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Jan 11-12 Model/Forecasting Discussion


Ji

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I agree, I think people tend to ride a roller coaster when in reality the models are often vacillating between solutions. Part of it is the emotional attachment to snow that most here have....me too. most of the time, it's wise not to change forecasts based on one model flipping for one run as it might flip back. I like the CWG handling of the system.

it is hard to be totally detached.. yesterday at 18z you saw me questioning if i was still being too weenie by going toward the bullish end of the conservative side. that could still be the case... i do really want it to snow. case to case outside 3-5 days or so most people would do far better emotionally and accuracy wise to heavily weight climo, be it overall, enso etc, or seasonal based. i know we all love snow but a day 5-10 6-12"+ snowstorm is pretty unlikely to happen as you of course well know.

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it's too early to congratulate anyone but im very happy with the progression based on my thoughts the last 5 days or so. i've tried to come to conclusions myself more than follow anyone but a huge part of my overall forecasting knowledge these days comes from cwg and wes so i gotta give props to the teachers.

Yeah, it's not wise to accept congrats before the event has played out. I've liked how we've handled it but did for the dec 26 storm too and that didn't work that well.

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6Z GFS gave BWI .23" qpf and Bufkit had 5.3" of snow

I know Bufkit is generally high w/snow totals, but still, 4-5" on 12Z qpf may be doable IF IT VERIFIES

The GFS QPF is virtually unchanged from 6z.

4-5" may be on the table if a miracle happens and the NAM verifies.

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Yes, but they've had that map even when I woke up to the WSW.

The downgrade to a WWA is inevitable.

i think the nam/gfs probably would still support a warning balt and ne whether or not it verifies

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StnID: kmtn Model: nam Run: 20110110/1200 Cloud RH threshold: 85% Sleet Ratio: 2:1 || CarSnowTool Beta 5.4

110112/0000Z 36 10007KT 30.2F SNOW 8:1| 0.0|| 0.0 0.004|| 0.00 0.00|| 0.00 0.00|| 0.00 100| 0| 0

-------------------------------------------------------------------------------------------------------------------

Date/hour FHr Wind SfcT Ptype SRat|Snow||TotSN QPF ||TotQPF Sleet||TotPL FZRA||TotZR S%| I%| L%

-------------------------------------------------------------------------------------------------------------------

110112/0100Z 37 09007KT 30.2F SNOW 13:1| 0.3|| 0.3 0.020|| 0.02 0.00|| 0.00 0.00|| 0.00 100| 0| 0

110112/0200Z 38 09006KT 30.2F SNOW 13:1| 0.4|| 0.7 0.031|| 0.06 0.00|| 0.00 0.00|| 0.00 100| 0| 0

110112/0300Z 39 VRB02KT 30.7F SNOW 14:1| 0.9|| 1.6 0.067|| 0.12 0.00|| 0.00 0.00|| 0.00 100| 0| 0

110112/0400Z 40 34005KT 30.6F SNOW 17:1| 1.7|| 3.3 0.098|| 0.22 0.00|| 0.00 0.00|| 0.00 100| 0| 0

110112/0500Z 41 36005KT 30.6F SNOW 21:1| 1.7|| 5.0 0.083|| 0.30 0.00|| 0.00 0.00|| 0.00 100| 0| 0

110112/0600Z 42 36005KT 30.2F SNOW 17:1| 1.0|| 6.0 0.059|| 0.36 0.00|| 0.00 0.00|| 0.00 100| 0| 0

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

110112/0700Z 43 33005KT 30.0F SNOW 16:1| 0.6|| 6.6 0.035|| 0.40 0.00|| 0.00 0.00|| 0.00 100| 0| 0

110112/0800Z 44 30005KT 29.8F SNOW 27:1| 0.4|| 7.0 0.016|| 0.41 0.00|| 0.00 0.00|| 0.00 100| 0| 0

110112/0900Z 45 29005KT 29.7F SNOW 22:1| 0.3|| 7.3 0.012|| 0.43 0.00|| 0.00 0.00|| 0.00 100| 0| 0

I will take it

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Don't take the 12z NAM at face value, you should know that it is probably still overdoing our QPF. We'll probably get a solid 2-4", which would perfectly fall into the criteria of an advisory.

Our winter storm watch is probably based on the 0z NAM, which I think is way overdone. They will downgrade to a WWA eventually, I'll be shocked if they don't.

They probably will, and I agree with you about our totals.

I just think it's kind of odd that we are (as you admit) literally just ONE inch away from warning criteria (and over it according to some guidance) and you are insisting that there is "no way" it will happen. It probably won't, but making definitive statements when small changes can make a big difference seems odd. I think a Watch was the right call - and probably going to an advisory will also be the right call. But insisting one way or another is misgudied imo.

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StnID: kmtn Model: nam Run: 20110110/1200 Cloud RH threshold: 85% Sleet Ratio: 2:1 || CarSnowTool Beta 5.4

110112/0000Z 36 10007KT 30.2F SNOW 8:1| 0.0|| 0.0 0.004|| 0.00 0.00|| 0.00 0.00|| 0.00 100| 0| 0

-------------------------------------------------------------------------------------------------------------------

Date/hour FHr Wind SfcT Ptype SRat|Snow||TotSN QPF ||TotQPF Sleet||TotPL FZRA||TotZR S%| I%| L%

-------------------------------------------------------------------------------------------------------------------

110112/0100Z 37 09007KT 30.2F SNOW 13:1| 0.3|| 0.3 0.020|| 0.02 0.00|| 0.00 0.00|| 0.00 100| 0| 0

110112/0200Z 38 09006KT 30.2F SNOW 13:1| 0.4|| 0.7 0.031|| 0.06 0.00|| 0.00 0.00|| 0.00 100| 0| 0

110112/0300Z 39 VRB02KT 30.7F SNOW 14:1| 0.9|| 1.6 0.067|| 0.12 0.00|| 0.00 0.00|| 0.00 100| 0| 0

110112/0400Z 40 34005KT 30.6F SNOW 17:1| 1.7|| 3.3 0.098|| 0.22 0.00|| 0.00 0.00|| 0.00 100| 0| 0

110112/0500Z 41 36005KT 30.6F SNOW 21:1| 1.7|| 5.0 0.083|| 0.30 0.00|| 0.00 0.00|| 0.00 100| 0| 0

110112/0600Z 42 36005KT 30.2F SNOW 17:1| 1.0|| 6.0 0.059|| 0.36 0.00|| 0.00 0.00|| 0.00 100| 0| 0

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

110112/0700Z 43 33005KT 30.0F SNOW 16:1| 0.6|| 6.6 0.035|| 0.40 0.00|| 0.00 0.00|| 0.00 100| 0| 0

110112/0800Z 44 30005KT 29.8F SNOW 27:1| 0.4|| 7.0 0.016|| 0.41 0.00|| 0.00 0.00|| 0.00 100| 0| 0

110112/0900Z 45 29005KT 29.7F SNOW 22:1| 0.3|| 7.3 0.012|| 0.43 0.00|| 0.00 0.00|| 0.00 100| 0| 0

I will take it

lol at the ratios.

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You think upper air maps show better potential than what those runs have on the surface?

not necessarily but it's close enough in that area that you could bust low going cautious. hopefully for the nws things will be a little clearer by the time they have to pull the trigger.

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the odds busting low are greater than us busting on the higher end...right?

Don't pulll the trigger on a WSW if you don't have to

historically yes.. in this case probably yes that is if you mean ending with less rather than more

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