MikeB_01

For tomorrow from the SPC

...Appalachians/Upper Ohio River Valley and Mid-Atlantic States...
   Widespread convection within a moderately sheared environment will
   create the potential for a relatively active severe weather day
   across portions of the Appalachians/OH River Valley into the
   Mid-Atlantic, but poor midlevel lapse rates and the impact of early
   day precipitation/clouds on destabilization may tend to mitigate
   this threat to some extent. The severe threat should begin to evolve
   by late morning/early afternoon, as midlevel flow and effective
   shear gradually increase and pockets of heating/destabilization
   develop in the wake of early morning convection. Thunderstorm
   redevelopment is expected along the cold front pushing into western
   PA, and also across the higher terrain of the central/northern
   Appalachians. Effective shear of 30-40 kt will be sufficient for
   organized multicell clusters and perhaps a few supercells. Corridors
   of locally damaging wind are likely to be the primary threat, but a
   couple of tornadoes are also possible, especially with any supercell
   that interacts with differential heating boundaries that may evolve
   through the day. 

I’m in Bellevue, and can’t figure why I have a severe thubderstorm warning. 

I think we may have had one of those “wet downburst” in Bellevue/westview this morning. A ton of tree damage and big limbs down. Very localized, but damage was extremely impressive. 

These torrential flash floods and mud slides are getting worse than winter in terms of having to check what roads I can use to get to work each morning... Luckily for me I've either passed before or after so no major impact.
We were in the pool yesterday and all of the sudden a blast of cool air dropped the temperatures and within 5-10 minutes all hell broke lose. Nice example of gust front induced storms.

13 minutes ago, CoraopolisWx said:

Interesting setup this evening, with an initial line pushing SE, but then more storms quickly redeveloping to the west moving ENE.

Not suprised with the flash flood warnings

 

Im always so fascinated and yet so confused with storms like tonight. I never understand the dynamics that cause the complex movements of thunderstorms like tonight.

Also some flooding in Lebo. Cedar blvd, right in front of the entrance to the park is under water. One car was stuck in there about an hour ago

About the same where I was at, but I was near Wal-Mart at the time. Of course, the radar showed a nice blotch of red go right over my apartment, but I wasn't there at the time to witness it.

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Boy this line of thunderstorms "dry slotted" me. Barely any rain, and lightning and thunder North an south. 

Yeah, it's getting dark rather quick here. Lots of lightning and thunder. The heaviest of it could dip just south of me but it's close.

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1 hour ago, CoraopolisWx said:

After being on the NW edge of the severe weather last week, now we're on the SE edge. Lol

Although on the positive side, we tend to get better cell development with these type setups.

Not feeling too optimistic about the storms making it to us intact. Satellite imagry showing that the storms are having a hard time maintaining after they form. CAPE looks decent, but the aloft winds are pretty weak. I'm hoping to get some good thunder later tonight, but not holding my breath.

8 minutes ago, CoraopolisWx said:

I had just driven through there around 6:30, crazy stuff.

Can't find anything on twitter warning folks about the flooding. Very disappointing.

NWS Pit has 8 tweets over the last hour talking about the rain in the south hills. They also retweeted the Allegheny County handle. Maybe could have done a little more, but i think thats a pretty good showing. 

3 minutes ago, CoraopolisWx said:

The 511PA traffic cams showing flooding on Saw Mill Run.

The water is almost as high as the jersey barriers near Bausman. 

Just took a peak at that cam. It does a live stream from it as well.. Crazy high water down there right now. Stay away if you can

4 minutes ago, CoraopolisWx said:

The latest AFD from the NWS mentioned a weak short wave moving through this evening.

Because of the limited instibility, they felt the heavy rain would be isolated.

I'm just amazed that all of a sudden the cells popped up on what looked like a line and then stayed stationary. Crazy stuff. Areas south of downtown received 2+ in of rain in an hour based on radar.

Anyone smart enough to figure out what was the trigger this evening to cause those storms to go up?

I’m on the outside part of that cell. It’s been raining for almost an hour and my gauge has almost a half an inch in it.


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The cell that just appeared over AGC is dumping rain. And it’s not moving.


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This incoming line is really losing its punch. Just some weak showers to roll through I think. Even the back end of the rain is shrinking. On radar it looks like it is racing to catch the leading edge.

7 minutes ago, KPITSnow said:

Surprisingly almost no lightning with those heavy showers west of the city, though the atmosphere probably was stabilized by the initial rain and it now being cloudy. 

 

It seems that that every day the severe storms have started to form directly over us then ramped up to our south and east. 

 

We we will probably see the watch canceled over our area in the next hour or two. 

I noticed that as well. Do you think topographic enhancement had anything to do with it? Needing the mountains to get things going?

https://lmaps.org/#-80.59;40.18;9

In case anyone wants to watch the lightning strikes. Seems like a cool website.

18 minutes ago, TeaysValleyWV said:

Individual cells look like they are really ramping up in last 30 minutes

That warned cell in Washington county looks nasty. Could be some decent hail stones in there.

Enhanced risk for tomorrow.

A little windy here, but the main part of the squall pasted to my north


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Nice squall line starting to form. Meso Discussion is mentioning the impressive lapse rates coming out of Ohio and into Western PA. Should allow for some nice wind to mix down to the surface with the squall line.

8 hours ago, Rd9108 said:

This image haunts me

 

I remember this storm. Fortunately, I go much higher numbers than this. But i know some people in our thread got 2ft+

2 hours ago, blackngoldrules said:

All we can do is laugh at this point. Like being a Browns fan. Lol

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Unfortunately, I fall into both of those categories...