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Everything posted by ORH_wxman
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I doubt it trends much…it’s been amazingly consistent for days (I know Tip posted something similar). But small nuances could help…if we can get just a little more vort energy on the eastern flank of that trough, it would really help that WCB be more intense and perhaps also nudge the secondary reflection a little deeper which would lock in lower level cold more efficiently. We’re not talking drastic changes but it could be like the difference between 2” and then rain with temps getting to 40-43F in a place like Bedford versus 5” and temps never really getting above 35F.
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There’s almost two different WAA precip batches…the first initial one is pretty good from like N NJ to S CT and it’s weakening as it lifts north from there and then another reorganizes about 8 hours later but by that point, we’re starting to warm aloft so that batch is mainly for N of MA/NH border. We got caught in between….hopefully that doesn’t happen but some models have shown that. 18z NAM actually got us decent with the initial band. Didn’t weaken it as fast.
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Jet mechanics FTW. I think Chris posted it earlier and I was discussing yesterday, but we have a pretty impressive left exit region with this CCB so that got the job done. Sometimes we’ll have a ULL/energy swinging underneath us but not much jet assist, and it can just be light to moderate stuff, but we were able to get that extra enhanced lift to get heavy bands.
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Over-stating attribution is just as anti-science as implying there is none.
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What is the physical mechanism though? Models aren't taking a hypothetical mid-20th century climate and trying to apply it to 2023.....they are ingesting real time data. A smaller PV might make the model performance a bit worse because models perform worse in lower gradient environments....however, the model verification score improvement is at odds with that theory becoming dominant. Models are improving faster than any sort of "shrinking PV" can offset that performance.
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No it does not mean that.....just the average temp of the globe was 1C cooler. The arctic is where the most warming has happened, so it might be like 4C cooler there....while in many tropical areas it hasn't warmed at all. In our case in the state of MA, if we take the average DJFM temps from the middle 20th century and do a least squares regression, we've warmed at about 0.18C per decade which equates to about 1.3C of warming where we are. So it happens that our area is pretty close to that 1C of warming as it turns out but that won't be true everywhere.