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About high risk
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Four Letter Airport Code For Weather Obs (Such as KDCA)
KBWI
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Location:
North Laurel, MD
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Initiation ahead of schedule in the local area. Expecting an MD from SPC soon.
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Yeah, the HRRR develops storms in that general vicinity. NAM Nest develops convection over northern VA
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They evolve differently, but the HRRR and NAM Nest both like the I-95 corridor in MD around or just after sunset.
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If today happens, it's going to be a late show.
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As others have alluded to, the lower dew points yesterday probably led to so much downdraft cape that the damaging winds superseded the heavy rainfall threat. With higher dews today, the HRRR in particular suggests a greater heavy rain threat, although it delays initiation later than several other cams.
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2026 Mid-Atlantic Severe Storm General Discussion
high risk replied to Kmlwx's topic in Mid Atlantic
Impressive number of reports today in the Mid-Atlantic, but a noticeable hole over northern Virginia.- 969 replies
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Yeah, I have doubts too, but we need to let this play out. Some initiation now in Montgomery County. Outflow boundaries could explode in this environment.
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WPC heavy rainfall discussion suggests that experimental WoFS guidance really lights up the 95 corridor over the next few hours.
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If we're not going to use the severe thread, we should rename this thread to include the storm threat.
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2026 Mid-Atlantic Severe Storm General Discussion
high risk replied to Kmlwx's topic in Mid Atlantic
Dew points have legitimately crashed. That doesn’t seem to be hindering storm development to the west, and irs probably increasing the wind threat (with larger downdraft cape), but it *might* limit coverage a bit.- 969 replies
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2026 Mid-Atlantic Severe Storm General Discussion
high risk replied to Kmlwx's topic in Mid Atlantic
The lower dew points give me pause for sure, but I feel better seeing that even the HRRR, which overmixes the crap out of our area this afternoon, initiates a modest coverage of storms locally.- 969 replies
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2026 Mid-Atlantic Severe Storm General Discussion
high risk replied to Kmlwx's topic in Mid Atlantic
Wasn't expecting the box to come that far south, but as noted above, there is at least some cam support for it. Also, RRFS going operational is delayed until October.- 969 replies
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2026 Mid-Atlantic Severe Storm General Discussion
high risk replied to Kmlwx's topic in Mid Atlantic
While Friday is indeed capped with no real trigger, there are a couple of CAMs that have a complex of storms dropping south out of PA during the early evening and initiating new storms in our area on the outflow. That said, I'm certainly on board with the prevailing idea of better chances of storms Saturday-Monday with severe and flash flood threats.- 969 replies
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Would be really nice to be able to lock in a heavy precip event, but there is just too much uncertainty with position of the front, timing of waves, and overall strength of the system. My dream heavy rain scenario is convection along (or just behind) the front later Friday, overrunning showers and storms Friday night, and more elevated convection Saturday with the front hanging around and a shortwave.
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Nope. The ongoing stratiform rain over us is what I was calling "round 2", and the HRRR seems to have a very good handle on this. After this ends soon, I think we have to wait until tomorrow morning.

