Jump to content
  • Member Statistics

    17,507
    Total Members
    7,904
    Most Online
    SnowHabit
    Newest Member
    SnowHabit
    Joined

Central PA - second half of March 2013


Recommended Posts

  • Replies 1.1k
  • Created
  • Last Reply

Map looks solid. Expand the 6-8 in Cameron county into Clearfield and Centre. 

I think warnings go out for the central mountain counties, northern tier and Laurels/Alleghenies counties. Advisories likely from IPT south along the Susquehanna and the ridge/valley counties like Juniata and Huntingdon, although they might get a good dumping also. The toughest call seems to be for places like Lewistown, Bedford and the south-central ridge and valley region.

Link to comment
Share on other sites

I'm thinking 5-7" generally along I-99 including UNV and AOO, maybe spots to 8"-same for areas further west including FIG/DUJ. JST generally the same deal, 4-6" I'd say before going to sleet/ZR. 4-6" also for IPT and then 2-5" south from SEG to around Harrisburg. 1-3" southeast of there. There could be more if the front end comes in heavy right away-these can sometimes bust well and the airmass looks pretty cold and dry for now. 12z models seem to be trending slightly colder, which is typical of CAD scenarios where they catch on last-minute. The Euro from yesterday was probably overdone but I could see a nice surprise in store for some.

 

This pretty much matches my thoughts.

Link to comment
Share on other sites

I'd look at RAP, NAM and RGEM, GFS inside 24hrs than anything else. 

 

Haha, well we'll agree to disagree on all of the above, except maybe the RGEM. I'd probably trust the following models most at around 24 hrs out:

1. Euro

2. UKMET

3. RGEM

4. GFS/NAM blend

5. Anything else. :P

Link to comment
Share on other sites

Yes. Which makes it that much more disappointing to me that it (again, in my opinion :P ) performs better than the models that are supposed to do well within 48 hrs.

lol yea... really makes the american models look bad when a medium range model can outperform a near range one...

Link to comment
Share on other sites

Just because one event or multiple systems did not pan out for snow accumulations for a region, it has no baring on what will happen with a future storm. That reasoning has no statistical or scientific evidence to support any sort of forecast. 

I would somewhat disagree with this.  while each storm is unique, patterns tend to develop which can lead to repetitive occurrences.  1 rule I've used which seems to work pretty well is to forecast the pattern until the pattern is broken.  I'm not saying that this storm definitely won't produce snow in areas that haven't seen much so far this winter, but if you're in a marginal area with this one I would bet this is not the pattern breaker.

Link to comment
Share on other sites

I personally don't know about the icing danger unless youre talking about terrain with deeper locked in cold. I find it hard to believe that freezing rain will be so prevalent with marginal low layer temps. If this was Jan, then maybe, but I just see this being white/ slushy. Nice map eastern!

Link to comment
Share on other sites

I would somewhat disagree with this. while each storm is unique, patterns tend to develop which can lead to repetitive occurrences. 1 rule I've used which seems to work pretty well is to forecast the pattern until the pattern is broken. I'm not saying that this storm definitely won't

produce snow in areas that haven't seen much so

far this winter, but if you're in a marginal area with this one I would bet this is not the pattern breaker.

I agree with this. Not saying we can't see snow down this way tomorrow, but I'd wager a much better chance on getting something significant from a large dynamic coastal to get it done down here.

Link to comment
Share on other sites

I personally don't know about the icing danger unless youre talking about terrain with deeper locked in cold. I find it hard to believe that freezing rain will be so prevalent with marginal low layer temps. If this was Jan, then maybe, but I just see this being white/ slushy. Nice map eastern!

 

Thanks. I agree. With surface temps at 31-32 and the solar radiation I find it hard to believe the ice will be able to stick much without melting off. 

Link to comment
Share on other sites

I'm forecasting for Weather World again tomorrow, but thankfully the snow should start before air time so it should be an easier forecast.  Here is the latest RPM for those interested...

 

3502vz8.png

 

I've heard the RPM is a horrible horrible model. Any met can fill us in if that is true? From each storm so far I have seen it has been terrible. Had 17" for me for the March 6th storm. lol

Link to comment
Share on other sites

I personally don't know about the icing danger unless youre talking about terrain with deeper locked in cold. I find it hard to believe that freezing rain will be so prevalent with marginal low layer temps. If this was Jan, then maybe, but I just see this being white/ slushy. Nice map eastern!

I could see freezing rain being a threat somewhere-the NAM wants to warm up the mid-low levels such as 850mb before the surface, and the 32 deg line hangs out for quite some time in the mid Susq. valley and over to the ridges/valleys west of there, so there could be a zone where the cold is shallow enough for freezing rain.

Link to comment
Share on other sites

I've heard the RPM is a horrible horrible model. Any met can fill us in if that is true? From each storm so far I have seen it has been terrible. Had 17" for me for the March 6th storm. lol

We use the RPM for our "Predictor" model. It's pretty good inside of 12 hours but has its faults (doesn't every model?)...about 24-48 hours out it gets funky and can go from very conservative to VERY aggressive from run to run. Past 48 hours it does a pretty good job again. Screwy little model.

In this case, I think it's a bit over done on some amounts. That sun-angle is going to be a real potential bust-maker if you don't have some heavy rates or locked into the low-level cold air. I think a coating-1" is good for more of the LSQV with 1-3" from the I-81 north and 3-6 for Central PA up on north. Some ridges could pick up 8, but likely near I-99 or north of UNV

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

Guest
This topic is now closed to further replies.
  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...