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Mid-June severe threats


Ian

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I mean I guess we couid still see iso severe like we did yesterday... hopefully its back up near us and not down by EZF

A lot of the models seem to agree on stuff developing W of the area and then sliding and missing DC just to the south. LWX NMM model hits DC more squarely with activity and SPC WRF (00z) also has more storms than the other models. I'm sure we'll have some sort of activity around - could be fringed in DC, though. You look okay down there in VA. 

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15z SPC mesoanalysis is pretty decent for us... ~1500 MLCAPE, 2000 SBCAPE with a small 2500 contour over DCA, LI's -5 to -6, Craven SigSvr at 30 mainly around DCA, LL Lapse Rates ~7.0 C/KM, ML Lapse Rates are approaching 6.5C/KM, 15 to 20 kts 1km shear, bulk shear is around 30 kts (35 kts just NE of DCA), and effective shear is around 25kts for now

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MESOSCALE DISCUSSION 1031

NWS STORM PREDICTION CENTER NORMAN OK

1115 AM CDT TUE JUN 16 2015

AREAS AFFECTED...SRN OHIO...NERN KY...WEST VIRGINIA...NRN/CNTRL

VIRGINIA...MARYLAND...DELAWARE...PARTS OF SERN PENNSYLVANIA AND SRN

NEW JERSEY

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 161615Z - 161815Z

PROBABILITY OF WATCH ISSUANCE...40 PERCENT

SUMMARY...AT LEAST LOCALIZED POTENTIALLY DAMAGING WIND GUSTS

POSSIBLE IN DEVELOPING THUNDERSTORM ACTIVITY THIS AFTERNOON. TRENDS

WILL BE MONITORED FOR CONSOLIDATION INTO EVOLVING STORM

CLUSTERS...WHICH MAY BE ACCOMPANIED BY A MORE ORGANIZED SEVERE WIND

THREAT THAT COULD NECESSITATE A SEVERE WEATHER WATCH THIS AFTERNOON.

DISCUSSION...IN THE PRESENCE OF SEASONABLY HIGH MOISTURE

CONTENT...WEAK TO MODEST BOUNDARY LAYER DESTABILIZATION IS UNDERWAY

ACROSS MUCH OF THE LOWER OHIO VALLEY INTO MID ATLANTIC COAST REGION.

THE INITIATION OF THUNDERSTORM ACTIVITY IS ALREADY UNDERWAY TO THE

WEST OF THE CENTRAL APPALACHIANS...AND ADDITIONAL THUNDERSTORMS

APPEAR LIKELY TO BEGIN TO DEVELOP TO THE EAST OF THE CENTRAL

APPALACHIANS DURING THE NEXT FEW HOURS...AS INHIBITION CONTINUES TO

WEAKEN WITH DAYTIME HEATING.

IN THE PRESENCE OF MODESTLY SHEARED WESTERLY DEEP LAYER MEAN FLOW ON

THE ORDER OF 30 KT...A GRADUAL INCREASE IN CONVECTIVE INTENSITY AND

ORGANIZATION APPEARS POSSIBLE THROUGH THE AFTERNOON HOURS. STRONGER

ACTIVITY PROBABLY WILL EVENTUALLY BE ACCOMPANIED BY THE RISK FOR AT

LEAST LOCALIZED SURFACE GUSTS THAT COULD APPROACH OR BRIEFLY EXCEED

SEVERE LIMITS. MORE SUBSTANTIVE SEVERE WEATHER POTENTIAL WOULD SEEM

TO HINGE ON CONSOLIDATION OF CONVECTION INTO ONE OR MORE GROWING

CONVECTIVE CLUSTERS. THIS MAY NOT BE OUT OF THE QUESTION...IN

ASSOCIATION WITH FORCING ACCOMPANYING ANY ONE OF A NUMBER OF SUBTLE

PERTURBATIONS APPROACHING OR PROGRESSING ACROSS THE REGION...ON THE

SOUTHERN FRINGE OF THE STRONGER WESTERLIES.

..KERR/CORFIDI.. 06/16/2015

ATTN...WFO...PHI...AKQ...CTP...LWX...RNK...PBZ...RLX...JKL...

ILN...LMK...

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Sky looks really blue. Wonder if there's dry air in the mid levels.

 

.NEAR TERM /THROUGH WEDNESDAY/...

LATEST SURFACE ANALYSIS SHOWED LOW PRESSURE OVER THE ST. LAWRENCE

RIVER VALLEY AND A COLD FRONT DRAPED SOUTHWEST OF IT ACROSS THE

OHIO VALLEY INTO THE CENTRAL PLAINS. THIS FRONT WILL MOVE

SOUTHEAST ACROSS THE AREA THIS EVENING. FORCING ISN`T GREAT WITH

IT ALOFT...AND WESTERLY DOWNSLOPE FLOW HAS TENDED TO INHIBIT

CONVECTION TODAY...BUT THERE ARE SOME LINES OF STORMS APPROACHING

THE REGION FROM SOUTHWESTERN PENNSYLVANIA AND A FEW POP-UPS HAVE

OCCURRED AWAY FROM THE MOUNTAINS SOUTHEAST OF DC. WITH SOME DECENT

AND WELL-ALIGNED WINDS ALOFT...ANY STORM COULD MIX DOWN SOME

STRONG GUSTY WINDS THIS EVENING...BUT THE THREAT WOULD APPEAR TO

DIMINISH BY 8PM OR SO AS THE FRONT SLIDES DOWN AND WE LOSE

INSOLATION.

 

From the afternoon AFD from LWX

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