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October Discussion


TalcottWx

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We are really going to have to get good enough cape to yield mature enough updrafts. The shear is through the roof

timing is awful, let's see how the Nam does with this, it has been blowing up convection 2 days out a lot only to back way down, hi res might be first shot across the bow of that
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timing is awful, let's see how the Nam does with this, it has been blowing up convection 2 days out a lot only to back way down, hi res might be first shot across the bow of that

I don't think timing matters in these setups. The instability is driven by the high dews and in this case we may even have steep lates moving overhead.

What hurts in these setups is that shear is so strong updrafts get sheared apart and aren't able to develop high enough to utilize the shear.

a temp/dew of 70/67 and 700-500 lapse rates of like 6.5 would yield several hundred J of 0-3km cape...at least

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Doesn't timing matter with cape? How much CIN is there? Unless there is super strong mechanical lifting the lack of surface heating will inhibit widespread severe

Having this happen during the day with a chance for hearing certainly would be a positive...no doubt.

However, you don't always need heating to increase cape. In this case temps/dews will be close to 70F so we'll have a warm and veryoist llvl airmass...that alone will yield some instability. Also, if we see steeper lapse rates work in that too would increase cape.

Also, in these setups we are more interested in cape values in the 0-2 or 0-3km level...this is where all the shear/turning is located so you want good cape here...this is where your warm/moist llvl airmass comes into play.

With these systems dynamics really make up for quite a bit and therefore sunlight or heating isn't as important as in the summer b/c you have much stronger forcing and dynamics to compensate.

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Having this happen during the day with a chance for hearing certainly would be a positive...no doubt.

However, you don't always need heating to increase cape. In this case temps/dews will be close to 70F so we'll have a warm and veryoist llvl airmass...that alone will yield some instability. Also, if we see steeper lapse rates work in that too would increase cape.

Also, in these setups we are more interested in cape values in the 0-2 or 0-3km level...this is where all the shear/turning is located so you want good cape here...this is where your warm/moist llvl airmass comes into play.

With these systems dynamics really make up for quite a bit and therefore sunlight or heating isn't as important as in the summer b/c you have much stronger forcing and dynamics to compensate.

Right. We are essentially replacing thermodynamic lifting (more summer-like) with dynamic/synoptic lifting, given that storm systems are much stronger and more baroclinic this time of year.

That being said, with so much dynamics, there is always the worry for convective debris/crapvection.

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day1otlk_1200.gif?1412662676643
Categorical Day1 1200Z Outlook
 
Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area SLIGHT 10,970 17,330,516 New York, NY...Jersey City, NJ...Yonkers, NY...Bridgeport, CT...New Haven, CT...
 Forecast Discussion
   SPC AC 070602   DAY 1 CONVECTIVE OUTLOOK     NWS STORM PREDICTION CENTER NORMAN OK   0102 AM CDT TUE OCT 07 2014   VALID 071200Z - 081200Z   ...THERE IS A SLGT RISK OF SVR TSTMS FROM EASTERN NJ TO SRN NEW   ENGLAND...INCLUDING LONG ISLAND AND THE NYC METRO AREA TUESDAY   NIGHT...    ...DELMARVA/NRN MID-ATLANTIC REGION TO SRN NEW ENGLAND...   POTENTIAL EXISTS FOR STRONG TO SEVERE STORMS ACROSS PARTS OF   DELMARVA...ERN PA...NJ TO SRN NEW ENGLAND...INCLUDING THE NYC METRO   MAINLY DURING THE LAST 6 HOURS OF THE FORECAST PERIOD /06-12Z/.   MODELS ARE CONTINUING TO TREND WITH THE SHORTWAVE TROUGH MOVING   THROUGH THE OH VALLEY TODAY BECOMES NEGATIVELY-TILTED FROM THE   MID-ATLANTIC STATES TO SRN NEW ENGLAND TONIGHT WITH 60-90 METER   HEIGHT FALLS.  INCREASING DEEP LAYER FORCING ACCOMPANYING THIS   SHORTWAVE TROUGH LATE IN THE PERIOD COMBINED WITH LOW-LEVEL   MOISTENING/DESTABILIZATION SUGGESTS TSTM DEVELOPMENT WILL OCCUR FROM   DELMARVA...NRN MID-ATLANTIC REGION TO SRN NEW ENGLAND.  12Z ECMWF   INDICATED MUCAPE IN EXCESS OF 500 J/KG ACROSS THE SLIGHT RISK AREA   BY 06Z.  STRENGTHENING DEEP LAYER SHEAR AND INCREASING LOW-LEVEL   SHEAR ALONG A STRENGTHENING /UP TO 50 KT/ SSWLY LLJ WILL PROVE   FAVORABLE FOR ORGANIZED STORMS.  00Z 4 KM WRF NMM/NSSL RUNS EACH   SUGGEST A QLCS WILL STRENGTHEN/SHARPEN OVER DELMARVA/NJ BETWEEN   06-08Z AND TRACK ACROSS LONG ISLAND TO CT/RI AND PARTS OF MA BETWEEN   08-12Z.     ..PETERS/MOSIER.. 10/07/2014

 

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What a crazy morning run.

 

It started off fall-ish and chilly with temps around 52. Then these pockets of warmer, steamy air started to pool in - especially on south-facing hills - with the chillier air nestled in the low spots. So the rest of the run passed through these alternating air masses. It was like someone was playing with an air conditioner.

 

Ended the run with temps around 62.

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GFS with a nice weenie tropical system along the East Coast next week, lol.  Recurves it out to sea though eventually.

 

It's been so long since we've had anything in the North Atlantic, I can't remember what letter comes next - F?   Didn't we just miss setting a record for timespan between major 'canes, when Edouard(sp?) reached Cat 3 for a few hours?

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Are we still looking at a screaming southeaster for this saturday that some were worried about?

 

 

AWT.

 Pretty much ..Sucks..We knew there was a reason to be worried days ago

 

Ryan Hanrahan ‏

We're going to introduce the chance of rain to the forecast for Saturday morning. Not great news for the marathon.

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