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Monday showers/thunder threat


free_man

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BOX tells Wiz not to suck on the gun just yet

AN AREA OF SHOWERS WILL IMPACT MUCH OF THE RGN THE NEXT HR OR TWO

IN ASSOC WITH A DIFFUSE MCS REMNANT FROM THIS MORNING INTO THE

MIDDAY PD. THEREAFTER...UPSTREAM CLEARING HAS LED TO SFC BOUNDARY

LYR DESTABILIZATION AND CONVECTIVE WX HAS DEVELOPED ACCORDINGLY.

IN BREVITY...EXPECT CONVECTIVE ACTIVITY TO INCREASE IN COVERAGE

INTO THE EVNG PD N/W OF THE FCST RGN AND ADVECT S/SE INTO THE S

NEW ENGLAND BEGINNING AROUND 21Z AND ON INTO MIDNIGHT. THE

SEVERITY OF THE WX MAY BE LESSENED BY THE FACT OF TODAYS ATTENDANT

CLOUD COVER AND COOLER WX. NEVERTHELESS STILL HAVE LIKELY POPS

WITH THE EXPECTATION OF CONVECTION...THE MAIN THREATS BEING HEAVY

RAIN...GUSTY WINDS...AND SMALL HAIL. WITH HEAVY RAIN POTENTIAL...

AND VERY MOIST ATMOS PROFILE...THERE IS STILL A CHC THIS EVNG OF

SEEING LOCALIZED URBAN AND POOR DRAINAGE FLOODING.

EVALUATING THE LATEST MESORUC ANALYSIS...TONGUE OF WARM THETAE AIR

IS ADVECTING ALONG WITH 20-30 KT WLY FLOW FROM CENTRAL PA / S NY

INTO S NEW ENGLAND ALONG AND AHEAD OF THE CONVECTIVE WX PRESENTLY

DEVELOPING IN THE NW TIER OF THE NE CONUS. MESORUC ADVERTISES

SOME INSTABILITY ACROSS THE RGN BUT CONFIDENCE IN THIS SOLN IS LOW

WITH ATTENDANT CLOUD COVER. YET SFC TEMPS ARE MILD WITH FAIRLY

MOIST DEWPOINTS...AND THIS AIRMASS AHEAD OF THE SFC COLD FRONT MAY

SIMPLY BE FUEL AHEAD OF THE COLD FRONT AS IT SHUNTS S. SO WITH

30-40 KT NW 0-6 KM BULK SHEAR ORTHOGONAL TO THE SFC COLD

FRONT...SOME MID-LVL INSTABILITY PRESENT...AND A VERY WARM AND

MOIST UNSTABLE AIRMASS...LIKELY POPS SEEM WARRANTED ALONG WITH

AFOREMENTIONED THREATS ALONG WITH TIMING ABOVE.

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MD out for upstream

MESOSCALE DISCUSSION 1653 NWS STORM PREDICTION CENTER NORMAN OK 0258 PM CDT MON JUL 18 2011 AREAS AFFECTED...WRN INTO NRN NY AND NW VT CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE VALID 181958Z - 182130Z STORMS WILL INCREASE IN COVERAGE AND INTENSITY OVER THE NEXT 1-2 HOURS. STRONG TO SEVERE STORMS WILL BE POSSIBLE WITH DAMAGING WINDS BEING THE MAIN THREAT. STRONG STORMS HAVE DEVELOPED OVER SOUTHEASTERN ONTARIO AHEAD OF THE MAIN SYNOPTIC COLD FRONT FURTHER NORTH ACROSS NERN ONTARIO AND WRN QUEBEC. OTHER SHOWERS AND STORMS HAVE BEEN TRYING TO INITIATE ACROSS NRN NY INTO NRN VT AS WELL WHERE TEMPERATURES HAVE WARMED INTO THE MID 70S TO MID 80S. WITH DEWPOINTS IN THE UPPER 60S TO LOW 70S...A MODERATELY UNSTABLE AIR MASS HAS RESULTED WITH SBCAPE VALUES AROUND 1000-1500 J/KG. WATER VAPOR IMAGERY INDICATED A VORTICITY MAX CURRENTLY OVER SRN QUEBEC MOVING E/SE AND COUPLED WITH FORCING FROM THE APPROACHING COLD FRONT...MAY AID IN SOME ORGANIZED SEVERE THREAT LATE THIS AFTERNOON INTO THIS EVENING ACROSS PORTIONS OF WRN/NRN NY/NW VT. HOWEVER...SOME UNCERTAINTY EXISTS AS TO THE EXTENT OF STORM COVERAGE AND INTENSITY GIVEN POOR LAPSE RATES AND SOMEWHAT MARGINAL BULK SHEAR VALUES AROUND 25-40 KT. ..LEITMAN.. 07/18/2011

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BOX tells Wiz not to suck on the gun just yet

AN AREA OF SHOWERS WILL IMPACT MUCH OF THE RGN THE NEXT HR OR TWO

IN ASSOC WITH A DIFFUSE MCS REMNANT FROM THIS MORNING INTO THE

MIDDAY PD. THEREAFTER...UPSTREAM CLEARING HAS LED TO SFC BOUNDARY

LYR DESTABILIZATION AND CONVECTIVE WX HAS DEVELOPED ACCORDINGLY.

IN BREVITY...EXPECT CONVECTIVE ACTIVITY TO INCREASE IN COVERAGE

INTO THE EVNG PD N/W OF THE FCST RGN AND ADVECT S/SE INTO THE S

NEW ENGLAND BEGINNING AROUND 21Z AND ON INTO MIDNIGHT. THE

SEVERITY OF THE WX MAY BE LESSENED BY THE FACT OF TODAYS ATTENDANT

CLOUD COVER AND COOLER WX. NEVERTHELESS STILL HAVE LIKELY POPS

WITH THE EXPECTATION OF CONVECTION...THE MAIN THREATS BEING HEAVY

RAIN...GUSTY WINDS...AND SMALL HAIL. WITH HEAVY RAIN POTENTIAL...

AND VERY MOIST ATMOS PROFILE...THERE IS STILL A CHC THIS EVNG OF

SEEING LOCALIZED URBAN AND POOR DRAINAGE FLOODING.

EVALUATING THE LATEST MESORUC ANALYSIS...TONGUE OF WARM THETAE AIR

IS ADVECTING ALONG WITH 20-30 KT WLY FLOW FROM CENTRAL PA / S NY

INTO S NEW ENGLAND ALONG AND AHEAD OF THE CONVECTIVE WX PRESENTLY

DEVELOPING IN THE NW TIER OF THE NE CONUS. MESORUC ADVERTISES

SOME INSTABILITY ACROSS THE RGN BUT CONFIDENCE IN THIS SOLN IS LOW

WITH ATTENDANT CLOUD COVER. YET SFC TEMPS ARE MILD WITH FAIRLY

MOIST DEWPOINTS...AND THIS AIRMASS AHEAD OF THE SFC COLD FRONT MAY

SIMPLY BE FUEL AHEAD OF THE COLD FRONT AS IT SHUNTS S. SO WITH

30-40 KT NW 0-6 KM BULK SHEAR ORTHOGONAL TO THE SFC COLD

FRONT...SOME MID-LVL INSTABILITY PRESENT...AND A VERY WARM AND

MOIST UNSTABLE AIRMASS...LIKELY POPS SEEM WARRANTED ALONG WITH

AFOREMENTIONED THREATS ALONG WITH TIMING ABOVE.

:weenie:

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Miraculously a couple moderate cells have popped down this way, hoping to get at least a tenth or two, better than nothing I guess.............nocturnal would be nice later.

good downpour here right now--will save everything from complete wiltage on Friday!

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Going to be interesting to see what transpires this evening. The sun has finally came out, although likely too late to really do much but perhaps temps can bump up a few degrees...with the shower activity we had the low-level moisture/dews should get a boost as well which will help add to the instability, even with the slightest of warming. As many thought and what some models showed, convection really screwed with the ML lapse rates, however, they seem to actually be recovering quite well ahead of the front and ahead of the developing line of storms...ML lapse rates now nearing 7 C/KM and appear to be improving towards SNE as well, if this can happen here that would help to destabilize things further as well.

Shear is pretty strong with vertical shear values in the 30-40 knots range and helicity values are quite high too and the shear should get a bit stronger as we move through the evening.

Still should see some thunderstorms later this evening with the potential for some strong to severe weather but it shouldn't be anything too widespread.

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cell that just popped up over myles standish state forest in plymouth is making a bee-line right for my sister...just crappy showers exiting my area...nice individual cells popping in C/NNE...

It almost looks as though those cells are forming into a line on the latest returns. Could this be what the NMM and ARW is hinting at?

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cell that just popped up over myles standish state forest in plymouth is making a bee-line right for my sister...just crappy showers exiting my area...nice individual cells popping in C/NNE...

dang in a matter of minutes that cell blew up, went severe, and bowed out!!!

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I actually wish though nothing would pop up over our region for like an hour or 90 minutes...the atmosphere is really trying to recover, especially those ML lapse rates.

Looks like the line that developed LI-CC was the main threat. Not expecting much more.

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We'll see what happens as we go through the evening...stuff in VT looking quite healthy with some stuff developing in NY...maybe nothing widespread but probably isolated/scattered activity.

I wouldn't be surprised it a scattered line developed from NNH back into upstate NY... you can see it starting on satellite. But that'll wouldn't work down until at least 10PM and by that time meh.

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