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Feb 9: Iggles flying, weenies high-fivin’: the kickoff to a great stretch


mahk_webstah
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17 minutes ago, OceanStWx said:

Let's call it 15:1 average SLR there, that's going less than .33" QPF on the high side, 0.20" on the low side.

71% of the ensemble members are 0.5" or more QPF. Gimme the over.

.33 LE sounds about right to me. 15:1 is on high side up here for ratios. You’re good on lack of compaction but weak on lift, in DGZ, as I see it. 

That’s 5” at high side; 4” if you use 12/13:1


Also why is the 29% portion wrong? Any reasoning? 

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1 minute ago, jbenedet said:

.33 LE sounds about right to me. 15:1 is on high side up here for ratios. You’re good on lack of compaction but weak on lift, in DGZ, as I see it. 

That’s 5” at high side; 4” if you use 12/13:1


Also why is the 29% portion wrong? Any reasoning? 

There are a few reasons why I prefer the over on QPF.

I'm seeing soundings supportive of around a 15:1 average in the area (200-300 mb deep could support upwards of 20:1 at times). There's a decent crosshair signature around 06z (estimating between PSM and LCI soundings), that's pretty good for 6" snow. The WAA forcing is strong and displaced north of QPF max, which is a red flag that some deterministic guidance may not have things far enough north (which is not uncommon for a high bias on QPF on the equatorward side of systems).

The only pause I would have is if there is a messenger shuffle south today. That would introduce a DGZ that is starting to get a bit high in the column for ideal ratios, that's why my totals drop off sharper to the north. I'm not sure I've seen anything significant enough to warrant concerns where I have warnings up.

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