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2013 Mt. Holly CWA Convection Thread


SouthernNJ

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TDWR showed Very Strong low-level rotation at 439 PM EDT

over Glasgow, the rotation continued over I-95 near Newark

between 445 and 451 PM scans of TDWR.  Even saw a BWER

signature on reflectivity near Newark at 451.  My guess is the

warning forecaster saw the TDS, checked TDWR and issued

the warning at 446 PM. 

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my golf course in wayne is absolutely getting owned by rain... 2.16 and counting... .06 in a minute

 

How you think the USGA is feeling?

 

Recently we have had more of low lcl days that are tornadic or potentially tornadic around our area, days with flash flood watches are becoming the ones to watch for tornadoes too.  Think of that tornado in Philly a couple of years ago and last September.

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How you think the USGA is feeling?

Recently we have had more of low lcl days that are tornadic or potentially tornadic around our area, days with flash flood watches are becoming the ones to watch for tornadoes too. Think of that tornado in Philly a couple of years ago and last September.

Merion is state of the art with there drainage and what not. I know a good amount of the volunteers working at it and they will be fine as long as the creeks don't flood or wash up onto the greens. I have never played at mention but their greens I would imagine are built to USDA specs which is 12 inches of a 80/20 sand/ mushroom soil mix. Even after all the rains the sand greens drain very fast. Our course main issues is we are on old push up greens with native clay soil

. Anyways off topic but up to 2.87 at the course in Wayne. I imagine pretty good flooding I the area

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Gotta admit I didn't think we'd have a tornado near Wilmington and a TOR watch up into Philly today. The heavy rain was definitely there but the severe was not expected by most folks.

 

The severe threat so far has been rather isolated.

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Thanks Mike. Heard about damage following up Route 72 to where the housing development is. Lots of trees and wires down, consistent with what you guys have in the LSR. NBC 10 just said something about it on the 6 pm news.

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Merion is state of the art with there drainage and what not. I know a good amount of the volunteers working at it and they will be fine as long as the creeks don't flood or wash up onto the greens. I have never played at mention but their greens I would imagine are built to USDA specs which is 12 inches of a 80/20 sand/ mushroom soil mix. Even after all the rains the sand greens drain very fast. Our course main issues is we are on old push up greens with native clay soil

. Anyways off topic but up to 2.87 at the course in Wayne. I imagine pretty good flooding I the area

I can confirm that. 3 cars stuck in the middle of Lancaster Ave. by Landmark.

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MESOSCALE DISCUSSION 1027

NWS STORM PREDICTION CENTER NORMAN OK

0741 PM CDT MON JUN 10 2013

AREAS AFFECTED...ERN MD/VA...DE...SRN NJ

CONCERNING...TORNADO WATCH 293...

VALID 110041Z - 110145Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 293 CONTINUES.

SUMMARY...A LOW-END TORNADO RISK MAY PERSIST FOR A COUPLE HOURS

BEYOND 02Z SCHEDULED EXPIRATION OF WW 293. SPC WILL COORDINATE WITH

AFFECTED WFOS ON A PROBABLE TEMPORAL EXTENSION OR POSSIBLY A

REPLACEMENT WW.

DISCUSSION...N/S-ORIENTED CONVECTIVE BAND CONTINUES TO TRACK EWD AT

AROUND 20-25 KT. A FEW TRANSIENT EMBEDDED MESOCYCLONES HAVE BEEN

NOTED IN AREA RADAR IMAGERY. GIVEN THE PERVASIVE UPPER 60S TO LOWER

70S SURFACE DEW POINTS WITH A LARGE CURVING HODOGRAPH NOTED IN 00Z

DOX/AKQ VWP DATA...THERE IS CONCERN THAT A LOW-END TORNADO RISK MAY

PERSIST INTO LATE EVENING. STILL...WITH INSTABILITY LACKING IN THE

00Z WAL/IAD RAOBS...THE LONGEVITY OF THE TORNADO THREAT IS A BIT

UNCERTAIN.

..GRAMS/MEAD.. 06/11/2013

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MESOSCALE DISCUSSION 1027

NWS STORM PREDICTION CENTER NORMAN OK

0741 PM CDT MON JUN 10 2013

AREAS AFFECTED...ERN MD/VA...DE...SRN NJ

CONCERNING...TORNADO WATCH 293...

VALID 110041Z - 110145Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 293 CONTINUES.

SUMMARY...A LOW-END TORNADO RISK MAY PERSIST FOR A COUPLE HOURS

BEYOND 02Z SCHEDULED EXPIRATION OF WW 293. SPC WILL COORDINATE WITH

AFFECTED WFOS ON A PROBABLE TEMPORAL EXTENSION OR POSSIBLY A

REPLACEMENT WW.

DISCUSSION...N/S-ORIENTED CONVECTIVE BAND CONTINUES TO TRACK EWD AT

AROUND 20-25 KT. A FEW TRANSIENT EMBEDDED MESOCYCLONES HAVE BEEN

NOTED IN AREA RADAR IMAGERY. GIVEN THE PERVASIVE UPPER 60S TO LOWER

70S SURFACE DEW POINTS WITH A LARGE CURVING HODOGRAPH NOTED IN 00Z

DOX/AKQ VWP DATA...THERE IS CONCERN THAT A LOW-END TORNADO RISK MAY

PERSIST INTO LATE EVENING. STILL...WITH INSTABILITY LACKING IN THE

00Z WAL/IAD RAOBS...THE LONGEVITY OF THE TORNADO THREAT IS A BIT

UNCERTAIN.

..GRAMS/MEAD.. 06/11/2013

Down in DC nasty line just came through, not severe here though.

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I dont know how much it costs, but its worthwhile if not much to buy the RAOB program. It gives a truer picture of atmospheric instability because you can change the erroneously high sfc dew points that the GFS et al forecast way too often. That cape is based on a 76 dew point at ILG, gfs mos is about 10F lower.  This doesnt take away from the severe threat on Thursday as the fcst bulk shear is not thrown off the rails as much by that inherent model error and the warm sector/near warm sector is going to be problematical regardless. Sub/near 1000 mb lows in June dont go quietly into the night.

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I dont know how much it costs, but its worthwhile if not much to buy the RAOB program. It gives a truer picture of atmospheric instability because you can change the erroneously high sfc dew points that the GFS et al forecast way too often. That cape is based on a 76 dew point at ILG, gfs mos is about 10F lower.  This doesnt take away from the severe threat on Thursday as the fcst bulk shear is not thrown off the rails as much by that inherent model error and the warm sector/near warm sector is going to be problematical regardless. Sub/near 1000 mb lows in June dont go quietly into the night.

I agree, whenever you have a contrast of 50s on the north side of the low and upper 80s to near 90 on the south side of the low, that type of gradient raises eyebrows.  Either way you put it, this will have an affect on the region, unless the track shift way up into new england. A track over and south of philly will put us in a heavy rain threat. A track north of philly through lehigh valley will put se pa on south in a major risk for severe weather. 

 

I don't have the adjusted numbers like you do, so i can only go off the inflated gfs numbers. The 12z gfs has some sick numbers for se pa on south. Cape is over 1500, with LI over -6, and the shear straight through the column is pretty robust. The metro area is right on the cusp for severe impact, so if you are a fan of this you would want the gfs to nudge a little further north.

 

The 12z euro is a little further south than the gfs and track the low basically right over the pa turnpike. Which in my opinion would put the best severe chances from delaware and extreme southern jerz south and west. The euro also slows down the low and pretty much has it raining for a day plus... it is spitting out another 2-4 inches of rain for the region

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For Delmarva on Thursday lapse rates appear steep with sufficient instability in the hail growth zone. The bulk shear shown above will promote storm organization and a wind threat. From looking at this I would suspect severe storms, slight risk is justified depending on low track for the region. Hydro concerns will again be the main issue. 

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