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March 24-25 Winter Storm Threat


Mitchel Volk

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That Euro run was much much improved.

 

It wouldn't take that much of an adjustment to bring meaningful precipitation into the region.

It had that look like it was going to come way north. Much less suppressed though. For a brief moment I thought it was going to make an attempt at a miller A.

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It had that look like it was going to come way north. Much less suppressed though. For a brief moment I thought it was going to make an attempt at a miller A.

I'm pretty confident this makes it far enough north to affect us, unless the blocking gets stronger. This is a healthy, energetic storm that will try for every inch north it can get. The issue then becomes whether this is an intense event where we can get real accumulations or if it's more of a sheared mess kind of event where it doesn't accumulate unless well inland and with elevation.

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It would be nice if we could have a pure miller A, no major screwjobs with those, and a classic intensification pattern and CCB.

Of course in late March, surface temps are a huge factor as well as the timing.

 

We need a much improved PNA for that to even become a remote possibility. 

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Upton

 

"THE TELECONNECTION OF SHARP POSITIVE CHANGE WITH RESPECT TO TIME OF THE AO AND NAO GOING TOWARDS LESS NEGATIVE VALUES AND POSITIVE PNA RELATE TO THE CYCLOGENESIS POTENTIAL. SO IT IS POSSIBLE FUTURE MODEL TRACKS COULD BE MORE NORTHERLY FOR SOME MODELS THAT KEEP AREA DRY EARLY NEXT WEEK...INCREASING THE PRECIPITATION POTENTIAL IN SUBSEQUENT FORECASTS AND COLDER AS WELL IF THE LOW TRENDS STRONGER. THAT WOULD BE MEAN A GREATER FRACTION OF THE REGION GETTING SNOW."
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There was a very subtle shift in the 50/50 low 12z compared to 0z a little further east which

reduced the confluence over New England on the Euro. Some incremental improvement

in later runs would allow the main precipitation shield to shift north from Southern NJ

and the Delmarva regions. The jet exit region near the MA would support a low bombing

out once it gets to the coast.

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The  control run of the Euro is great .However  Its making the same mistake it made with its precip field back  days before the  March 8th storm .

It pulls its precip  towards its center like you would see in hurricane , and thats wrong .

 

With a SLP coming off NC and deepening to 992 just east of the Delmarva and still moving ENE  the precip shield should be more expansive than whats shown  .

QPF  is one of the hardest equations to solve for a model and usually becomes clearer as you get closer .

 

Focus on the track and not the QPF 5 days out . 

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Excellent point & accurate reminder of the 8th, the Euro and if I remember correctly GFS consistently painted the precp shield to the east of the low center with nada to the west

The  control run of the Euro is great .However  Its making the same mistake it made with its precip field back  days before the  March 8th storm .

It pulls its precip  towards its center like you would see in hurricane , and thats wrong .

 

With a SLP coming off NC and deepening to 992 just east of the Delmarva and still moving ENE  the precip shield should be more expansive than whats shown  .

QPF  is one of the hardest equations to solve for a model and usually becomes clearer as you get closer .

 

Focus on the track and not the QPF 5 days out . 

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