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Remarkably, the slower NAM timing yesterday seems like it’s going to be correct, and that hurts the setup here.
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Besides the overall NAM Nest struggles this summer that you've documented, this looks to be a classic case of the NAM being too slow with the system, causing it to arrive at a very unfavorable time. Its timing is a clear outlier for now.
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Morning CAMs suggest a heavy rainfall threat Saturday evening (timing unsurprisingly still somewhat in doubt). Good signal for convection spreading east ahead of a shortwave into an axis of very high PWs and some instability.
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I was really surprised when this popped up on my Radarscope. The HRRR hates this event, and while WPC talked up the 850 mb confluence, it seems kind of subtle to me. That said, the RRFS likes it to some extent, as did some of the cams earlier today, and storms are indeed firing across central PA. I'll be surprised if anything makes it southwest of Baltimore, but it's worth monitoring for a while this evening.
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2026 Mid-Atlantic Severe Storm General Discussion
high risk replied to Kmlwx's topic in Mid Atlantic
It’s actually more likely the storms firing out ahead over northeast Ohio. That would be better, because we want these storms to arrive as early as possible.- 2,562 replies
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2026 Mid-Atlantic Severe Storm General Discussion
high risk replied to Kmlwx's topic in Mid Atlantic
The front is slower than had been shown, so the updated Day2 has expanded the SLGT back to the north. Still tons of CAM disagreement (of course).- 2,562 replies
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2026 Mid-Atlantic Severe Storm General Discussion
high risk replied to Kmlwx's topic in Mid Atlantic
Sorry. Bad wording on my part. The southeast PA reference was regarding where the complex heads as it moves out of western PA.- 2,562 replies
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2026 Mid-Atlantic Severe Storm General Discussion
high risk replied to Kmlwx's topic in Mid Atlantic
There seems to be growing consensus that an intense MCS will form over northeast OH and western PA late this afternoon and move southeast. While it (shocker) appears that the best threat will be over southeast PA, at least some of the complex should make it into northern MD and potentially into the Baltimore-Washington corridor later this evening or overnight.- 2,562 replies
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2026 Mid-Atlantic Severe Storm General Discussion
high risk replied to Kmlwx's topic in Mid Atlantic
Certainly sounds like SPC is going to issue a new box over us soon.- 2,562 replies
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2026 Mid-Atlantic Severe Storm General Discussion
high risk replied to Kmlwx's topic in Mid Atlantic
Hard not to think that this cluster will persist south of the M-D line, although instability isn't what it could have been, given that the eastern half of the area has easterly winds behind that weak backdoor front.- 2,562 replies
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2026 Mid-Atlantic Severe Storm General Discussion
high risk replied to Kmlwx's topic in Mid Atlantic
I personally don't look at it very often, as it's still being tweaked. That said, it's the future, so as it matures, I'll definitely be looking more often.- 2,562 replies
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2026 Mid-Atlantic Severe Storm General Discussion
high risk replied to Kmlwx's topic in Mid Atlantic
Correct. HRRR, NAM Nest, RRFS, and the three Hires Windows (FV3, ARW, ARW2).- 2,562 replies
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2026 Mid-Atlantic Severe Storm General Discussion
high risk replied to Kmlwx's topic in Mid Atlantic
Even this evening has a lot of questions. While there is general agreement that a cluster of storms drops south through NJ/DE, some of the CAMs have storms building back to the west and catching much of central MD.- 2,562 replies
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2026 Mid-Atlantic Severe Storm General Discussion
high risk replied to Kmlwx's topic in Mid Atlantic
One complication for tomorrow is that some of the guidance pushes a front from the northeast through the area later tonight. If that pushes well to our southwest like shown in the NAM Nest, we'll be cooler and more stable, at least on the Maryland side. Less aggressive guidance puts the boundary somewhere between DC and Baltimore and has it retreat later in the day. This would in theory be a focus for afternoon convection.- 2,562 replies
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2026 Mid-Atlantic Severe Storm General Discussion
high risk replied to Kmlwx's topic in Mid Atlantic
I'd say that there isn't much doubt about it, especially in the East. We've had several derechos over the year die an ugly death over the mountains to our west when no EML was in place downstream. One event in 2000 led SPC to issue a rare PDS severe thunderstorm watch here due to an intense bow echo over southeast Ohio blasting east. Our environment did not have an EML, and the Appalachians shredded the system - we ended up with line of showers featuring gusts to 30 kt.- 2,562 replies
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