Jump to content

December 15-17, 2022 | Winter Storm


Penn State

Recommended Posts

  • Meteorologist
7 minutes ago, JDClapper said:

namconus_ref_frzn_eus_fh45-72.gif

Sharper ridge over us this run. Leads to more warmth going up the west side of the apps and allows the secondary to form more over central VA than along the coast. Noticeably early on though there is better CAD recognition maybe this will change the outcome as we get closer in time. There is fine line being treaded here also more noticeable is the potential of an actual snowstorm in the higher terrain of SNE and into lower Maine. Have to watch that in future runs.

850s don't seem to peak until precip is just about over so there is some possibility the model is rushing the changeover a bit. We don't necessarily have an anchored high to the north but it is still very much present leading up to the precip push. Would be cool to see skew t's for the NAM. 

  • LOVE 1
Link to comment
Share on other sites

  • Meteorologist
13 minutes ago, JDClapper said:

floop-rdps-2022121300.prateptype.us_ne.gif

Not a bad depiction I think it is overzealous with how much sleet there is in central PA but pretty good idea of the the slow temp change. If we can get the low about 50 miles east we could have a much colder solution again they always seem to run CAD out quickly. Aloft doesn't look great for us to stay all snow but also doesn't look all too terrible overall. 

Edited by so_whats_happening
  • LIKE 2
  • THUMBS UP 1
Link to comment
Share on other sites

  • Meteorologist
2 minutes ago, JDClapper said:

Stark differences in GFS and NAM. Meet in the middle? 🤷‍♂️

namconus_z500_mslp_eus_52.png

gfs_z500_mslp_eus_14.png

Yea unfortunately it is LR NAM so take it with some grains but overall the GFS depiction really isnt bad at all. It definitely highlights the area im concerned with for snowfall back over central and NE PA. As we move closer in time for New England the higher terrain stands the best chance for all snow coastal areas battle the rain snow 95 corridor overall being a solid cutoff for frozen and non. 

Solid jet enhancement coming into play (left exit region) which helps with the thumpiness. NAM also had a similar jet towards the end of the run. Should help enhance for SNE (initially elevation benefits the most but temps could crash enough toward the coast to allow some accumulations across CT, RI, and SE Mass) and southern and coastal Maine.

  • LOVE 1
Link to comment
Share on other sites

  • Meteorologist

Well then:

 

Quote

A pair of jet left exit regions arriving one after the other from the southwest will provide at least two periods of stronger forcing that could meld together and create steady moderate to heavy snow with rates of 1-2 inches per hour at times Thursday afternoon and evening, coinciding with the period of strongest llvl easterly flow. Although this upcoming event is an open wave embedded in the SW flow aloft, the increasing upper diffluence, and rapidly developing coastal low over the Delmarva Region Thursday night will create the potential for some heavy snow totals in excess of 10 inches across parts of the Central and Northern Mtns.

https://forecast.weather.gov/product.php?site=NWS&issuedby=CTP&product=AFD&format=CI&version=1&glossary=1&highlight=off

Link to comment
Share on other sites

NWS Sterling Sounding the alarm:

Clouds will be thickening Wednesday morning in advance of storm system developing over the TN River Valley and southern mid- Atlantic. Overrunning precip is expected to move into the central Shenandoah Valley and central VA Wed afternoon. With very high 850- 700 mb thicknesses, main p-type through Thu is expected to be frza west of the Blue Ridge Mountains, fzra to rain east of Blue Ridge and I-95, and mainly rain along and east of I-95. This is going to be a very heavy precip event with even the "driest" top three ensemble members from the EPS showing an inch or more of liquid and median values of 1.5 to 2.0 inches. The source of cold air is likely too far north (northern Quebec or Newfoundland) to keep the cold air in place for a long period of time, however, in-situ damming from evaporational cooling will likely help strengthen the wedge. Given the amount of precip expected, there is the potential for signifcant icing to occur across the higher elevs and deeper valleys in eastern WV and western MD. For this reason, a Winter Storm Watch has been issued for areas west of the Blue Ridge and Skyline Drive with likelihood of Ice Storm Warnings needed by Wed morning. The storm system will be crossing the area late Thu night with steady precip ending, but some wrap around rain/showers and mountain snow showers lingering into Fri. There is also the potential for strong winds across the mountains Thu that will have additional impacts on trees and powerlines with ice accretion and those in the mountain areas should be prepared for extended power outages and road closures.

Circled area is a common ice area above 1500' elevation. Time to watch. Certainly looks like 1/2"+ is a possibility. 

 

zr_acc.us_ne.png

Edited by MDBlueridge
  • YUCK 1
  • THUMBS DOWN 1
Link to comment
Share on other sites

  • Admin

The strong easterly winds over the gulf of Maine might be tough to overcome up here.  Not expecting any impressive CAD with the lack of snow cover.

ecmwf_mslp_wind_neus_32.png.1d84c29fd01d9ab382755238c97d7400.png

Looking like a straight rain/snow situation. Worst case scenario is a little of both, and it's a paste bomb.  

  I'll try to contribute some today. Tried working yesterday, but the kids got me sick, and I am wiped out after trying to work though it yesterday.

  • SHOCKED 2
  • THUMBS UP 1
Link to comment
Share on other sites

  • Admin
7 minutes ago, JDClapper said:

EPS up to a 5" mean snowdepth bump. Couple clusters in there. One in the 4/5" area and another in the 7/8" area.

NAM still concerning. Hopefully just a hiccup and comes back to pappa in a couple hours.

Screenshot_20221213-063450_Chrome.jpg

Seems like you guys and gals are fighting the 850 mb warmth, where we are fighting the lowest levels. At least within 25 miles of the coast. Hoping ski country can cash in 

 

Screenshot_20221213-063945.png

Screenshot_20221213-064110.png

Screenshot_20221213-064212.png

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...