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General Thunderstorm Discussion: Late June


Quincy

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We haven't had much in the way of severe thunderstorm recently and although we may have to wait until the middle of next week for another legitimate threat, we may still see some thunderstorm opportunities before then.

 

The computer models indicate a slight risk for isolated thunder both this afternoon and tomorrow. There isn't much of a trigger, but with warmer temperatures and gradually increasing dew-points, some instability will try to work in. I think the risk today and tomorrow is relatively low and is focused on inland areas. Here the higher resolution models and even GFS grid data indicate some localized convective activity.

 

Sunday could feature a few storms, but I'm not particularly excited by the potential there. The second half of Tuesday could be a different story if we can get the timing of a few players just right.

 

This thread will help differentiate between generic discussions and banter, specifically to thunderstorm threats.

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GFS and Euro hinting at something next Saturday with a cold front sweeping through. Location is key and if we can warm sector that would be great.

 

Yeah next Saturday certainly has some interest.  Right now the GFS and Euro have a pretty strong area of low pressure moving through southeastern Canada and with a strong high pressure just off the coast there will be an axis of very strong winds aloft, however, there appears to be somewhat of a disconnect between the stronger lower tropospheric winds and stronger winds aloft.  Also looks perhaps there could be two cold fronts that move through with the secondary front the stronger of the two...the stronger llvl winds associated with the initial front.  Anyways, being a week out so much is going to change so not even worth it to nitpick over such small details right now.  

 

It's a shame though we can't get stronger shear for Wednesday...Wednesday will have some moderate to extreme instability across the region.  The GFS actually though does break off a piece of stronger westerlies aloft and moves them through the region, likely associated with a piece of s/w energy moving through aloft...so do have to keep an eye on this and the strength of the s/w.  Also a stronger area of UL winds to the north of us which could offer some support.  

 

Nothing excitingly immanent as of now but certainly some potential on the horizon.   

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Areas north of the Pike have a relatively better chance tomorrow (well today technically), but really anywhere in northern New England has the best chance, if any chance at all. MOS is putting 20-25% chance of t-storms for areas in NH and VT, which isn't even saying much.

The spc wrf had some storms up north for today.

 

Also for the D2, this sounds like a setup for frustration.  :>

 

 

...NERN U.S...

UPPER RIDGING WILL FAVOR MOISTURE RETURN ACROSS THE OH VALLEY/MIDDLE

ATLANTIC INTO UPSTATE NY/NRN NEW ENGLAND DURING THE DAY2 PERIOD.

WITH INSTABILITY EXPECTED TO INCREASE THERE IS REASON TO BELIEVE A

FEW TSTMS COULD DEVELOP DURING THE HEAT OF THE DAY DESPITE THE LACK

OF ANY IDENTIFIABLE DISTURBANCE OR SHORT-WAVE TROUGH. LATEST

GUIDANCE SUGGESTS A ZONE OF WEAK LOW LEVEL CONFLUENCE ACROSS THE

HUDSON VALLEY INTO SRN QB MAY PROVIDE THE FOCUS FOR CONVECTION.

WEAK DEEP LAYER SHEAR SUGGESTS GUSTY WINDS OR PERHAPS MARGINALLY

SEVERE HAIL IS POSSIBLE. THIS ACTIVITY WILL BE DIURNALLY DRIVEN AND

WEAKEN WITH LOSS OF DAYTIME HEATING.

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The spc wrf had some storms up north for today.

 

Also for the D2, this sounds like a setup for frustration.  :>

 

 

...NERN U.S...

UPPER RIDGING WILL FAVOR MOISTURE RETURN ACROSS THE OH VALLEY/MIDDLE

ATLANTIC INTO UPSTATE NY/NRN NEW ENGLAND DURING THE DAY2 PERIOD.

WITH INSTABILITY EXPECTED TO INCREASE THERE IS REASON TO BELIEVE A

FEW TSTMS COULD DEVELOP DURING THE HEAT OF THE DAY DESPITE THE LACK

OF ANY IDENTIFIABLE DISTURBANCE OR SHORT-WAVE TROUGH. LATEST

GUIDANCE SUGGESTS A ZONE OF WEAK LOW LEVEL CONFLUENCE ACROSS THE

HUDSON VALLEY INTO SRN QB MAY PROVIDE THE FOCUS FOR CONVECTION.

WEAK DEEP LAYER SHEAR SUGGESTS GUSTY WINDS OR PERHAPS MARGINALLY

SEVERE HAIL IS POSSIBLE. THIS ACTIVITY WILL BE DIURNALLY DRIVEN AND

WEAKEN WITH LOSS OF DAYTIME HEATING.

Yeah we'll see what happens. I also looked at the SPC WRF as well. NH looks more favorable 16Z-20Z but I'd go with the latter end of that time period to see something.

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Nice D3 for NNE

 

 

...NERN U.S...

DEEP WNWLY FLOW WILL TRANSPORT STEEPER LAPSE RATE ENVIRONMENT ACROSS
SRN CANADA INTO NRN NEW ENGLAND DURING THE DAY3 PERIOD. STRONG
BOUNDARY LAYER HEATING MAY ALLOW TEMPERATURES TO RISE INTO THE 80S
WHICH WILL BE MORE THAN ADEQUATE FOR CONVECTIVE DEVELOPMENT. SBCAPE
ON THE ORDER OF 2000 J/KG COULD EVOLVE ACROSS THIS REGION ALONG SRN
FRINGE OF STRONGER FLOW IN ASSOCIATION WITH QB SHORT-WAVE TROUGH.
FORECAST SFC-6KM BULK SHEAR WOULD SUPPORT DEEP ROTATION BUT WITH
DEEP WLY FLOW IT APPEARS DAMAGING WINDS AND HAIL ARE THE PRIMARY
SEVERE THREATS.

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Looks like a big day for SNE tomorrow

 

:lol: Now you aren't even trying.  This screams big day for SNE...

 

 

.SHORT TERM /6 AM MONDAY MORNING THROUGH MONDAY NIGHT/...

MONDAY...

MID LEVEL RIDGE ERODES SOMEWHAT AS MID LEVEL TROUGH OVER THE

TN/OH VLY LIFTS NORTHEAST INTO PA/NY. MODEST MID LEVEL COOLING

WITH 500 MB TEMPS COOLING ABOUT 2C WILL RESULT IN BETTER MID

LEVEL LAPSE RATES WITH SIMILAR INSTABILITY SO EXPECT A SOMEWHAT

HIGHER RISK AND GREATER AREAL COVERAGE OF SHOWERS/TSTMS ACROSS

THE INTERIOR. WIND FIELD IS EVEN LIGHTER TOMORROW WITH WEAKER

0-6KM SHEAR SO NOTHING MORE THAN PULSE STORMS EXPECTED WITH HEAVY

RAIN THE PRIMARY THREAT. BUT CANT RULE OUT A WET MICROBURST GIVEN

ABUNDANT MOISTURE AND INSTABILITY.

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00z GFS/GGEM/Ukie says Thursday is a potential day to monitor for the Northeast region in general, especially the latter, which has a 994 mb low in southern Quebec and a rather robust, negatively tilted shortwave moving into the area.

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