OT: Tracking Winter Storm Fern 1/25-26

bac2therac

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Jul 30, 2001
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early calls are starting

 
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bac2therac

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I think that’s a little conservative but I guess better to start low and go higher
for the coast it looks conservative as G might feel that mixing or changeover takes place.....certainly there is support but for elsewhere its in line..some can quibble and say 8-12..for central jersey into suburbs of nyc instead of 6-10 but its a first call, I think 6-12 would satisfy all and maybe put the coast 4-8
 

bac2therac

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well that 4-6 inches would have sleet and ice too on top of that and you still may get 8-10 inches which is hardly a disappointment

i think the hype 7-10 days out is always unwarranted, this is still close to giving everyone a foot but modelling 7 days outs is never going to be accurate and even 3 days out we still havent pinned the details out
 

bac2therac

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Shoujd be colder than 10:1 ratio - here is the kuchera map which factors in ratio


We have no ideas ratios yet..its best to go with 10-1 until we figure out how much of the warm nose infiltrates. Near the changeover mixing will cancel out the early high ratios
 
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Sweet Pea's Corner

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Sep 10, 2001
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Had an issue with my snowblower that we leave at a customers house. He is a corner lot with sidewalks that have to get done. Cord pulled out so we use the electric start on it. Just plug in outside outlet and we are good to go.
 

Mikemarc

Heisman
Nov 28, 2005
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We have no ideas ratios yet..its best to go with 10-1 until we figure out how much of the warm. Near the changeover mixing will cancel out the early high ratios

agree about not knowing what ratios it will be…Which is why I think kuchera should be what we’re using since it factors in temperature to estimate the likely ratio.

But all good - just goes to show how unpredictable this storm will be and range of outcomes possible
 

RUforester72

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Jul 23, 2014
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Gotta admit to being a bit jealous Here in Bend (OR) we're on our sixth day of freezing fog, which actually deposited a very thin layer of light snow/frost that could be shoveled. Ski areas are one the verge of closing. Guess I should enjoy it but I cannot. What supplies have you stocked up on for the big storm?
 
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Knight Shift

Heisman
May 19, 2011
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Gotta admit to being a bit jealous Here in Bend (OR) we're on our sixth day of freezing fog, which actually deposited a very thin layer of light snow/frost that could be shoveled. Ski areas are one the verge of closing. Guess I should enjoy it but I cannot. What supplies have you stocked up on for the big storm?
There are only 3 things on everyone's list.

 

Mikemarc

Heisman
Nov 28, 2005
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Mt Holly NWS has a foot or more forecasted for everywhere in NJ.




NY NWS a bit more conservative


 

bac2therac

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Mt holly is going to stick with NBM til they fall of a cliff

and their amounts do not even line up with Upton

EDIT the Upton Map goes until 7pm sunday so not complete but at that time the mixing issues are already happening according to most models

they definitely are hugging the gfs
 
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Mikemarc

Heisman
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Yup it sure does. Here is the total upton map which is much more in tune with My holly. My fault about that!

 

Mikemarc

Heisman
Nov 28, 2005
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Mt holly is going to stick with NBM til they fall of a cliff

and their amounts do not even line up with Upton

EDIT the Upton Map goes until 7pm sunday so not complete but at that time the mixing issues are already happening according to most models

they definitely are hugging the gfs

they also love the Blend of models which continues to increase totals.
 

Mikemarc

Heisman
Nov 28, 2005
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thats the same thing..nbm which i dont see how its actually increasing totals given the modelling
There’s models in the blend I’ve never even heard of and aren’t shared - so I’d assume those are showing more aggressive totals as well
 

bac2therac

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There’s models in the blend I’ve never even heard of and aren’t shared - so I’d assume those are showing more aggressive totals as well
no

all these are available...

What goes into the NBM (Inputs)?​

Global Models

  • ECMWF (Euro)
  • GFS
  • CMC (GGEM)
  • UKMET
  • ICON (limited elements)

Ensembles

  • EPS
  • GEFS
  • GEPS
  • HREF (short range)

Regional / Mesoscale

  • HRRR
  • NAM / NAM-Nest
  • RAP
  • RGEM

Observations & Post-Processing

  • Surface observations
  • Climatology
  • MOS-style bias correction
  • Downscaling to fine grids (~2.5 km)
 

Mikemarc

Heisman
Nov 28, 2005
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no

all these are available...

What goes into the NBM (Inputs)?​

Global Models

  • ECMWF (Euro)
  • GFS
  • CMC (GGEM)
  • UKMET
  • ICON (limited elements)

Ensembles

  • EPS
  • GEFS
  • GEPS
  • HREF (short range)

Regional / Mesoscale

  • HRRR
  • NAM / NAM-Nest
  • RAP
  • RGEM

Observations & Post-Processing

  • Surface observations
  • Climatology
  • MOS-style bias correction
  • Downscaling to fine grids (~2.5 km)


There are many more than you listed. And some you listed (UKIE) aren’t used.
 

Mikemarc

Heisman
Nov 28, 2005
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It was taken from a respected poster on the americanwx board so

all good but my list is taken directly from the agency that uses the model.

the model seems to get new inputs often so I’d assume that poster hasn’t seen the updated list
 

MadRU

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Jul 26, 2001
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Max Velocity shows a slight move to the south for the ice line in the latest run

 

bac2therac

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18z nam was colder... storms comes in earlier..the mix gets to central jersey eventually but at taile end after we thump. These amounts are a decent bounce up from their earlier run. Remember the Nam is still a bit out of its range at this time. It does look like the warming trend on models has at least stopped or is slowing retreating

10-1 ratios, would be slightly higher depending on ratio. 6-12 and less in southern coastal nj

 

Retired711

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Nov 20, 2001
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At 3 p.m., the NWS in Mount Holly issued a new briefing. They are saying that "widespread total snow amounts ranging from 8-18 inches [are] likely." The lower amounts will be "farther south and closer to the coast, where more wintry mix is likely." The forecast otherwise is for 12-18 inches. "A light glaze to 0.10” of ice is possible,
especially near and southeast of I-95." There is a cold weather advisory for Friday night into Saturday morning, with "dangerously cold wind chills between -10° and 0°" and wind chills as low as -20° in the southern Poconos. In addition, "a prolonged period of well below normal temperatures is expected to continue through next week, with
wind chills in the single digits to below zero at night each night."

https://www.weather.gov/media/phi/current_briefing.pdf
 

bac2therac

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just saw Lees map...much of NJ north of 95 is 6-12...its northwest NJ and morris etc 12 plus also says mixing will cut totals toward monmouth, ocean and coast to south jersey
 
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bac2therac

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18z rgem is 6-10 with sleet issues by 4pm and with light mix snizzle after 8pm and overnight
 

Knight Shift

Heisman
May 19, 2011
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just saw Lees map...much of NJ north of 95 is 6-12...its northwest NJ and morris etc 12 plus also says mixing will cut totals toward monmouth, ocean and coast to south jersey


 
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