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August 2012 Obs/Disc


Ellinwood

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What a nightmare of a drive home from Jersey this evening. Drove over the Delaware Memorial Bridge as that big cell was passing through Chester County, PA. Nice light show. Then got to Baltimore in time for a deluge. And by the time we got to the Beltway and 270, we got stuck in the Beltway construction. Nearly a dead stop for miles. Disaster.

It seems wet here, so I guess we got in on the very southern end of those storms. Definitely glad for that.

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Day 3 "see text" from SPC it seems. LWX was talking both discrete and linear modes. SPC says ultimately slight risk will probably be needed. Cloud cover concerns for now (as usual).

yeah another little trough coming thru the southern lakes. it looked better yesterday than today imo but we'll see. the nam still isnt entirely on board.

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Day 3 see text, some concerns with cloud cover, but a slight risk seems likely on Day 2 seems like some supercells with hail and maybe tornadoes are possible east of the surface low across most of the Mid Altantic, interesting day, and Thursday and Friday seems a bit interesting

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Day 3 see text, some concerns with cloud cover, but a slight risk seems likely on Day 2 seems like some supercells with hail and maybe tornadoes are possible east of the surface low across most of the Mid Altantic, interesting day, and Thursday and Friday seems a bit interesting

You really think tornadoes? Hmmmm

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HAHA, not really, i think there could be a few supercells, and maybe a tornado or two, well read the SPC day 3, perhaps supercells, pointing out the facts

I see what you are saying but just remember supercells do not mean tornadoes. A storm can be a supercell without tornadoes. I don't think they specifically mention tornado threat.

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Tuesday's setup appears to be weaker than Friday in some areas, most importantly with regards to the speed shear and upper-level dynamics. The cold front is going to lag behind the convection, leaving the mountains and the lee trough as the only lifting mechanisms in the area. Morning convection will also be an issue, but maybe not as much as it was last Friday. The mid-level lapse rates appear to be better than what we saw on Friday, so it does have something going for it in addition to the nice veering wind profile.

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Slight risk possible.

...EASTERN CONUS...

BROAD/MODERATELY STRONG CYCLONIC UPPER FLOW IS EXPECTED TO PREVAIL

ACROSS A LARGE PART OF THE EASTERN STATES...WITH THE BRUNT OF THE

LONGWAVE TROUGH EXPECTED TO SHIFT EAST-NORTHEASTWARD OVER THE LOWER

GREAT LAKES/NORTHEAST STATES ON TUESDAY. EXPECTATIONS OF MODERATE

VERTICAL SHEAR /GENERALLY AROUND 30 KT/ ACROSS THE NORTHEAST STATES

PROVIDES CONCERN FOR ORGANIZED STORM MODES POTENTIALLY INCLUDING

MULTICELLS/SOME SUPERCELLS ALONG/AHEAD OF AN EASTWARD MOVING COLD

FRONT. HOWEVER...MODEL VARIABILITY ASIDE...PRIMARY DAY 3 UNCERTAINTY

SURROUNDS THE DEGREE/SPATIAL PEAK OF PRE-COLD FRONTAL

DESTABILIZATION. PENDING SUBSEQUENT GUIDANCE...PRELIMINARY THINKING

IS THAT PORTIONS OF PA AND WESTERN/SOUTHERN NY AND THE ADJACENT

DELMARVA/NORTHEAST SEABOARD COULD ULTIMATELY WARRANT A CATEGORICAL

SLIGHT RISK...AND THIS WILL BE REEVALUATED IN SUBSEQUENT OUTLOOKS.

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Day 2 from SPC... Well....

..NORTHEAST/MID-ATLANTIC STATES

GIVEN THE LARGE SCALE SCENARIO AS PREVIOUSLY

DESCRIBED...BROAD/MODERATELY STRONG CYCLONIC UPPER FLOW IS EXPECTED

TO PREVAIL ACROSS A LARGE PART OF THE EASTERN STATES...WITH THE

BRUNT OF THE LONGWAVE TROUGH EXPECTED TO SHIFT EAST-NORTHEASTWARD

OVER THE LOWER GREAT LAKES AND NORTHEAST STATES ON TUESDAY. AS THIS

OCCURS...A SURFACE LOW AND COLD FRONT WILL STEADILY PROGRESS

EASTWARD ACROSS THE REGION...WITH TSTMS LIKELY TO DIURNALLY

INTENSIFY ALONG/AHEAD OF THE COLD FRONT TUESDAY AFTERNOON. OTHER

TSTMS MAY ALSO DEVELOP/INTENSIFY NEAR A DEVELOPING PRE-FRONTAL/LEE

TROUGH ACROSS THE DELMARVA VICINITY INTO EASTERN PA/SOUTHEAST NY

VICINITIES.

IT SEEMS POSSIBLE THAT CLOUD COVER/POSSIBLE EARLY DAY PRECIPITATION

MAY HINDER THE DEGREE OF DESTABILIZATION ACROSS THE NORTHEAST

STATES. HOWEVER...WEAK TO MODERATE DESTABILIZATION WITH AT LEAST

POCKETS OF MLCAPE TO 1000-1500 J/KG SEEMS PROBABLE ESPECIALLY ACROSS

PARTS OF PA TO THE DELMARVA/MID-ATLANTIC REGION...WHERE SOMEWHAT

STRONGER HEATING IS ANTICIPATED.

EXPECTATIONS OF MODERATE VERTICAL SHEAR /GENERALLY AROUND 30 KT/

WILL ALLOW FOR SOME ORGANIZED STORM MODES INCLUDING MULTICELLS AND

PERHAPS A FEW SUPERCELLS...WITH ANY SUCH SUPERCELL/POSSIBLE BRIEF

TORNADO POTENTIAL FOCUSED AHEAD OF THE SURFACE LOW/NEAR THE WARM

FRONT. OTHERWISE...DAMAGING WINDS/SPORADIC SEVERE HAIL WILL BE THE

PRIMARY HAZARDS.

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