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Week of June 10th Heavy Rain and Thunderstorms Discussion


IsentropicLift

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This almost reminds me of model waffling with winter storm tracks when Gulf convection is involved.

We just don't have much experience with deep June lows forming in conjunction with a MCS on a High

Risk severe day. 

Yea, great analogy. With these supercells it is proably even 2-3x harder on the models.

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The GFS is notorious for overdoing sfc dewpoints, which thus lead to too high of SB CAPE values. On a cloudier/cooler day, more moisture inherently leads to more CAPE, and of course, right on the boundary, it's cloudier and cooler than just south. Thus, I think the GFS is too strong and too far north with its instability axis.

That being said, the very far south solutions appear unlikely. I think the 18z RGEM and NAM have the right idea, placing the WF somewhere in C NJ. This firmly entrenches S NJ in the warm sector for discrete cells, and C NJ is on the fringe, but could also cash in -- certainly more uncertainty there.

I still think the NYC area is too far north.

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I also think the GFS may be way underdone with rain amounts in the cool sector. Would you agree?

The GFS is notorious for overdoing sfc dewpoints, which thus lead to too high of SB CAPE values. On a cloudier/cooler day, more moisture inherently leads to more CAPE, and of course, right on the boundary, it's cloudier and cooler than just south. Thus, I think the GFS is too strong and too far north with its instability axis. That being said, the very far south solutions appear unlikely. I think the 18z RGEM and NAM have the right idea, placing the WF somewhere in C NJ. This firmly entrenches S NJ in the warm sector for discrete cells, and C NJ is on the fringe, but could also cash in -- certainly more uncertainty there. I still think the NYC area is too far north.

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NYC is at 7.96" for the month ( rainfall wise ). The record is 10.27" which was set in 2003.

It would take a miracle for that not to be broken...even if tomorrow busts horribly, there's still 17 days left in the month to get 2.25 inches of rain...

BDR is a bit tougher--have to get to 17 due to the rains from Agnes in '72

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There is still the whole backside of the storm after 27

I think that's fairly questionable. There probably won't be a massive comma head like you would expect in the winter. Looks like most of the steady rain will stay north of most of us after an initial round in the morning. The heaviest rain looks to be in the I-90 corridor.

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take a look at the upper levels and explain why there wont be a comma head, or at least a semblence of one.  To me, you have to rule out the month and look at the raw data and backside rain is a distinct possibility.

I think that's fairly questionable. There probably won't be a massive comma head like you would expect in the winter. Looks like most of the steady rain will stay north of most of us after an initial round in the morning. The heaviest rain looks to be in the I-90 corridor.

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I think that's fairly questionable. There probably won't be a massive comma head like you would expect in the winter. Looks like most of the steady rain will stay north of most of us after an initial round in the morning. The heaviest rain looks to be in the I-90 corridor.

 

The heavy stuff is gonna reach alot further south than the I-90 corridor.. 

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