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Everything posted by high risk
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Tropical Storm Debby: Mid-Atlantic Impacts
high risk replied to WxWatcher007's topic in Mid Atlantic
Yeah, Friday will be a convective deluge in the warm sector. We'll see if the NAM is correct with the western track, although it does have the support of the Euro -
While the many individual members take multiple different paths to get there, the ensemble means for precipitation through the end of next weekend are all very wet for our area, without the east-west gradient seen in some recent deterministic solutions.
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Several CAMs have isolated moist blobs late Monday as well.
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looks like perhaps an MRGL for Thursday
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The signals there are encouraging for sure, and it's indicative of a chance of beneficial rains for a larger part of the area that's higher than we've seen in a while. The worry, though, is that these are the low-res models that aren't suited for capturing mesoscale details, and the CAMs show that despite what looks like a soaking for everyone in the global models, this will still be an event with winners and losers.
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I wasn't paying attention to the location of that boundary at the time, but it's certainly possible in theory.
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It's really getting its act together on the east side of DC, but that's far too late for those of us further west and northwest.
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I'm pretty shocked by the lack of intensity and lack of lightning.
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Absolutely. The HRRR is capturing the forcing and initiating convection, but because of the extreme issue with low-level drying, it can't possibly generate widespread, intense storms. This is the environment it has the storms moving into: With that low of a surface dew point, it can't possibly show impressive storms, but we all know that the actual dew point will be at least 5 degrees higher.
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I understand questioning the watch, given the dry antecedent conditions, but I don’t understand the comment about most guidance giving us no rain. Toss the HRRR completely, because it’s doing its usual overmixing thing here and drops our dew points into the 50s this afternoon. The rest of the CAMs all have a heavy rain signal *somwhere* in the metro area and suggest a training scenario.
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HRRR again reduces dew points into the upper 50s this afternoon. The fact that it's still able to generate a weak line in that environment certainly suggests that there will be forcing available to work with the "real" instability.
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That midwest derecho won't make it here, but the CAM signal for widespread convection Wednesday in a fairly healthy environment is quite strong in this evening's runs. Would think we should wake up to a Day 2 SLGT in the morning.
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This seems super unlucky. I got 0.35" from this evening's batch.
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For sure. I think that western areas have the best chance of heavy Wednesday evening convection, and areas east have the best chance of the steadier Friday rain. That in-between zone along I-95 could get screwed on both (although we could “win” on either or both too).
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Getting really concerned about trying to get meaningful rainfall this week. It’s still on the table, but it’s far from a sure thing, and lowering model QPF reflects that. It looks like 2 chances: 1) a line of convection on the front Wednesday evening which has potential for big localized totals, but will there be breaks in the line, and might it weaken if it arrives too late? 2) moisture moving from coastal areas back to the northwest Friday. The best rains will be east and southeast of us, but can we still get a modest soaking? Models now still have us within the “good” rain, but we’re getting dangerously close to the back edge, and any further shift east could really screw us. I wouldn’t want to be too far west of DC, as things currently look, for round 2.
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Credit the CAMS which were hinting at a few showers developing along the front after dark. Heavy downpour in the Columbia/Ellicott City area.
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They're dry, but I wouldn't say "suddenly". Things have been trending towards very limited coverage over all runs from the past couple of days. Still some small chance this evening, but I don't see how we generate storms tomorrow with lowering dew points and (light) north winds.
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Several consecutive HRRR cycles show convection, focused mainly northwest of I-95 but with some possibility for those further east in central and northern MD, after dark.
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MRGL for the 4th. There will be convection in the area later in the day, but shear is really meh. Still, with a hot, well-mixed boundary layer, a few stronger wind gusts can't be ruled out. What's interesting is that there is a a weak consensus for this being an event for DC and points south, but there are still a few CAM solutions that get points north of DC in on the action too.
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CAMs have swung back and again look decent for the I-95 corridor, BUT those solutions are contingent upon heating into the 90s. It does look like there is some clearing approaching, and I would expect us to rapidly torch if the sun emerges, but we'll see how this plays out.
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I'm right on the edge and getting massively disappointed. It's worse, because the 00Z CAMs took a huge step in the wrong direction for tomorrow.
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Huge spread in CAM solutions for both today and tomorrow. After looking at the HRRR and NAM Nest, I was ready to write off severe potential this evening and hope for a weakening area of storms to arrive from the northwest later tonight. But all 3 HiRes Windows have significant convective signals for the early evening hours with modest instability and deep-layer shear (and even a bit of low-level shear, if you're really feeling frisky). Do we trust the 2 better models or the agreement of the other 3? For Sunday, being further south and east will ramp up your severe probabilities considerably, but there is still a healthy overall signal for the I-95 corridor in an environment with stronger instability and deep-layer shear than today.
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Of course, right after I blow off Saturday, the 12Z HRRR pulls me back in with an impressive convective evolution for northern MD with some interesting wind profiles.
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Yeah, I'm still worried about this being an Eastern Shore show on Sunday - hoping that the slower trends continue.
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