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April 25-28 rolling warmth/severe weather/convection thread


earthlight

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well, no one was on the board so he didn't have an audience for his flood and disaster posts. Surprised we didn't wake up to a post by him of how he had to rescue a cat from a tree that was displaced when it was scared of the thunder and the 2 second shower.

:lmao::unsure::thumbsup:

Since most of northern NJ is under either a flood watch or flash flood watch should I post evacuation details now or is it too soon???????:guitar:

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No triggers and once again you will be fighting the late day marine layer.

yup. Tomorrow will obviously be the day for any chance at thunderstorms. We have the moisture with the high dewpoints, we will have the instability, however no lift. Without that lift, no convection is likely.

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yup. Tomorrow will obviously be the day for any chance at thunderstorms. We have the moisture with the high dewpoints, we will have the instability, however no lift. Without that lift, no convection is likely.

I got thunderstorms last night. I do realize that the line was rapidly decaying once it crossed over into NJ but it was enough to put my back yard under a severe thunderstorm warning late last night.

Once again expectations are low. The 12z NAM has almost a repeat performance compared to last night so we shall see what happens :popcorn:

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No triggers and once again you will be fighting the late day marine layer.

Just like yesterday, an h5 cold pocket (-12c to -13c) over the Appalachians will be the trigger. This is represented well by the -4 to -5 LI currently over the area and a solid 7c/km mid level lapse rate. SREF guidance tracks this over the Mid Atlantic with moderate instability and decent directional shear. I would like to see more breaks in the low level clouds though before I get excited. However, these may aid in setting up local boundaries east of the Appalachians that could act is low level triggers. All of this can overcome the lack of a surface front today because the cap isn't as strong as the last two days. This threat is highest across VA, MD, C-E PA and W NJ.

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Just like yesterday, an h5 cold pocket (-12c to -13c) over the Appalachians will be the trigger. This is represented well by the -4 to -5 LI currently over the area and a solid 7c/km mid level lapse rate. SREF guidance tracks this over the Mid Atlantic with moderate instability and decent directional shear. I would like to see more breaks in the low level clouds though before I get excited. However, these may aid in setting up local boundaries east of the Appalachians that could act is low level triggers. All of this can overcome the lack of a surface front today because the cap isn't as strong as the last two days. This threat is highest across VA, MD, C-E PA and W NJ.

Thanks for the info! Hopefulyl something pops.

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Just like yesterday, an h5 cold pocket (-12c to -13c) over the Appalachians will be the trigger. This is represented well by the -4 to -5 LI currently over the area and a solid 7c/km mid level lapse rate. SREF guidance tracks this over the Mid Atlantic with moderate instability and decent directional shear. I would like to see more breaks in the low level clouds though before I get excited. However, these may aid in setting up local boundaries east of the Appalachians that could act is low level triggers. All of this can overcome the lack of a surface front today because the cap isn't as strong as the last two days. This threat is highest across VA, MD, C-E PA and W NJ.

I've been interested in something trying to develop along the seabreeze front later today as well. With the cold pool aloft, we really just need some boundary layer heating. It's looking good now with some breaks in the clouds near the shore.

With the southeast component to the wind we should see a seabreeze developing near/around 1-3pm...and it wouldn't at all surprise me to see convection go up along seabreeze fronts this afternoon. We will see..

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I've been interested in something trying to develop along the seabreeze front later today as well. With the cold pool aloft, we really just need some boundary layer heating. It's looking good now with some breaks in the clouds near the shore.

With the southeast component to the wind we should see a seabreeze developing near/around 1-3pm...and it wouldn't at all surprise me to see convection go up along seabreeze fronts this afternoon. We will see..

Agreed. We already see convection firing up in DE and S NJ along the stability gradient in place. The directional shear, moisture and LCL heights are pretty impressive for this area if we can manage to get the MLCAPE. Obviously this is no "AL/MS 45% tornado prob" type of impressive but still... lol

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Agreed. We already see convection firing up in DE and S NJ along the stability gradient in place. The directional shear, moisture and LCL heights are pretty impressive for this area if we can manage to get the MLCAPE. Obviously this is no "AL/MS 45% tornado prob" type of impressive but still... lol

Yup...what worries me though is the potential for lots of little storms/convection to develop early and screw things up...given the moisture/etc in place.

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Yup...what worries me though is the potential for lots of little storms/convection to develop early and screw things up...given the moisture/etc in place.

There is a bit of a warm pocket over E PA and N NJ which hopefully keeps things capped. The latest 17z update has a -7.5c/km mid level lapse rate now. This cold pocket is legit. :thumbsup:

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Those cells down south will be moving into an enviornment which is already low to moderatly unstable. The low and mid-level lapse rates are not particullary strong but shear is increasing

Those cells are absolute trash. Our mid level lapse rates will increase 21z on once this cold pocket moves overhead.

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