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Jan 21-22 Coastal Crusher Discussion/Model Thread


earthlight

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guys and gals, just a bit of info here that i'm spreading to all the east coast forums. for the next 18-24 hours, you're getting some extra meso-ensemble model help from out here in the mid-west. John Wetter, who runs the HopWRF out here, has shifted the domain east to cover most of the east coast.

 

hope it helps in any short-range stuff.

 

hopwrf.info is the site.

 

here's his tweet showing the area.

 

 

We have hopped! This domain will be in place starting with the 12Z runs (available around 10 AM). #northeastsnow http://ow.ly/i/4lOAs

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That HRRR map is 10 to 1 , it looks great - has the Max right in where it should be . increase those totals by 50 to 70 perc IMO 

It might look great but doesn't line up with where the banding is setting up. Shift the HRRR map 20-30 miles south an it looks right to me. The current banding also lines up well with 850mb Frontogenesis   

 

http://www.spc.noaa.gov/exper/mesoanalysis/new/viewsector.php?sector=17#

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The RAP looks great...HRRR very nice as well. RGEM cut back big time from the 00z run, a good 50 miles SE now

RGEM always does the cut down at this time frame just before a storm. It's past it's wheelhouse range at this point. 0z was probably it's last reliable depiction.

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Gives my local area a decent band with impressive snow totals. How accurate is this typically?

 

Best.

Take a blend of the 4k nam HRRR  RAP at this point . and check the radar , and see if the returns match the forecast . 

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It might look great but doesn't line up with where the banding is setting up. Shift the HRRR map 20-30 miles south an it looks right to me. The current banding also lines up well with 850mb Frontogenesis   

 

http://www.spc.noaa.gov/exper/mesoanalysis/new/viewsector.php?sector=17#

Matches the 4k NAM , But if its 25 miles too N , gotta expect stuff like that   I  like the look of the RAP . But i kinda blend em , and I think the Philly  NYC L I corridor , still looks spot on to me  .

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Here comes the major freak out, I can sense it. I'm getting light to moderate snow here and I'm currently only under 5-10dbz returns. That heavy banding down south is forecast to move northward and fall apart some, but not before dumping warning criteria snowfall on the area. This slight tick downward in QPF on the globals is very typical as an event is ongoing. It's better to use the high res modeling at this point and observations. Those are your best bet. Nobody was really forecasted in this forum to be in heavy snow until mid-afternoon.

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Matches the 4k NAM , But if its 25 miles too N , gotta expect stuff like that   I  like the look of the RAP . But i kinda blend em , and I think the Philly  NYC L I corridor , still looks spot on to me  .

The city on south and east has for a while looked like it was in the best shape for this. The distribution of snow amounts may look a lot like 1/2/14 at the end of the day. North of where the main banding sets up, like maybe up past Newburgh, there will likely be a rip-off zone.

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guys and gals, just a bit of info here that i'm spreading to all the east coast forums. for the next 18-24 hours, you're getting some extra meso-ensemble model help from out here in the mid-west. John Wetter, who runs the HopWRF out here, has shifted the domain east to cover most of the east coast.

 

hope it helps in any short-range stuff.

 

hopwrf.info is the site.

 

here's his tweet showing the area.

 

Thanks for the nugget! Another tool in the short range forecasting arsenal; we need it to put some meteorological sense into the nowcasting jitters and hysteria that often begets most snowstorms in-situ.

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Stop looking at the GFS/Euro for this event. Stick to the 4k NAM, RAP, HRRR, RGEM ect.

 

While the hi-res models are obviously more accurate in the short-range, it isn't as if global models are less accurate in the short term and then suddenly get more accurate in the medium range. The hi-res mesoscale models will (hopefully) be able to pick up on banding and such, but I feel like there's a lot of sentiment (not necessarily from you, but in general) that the larger scale models are "out of their range" in the short term, which just isn't true. The relative usefulness of hi-res vs. global models just changes. 

 

 

Gives my local area a decent band with impressive snow totals. How accurate is this typically?

 

Best.

 

It is NAM output, just multiplied by a factor of 10. You decide for yourself. :P

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While the hi-res models are obviously more accurate in the short-range, it isn't as if global models are less accurate in the short term and then suddenly get more accurate in the medium range. The hi-res mesoscale models will (hopefully) be able to pick up on banding and such, but I feel like there's a lot of sentiment (not necessarily from you, but in general) that the larger scale models are "out of their range" in the short term, which just isn't true. The relative usefulness of hi-res vs. global models just changes. 

 

 

 

It is NAM output, just multiplied by a factor of 10. You decide for yourself. :P

Why is it that the globals tend to always cut QPF right as an event is starting?

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