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Central PA Thread


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Models continue to show a wintry mix for much of the area Saturday. Again, this setup will be sensitive to temperatures. Here is the KUNV printout from the 12z NAM.

source: http://www.meteor.iastate.edu/~ckarsten/cobb/cobb.php?model=nam&site=kunv

Date/hour FHr Wind SfcT Ptype SR |Snow||Sleet|| FZRA|| QPF CumSR|TotSN||TotPL||TotZR|| TQPF S%| I%| L%

120121/0900Z 69 15011KT 22.8F SNPL 8:1| 0.1|| 0.01|| 0.00|| 0.008 8:1| 0.1|| 0.01|| 0.00|| 0.01 62| 38| 0

120121/1000Z 70 15011KT 23.2F SNPL 5:1| 0.0|| 0.00|| 0.00|| 0.004 7:1| 0.1|| 0.01|| 0.00|| 0.01 50| 50| 0

120121/1100Z 71 15011KT 24.1F SNPL 1:1| 0.0|| 0.01|| 0.00|| 0.004 6:1| 0.1|| 0.02|| 0.00|| 0.02 20| 80| 0

120121/1200Z 72 15011KT 24.1F PL 0:1| 0.0|| 0.02|| 0.00|| 0.008 6:1| 0.1|| 0.03|| 0.00|| 0.02 2| 98| 0

----------------------------------------------+----++-----+-------------++--------------++-------------++-----------+---+---

120121/1300Z 73 15011KT 24.4F FZRA 0:1| 0.0|| 0.00|| 0.01|| 0.012 6:1| 0.1|| 0.03|| 0.01|| 0.04 0| 0|100

120121/1400Z 74 15011KT 25.9F FZRA 0:1| 0.0|| 0.00|| 0.00|| 0.004 6:1| 0.1|| 0.03|| 0.02|| 0.04 0| 0|100

120121/1500Z 75 15009KT 27.9F FZRA 0:1| 0.0|| 0.00|| 0.02|| 0.024 6:1| 0.1|| 0.03|| 0.04|| 0.06 0| 0|100

120121/1600Z 76 14008KT 28.6F FZRA 0:1| 0.0|| 0.00|| 0.10|| 0.098 6:1| 0.1|| 0.03|| 0.14|| 0.16 0| 0|100

120121/1700Z 77 15010KT 30.7F FZRA 0:1| 0.0|| 0.00|| 0.07|| 0.063 6:1| 0.1|| 0.03|| 0.21|| 0.22 0| 0|100

120121/1800Z 78 16010KT 31.1F FZRA 0:1| 0.0|| 0.00|| 0.06|| 0.059 6:1| 0.1|| 0.03|| 0.27|| 0.28 0| 0|100

----------------------------------------------+----++-----+-------------++--------------++-------------++-----------+---+---

120121/1900Z 79 16008KT 31.8F FZRA 0:1| 0.0|| 0.00|| 0.02|| 0.024 6:1| 0.1|| 0.03|| 0.30|| 0.31 0| 0|100

120121/2000Z 80 15006KT 32.2F RAIN 0:1| 0.0|| 0.00|| 0.00|| 0.028 6:1| 0.1|| 0.03|| 0.30|| 0.33 0| 0|100

120121/2100Z 81 15003KT 32.4F RAIN 0:1| 0.0|| 0.00|| 0.00|| 0.083 6:1| 0.1|| 0.03|| 0.30|| 0.42 0| 0|100

120121/2200Z 82 16003KT 32.4F RAIN 0:1| 0.0|| 0.00|| 0.00|| 0.094 6:1| 0.1|| 0.03|| 0.30|| 0.51 0| 0|100

120121/2300Z 83 VRB01KT 32.7F RAIN 0:1| 0.0|| 0.00|| 0.00|| 0.012 6:1| 0.1|| 0.03|| 0.30|| 0.52 0| 0|100

120122/0000Z 84 VRB02KT 32.5F 0:1| 0.0|| 0.00|| 0.00|| 0.000 6:1| 0.1|| 0.03|| 0.30|| 0.52 0| 0| 0

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Low levels look to stay below freezing for many areas north of the Mason-Dixon line, although I would be more cautious and mention the Pennsylvania turnpike as a good placement for the 2m 0C line for the LSV. During ice storms, low QPF rates generally allow for more ice accretion than heavier rates/hr. I would definitely keep a close eye on the ice storm potential between I-80 and I-76. The event will be occurring diurnal hours and therefore help to prevent accretion a tad.

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Low levels look to stay below freezing for many areas north of the Mason-Dixon line, although I would be more cautious and mention the Pennsylvania turnpike as a good placement for the 2m 0C line for the LSV. During ice storms, low QPF rates generally allow for more ice accretion than heavier rates/hr. I would definitely keep a close eye on the ice storm potential between I-80 and I-76. The event will be occurring diurnal hours and therefore help to prevent accretion a tad.

Mid jan at 29-30 deg idk

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GFS shows quite a bit more digging of the s/w.

The downstream setup sucks but guess we'll see where it goes from here.

GFS a heck of alot better than the 12z NAM, which might be warmer looking at the onset than this past event. NAM seemed to be rolling the wave in flatter and at a higher latitude than the GFS.

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GFS a heck of alot better than the 12z NAM, which might be warmer looking at the onset than this past event. NAM seemed to be rolling the wave in flatter and at a higher latitude than the GFS.

Yeah. Still in the NAM's LOL range so taking it with a grain of salt...though UKMET and GGEM are leaning more towards the NAM than they are the current GFS solution.

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Not seeing a lot of discussion about possible even tomorrow night. Looks like there's a general .1-.2" QPF across C PA with more west. Definite potential for an inch or two with cold temps all around.

Yeah I think JST could see 1-3" and the AOO-UNV-IPT corridor could see 0.5-2". Should have no trouble sticking. I'll be up in the State College area tomorrow afternoon and into Friday, so I'm hoping to see at least a bit of snow.

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Yeah I think JST could see 1-3" and the AOO-UNV-IPT corridor could see 0.5-2". Should have no trouble sticking. I'll be up in the State College area tomorrow afternoon and into Friday, so I'm hoping to see at least a bit of snow.

Ya I am thinking 2-4" from pitt to AOO, JST

1-3" UNV/IPT

and .5-1.5" (more west) HGR to like MDT (.5?)

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Ya I am thinking 2-4" from pitt to AOO, JST

1-3" UNV/IPT

and .5-1.5" (more west) HGR to like MDT (.5?)

It's always a tough call with these systems, especially SE of State College. They can under-perform or over-perform so easily. The NAM doesn't show much of any precip once SE of a Bedford-Lewistown-Lewisburg line. GFS has at least a few hundredths all the way to the Mason-Dixon line. Shippensburg-Carlisle-Harrisburg-Lebanon might manage a dusting to a couple tenths of an inch.

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It's always a tough call with these systems, especially SE of State College. They can under-perform or over-perform so easily. The NAM doesn't show much of any precip once SE of a Bedford-Lewistown-Lewisburg line. GFS has at least a few hundredths all the way to the Mason-Dixon line. Shippensburg-Carlisle-Harrisburg-Lebanon might manage a dusting to a couple tenths of an inch.

Ya. It is tough. I know one time it was expected for a clipper to dry up over the area and only 1" was expected. We got 5". So you never know. I just want some white on the ground.

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Yeah. Still in the NAM's LOL range so taking it with a grain of salt...though UKMET and GGEM are leaning more towards the NAM than they are the current GFS solution.

Additionally I think we need to install a LOL range on the European given its performance this winter, perhaps outside of 84 hours.

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So basically the Euro has the system doing exactly what yesterdays system just did?

Talking about the 24/25 storm.

0z troff dumps into Northern Mid Atlantic causing a surface low track off the Delmarva tracking NNE over CC and eventually into Atlantic Canada (occludes just North of CC)

12z is a panhandle hooker. Surface low Wichita to Chicago with occlusion over Ontario.

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Talking about the 24/25 storm.

0z troff dumps into Northern Mid Atlantic causing a surface low track off the Delmarva tracking NNE over CC and eventually into Atlantic Canada (occludes just North of CC)

12z is a panhandle hooker. Surface low Wichita to Chicago with occlusion over Ontario.

Ohhhhh, haha. I hate having to wait for the whole run to complete to see the full Euro.

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