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Tuesday July 26th Thunderstorm Potential


bluewave

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With the cold front moving through, there will be the potential for thunderstorms later on.

The shear will be there for some of the storms to possibly go severe with a mid level

jet max of around 50 KT.We'll have to wait and see if we can destabilize enough

for the severe potential to be realized.

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12Z NAM has a nasty squall line south of LI later but it looks like it doesnt get its act together till its south of the city. Big bullseye in SNE as well.

12z sounding out of Upton is pathetic, but its a morning sounding before things destabalize, but still

skew_KOKX.gif

KALB, more impressive, I think SNE really does well today

skew_KALB.gif

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These storms have a tendency to stay relegated to southern new England in these events...but the vorticity is positioned well to get stuff going down here today. I think SE NY, N NJ, and SW CT will do well with scattered southward propagating storms later.

I think they cash in, but as you say wouldnt be surprised to see some action away from the coast.

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The sourthernmost current activity is on a track to hit Sussex County NJ in about 5-6 hours. its a big iff but I'm glad to see some activity going that far south. The shear is 20-40kts, SBCAPE is already in the 500-1000 J/KG area. One potential limiting factor could be the very poor mid-level lapse rates. Low level lapse rates are very good though. Lets see if we go slight risk on the next outlook or not, my feeling is no but that could happen later on.

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mcd1747.gif

MESOSCALE DISCUSSION 1747

NWS STORM PREDICTION CENTER NORMAN OK

1234 PM CDT TUE JUL 26 2011

AREAS AFFECTED...WRN ME...SRN/CNTRL NH...SERN NY...AND PORTIONS OF

MA/CT/RI

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 261734Z - 261900Z

A WW MAY BECOME NECESSARY OVER WRN ME...SRN/CNTRL NH...SERN NY AND

PORTIONS OF MA/CT/RI DURING THE NEXT FEW HRS. CONVECTIVE AND

ENVIRONMENTAL TRENDS WILL CONTINUE TO BE MONITORED.

AT 17Z...VISIBLE SATELLITE IMAGERY INDICATES CLOUDINESS IS CLEARING

FROM W TO E ACROSS WRN ME SWD INTO MA/CT. THIS IS ALLOWING SURFACE

TEMPERATURES TO GRADUALLY WARM INTO THE 70S...WHICH IS AIDING IN

BOUNDARY LAYER DESTABILIZATION AND INCREASE IN MLCAPE VALUES /AROUND

500 J PER KG BASED ON RECENT OBJECTIVE ANALYSIS GUIDANCE/. AS A

RESULT...STORMS OCCURRING TO THE W WILL LIKELY BEGIN TO EXIT ERN

PORTIONS OF WW 686 DURING THE NEXT FEW HRS. IN ADDITION...RECENT

MODEL GUIDANCE INDICATES ADDITIONAL STORM DEVELOPMENT MAY OCCUR AS

FAR S AS SERN NY. WITH CONTINUED SURFACE HEATING OVER THE AREA...AN

INCREASE IN CAPE SHOULD OCCUR OVER THE REGION /WITH MLCAPE VALUES

CLIMBING UP TO 1500 J PER KG/...WHICH WHEN COUPLED WITH STRONG DEEP

LAYER WLY SHEAR /EFFECTIVE BULK SHEAR VALUES IN EXCESS OF 40

KT/...WILL PROMOTE A THREAT FOR LARGE HAIL AND DAMAGING WINDS.

CONVECTIVE AND ENVIRONMENTAL TRENDS WILL CONTINUE TO BE MONITORED

FOR A POSSIBLE WW.

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If you believe the SPC WRF there's plenty of scattered convection as far south and west as Philly

Doubt it though but do you think long island I gonna see any organized activity this late afternoon/evening been a while since I've seen a good storm lately?, granted the bulk of the big stuff will prolly be north of our area

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Watch out for that cell currently near Scranton, the warning on it was allowed to expire but its broken off from the rest of the pack and is now discrete. If it holds together it will come right across Passaic County and then into the city. Its about to encounter its most unstable atmosphere yet. Bulk shear values are in excess of 45kts

eshr.gif?1311707342078

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