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Severe wx potential Wednesday


free_man

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If we get upgraded to moderate risk I'll hear Wiz's girlish scream from across town

I hear they love to replay his girlish screams that one time on the HAM radio, they saved it and pull it out for laughter on a boring day.

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many stations in Eastern PA, Maryland, and Virginia are reporting 70 degree dewpoints or slightly higher.

Mt. Holly has a good AFD.

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE MOUNT HOLLY NJ

751 PM EDT TUE MAY 31 2011

.SHORT TERM /6 AM WEDNESDAY MORNING THROUGH FRIDAY/...

THE EXCESSIVE HEAT WARNING WILL REMAIN IN EFFECT THROUGH WEDNESDAY. THE

ENDING TIME MAY BE TOO LATE PENDING CONVECTION. SO FAR THE EARLY

HEAT INDEX CRITERIA FOR ADVISORIES OR WARNINGS WAS REACHED YDA AT PHL,

TDY AT ILG SO FAR. WITH TOMORROW EXPECTED TO COME AT OR CLOSE TO

CRITERIA AGAIN. THE FACT ITS AN EARLY HEAT WAVE (PLUS WE DID NOT

GET RELIEF TODAY) WE DECIDED TO GO WITH THE EXCESSIVE HEAT

WARNING. DEW POINTS HAVE POOLED WEST OF US TODAY AND EVEN WITH

THE POTENTIAL FOR MORE MIXING ON WEDNESDAY THE PRESENCE OF A LEE

SIDE TROF SHOULD POOL THE DEW POINTS AGAIN. WE COULD BE WRONG IF

CONVECTION FIRES AS EARLY AS THE WRF-NMM HAS ABOUT THE HEAT, BUT WE

OPTED FOR A CONVECTIVE TIMING CLOSER TO THE SREF AND GFS GIVEN HOW

FAR WEST THE COLD FRONT IS TDY AND THE TIME NEEDED TO DEVELOP THE

LEE SIDE TROF.

AS FOR THE CONVECTIVE POTENTIAL, THERE IS NO VIGOROUS SHORT WAVE,

BUT THE OVERALL FRONTAL TIMING STILL LOOKS GOOD. THE VERY LOW

STAT GUIDANCE POPS LOOK BEFUDDLING GIVEN THE LATTER. THEY DO DROP

THE DEW POINTS (AGAIN) DURING THE AFTERNOON, BUT THAT DOES NOT

SEEM AS PROBABLE BECAUSE OF THE EXPECTED LEE SIDE TROF. IT WOULD

APPEAR THIS IS THE REASON (TOO MUCH CIN) THAT POPS ARE TOO LOW AND

THAT THE HI RES WRF MODELS DO NOT SHOW MUCH CONVECTION AT ALL.

ON THE OTHER END OF THE SPECTRUM ARE THE ACTUAL MODEL FCST DEW

POINTS WHICH ARE AS HIGH AS THE UPPER 70S. WE TRIED TO SORT THE

DIFFERENCE BETWEEN THEM USING THE RAOB PROGRAM AND WE ARRIVED AT A

MLCAPE OF 2000-2500J WITH TT(S) IN THE LOWER 50S. THE FCST CIN ALL

BUT DISAPPEARS, IT IS CLOSE. WE DID NOTE THAT THE FCST BULK SHEAR

IS EXPECTED TO INCREASE AS THE DAY PROGRESSES, ESPECIALLY NORTHERN

PART OF OUR CWA. ALSO THE FCST MID LEVEL QVEC CONVERGENCE. ON THE

OTHER HAND THE FORECAST EML DOES NOT DISAPPEAR, BUT IS EXPECTED TO

EXIT STAGE RIGHT DURING THE MORNING LEAVING MORE TYPICAL MID LEVEL

LAPSE RATES DURING THE AFTERNOON. SUFFICE THERE ARE ENOUGH

INDICATIONS TO GO ABOVE STAT GUIDANCE FOR POPS AND INCLUDE SOME ENHANCED

WORDING WITH THE TSRAS. TSRA TIMING WAS CLOSE TO SREF PROB OF SVR

TSRA PEAKING AROUND 21Z IN THE DE VALLEY. SPC HAS KEPT US IN THE

SLIGHT RISK.

THE MODELS REMAIN PRETTY CONSISTENT ABOUT A QUICK EXIT OR

DISSIPATION OF CONVECTION DURING THE EVENING HOURS. THIS SUITE OF

MODEL RUNS HAS BECOME MORE AGGRESSIVE WITH THE CAA. A BIT SKEPTICAL

BECAUSE OF THE POSN OF THE FORECAST JET, SO WE WENT ABOVE STAT

GUIDANCE FOR MINS AND LEANED TOWARD THE HIER GFS MOS MAX TEMPS ON

THU. ON THU THE CHANNELIZED VORT MAX IS FORECAST TO REMAIN NORTHEAST

OF OUR CWA, SO WE CONTINUED THE POPLESS FORECAST. AS FAR AS WINDS,

THE HIGHER WINDS ARE EXPECTED TO REMAIN ABOVE THE SUBSIDENCE

INVERSION, SO WE WENT WITH THE LOWER GFS MOS. IT ALSO SEEMS TO FIT

THE LOOK OF THE ISOBARIC PATTERN OVER OUR CWA.

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lol I'm not haha

I think they've become just a shade more conservative in the northeast recently. The last few times they amped up the outlooks in the NE, they were pretty big disappointments. Though it seems like a lot of the recent disappointments have been because of a lack of good steep ML lapse rates...or even just decent. We know we'll have the shear and we know we'll have the lapse rates, we just want to make sure we actually get some storms to fire tomorrow. Drier dewpoints or a lack of sfc heating would probably be the way we'd get screwed.

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If you look at the SPC mesoanalysis graphics, you can see what the EML does for you. MLCAPE values currently in excess of 4000 J/KG in a portion of central PA. That's about as high as they get in the northeast. If our "normal" northeast lapse rates were in place, you could easily shave 1500 joules off that. +15 to +17c 850 dews are very impressive.

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I think they've become just a shade more conservative in the northeast recently. The last few times they amped up the outlooks in the NE, they were pretty big disappointments. Though it seems like a lot of the recent disappointments have been because of a lack of good steep ML lapse rates...or even just decent. We know we'll have the shear and we know we'll have the lapse rates, we just want to make sure we actually get some storms to fire tomorrow. Drier dewpoints or a lack of sfc heating would probably be the way we'd get screwed.

We'll know by the 1630z outlook if this is the real deal or not lol

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does anyone care to comment on the possibility of elevated convection with the warm front that rolls through over night tonight? maybe that's where we get our best shot at storms?

I haven't looked at this potential in great detail but we may see something roll through later tonight, possibly some sort of MCS which would come through in the early AM hours tomorrow.

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ha ha. yeah i suppose. but i wasn't looking at bufkit at that point.

man the 00z soundings from PA into OH/MI look nice. look at PIT. LOL.

lol

and yeah the 00z soundings are sick. Tomorrow has the potential to be fun... let's see if all the pieces can actually fall into place.

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