WxUSAF
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Everything posted by WxUSAF
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That’s probably not a terrible equation? I’d be really interested if you actually did a running comparison of that and see how it verified.
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Mid-Atlantic winter 2019-20 snowfall contest
WxUSAF replied to PrinceFrederickWx's topic in Mid Atlantic
BWI: 20.3” DCA: 14.7” IAD: 22.5” RIC: 12.1” SBY: 9.8” -
You shouldnt be. As I think @LP08 is alluding to, it’s maybe useful as a quick look on whether a period of time has potential, but that’s it. Especially as we go into winter, our “background” ensemble snow mean through D15 is like 2”.
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Email [email protected] for complaints
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Speaking of every model run, 0z euro gave us snow D9 and nobody even mentioned it!!?!
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Going to the MD football game Saturday. NAM says upper 30s and raining
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That’s been on my mind a lot. We got majorly teased last year and then it all turned to total crap for 30 days. Although we did miss a KU by like 100 miles...
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As @Bob Chill posted, 18z GFS shows that December 3-4th threat window. Boundary doesn’t get dragged far enough south, but interesting.
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Hmmm...that's nice to see that the EPS is coming around to the idea of a -EPO/-NAO pattern in early December. Should be plenty of cold air around and with the trough in the west, that should keep the boundary sort of near us, but on balance to our south, and set up some potential overrunning events. GEFS is certainly advertising a robust STJ to keep the pattern active/wet.
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Interesting discrepancy between the new GFS and the GEFS for the weekend storm. GEFS emphatically says it goes under us while GFD cuts it west. Wonder how the new dynamical core is playing here.
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In the unlikely event that the GEFS is right about the early December pattern, there would be a legit storm window around the 3-4th. Strong -NAO with a 50-50, and ridging out west.
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Storms get trapped under it and help build the block as they break.
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Raleigh on board with similar pattern evolution
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Last year the GEFS rushed the SSW, but it did eventually come. If the MJO wave makes it to phase 3, that might be a trigger as SSW have happened at that MJO phase in the past often. Even Webb this morning is honking for some major winter weather later in December when the Pac and NAO align. Knowing the GEFS, it probably is rushing the -EPO reestablishment, but you can see the Eps moving that way more slowly.
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All depends on timing of the frontal passage. We will torch ahead of that front it seems, although maybe just for 12-24 hours. Air behind the front looks seasonal, not particularly cold.
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Euro has highs near 50/low 50s. Seasonal. Gfs is near 60. GGEM is mid 40s. GEFS close to euro.
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12z GEFS continues with poleward ridging near the west coast starting around the turn of the month. Ridging just off the coast supports a Plains centered trough, but the -NAO ridging mutes any SE ridge tendency. Still a pattern that probably doesn’t support much snow chances in early December, but one heading in a good direction. And LR has been volatile, so don’t get too cozy with any look.
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GFS went west with the Saturday storm, but GGEM (and maybe icon?) still show a snow/mix threat for the northern tier. Likely last shot at any November frozen.
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Looks like Eps didn’t change too much. Maybe a bit larger area of high heights in the NAO domain and over the pole.
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Lots of changes on the overnight GEFS run after thanksgiving. Models definitely having trouble with the Pac. But I’d certainly take what the GEFS is selling in early December.
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Webb says winter will arrive! Although early/mid January seems pretty normal for a Nino, not that early.
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If you want something positive to look at, select northern hemisphere MSLP anomaly on the 18z GEFS and scroll to about hr160+. Lots of red in Santa land means a -AO.
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Ha, you’re more positive than I am about that. That weekly map looks like a sneeze away from a blowtorch. But it’s the weeklies and they’re usually awful. Like I said yesterday, a December with 1-2 accumulation events, less than 3F above normal, and no 60F around Xmas.
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It still looks like the AO and NAO are generally favorable for us for the next 2 weeks. Let's keep that going. We've seen the last 2+ weeks what that can do with a favorable Pac long wave pattern. Do that again in a winter month and I think we'll be rockin. Clearly the models are having a more difficult time figuring out the Pac as we've seen from the +PNA/-EPO look we were getting around Thanksgiving to the -PNA/+EPO pattern advertised now. Probably not worth looking past D7-8 for much.
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^thats all Pac air though. So maybe slightly below normal temps, but probably not an airmass that can snow in early December.
