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Week of June 10th Heavy Rain and Thunderstorms Discussion


IsentropicLift

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On the 18z NAM the warm front clears the area right as the rest of the activity is ariving from the west. I don't think the rain stops north of Philly.

 

The low still weakens as it approaches the coast

 

The rain on the 18z NAM would begin early tomorrow between 06-09z and end very early Friday around 06z. About a 24 hour event.

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The 18z GFS is almost 12-15 hours faster than the 18z NAM as well.

 

The GFS has the low near ACY at 00z Friday while the NAM has the low back near DC at the same hour and doesn't reach ACY until about 4-5z Friday. Then the NAM is very slow to move out while the GFS hauls ass eastward.

 

The NAM slows down and begins a phase right as the low reaches the coast while the GFS is south of the twin forks by then.

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The 18z GFS is almost 12-15 hours faster than the 18z NAM as well.

 

The GFS has the low near ACY at 00z Friday while the NAM has the low back near DC at the same hour and doesn't reach ACY until about 4-5z Friday. Then the NAM is very slow to move out while the GFS hauls ass eastward.

 

The NAM slows down and begins a phase right as the low reaches the coast while the GFS is south of the twin forks by then.

It is also significantly more north (for 24 out)  than 12z and 3-4 mb stronger

- Its as if, in the morning with less storms, the 12z suit weakend the whole system, but with the new afternoon convertion they now see it as being more amped.

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I was thinking the same thing. The models wont have to predict where, and how many storms will pop up today anymore.

 

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. 

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