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SE PA/Mt. Holly severe threats..


NaoPos

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A friend called me about 20 minutes ago and said he was on the

AC Expressway and saw some clouds up high spinning a little

bit near Egg Harbor City. The radar eventually did show a weak

circulation approaching Galloway and the AC Airport. Has to be

some hail in that storm I would imagine.

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Cell near Mystic Island, taken from just west of my house, about 30 miles away, I think. Few minutes before this it wasn't even there.

and..nothing really happened from that cell beside some rain and thunder....storms have been coming out of no where the majority of the day. We're having one right now, lol

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A friend called me about 20 minutes ago and said he was on the

AC Expressway and saw some clouds up high spinning a little

bit near Egg Harbor City. The radar eventually did show a weak

circulation approaching Galloway and the AC Airport. Has to be

some hail in that storm I would imagine.

it had a strong hail core, now its weakening.

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It was pretty cool to see on radar how those storms blossomed upon hitting the sea breeze working its way inland: TIME SENSITIVE:

http://synoptic.envs...=Fort Dix Radar

yea i posted in the obs thread during the afternoon showing the sea breeze and the outflow boundary coming south from montco an bucks from a dying storm. Pretty neat to see like you said.

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A little annoyed with myself, a ton of great pics are out there from east of me, scud, shelf, roll clouds, etc. Picked a bad day to fall asleep, lol. But oh well, that's the way it goes sometimes.

We know you're still

Exhausted from your time with Lee!!

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Another 5% risk day from Philly to NY. Narrow corridor of instability with a weak front drapped across the region. That should be the focal point of lift. Nothing more than what we've been seeing the last few days. Diurnal storms yada yada yada... Thinking areas closer from Trenton to NYC have the better chance at something.

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Another 5% risk day from Philly to NY. Narrow corridor of instability with a weak front drapped across the region. That should be the focal point of lift. Nothing more than what we've been seeing the last few days. Diurnal storms yada yada yada... Thinking areas closer from Trenton to NYC have the better chance at something.

CAPE and helicity (thanks Tom) values on the RAP this morning support this...

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Another 5% risk day from Philly to NY. Narrow corridor of instability with a weak front drapped across the region. That should be the focal point of lift. Nothing more than what we've been seeing the last few days. Diurnal storms yada yada yada... Thinking areas closer from Trenton to NYC have the better chance at something.

pretty much bri. The best forcing and trigger is up north with the front.

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  • 2 weeks later...

Day 2 slight risk for the entire area.

DAY 2 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

1248 AM CDT THU JUN 21 2012

VALID 221200Z - 231200Z

...THERE IS A SLGT RISK OF SVR TSTMS FROM THE DELMARVA TO SRN NEW

ENGLAND...

...DELMARVA TO SRN NEW ENGLAND...

WEAK HEIGHT FALLS WILL OVERSPREAD THE OH VALLEY/LOWER GREAT LAKES

REGION FRIDAY AS UPPER TROUGH SHIFTS EAST. IN RESPONSE TO THIS

TROUGH IT APPEARS THE PRIMARY BAROCLINIC ZONE WILL EXTEND FROM NRN

VT/NH...SWWD INTO ERN KY AT 18Z. DIURNAL CONVECTION IS EXPECTED TO

INITIATE/INTENSIFY ALONG THIS CORRIDOR BY EARLY AFTERNOON AS

BOUNDARY LAYER WARMS REMOVING EARLY MORNING INHIBITION. LATEST

MODEL GUIDANCE SUGGEST WARM SECTOR INSTABILITY COULD EXCEED 2500

J/KG ACROSS THE DELMARVA REGION WHERE SFC TEMPERATURES ARE EXPECTED

TO WARM INTO THE UPPER 80S/LOWER 90S. AS A RESULT...ROBUST UPDRAFTS

SHOULD EVOLVE PRIMARILY EAST OF THE APPALACHIANS WITHIN A SHEARED

ENVIRONMENT FAVORABLE FOR MULTI-CELL STORMS. GREATEST CONCENTRATION

OF THUNDERSTORMS WILL LIKELY BE NOTED AFTER 21Z FROM NRN VA INTO SRN

NEW ENGLAND AND ACTIVITY SHOULD SPREAD ESEWD TOWARD THE ATLANTIC

COAST DURING THE EARLY EVENING HOURS. GUSTY WINDS AND ISOLATED

SEVERE DOWNBURSTS ARE THE PRIMARY SEVERE THREAT WITH THIS

CONVECTION.

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Mt.Holly's thoughts

03Z/21 SREF PROB FOR SVR IN THE I95 CORRIDOR COMBINES WITH AN

EC/GFS MODELED TT 48-50...LARGE INSTABILITY ...DECENT MID LVL

LAPSE RATES AND INCREASING 0-6KM SHEAR TO ABOUT 30 KTS TO PROBABLY

PERMIT A FEW SVR TSTMS IN THE I95 CORRIDOR FRI AFTN. CONTG THE

THEME OF HEAVY CONVECTION...PWAT OF 1.75 INCH WILL MEAN SOME SPOTS

WILL HAVE POOR DRAINAGE STREET FLOODING IN SLOW ESEWD DEVELOPING

CONVECTIVE CLUSTERS OR A BAND. WILL CHECK 12Z SPC WRF FOR

ADJUSTMENTS IN THINKING.

EVEN A VERY VERY LOW PROB TOR NEAR SEA BREEZE INTERSECTION IN NE

NJ.

&&

Nce write up Walt.

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Latest RPM just shown on nbc10 is now showing some super cells for tomorrow Philly on south and east. Also the 18z Nam has slowed the front down somewhat. Would not be surprised to see 1-2 inches in some places that see slow moving training segments. Primarily I95 on east for the time being.

the sref mean has been slowly been getting wetter with each run. now has .75-1 for the phl area on east. Pwats will be pretty high tomorrow so it will monsoon in these storms. Only worry i have for philly area is the storms form right over the region and really get going to the east of the river.

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the sref mean has been slowly been getting wetter with each run. now has .75-1 for the phl area on east. Pwats will be pretty high tomorrow so it will monsoon in these storms. Only worry i have for philly area is the storms form right over the region and really get going to the east of the river.

your worry is my hope lol...I can't even remember what thunder sounds like at this point...

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Latest RPM just shown on nbc10 is now showing some super cells for tomorrow Philly on south and east. Also the 18z Nam has slowed the front down somewhat. Would not be surprised to see 1-2 inches in some places that see slow moving training segments. Primarily I95 on east for the time being.

It's all timing dependent. If the front slows any further development could be west of 95.

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the sref mean has been slowly been getting wetter with each run. now has .75-1 for the phl area on east. Pwats will be pretty high tomorrow so it will monsoon in these storms. Only worry i have for philly area is the storms form right over the region and really get going to the east of the river.

For what it is worth the 18z GFS has just come in wetter as well.

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Soo tomorrow is ok...iI think the biggest threat would be downburst due to collapsing updrafts due to water loading. Without sufficient shear to tilt the updrafts, this can happen. We'll see. Liking Mondays threat a whole lot more.

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