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cold pool hailers 7/1/2015?


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The 6z NAM doesn't too bad for for Northern CT and Western Mass. By 21z Wed, MLCAPE is up to 1500 J/kg, LI between -5 and -6 and 30-35kts of bulk shear. This is before the cold front arrives.

 

mlcape0639.gif

 

The 6z GFS has better mid-level lapse rates and more SBCAPE at 18z Wed. Though, you will have to watchout for morning junk. Also for the best LLJ and moisture to shift east later in the afternoon. I wouldn't expect more than isolated strong-severe, at this time.

06_GFS_036_KBDL_skewt_SB.gif

 

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The 00z KFS was an unmitigated disaster :weenie:

 

I thought tomorrow looked kind of interesting. Timing and clusters may be a pain to figure out, but good negative tilted trough moving in, colder air at 500 along with stronger winds at this level approaching. For once, may have some synoptic forcing to help out. 

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It all comes thru in morning. And it's SNE

 

It can happen...I remember waking up one morning to the sound of hail as a line of thunderstorms popped up seemingly out of no where and that was at 8am.  Ended up with nickel size hail, not alot of rain and not alot of thunder, but good hail.

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The only time I remember getting lucky with one of these setups was a few years ago when I lived in Ellington just up the hill from the Ellington Golf Center. A nice discrete cell popped near Windsor Locks and took a diagonal for Ellington, throwing down 60 mile per hour winds and some quarter sized hail. At the time, I had family members in Windsor Locks, East Windsor, and myself and we all lost power.

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What does E Pa this afternoon have to do with a round of 8:00 am showers in SNE tomorrow?

come on man ,you know that weather forecasting is also looking at upstream data and convection and seeing how boundaries and windfields evolve and not just looking at the models. That was a meteorologist that put up that post, not just any Joe Schmo

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come on man ,you know that weather forecasting is also looking at upstream data and convection and seeing how boundaries and windfields evolve and not just looking at the models. That was a meteorologist that put up that post, not just any Joe Schmo

 

That's where our round of 8 am showers is coming from isn't it.......

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SPC 1730z outlook

..NERN U.S...

THIS OUTLOOK ISSUANCE MAINTAINS A MARGINAL SEVERE WEATHER RISK

ACROSS PARTS OF THE NORTHEAST STATES...THOUGH PORTIONS OF SOUTHERN

NEW ENGLAND COULD HAVE HIGHER SEVERE PROBABILITIES INTRODUCED IN

SUBSEQUENT OUTLOOKS IF CONFIDENCE IN DESTABILIZATION INCREASES FOR

THAT REGION. LARGE-SCALE ASCENT IS EXPECTED AHEAD OF A PROGRESSIVE

SHORTWAVE TROUGH EXPECTED TO TRANSLATE INTO THE NRN MID-ATLANTIC

REGION AND HUDSON VALLEY BY 18Z...THEN INTO ERN NEW ENGLAND BY

SUNSET. THIS ASCENT COMBINED WITH STEEPENING LOW-LEVEL LAPSE RATES

SHOULD SUPPORT SCATTERED TSTMS WITHIN A WARM SECTOR FORECAST TO

DEVELOP ACROSS SRN NEW ENGLAND BY EARLY AFTERNOON. DEGREE OF

DESTABILIZATION REMAINS A LIMITING FACTOR FOR HIGHER SEVERE

PROBABILITIES AS PRECIPITATION/CLOUDINESS WILL LIKELY BE LOCATED

ACROSS SRN NEW ENGLAND AT THE START OF DAY 2. SHEAR PROFILES ARE

EXPECTED TO SUPPORT ORGANIZED UPDRAFTS...WITH EVEN MUCAPE OF

500-1000 J/KG SUGGESTING ISOLATED COVERAGE OF STRONG TO SEVERE

STORMS INTO THE AFTERNOON. ROBUST CONVECTION COULD SPREAD INTO THE

REST OF WRN NEW ENGLAND BY EARLY AFTERNOON...WITH LOCALLY DAMAGING

WINDS BEING THE PRIMARY SEVERE WEATHER THREAT. HOWEVER...A TORNADO

OR TWO CANNOT BE RULED OUT...AS CURVED LOW-LEVEL HODOGRAPHS COULD

SUPPORT THIS SEVERE HAZARD TOO.

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SPC 1730z outlook

..NERN U.S...
   THIS OUTLOOK ISSUANCE MAINTAINS A MARGINAL SEVERE WEATHER RISK
   ACROSS PARTS OF THE NORTHEAST STATES...THOUGH PORTIONS OF SOUTHERN
   NEW ENGLAND COULD HAVE HIGHER SEVERE PROBABILITIES INTRODUCED IN
   SUBSEQUENT OUTLOOKS IF CONFIDENCE IN DESTABILIZATION INCREASES FOR
   THAT REGION.  LARGE-SCALE ASCENT IS EXPECTED AHEAD OF A PROGRESSIVE
   SHORTWAVE TROUGH EXPECTED TO TRANSLATE INTO THE NRN MID-ATLANTIC
   REGION AND HUDSON VALLEY BY 18Z...THEN INTO ERN NEW ENGLAND BY
   SUNSET.  THIS ASCENT COMBINED WITH STEEPENING LOW-LEVEL LAPSE RATES
   SHOULD SUPPORT SCATTERED TSTMS WITHIN A WARM SECTOR FORECAST TO
   DEVELOP ACROSS SRN NEW ENGLAND BY EARLY AFTERNOON.  DEGREE OF
   DESTABILIZATION REMAINS A LIMITING FACTOR FOR HIGHER SEVERE
   PROBABILITIES AS PRECIPITATION/CLOUDINESS WILL LIKELY BE LOCATED
   ACROSS SRN NEW ENGLAND AT THE START OF DAY 2.  SHEAR PROFILES ARE
   EXPECTED TO SUPPORT ORGANIZED UPDRAFTS...WITH EVEN MUCAPE OF
   500-1000 J/KG SUGGESTING ISOLATED COVERAGE OF STRONG TO SEVERE
   STORMS INTO THE AFTERNOON.  ROBUST CONVECTION COULD SPREAD INTO THE
   REST OF WRN NEW ENGLAND BY EARLY AFTERNOON...WITH LOCALLY DAMAGING
   WINDS BEING THE PRIMARY SEVERE WEATHER THREAT.  HOWEVER...A TORNADO
   OR TWO CANNOT BE RULED OUT...AS CURVED LOW-LEVEL HODOGRAPHS COULD
   SUPPORT THIS SEVERE HAZARD TOO.

The more sun the more fun.

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The more sun the more fun.

 

A couple negatives. One... the s/w passes by 15z so we're left with negative vorticity advection and rising heights in the afternoon. This could be a problem.

 

Also - quite a bit of dry air filters in aloft - could choke things off.

 

The one thing to watch though is there's still plenty of wind shear around so we will have to watch to see how things develop. 

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I remain interested.

 

SREF progs are still a sneaky threat, and SPC WRF shows several rounds possible. Definitely a morning band of showers/storms, but the early afternoon round looks like the most robust. Finally a third round looks like they will pop along the actual trough axis late in the day.

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I remain interested.

 

SREF progs are still a sneaky threat, and SPC WRF shows several rounds possible. Definitely a morning band of showers/storms, but the early afternoon round looks like the most robust. Finally a third round looks like they will pop along the actual trough axis late in the day.

 

:weenie: :weenie:

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:weenie: :weenie:

 

Another event finds GYX on the wrong side of the boundary. Looks like it will be a pseudo warm front laying NW to SE across the region. Residence time on the boundary should be pretty short for any cells, given the forecast motion to the NE, but current CAM forecasts aren't the worst I've ever seen.

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A couple negatives. One... the s/w passes by 15z so we're left with negative vorticity advection and rising heights in the afternoon. This could be a problem.

 

Also - quite a bit of dry air filters in aloft - could choke things off.

 

The one thing to watch though is there's still plenty of wind shear around so we will have to watch to see how things develop. 

 

I agree.

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