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June 24-? severe weather discussion


Ian

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Should be getting our MD shortly... good amount of STW's from PBZ and I would assume that is where our storms are coming from later on

It was just issued lol. We just have to hope the stuff out front doesn't much things up (it probably will)

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mcd1285.gif

 

MESOSCALE DISCUSSION 1285
NWS STORM PREDICTION CENTER NORMAN OK
1202 PM CDT FRI JUN 28 2013

AREAS AFFECTED...PORTIONS OH...PA...MD...SERN LOWER
MI...DC...WV...NRN VA...EXTREME SRN PORTIONS WRN NY.

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 281702Z - 281900Z

PROBABILITY OF WATCH ISSUANCE...95 PERCENT

SUMMARY...WW IS REQUIRED FOR PORTIONS SRN PA...MD...NRN VA AND
WV...AND ANOTHER WW IS POSSIBLE ELSEWHERE ACROSS BROADER DISCUSSION
AREA AS TRENDS INDICATE.

DISCUSSION...BROAD AREA OF TSTMS HAS BEEN GRADUALLY BUILDING FROM
SERN LOWER MI EWD ACROSS UPPER OH VALLEY REGION AND INTO N-CENTRAL
APPALACHIANS. INITIALLY WIDELY SCATTERED COVERAGE SHOULD BECOME
MORE DENSE...AND CONVECTION MORE INTENSE...WHILE MOVING INTO
INCREASINGLY UNSTABLE BOUNDARY LAYER. MAIN CONCERN IS DAMAGING
WIND...WITH OCNL HAIL ALSO POSSIBLE.

CONVECTION HAS FORMED IN DECREASINGLY CAPPED AIR MASS...ON BOTH
SIDES OF ILL-DEFINED FRONTAL ZONE EXTENDING SWWD FROM SFC LOW OVER
UPPER HUDSON RIVER REGION. SFC DEW POINTS GENERALLY 60S F...BUT
INCREASING TO NEAR 70 AROUND CHESAPEAKE BAY AND DE VALLEY
REGIONS...COMBINE WITH SFC DIABATIC HEATING OF PRECONVECTIVE AIR
MASS TO YIELD 1000-1500 J/KG MLCAPE IN MODIFIED RAOBS AND FCST
SOUNDINGS. KINEMATIC PROFILES ARE MOSTLY WLY AND NEARLY
UNIDIRECTIONAL...INDICATING PREDOMINANT QUASI-LINEAR EVOLUTION WITH
DAMAGING GUSTS BEING GREATEST CONCERN. DEEP SHEAR INCREASES WITH
SWD EXTENT FROM UPPER GREAT LAKES INTO PORTIONS WV AND NRN VA...WITH
EFFECTIVE SHEAR MAGNITUDES PEAKING AROUND 50 KT OVER LATTER AREAS.
MOST PROBABLE AREA FOR UPSCALE ORGANIZATION/GROWTH APPEARS TO BE ON
NRN FRINGES OF STRONGER SHEAR BELT...WHERE TSTMS HAVE COALESCED
ACROSS PORTIONS SERN OH...NRN WV PANHANDLE AND SWRN PA. ANY SUCH
EVOLUTION WOULD DRIVE FORWARD-PROPAGATING MCS EWD TO ESEWD ASTRIDE
PA/MD BORDER REGION...EVENTUALLY WITH POTENTIAL TO AFFECT CHESAPEAKE
BAY/DE RIVER REGIONS.

..EDWARDS/MEAD.. 06/28/2013


ATTN...WFO...PHI...BGM...BUF...CTP...LWX...PBZ...RLX...CLE...
ILN...DTX...IWX...

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Fail

Next

Given how many watches we've had the last few days I don't see why they don't just include the entire area. It's as good a threat as any day the past few days. Trajectory looks good for us too. Have to wonder if that was ultimately LWX that decided that or SPC. Seems silly to have another watch later that includes a small area from the metro areas to the coast. 

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Given how many watches we've had the last few days I don't see why they don't just include the entire area. It's as good a threat as any day the past few days. Trajectory looks good for us too. Have to wonder if that was ultimately LWX that decided that or SPC. Seems silly to have another watch later that includes a small area from the metro areas to the coast.

Sure well get another east but not sure why they didn't make it bigger. Would be nice if it held till near dark but seems doubtful.
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SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 386

NWS STORM PREDICTION CENTER NORMAN OK

110 PM EDT FRI JUN 28 2013

SEVERE THUNDERSTORM WATCH 386 IS IN EFFECT UNTIL 800 PM EDT

FOR THE FOLLOWING LOCATIONS

MDC001-021-023-043-290000-

/O.NEW.KWNS.SV.A.0386.130628T1710Z-130629T0000Z/

MD

. MARYLAND COUNTIES INCLUDED ARE

ALLEGANY FREDERICK GARRETT

WASHINGTON

$$


SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 386

NWS STORM PREDICTION CENTER NORMAN OK

110 PM EDT FRI JUN 28 2013

SEVERE THUNDERSTORM WATCH 386 IS IN EFFECT UNTIL 800 PM EDT

FOR THE FOLLOWING LOCATIONS

WVC001-003-007-009-013-017-021-023-027-031-033-035-037-041-049-

051-057-061-065-069-071-073-075-077-083-085-087-091-093-095-097-

101-103-105-107-290000-

/O.NEW.KWNS.SV.A.0386.130628T1710Z-130629T0000Z/

WV

. WEST VIRGINIA COUNTIES INCLUDED ARE

BARBOUR BERKELEY BRAXTON

BROOKE CALHOUN DODDRIDGE

GILMER GRANT HAMPSHIRE

HARDY HARRISON JACKSON

JEFFERSON LEWIS MARION

MARSHALL MINERAL MONONGALIA

MORGAN OHIO PENDLETON

PLEASANTS POCAHONTAS PRESTON

RANDOLPH RITCHIE ROANE

TAYLOR TUCKER TYLER

UPSHUR WEBSTER WETZEL

WIRT WOOD

$$

ATTN...WFO...LWX...RLX...PBZ...CTP...


SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 386

NWS STORM PREDICTION CENTER NORMAN OK

110 PM EDT FRI JUN 28 2013

SEVERE THUNDERSTORM WATCH 386 IS IN EFFECT UNTIL 800 PM EDT

FOR THE FOLLOWING LOCATIONS

VAC003-015-043-047-061-069-079-091-107-113-125-137-139-157-165-

171-187-540-660-790-820-840-290000-

/O.NEW.KWNS.SV.A.0386.130628T1710Z-130629T0000Z/

VA

. VIRGINIA COUNTIES INCLUDED ARE

ALBEMARLE AUGUSTA CLARKE

CULPEPER FAUQUIER FREDERICK

GREENE HIGHLAND LOUDOUN

MADISON NELSON ORANGE

PAGE RAPPAHANNOCK ROCKINGHAM

SHENANDOAH WARREN

VIRGINIA INDEPENDENT CITIES INCLUDED ARE

CHARLOTTESVILLE HARRISONBURG STAUNTON

WAYNESBORO WINCHESTER

$$


SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 386

NWS STORM PREDICTION CENTER NORMAN OK

110 PM EDT FRI JUN 28 2013

SEVERE THUNDERSTORM WATCH 386 IS IN EFFECT UNTIL 800 PM EDT

FOR THE FOLLOWING LOCATIONS

PAC001-003-009-013-021-041-051-055-057-059-061-067-087-099-111-

125-129-290000-

/O.NEW.KWNS.SV.A.0386.130628T1710Z-130629T0000Z/

PA

. PENNSYLVANIA COUNTIES INCLUDED ARE

ADAMS ALLEGHENY BEDFORD

BLAIR CAMBRIA CUMBERLAND

FAYETTE FRANKLIN FULTON

GREENE HUNTINGDON JUNIATA

MIFFLIN PERRY SOMERSET

WASHINGTON WESTMORELAND

$$

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Ian!  Supercells!

DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND  INTENSITY ACROSS THE WATCH AREA THIS AFTERNOON AS FORCING FOR ASCENT  IS ENHANCED BY A VORTICITY MAXIMUM PIVOTING AROUND AN UPPER LOW  CENTERED OVER SWRN ONTARIO.  GIVEN THE COMBINATION OF MLCAPE OF  1000-1500 J/KG AND 40-50 KT OF DEEP-LAYER SHEAR...THE SETUP WILL BE  SUPPORTIVE OF SUPERCELLS AND BOWING STRUCTURES CAPABLE OF DAMAGING  WINDS AND SEVERE HAIL.  
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Ian! Supercells!

DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND  
INTENSITY ACROSS THE WATCH AREA THIS AFTERNOON AS FORCING FOR ASCENT  
IS ENHANCED BY A VORTICITY MAXIMUM PIVOTING AROUND AN UPPER LOW  
CENTERED OVER SWRN ONTARIO.  GIVEN THE COMBINATION OF MLCAPE OF  
1000-1500 J/KG AND 40-50 KT OF DEEP-LAYER SHEAR...THE SETUP WILL BE  
SUPPORTIVE OF SUPERCELLS AND BOWING STRUCTURES CAPABLE OF DAMAGING  
WINDS AND SEVERE HAIL.  
#wooshear
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A second Blue Box should be coming out by 3:00 p.m.  probably will be going until 10:00 p.m. for DC/Baltimore metro

 

Super secret NWS/SPC conference call with OEMHS? ;) 

I wonder if they might have done this to word the metro area watch differently for any reason (large event, different threats etc) - Perhaps given that we are in a 30% wind risk they think a more organized wind threat might evolve east of the current STW and thus want to have it be a separate watch. either way...lol

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Super secret NWS/SPC conference call with OEMHS? ;) 

I wonder if they might have done this to word the metro area watch differently for any reason (large event, different threats etc) - Perhaps given that we are in a 30% wind risk they think a more organized wind threat might evolve east of the current STW and thus want to have it be a separate watch. either way...lol

Two reasons come to mind:

 

  1. As you said, higher risk area so the watch probabilities will be tweaked.  My thinking is that higher probabilities for Combined Wind/Hail.
  2. Later arrival of the storms would mean that stretching a watch from Ohio to the Atlantic Ocean isn't really smart.  Two smaller watches will allow for better watch county notification and clearing of counties behind the line.  
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