp'ed. My county is even worse. Unfortunately it's a very likely outcome with every single model showing that. Still some time to move around though.

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I love that this is looking to be a longish duration event.  Not just a quick 3 or 4 hour hit.  My exuberance is growing! 
Yeah if it pans out it'll be the longest duration snowfall for me in many many years. As modeled with 18z GFS, IMBY and Knoxville proper it's just shy of a 24 hour continuous event in totality.

Sent from my Pixel 7 using Tapatalk



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6 minutes ago, tnweathernut said:

It looks like you guys/gals down around Knoxville have a GREAT shot with this one.  Should be fairly widespread.  This track has already been more fun than anything we got a look at last year.  

Maybe we can score on the next system,the Euro would bring a warm nose to us tho with the LP crossing into N/Al.the GFS shows more of a inverted trough down into Cen Al.everyone would benfit from the GFS into Tn

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11 minutes ago, tnweathernut said:

It looks like you guys/gals down around Knoxville have a GREAT shot with this one.  Should be fairly widespread.  This track has already been more fun than anything we got a look at last year.  

The 18z gfs got tri cities pretty good

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8 minutes ago, Dsty2001 said:

The 18z gfs got tri cities pretty good

Yeah, I noticed that.  My downslope city comment was mostly in jest, but it’s always in the back of my mind.  It’s been showing on models on and off all day.  The two things we do extremely well up here are dryslots and downslope.

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I always enjoyed probability and statistics in college, even though I was horrible with numbers.  If they think there is a 40% chance of 3 or more inches, would they also accept a 5000$ bet to pay out equivalent odds that it does snow over 3 inches?

 

Screenshot_20240112_181323.jpg

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