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January 3 CAPE Storm


WxUSAF
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3 minutes ago, IUsedToHateCold said:

Euro doesn't quite have what the GFS did, but these totals seem more sensical to me. GFS really does score a coup it seems. 

GFS has more than every other model. I really think this will probably be a 6-10" event with not many 10+ totals.

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Here's a quick visual comparing the 0z Euro to the 0z EPS. It's hard to tell since it's overlayed on top of the EPS, but the big L represents the operational. A fair bit of lps NW of the mean, and of course there's the cluster well offshore, but that scenario seems to be dwindling with every model cycle. 

ecmwf-ensemble-avg-ma-mslp_with_low_locs-1232800.thumb.png.237fa6248302267a35e58d310a67d633.png

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the NAM made a huge shift at 500mb, namely in the positive interaction of the NS rather than a negative confluent push, as we had seen a couple of days ago

the initial vort is more amped, which is great, but the NS is now helping to turn heights in a more southerly direction. look at the wind bards S of LI: almost due S from WSW last run. this drastically changes the angle of the PVA

namconus_z500_vort_us_fh36_trend.thumb.gif.2570e9c7e88d5d29a0f9763b7f3429a8.gif

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From AKQ

URGENT - WINTER WEATHER MESSAGE
National Weather Service Wakefield VA
352 AM EST Sun Jan 2 2022

VAZ048-060>062-064-067>069-509>511-513-515-021700-
/O.NEW.KAKQ.WS.A.0001.220103T0800Z-220103T1800Z/
Fluvanna-Prince Edward-Cumberland-Goochland-Caroline-Nottoway-
Amelia-Powhatan-Western Louisa-Eastern Louisa-Western Hanover-
Western Chesterfield-
Western Henrico (Including the City of Richmond)-
Including the cities of Bybee, Central Plains, Cunningham,
Lake Monticello, Nahor, Palmyra, Troy, Farmville, Angola,
Guinea Mills, Hawk, Raines Tavern, Reeds, Stoddert, Goochland,
Corbin, Burruss Corner, Cedar Fork, Dawn, Crewe, Earls, Mannboro,
Scotts Fork, Amelia Courthouse, Chula, Denaro, Jetersville,
Fine Creek Mills, Flat Rock, Goodwins Store, Subletts, Worshams,
Clayville, Genito, Louisa, Mineral, Ashland, Bon Air, Midlothian,
and Richmond
352 AM EST Sun Jan 2 2022

...WINTER STORM WATCH IN EFFECT FROM LATE TONIGHT THROUGH MONDAY
AFTERNOON...

* WHAT...Heavy wet snow possible. Total snow accumulations of 2
  to 5 inches possible.

* WHERE...Portions of central, north central and south central
  Virginia.

* WHEN...From late tonight through Monday afternoon.

* IMPACTS...Plan on slippery road conditions. The hazardous
  conditions could impact the morning commute.
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7 minutes ago, Mercurial said:

It's going to keep shifting north until NYC sees snow.  Which puts DC and Balt firmly in the jackpot area, I suppose.

That looks to be happening seeing the RGEM yoda posted…the LWX zone forecasts are not that exciting at least for mine.  

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LWX AFD

Dramatic shifts in guidance over the past 12 hours for a
potential snowstorm tonight through midday Monday for the 
southern half of our CWA, bisecting very close to the major 
metropolitan areas. 

Digging H5 trough over the southern plains will amplify today,
cut-off an upper low tonight over the Carolinas, then go 
negative tilt as it crosses the mid-Atlantic coast Monday 
morning. The reflection at the surface will be the development 
of low pressure, rapidly deepening and tightening tonight over 
the southeast US to a position over Cape Hatteras by daybreak
Monday. At the same time, cold Canadian air will quickly filter
in aloft, bringing H85 temps well below 0C for much of the 
entire CWA by 12Z Monday. 

00Z GFS, ECMWF, NAM all have at least advisory level snowfall 
accumulations essentially south of I-66/US-50. 05Z NBM, which 
was followed closely in development of snowfall accumulations 
this morning, dampens the largest snowfall contributor -- the 
GFS, and splits the difference between that model and the 
lesser accumulating NAM. Because of the large variations and
the dramatic shift in guidance, advisories have been issued west
of I-95 where the precipitation onset will start shortly after
midnight tonight, and watches issued along and E of I-95. There
will be a tight gradient of snowfall accumulation north of the
Nation's Capital, and potential warnings and advisories will
most certainly be modified as guidance hopefully converges with
a solution over the next 12 hours.

The most likely snowfall forecast should be used with caution,
with probabilities of higher amounts, towards the 90th 
percentile, should strongly be considered for planning 
purposes. Please continue to check back as we modify this
forecast in the coming hours.

 

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Damn... from morning LWX AFD 

"The most likely snowfall forecast should be used with caution, with probabilities of higher amounts, towards the 90th percentile, should strongly be considered for planning purposes. Please continue to check back as we modify this forecast in the coming hours."

 

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Just now, yoda said:

Damn... from morning LWX AFD 

"The most likely snowfall forecast should be used with caution, with probabilities of higher amounts, towards the 90th percentile, should strongly be considered for planning purposes. Please continue to check back as we modify this forecast in the coming hours."

 

It’s like we have landed in some alternate universe where the weenies have grabbed the control panel

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URGENT - WINTER WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
428 AM EST Sun Jan 2 2022

DCZ001-MDZ013-014-016>018-VAZ052>057-021730-
/O.NEW.KLWX.WS.A.0001.220103T0600Z-220103T1800Z/
District of Columbia-Prince Georges-Anne Arundel-Charles-
St. Marys-Calvert-Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-Spotsylvania-
King George-
428 AM EST Sun Jan 2 2022

...WINTER STORM WATCH IN EFFECT FROM LATE TONIGHT THROUGH MONDAY
AFTERNOON...

* WHAT...Heavy snow possible. Total snow accumulations of 3 to 6
  inches possible.

* WHERE...Portions of The District of Columbia, central and
  southern Maryland and central and northern Virginia.

* WHEN...From late tonight through Monday afternoon.

* IMPACTS...Plan on slippery road conditions. The hazardous
  conditions could impact the morning commute.

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URGENT - WINTER WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
428 AM EST Sun Jan 2 2022

VAZ025>027-029-030-037>040-050-051-501>504-507-WVZ505-506-021730-
/O.NEW.KLWX.WW.Y.0001.220103T0600Z-220103T1800Z/
Augusta-Rockingham-Shenandoah-Page-Warren-Albemarle-Greene-
Madison-Rappahannock-Orange-Culpeper-Northern Fauquier-
Southern Fauquier-Western Highland-Eastern Highland-
Northern Virginia Blue Ridge-Western Pendleton-Eastern Pendleton-
428 AM EST Sun Jan 2 2022

...WINTER WEATHER ADVISORY IN EFFECT FROM 1 AM TO 1 PM EST
MONDAY...

* WHAT...Snow. Additional snow accumulations of 2 to 4 inches.

* WHERE...Portions of central, northern, northwest and western
  Virginia and eastern West Virginia.

* WHEN...From 1 AM to 1 PM EST Monday.

* IMPACTS...Plan on slippery road conditions. The hazardous
  conditions could impact the morning commute.
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