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May observations and discussions...


ag3

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Cape values have increased to near 3000 in our area, I would be shocked if we didn't see storms sustain themselves later on this evening. The best instability looks to be over the poconos but we certainly have a very unstable atmosphere here as well.

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Cape values have increased to near 3000 in our area, I would be shocked if we didn't see storms sustain themselves later on this evening. The best instability looks to be over the poconos but we certainly have a very unstable atmosphere here as well.

Elevated only. No severe. Rain will be biggest threat.

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SPC still humming over Severe t-storm watch further east:

mcd0966.gif

HE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 315

CONTINUES.

SUMMARY...THREAT OF DMGG WIND AND HAIL PERSISTS ACROSS SEVERE WW

315. STABLE AREAS IN THE WAKE OF THE PRE-FRONTAL LINE OF CONVECTION

MAY BE CLEARED. AREAS DOWNSTREAM ARE STILL BEING MONITORED FOR A

POTENTIAL WW.

DISCUSSION...A BROKEN LINE OF CONVECTION CONTINUES TO PROGRESS

EWD...AND HAS MOVED OUT OF SEVERE WW312. ACROSS SERN NY...AN OUTFLOW

BOUNDARY FROM CONVECTION OVER THE CATSKILLS IS SURGING NWWD...AND

MAY LOCALLY ENHANCE THE STRENGTH OF THE STORMS TO THE W AS THE

BOUNDARIES MERGE. OTHERWISE...THE AIR MASS ACROSS SERN NY INTO WRN

MA REMAINS MODERATELY UNSTABLE...AND WILL CONTINUE TO SUPPORT SEVERE

WINDS AND HAIL.

FARTHER S...AREA VAD WIND PROFILE DATA SUGGESTS THAT THE STRONGER

LOW-LEVEL WINDS REMAIN BEHIND THE PRIMARY LINE OF CONVECTION.

HOWEVER...STEEP LOW-LEVEL LAPSE RATES ACROSS ERN PA INTO NJ MAY

STILL SUPPORT A DMGG WIND THREAT. AREAS TO THE EAST OF WW315 ARE

BEING MONITORED FOR A POSSIBLE WW. ALTHOUGH NOCTURNAL COOLING WILL

GRADUALLY STABILIZE THE BOUNDARY LAYER...SEASONABLY WARM/HUMID

CONDITIONS AND WARM ADVECTION REGIME MAY LEAD TO A SLOWER THAN

TYPICAL DEVELOPMENT OF THE INVERSION.

..HURLBUT.. 05/29/2012

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The radar presentation has improved with some stratiform rain behind the storms indicative of at least an attempt to form a cold pool. However the storms are just now entering very poor 0-6km/effective shear parameters. To the east of these favorable shear parameters and kinematics is the best instability.

As long as we can continue the forcing for ascent farther east, these storms will be running into 3000j/kg of surface based cape. Which, despite weak shear, is enough to support updraft development in itself with some strong forcing.

sbcp.gif?1338327108382

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Yeah the southern half of that line looks nice for areas south of 78 maybe.

Being in southern somerset county, that would include my location :P

If it does reach my area, I will no doubt keep you guys posted.

FWIW, Wunderground radar is showing some nice hail producers in that line in South Central PA.

http://www.wunderground.com/radar/radblast.asp?zoommode=zoom&num=6&delay=15&rbscale=0.5630434782608695&scale=1.000&noclutter=0&ID=CCX&type=N0R&lat=0&lon=0&label=you&showstorms=10&map.x=486.5&map.y=284.5&centerx=400&centery=240&lightning=0&smooth=0&showlabels=1&rainsnow=0

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THE ENTIRE AREA IS CURRENTLY UNDER A SLIGHT RISK FOR SEVERE WEATHER

TODAY INTO THIS EVENING...WITH A MODERATE RISK BORDERING ORANGE

COUNTY. A SEVERE THUNDERSTORM WATCH COULD BE POSSIBLE SOON FOR

ROUGHLY THE NW HALF OF THE CWA. MOST RECENT ACARS SOUNDINGS HINT A

WEAK CAP NEAR 750-700 MB...BUT IT LOOKS LIKE THIS WILL NOT BE STRONG

ENOUGH TO PRECLUDE CONVECTION HERE. BULK SHEAR IS SHOULD BE AROUND

30KT EARLY THIS EVENING..WITH THE HIGHER VALUES GENERALLY ACROSS THE

NORTHERN ZONES...AND WITH A UNIDIRECTIONAL FLOW.

MAIN THREAT WITH THE THUNDERSTORMS WILL BE HEAVY DOWNPOURS AS PWAT

VALUES WILL BE NEAR 1.4 TO 1.5 INCHES. STRONG WIND GUSTS WILL BE

POSSIBLE...AND WITH CAPE AROUND 700-800 J/KG IN THE -10C TO -30C

REGION COUPLED WITH LAPSE RATES OF AROUND 6.5 TO 7.0 C/KM JUST BELOW

IT...LARGE HAIL IS STILL A POSSIBILITY IN SPITE OF RELATIVELY HIGH

WET BULB ZERO VALUES.

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