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Mid-June severe threats


Ian

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Allow me to Yoda.MESOSCALE DISCUSSION 1017   NWS STORM PREDICTION CENTER NORMAN OK   0106 PM CDT SUN JUN 14 2015   AREAS AFFECTED...MUCH OF WRN/SRN PA...CENTRAL/WRN MD...CENTRAL/NRN   VA...DC...NRN WV/PANHANDLE   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE    VALID 141806Z - 141930Z   PROBABILITY OF WATCH ISSUANCE...60 PERCENT   SUMMARY...INCREASING THUNDERSTORM COVERAGE/INTENSITY IS EXPECTED   THROUGH THE REMAINDER OF THIS AFTERNOON WITH A THREAT FOR DAMAGING   WINDS WITH THE STRONGEST STORMS/CLUSTERS. A WATCH IS POSSIBLE FOR   PORTIONS OF THE AREA PRIOR TO 1930Z.   DISCUSSION...A VERY MOIST AIR MASS WAS IN PLACE ACROSS THE   DISCUSSION AREA AT 17Z WITH UPPER 60S/LOWER 70S SURFACE DEW POINTS   AND PW VALUES OF 1.6 OR GREATER.  DESPITE WEAK MID-LEVEL LAPSE   RATES...STRONG DAYTIME HEATING OF THE VERY MOIST AIR MASS HAS   RESULTED IN MLCAPE AVERAGING 1000 TO 1500 J/KG. SCATTERED   THUNDERSTORMS HAVE DEVELOPED WITHIN THE UNCAPPED ENVIRONMENT...AND   COVERAGE IS EXPECTED TO INCREASE THROUGH THE REMAINDER OF THIS   AFTERNOON.   LARGELY UNIDIRECTIONAL FLOW IN THE 2-6 KM LAYER IS AVERAGING 20-30   KTS...STRONGER ACROSS NORTHERN PORTIONS OF THE DISCUSSION AREA...AND   COMBINED WITH THE VERY MOIST AIR MASS WILL RESULT IN A RISK FOR   DAMAGING WINDS WITH SOUTHEAST-MOVING CLUSTERS/SHORT LINE SEGMENTS   THROUGH THIS AFTERNOON. ALTHOUGH LOW-MID LEVEL FLOW IS WEAKER   FARTHER SOUTH ACROSS CENTRAL/NORTHERN VIRGINIA...STEEP LOW-LEVEL   LAPSE RATES IN COMBINATION WITH THE HIGH PW ENVIRONMENT WILL ALSO   PROMOTE A RISK OF DAMAGING DOWNBURST WINDS WITH THE STRONGEST   STORMS.    TRENDS IN THUNDERSTORM COVERAGE/INTENSITY WILL BE MONITORED FOR THE   POSSIBILITY OF A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF THE AREA   PRIOR TO 1930Z.   ..BUNTING/CORFIDI.. 06/14/2015

http://www.spc.noaa.gov/products/md/md1017.html

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AT 404 PM EDT...A STRONG THUNDERSTORM WAS NEAR POINT OF ROCKS...OR
NEAR POOLESVILLE...MOVING EAST AT 25 MPH.

WINDS IN EXCESS OF 30 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
ROCKVILLE...GAITHERSBURG...POOLESVILLE...GERMANTOWN...DAMASCUS...
NORTH POTOMAC...MONTGOMERY VILLAGE...BOYDS...REDLAND...WASHINGTON
GROVE...LAYTONSVILLE...BARNESVILLE...DICKERSON...TUSCARORA...
BEALLSVILLE...CLARKSBURG...DAWSONVILLE...LUCKETTS...DERWOOD AND
DARNESTOWN.

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AT 404 PM EDT...A STRONG THUNDERSTORM WAS NEAR POINT OF ROCKS...OR

NEAR POOLESVILLE...MOVING EAST AT 25 MPH.

WINDS IN EXCESS OF 30 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THIS

STORM.

LOCATIONS IMPACTED INCLUDE...

ROCKVILLE...GAITHERSBURG...POOLESVILLE...GERMANTOWN...DAMASCUS...

NORTH POTOMAC...MONTGOMERY VILLAGE...BOYDS...REDLAND...WASHINGTON

GROVE...LAYTONSVILLE...BARNESVILLE...DICKERSON...TUSCARORA...

BEALLSVILLE...CLARKSBURG...DAWSONVILLE...LUCKETTS...DERWOOD AND

DARNESTOWN.

Wow!

I hope there were no tragedies from those 30 mph winds a pea size hail. Prayers.

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Early morning action :lol:

 

 

BULLETIN - IMMEDIATE BROADCAST REQUESTED  
SEVERE THUNDERSTORM WARNING  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
127 AM EDT MON JUN 15 2015  
 
THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A  
 
* SEVERE THUNDERSTORM WARNING FOR...  
NORTHWESTERN FREDERICK COUNTY IN NORTH CENTRAL MARYLAND...  
NORTHEASTERN WASHINGTON COUNTY IN NORTH CENTRAL MARYLAND...  
 
* UNTIL 200 AM EDT  
 
* AT 127 AM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE  
THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60  
MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM NEAR  
GREENCASTLE TO NEAR FOUNTAINHEAD-ORCHARD HILLS TO NEAR  
WILSON-CONOCOCHEAGUE...AND MOVING SOUTHEAST AT 35 MPH.  
 
* LOCATIONS IMPACTED INCLUDE...  
HAGERSTOWN...MUNICIPAL STADIUM...SMITHSBURG...LONG MEADOW...  
FOUNTAINHEAD-ORCHARD HILLS...WILSON-CONOCOCHEAGUE...MOUNT AETNA...  
WOLFSVILLE...ROBINWOOD...PARAMOUNT-LONG MEADOW...MOUNT LENA...SAN  
MAR...FUNKSTOWN...MAUGANSVILLE...HIGHFIELD...CAVETOWN...RINGGOLD...  
FORT RITCHIE...WARRENTON AND LEITERSBURG.  

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Pity morning MD

 

 

MESOSCALE DISCUSSION 1025  
NWS STORM PREDICTION CENTER NORMAN OK  
0102 AM CDT MON JUN 15 2015  
 
AREAS AFFECTED...PORTIONS OF MD...NRN VA...ERN WV PANHANDLE  
 
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY  

 
VALID 150602Z - 150800Z  

 
PROBABILITY OF WATCH ISSUANCE...5 PERCENT  
 
SUMMARY...THUNDERSTORMS WILL CONTINUE ADVANCING ESEWD ACROSS PARTS  
OF MD AND INTO NRN VA AND THE ERN WV PANHANDLE DURING THE NEXT FEW  
HOURS AND MAY POSE A RISK FOR LOCALLY STRONG WIND GUSTS.  
 
DISCUSSION...WITH A RELATIVELY MOIST BOUNDARY LAYER IN PLACE  
CHARACTERIZED BY LOWER-70S SFC DEWPOINTS...NOCTURNAL COOLING HAS  
BEEN RELATIVELY LIMITED -- SUPPORTING AT LEAST MARGINAL INSTABILITY  
S OF LINGERING DIURNAL CONVECTION SPREADING ESEWD FROM S-CNTRL PA.  
THE LWX VWP SAMPLES AROUND 30-35 KT OF DEEP SHEAR THAT MAY MAINTAIN  
OCCASIONALLY ORGANIZED...FORWARD-PROPAGATING MULTICELL CLUSTERS.  
SPORADIC STRONG WIND GUSTS MAY OCCUR...AND AN ISOLATED DMGG WIND  
GUST CANNOT BE RULED OUT IN ASSOCIATION WITH MESO-GAMMA-SCALE  
CIRCULATIONS RELATED TO SUSTAINED CONVECTION -- E.G. THAT WHICH IS  
CROSSING INTO FREDERICK COUNTY MD. SUCH ACTIVITY SHOULD CONTINUE TO  
SPREAD ESEWD THROUGH THE OVERNIGHT HOURS...BUT MAY EVENTUALLY WEAKEN  
AS MODEST NOCTURNAL COOLING AND STABILIZATION CONTINUE. ONLY MODEST  
LOW/MID-LEVEL LAPSE RATES SAMPLED BY THE IAD 00Z RAOB AND ASSOCIATED  
WEAK DCAPE...ALONG WITH THE LACK OF STRONGER LOW-LEVEL FLOW...SHOULD  
MITIGATE A GREATER SVR-TSTM RISK.  
 
..COHEN/DIAL.. 06/15/2015  

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