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January 2019 General Discussion & Observations


Rtd208

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Not let up in sight for the warmest temperature departures focusing over the Dakotas since December 1st. Williston, ND is close to challenging 2012 for the warmest start to winter on record.

1 2012-01-07 25.9 0
2 2019-01-07 24.5 0
3 1955-01-07 24.3 0
4 1960-01-07 24.0 0
5 1931-01-07 23.9 0

 

28789737-6011-4EB3-8B08-5174F401ACBF.thumb.png.6707019545a695220456f9dbf397e0da.png

A1A21AE3-EACE-483E-8681-B818468467AF.thumb.png.90a03bf7608becb8f00b3cbab3f5b31d.png

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Just now, bluewave said:

Not let up in sight for the warmest temperature departures focusing over the Dakotas since December 1st. Williston, ND is close to challenging 2012 for the warmest start to winter on record.

1 2012-01-07 25.9 0
2 2019-01-07 24.5 0
3 1955-01-07 24.3 0
4 1960-01-07 24.0 0
5 1931-01-07 23.9 0

 

28789737-6011-4EB3-8B08-5174F401ACBF.thumb.png.6707019545a695220456f9dbf397e0da.png

A1A21AE3-EACE-483E-8681-B818468467AF.thumb.png.90a03bf7608becb8f00b3cbab3f5b31d.png

 

Its been a typical El Niño up there or I guess atypical in terms of how big the departures are.  I believe even in 02-03 places like ND/SD torched most of the winter 

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12 minutes ago, SnowGoose69 said:

 

Its been a typical El Niño up there or I guess atypical in terms of how big the departures are.  I believe even in 02-03 places like ND/SD torched most of the winter 

They had 2 top 5 warmest winters decade. But that is the prime location for the El Niño ridge to set up. It’s just been on the extreme side so far this winter akin to the WAR in 2018.

1 1931-02-28 26.4 0
2 1992-02-29 24.6 0
3 1987-02-28 23.8 0
4 2016-02-29 22.4 0
5 2012-02-29 22.1 0
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12 minutes ago, mikem81 said:

NAM at 84 (FWIW) has snow approaching Chicago

It's consistently been in the GFS camp, albeit at the extreme end of its run.

Interestingly, the NAM also appears to be much faster with the digging shortwave over Ontario; the most recent GFS runs have had it diving south on Sunday, but the NAM is bringing it down on Saturday.

gfs_z500_vort_us_20.png

vs

namconus_z500_vort_us_53.png

I'm not sure what that would mean for the storm though, and again this is the long range NAM.

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18Z GFS looks slightly better than 12Z, i.e., a bit more expansive snow shield up to the Philly-NYC corridor (1-3" roughly), but the heavier snows (6" or so) remain across VA and into the DelMarVa and clipping far SE NJ.  But not a "major" storm as other models have shown, presumably due to less phasing.  

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1 minute ago, RU848789 said:

18Z GFS looks slightly better than 12Z, i.e., a bit more expansive snow shield up to the Philly-NYC corridor (1-3" roughly), but the heavier snows (6" or so) remain across VA and into the DelMarVa and clipping far SE NJ.  But not a "major" storm as other models have shown, presumably due to less phasing.  

Yeah, the storm comes further north but the faster vort means less phasing and a weaker storm.

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Contributing the interest through the 12z/8 ensembles.  I've noticed the EPS and GEPS 24 hr qpf edging north (GEFS further N than the .10 EPS). Does this continue or recede with cold dry air on the north fringe a problem?  Also the EPS and GEFS in particular are taking the positive tilt southern stream and intensifying into a nearly neutral n-s position crossing the mid Atlc coast the 14th. On the GEFS, several members differ sharper slower than the 12z GFS op.  UK has shifted south but at least the EC op through 12z/8 is steady with a period of S- to just n of I80 on the 13th.  JMA is possibly too sharp and north but worthy of the most impressive course look.  Long ways to go...but the way i see it.  Trough in the east... almost everything  the last 6 months or so seems to sharpen to the coast and tends to shift qpf a little northward toward T0.   Confluence zone latitude between the north and southern 500MB stream will determine ultimately and i think we'll see that edge a little north.  Long long ways to go for the short wave interactions ultimately determine the flow interactions.  btw... its raining pretty good here this evening in Wantage. 36F, down from our max of 39.  had .02 freezing pcpn early this morning and .15 since about 3PM.  We're heading for a storm total between 1AM this morning and 7am Wednesday of 1/4-1/2".  

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56 minutes ago, Gravity Wave said:

Looks like .5" of QPF for the area. Good sign considering the ensembles are usually too dry this far out.

The lower resolution of the ensembles can underestimate HP influence to the north though. The NAM under 48 hrs and the Euro usually do better with such strong HP to the north.

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19 minutes ago, bluewave said:

The lower resolution of the ensembles can underestimate confluence to the north though. The NAM under 48 hrs and the Euro usually do better with such strong HP to the north.

There are a few gefs members which shows rain for the coast lol

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The SOI was +0.15 today. It had been negative for 8 consecutive days. The last time the SOI was negative for 8 or more consecutive days was September 18 through October 3, 2018, a stretch of 16 consecutive days. The SOI should return to negative values in coming days.

The AO was -0.306. This is the third consecutive day the AO was negative.

On January 7, the MJO moved into Phase 8 with an amplitude of 2.405 (RMM). That amplitude was somewhat lower than the January 6-adjusted figure of 2.518. The MJO's progression has accelerated in recent days. However, both the dynamical and statistical guidance suggests that the MJO's progression will likely slow as it moves through Phase 8.

Beyond Phase 8, the MJO forecast remains somewhat uncertain. Based on a blend of the guidance, the baseline scenario is that the MJO would gradually move through Phase 8 at a high but lowering amplitude. It would then move into Phase 1. As that happens, the AO could have some positive fluctuations before it returns to mainly negative values. The development of a sustained pattern change to colder weather remains unchanged.

The risk of a moderate (4" or more) or significant (6" or more) snowfall is increasing. Based on the forecast teleconnections, the January 10-24 period will see an above to much above average statistical probability of measurable snow. The probability of a moderate snowstorm during the MJO's Phase 8 and a PNA+/AO- combination is approximately twice as high as climatology.

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I have been laying low since I have a broken collar bone from ice boarding but I think we are solid for a light snow event. There is nothing screaming big storm but we have seen allot more moisture in past storms then modeled. I like a general 2-3” across the area. Anything is better then nothing at this point. 

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19 minutes ago, LongBeachSurfFreak said:

I have been laying low since I have a broken collar bone from ice boarding but I think we are solid for a light snow event. There is nothing screaming big storm but we have seen allot more moisture in past storms then modeled. I like a general 2-3” across the area. Anything is better then nothing at this point. 

Sorry to hear that. Get well soon.

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